First commit of partly-working reflow oven controller.

10 years ago · aaaec8ff40
43 changed files with 3010 additions and 0 deletions
--- a/.mtn-ignore
+++ b/.mtn-ignore
@ -0,0 +1,4 @@
+\.o$
+\.hex$
+\.elf$
+\.elf.map$
--- a/67
+++ b/67
@ -0,0 +1,67 @@
+# Makefile
+
+DEVICE     = attiny88
+CLOCK      = 4000000
+PROGRAMMER = -c buspirate -P /dev/ttyUSB0
+OBJECTS    = reflow.o display.o font.o i2c.o menu.o spi.o therm.o timer.o config.o beep.o control.o fields.o profile.o
+SRC        = $(OBJECTS:%.o=%.c)
+#FUSES      = -U lfuse:w:0xEC:m -U hfuse:w:0xDF:m -U efuse:w:0xFF:m -U lock:w:0xFF:m
+FUSES      = -U lfuse:w:0xEC:m -U hfuse:w:0xDF:m -U efuse:w:0x07:m
+
+# For computing fuse byte values for other devices and options see
+# the fuse bit calculator at http://www.engbedded.com/fusecalc/
+
+#AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)
+AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE) -V
+# Don't use -Werror in the link stage to avoid a compiler bug which is fixed in gcc 4.8.3
+CFLAGS = -Werror
+COMPILE = avr-gcc -std=c99 -Wall -Wl,-Map,$@.map -Os -g -DF_CPU=$(CLOCK) -mmcu=$(DEVICE) -mcall-prologues -flto -fuse-linker-plugin
+
+# symbolic targets:
+all:	reflow.hex
+
+.c.o:
+	$(COMPILE) $(CFLAGS) -c $< -o $@
+
+.S.o:
+	$(COMPILE) -x assembler-with-cpp -c $< -o $@
+
+.c.s:
+	$(COMPILE) $(CFLAGS) -S $< -o $@
+
+flash:
+	$(AVRDUDE) -U flash:w:reflow.hex:i
+
+fuse:
+	$(AVRDUDE) $(FUSES)
+
+install: all flash fuse
+
+# if you use a bootloader, change the command below appropriately:
+load: all
+	bootloadHID reflow.hex
+
+clean:
+	rm -f reflow.hex reflow.elf $(OBJECTS)
+
+# file targets:
+#reflow.elf: $(SRC)
+#	$(COMPILE) $(LDFLAGS) -o reflow.elf $(SRC)
+
+reflow.elf: $(OBJECTS)
+	$(COMPILE) $(LDFLAGS) -o reflow.elf $(OBJECTS)
+
+reflow.hex: reflow.elf
+	rm -f reflow.hex
+	avr-objcopy -j .text -j .data -O ihex reflow.elf reflow.hex
+	avr-size --format=avr --mcu=$(DEVICE) reflow.elf
+# If you have an EEPROM section, you must also create a hex file for the
+# EEPROM and add it to the "flash" target.
+
+# Targets for code debugging and analysis:
+disasm:	reflow.elf
+	avr-objdump -d reflow.elf
+
+cpp:
+	$(COMPILE) -E reflow.c
+
--- a/beep.c
+++ b/beep.c
@ -0,0 +1,24 @@
+/* beep.c */
+
+#include <avr/io.h>
+
+#include "common.h"
+
+#define DDR_BEEP DDRB
+#define PORT_BEEP PORTB
+
+#define PIN_BEEP 1
+
+void beep_on(void)
+{
+    TIMSK1 = 0;
+    TCCR1A = (1<<COM1A0);
+    TCCR1B = (1<<CS10) | (1<<WGM12); /* clkIO / 1, CTC mode */
+    DDR_BEEP |= (1<<PIN_BEEP);
+    OCR1A = 1000;
+}
+
+void beep_off(void)
+{
+    DDR_BEEP &= ~(1<<PIN_BEEP);
+}
--- a/beep.h
+++ b/beep.h
@ -0,0 +1,9 @@
+/* beep.h */
+
+#ifndef _BEEP_H_
+#define _BEEP_H_
+
+void beep_on(void);
+void beep_off(void);
+
+#endif
--- a/button.c
+++ b/button.c
@ -0,0 +1,33 @@
+/* button.c */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "common.h"
+
+uint8_t bounce_timer;
+uint8_t button;
+
+#define BOUNCE_TIMER_RESET 10
+
+void button_init(void)
+{
+    bounce_timer = 0;
+    button = 0;
+}
+
+ISR(TIMER2_vect)
+{
+    uint8_t port = PORTD;
+    uint8_t old_button;
+    port = (~port >> 4);
+    if (bounce_timer)
+	bounce_timer--;
+    else
+	if (port)
+	    button = 1 + ctz(port);
+	else
+	    button = 0;
+
+    if (button != old_button)
+	bounce_timer = BOUNCE_TIMER_RESET;
+}
--- a/button.h
+++ b/button.h
@ -0,0 +1,8 @@
+/* button.h */
+
+#ifndef _BUTTON_H_
+#define _BUTTON_H_
+
+extern uint8 button;
+
+#endif
--- a/common.h
+++ b/common.h
@ -0,0 +1,11 @@
+/* common.h */
+
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
+#include <inttypes.h>
+#include "types.h"
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+#endif
--- a/config.c
+++ b/config.c
@ -0,0 +1,15 @@
+/* config.c */
+
+#include "config.h"
+
+config_t config = {
+    127,
+    1, /* beep */
+    3, /* thermocouple */
+    0, /* frequency */
+    0, /* units */
+    0x080,
+    0x040,
+    0xfc0
+};
+
--- a/config.h
+++ b/config.h
@ -0,0 +1,25 @@
+/* config.h */
+
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#include "common.h"
+
+/* So there's a total of 64 bytes of EEPROM.
+ * This is going to be a squeeze. Unless we can
+ * program the profiles into program flash or something.
+ */
+typedef struct config {
+    uint8_t contrast;
+    unsigned int beep:1;
+    unsigned int thermocouple_type:3;
+    unsigned int frequency:1;
+    unsigned int units:4;
+    signed int p:12;
+    signed int i:12;
+    signed int d:12;
+} config_t;
+
+extern config_t config;
+
+#endif
--- a/control.c
+++ b/control.c
@ -0,0 +1,122 @@
+/* control.c */
+
+#include <util/atomic.h>
+
+#include "common.h"
+#include "timer.h"
+#include "config.h"
+#include "therm.h"
+#include "beep.h"
+
+static temp_t last_temp;
+static volatile bool preheat;
+static bool control_running;
+static uint32_t control_start_time;
+static int16_t integral;
+static int16_t control_output;
+
+temp_t temperature_at_time(uint32_t time);
+
+int16_t __attribute__ ((noinline)) clip16(int16_t val, int16_t min, int16_t max)
+{
+    if (val < min)
+	val = min;
+    if (val > max)
+	val = max;
+    return val;
+}
+
+uint32_t control_now(void)
+{
+    uint32_t this_seconds;
+
+    ATOMIC_BLOCK(ATOMIC_FORCEON) {
+	this_seconds = seconds;
+    }
+
+    if (preheat)
+	control_start_time = this_seconds;
+    return this_seconds - control_start_time;
+}
+
+void control_start(void)
+{
+    preheat = TRUE;
+    last_temp = therm_temp();
+    integral = 0;
+    control_running = TRUE;
+    control_output = 0;
+}
+
+#define TIME_UNIT 1
+#define INTEGRAL_MAX (CONTROL_MAX * 2)
+#define INTEGRAL_MIN (-(INTEGRAL_MAX))
+
+#define CONTROL_MAX (10 * 128)
+#define CONTROL_MIN (0)
+
+/* P = 1.00 means 1 degree C leads to full-scale output
+ * This is represented by config.p == 128
+ * The calculations done here are in units of 0.1 degrees
+ */
+
+#define ABS(x) ((x) < 0 ? -(x) : (x))
+#define INT_MAX 32767
+#define INT_MIN (-32768)
+
+#if 0
+int16_t multiply_clip(int16_t a, int16_t b)
+{
+    if ((b == 0) || (ABS(a) > INT_MAX / ABS(b)))
+	return ((a < 0) ^ (b < 0)) ? INT_MIN : INT_MAX;
+    return a * b;
+}
+#endif
+
+void control_poll(void)
+{
+    temp_t temp = therm_temp();
+    temp_t profile_temp;
+    int16_t error;
+    int16_t temp_diff = temp - last_temp;
+    int16_t maxgain;
+    int16_t p, i, d;
+
+    last_temp = temp;
+
+    if (!control_running)
+	return;
+
+    profile_temp = temperature_at_time(control_now());
+    if (profile_temp == INVALID_TEMPERATURE) {
+	control_running = FALSE;
+	output0 = 0;
+	beep_off();
+	return;
+    }
+
+    error = (int16_t)(profile_temp - temp);
+
+    if (error <= 0) {
+	beep_on();
+	preheat = FALSE;
+    } else {
+	beep_off();
+    }
+
+    maxgain = (error == 0) ? INT_MAX : ((2*CONTROL_MAX) / error);
+    maxgain = ABS(maxgain);
+
+    p = clip16(config.p, -maxgain, maxgain);
+    i = clip16(config.i, -maxgain, maxgain);
+    d = clip16(config.d, -maxgain, maxgain);
+
+    integral += i * error * TIME_UNIT;
+    integral = clip16(integral, INTEGRAL_MIN, INTEGRAL_MAX);
+
+    control_output += p * error + integral + d * temp_diff / TIME_UNIT;
+    control_output = clip16(control_output, CONTROL_MIN, CONTROL_MAX);
+
+    output0 = (TIMER_MAX/5) * control_output / (CONTROL_MAX/5);
+}
+
--- a/control.h
+++ b/control.h
@ -0,0 +1,12 @@
+/* control.h */
+
+#ifndef _CONTROL_H_
+#define _CONTROL_H_
+
+#include "common.h"
+
+void control_start(void);
+void control_poll(void);
+uint32_t control_now(void);
+
+#endif
--- a/display.c
+++ b/display.c
@ -0,0 +1,140 @@
+/* display.c */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+
+#include "common.h"
+#include "i2c.h"
+#include "font.h"
+
+#define ADDRESS 0x3c
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+#define HORIZONTAL_FLIP 0
+#define VERTICAL_FLIP 0
+
+#define COM_ALT 1
+#define COM_LR_REMAP 0
+
+#define DISPLAY_INVERT 0
+
+#define DEFAULT_CONTRAST 0x7f
+
+/* Init sequence from SSD1306 datasheet */
+const uint8 display_init_seq[] = {
+	0xa8, 0x3f, /* Multiplex ratio */
+	0xd3, 0x00, /* Display offset */
+	0x40, /* Display start line */
+	0xa0 | HORIZONTAL_FLIP,
+	0xc0 | (VERTICAL_FLIP << 3),
+	0xda, 0x02 | (COM_ALT << 4) | (COM_LR_REMAP << 5),
+	0x81, DEFAULT_CONTRAST,
+	0xa4, /* Disable entire display on */
+	0xa6 | DISPLAY_INVERT,
+	0xd5, 0x80, /* clock divide ratio */
+	0x8d, 0x14, /* charge pump setting */
+	0xaf  /* display on */
+};
+
+uint8 curpos;
+
+#if 0
+void delay(uint8_t count)
+{
+    volatile uint8_t i;
+
+    while (count--)
+	for (i = 255; i; i--)
+	    ;
+}
+#endif
+
+void display_command(uint8_t command)
+{
+    i2c_set_xor(0);
+    i2c_write(ADDRESS, 0x80, 1, &command);
+}
+
+void display_init(void)
+{
+    uint8 i;
+
+    i2c_init();
+
+    for (i = 0; i < ARRAY_SIZE(display_init_seq); i++)
+	display_command(display_init_seq[i]);
+
+    curpos = 0;
+}
+
+void display_data(uint8_t len, uint8_t *data)
+{
+    i2c_write(ADDRESS, 0x40, len, data);
+    curpos += len;
+#if 0
+    /* This bit is only needed if you are relying on wraparound. */
+    if (curpos > 127)
+	curpos -= 128;
+#endif
+    //delay(255);
+}
+
+/* col = graphics column, row = text rows
+ * 0-127                  0-7
+ */
+void display_setposition(uint8_t col, uint8_t row)
+{
+    display_command(0xb0 + (row & 0x0f));
+    display_command(0x00 + (col & 0x0f));
+    display_command(0x10 + ((col >> 4) & 0x0f));
+    curpos = col;
+}
+
+void display_setinverse(bool on)
+{
+    i2c_set_xor(on ? 0xff : 0);
+}
+
+void display_putchar(char c)
+{
+    uint8_t *data = font_getchar(c);
+    display_data(6, data);
+}
+
+void display_putstr(char *s)
+{
+    while (*s)
+	display_putchar(*(s++));
+}
+
+void display_putstr_P(const char *s)
+{
+    char c;
+    while ((c = pgm_read_byte(s++)) != '\0')
+	display_putchar(c);
+}
+
+#ifdef FAST_CLEAR
+const uint8_t zero_data[] = {0, 0, 0, 0, 0, 0, 0, 0};
+#endif
+
+void display_clearline(void)
+{
+    uint8_t remaining = 128 - curpos;
+
+#ifdef FAST_CLEAR
+    while (remaining) {
+	uint8_t todo = remaining;
+	if (todo > sizeof(zero_data))
+	    todo = sizeof(zero_data);
+	display_data(todo, (uint8_t *)zero_data);
+	remaining -= todo;
+    }
+#else
+    uint8_t zero = 0;
+
+    while (remaining--)
+	display_data(1, &zero);
+#endif
+}
--- a/display.h
+++ b/display.h
@ -0,0 +1,18 @@
+/* display.h */
+
+#ifndef _DISPLAY_H_
+#define _DISPLAY_H_
+
+#include "common.h"
+
+void display_init(void);
+void display_data(uint8_t len, uint8_t *data);
+void display_setposition(uint8_t col, uint8_t row);
+#define display_settextpos(col, row) display_setposition((col)*6, row)
+void display_setinverse(bool on);
+void display_putchar(char c);
+void display_putstr(char *s);
+void display_putstr_P(const char *s);
+void display_clearline(void);
+
+#endif
--- a/fields.c
+++ b/fields.c
@ -0,0 +1,268 @@
+/* fields.c */
+
+#include <stddef.h>
+#include <string.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+
+#include "common.h"
+#include "fields.h"
+#include "menu.h"
+#include "config.h"
+
+uint8_t field_row; // XXX ?
+uint8_t field_values[DISPLAY_CHARS];
+
+static uint8_t field_index(char c)
+{
+    return ((uint8_t)(c) & (uint8_t)15)-1;
+}
+//#define field(c) fields[((uint8_t)(c) & (uint8_t)15)-1]
+#define field(c) fields[field_index(c)]
+
+uint8_t field_length(char c)
+{
+    return field(c).length;
+}
+
+bool field_is_text(char c)
+{
+    return field(c).display == NULL;
+}
+
+PGM_P field_text(char c, uint8_t n)
+{
+    return get_string(&field(c).display[n]);
+}
+
+uint8_t field_display_entries(char c)
+{
+    return field(c).display_entries;
+}
+
+bool is_field(char c) {
+    return (c > 0) && (c < 32);
+}
+
+bool is_editable(char c) {
+    return (c > 16) && (c < 32);
+}
+
+PGM_P get_string(PGM_P const *addr)
+{
+    PGM_P ptr;
+    memcpy_P(&ptr, addr, sizeof(PGM_P));
+    return ptr;
+}
+
+uint8_t find_field(uint8_t n)
+{
+    char c;
+    uint8_t index = 0;
+    char type = 0;
+
+    while ((c = menu_getchar(index)) != '\0') {
+	index++;
+	if (type && (type == c))
+	    continue;
+	if (is_field(c)) {
+	    type = c;
+	    if (n == 0)
+		return index-1;
+	    n--;
+	} else {
+	    type = 0;
+	}
+    }
+    return 255;
+}
+
+uint8_t find_field_length_by_place(uint8_t index)
+{
+    uint8_t orig_index = index;
+    char type = menu_getchar(index);
+    uint8_t tlen = field_length(type);
+
+    while (menu_getchar(index) == type)
+	index += tlen;
+
+    return index - orig_index;
+}
+
+uint8_t find_field_length(uint8_t index)
+{
+    return find_field_length_by_place(find_field(index));
+}
+
+uint8_t find_field_number(uint8_t index)
+{
+    uint8_t n, p;
+    for (n = 0; (p = find_field(n)) != 255; n++)
+    {
+	if (p == index)
+	    return n;
+    }
+    return 255;
+}
+
+uint8_t find_editable_field(uint8_t index, bool left)
+{
+    int8_t increment = left?(-1):1;
+    char c;
+    uint8_t len;
+
+    if (index >= 255)
+	return 255;
+
+    len = strlen_P(get_string(&menu_current_p->text[field_row]));
+
+    if (left && (index >= len))
+	index = len-1;
+
+    while ((c = menu_getchar(index)) != '\0') {
+	if (is_editable(c))
+	    return index;
+	index += increment;
+    }
+    return 255;
+}
+
+void write_field_enum(uint8_t field, uint8_t val)
+{
+    uint8_t p = find_field(field);
+    field_values[p] = val;
+}
+
+uint8_t read_field_enum(uint8_t field)
+{
+    uint8_t p = find_field(field);
+    return field_values[p];
+}
+
+uint16_t read_field_uint16(uint8_t field)
+{
+    uint8_t i;
+    uint16_t val = 0;
+
+    uint8_t p = find_field(field);
+    uint8_t l = find_field_length(field);
+
+    for (i = 0; i < l; i++) {
+	val = val * 10;
+	val += field_values[p+i];
+    }
+
+    return val;
+}
+
+void write_field_uint16(uint8_t field, uint16_t val)
+{
+    uint8_t i;
+
+    uint8_t p = find_field(field);
+    uint8_t l = find_field_length(field);
+
+    for (i = l; i; i--) {
+	field_values[p+i-1] = val % 10;
+	val = val / 10;
+    }
+}
+
+void write_field_integer_part(uint8_t field, int32_t val)
+{
+    if (val < 0)
+	val = -val;
+
+    write_field_uint16(field, val >> 12);
+}
+
+void write_field_fractional_part(uint8_t field, int32_t val)
+{
+    uint8_t i;
+    uint16_t v;
+
+    uint8_t p = find_field(field);
+    uint8_t l = find_field_length(field);
+
+    if (val < 0)
+	val = -val;
+
+    v = val & 0xfff;
+
+    for (i = 0; i < l; i++) {
+	uint8_t digit;
+	v = v * 10;
+	digit = (v >> 12) % 10;
+	v = v - (digit << 12);
+	field_values[p+i] = digit;
+    }
+}
+
+int32_t round_dp(int32_t n, uint8_t dp)
+{
+    int32_t rval = 0x800;
+    int i;
+
+    /* Round away from zero. Remove this bit
+     * to round up
+     */
+    if (n < 0)
+	rval = -rval;
+
+    for (i = 0; i < dp; i++)
+	rval = rval / 10;
+
+    return n + rval;
+}
+
+uint32_t read_field_fracint(int8_t index, bool frac)
+{
+    int32_t val, v_int, v_frac;
+    uint8_t sign = read_field_enum(index++);
+
+    v_int = read_field_uint16(index++);
+
+    if (frac) {
+	uint8_t l_frac;
+	v_frac = read_field_uint16(index);
+	l_frac = find_field_length(index);
+
+	v_frac = v_frac << 12;
+	while (l_frac--)
+	    v_frac = v_frac / 10;
+    } else {
+        v_frac = 0;
+    }
+
+    val = (v_int << 12) + v_frac;
+
+    if (sign == FIELD_SIGN_NEGATIVE)
+	val = -val;
+
+    return val;
+}
+
+void write_field_fracint(uint8_t index, bool sign, bool frac, int32_t val)
+{
+    uint8_t l_frac;
+
+    l_frac = find_field_length(index+1+(sign?1:0));
+
+    val = round_dp(val, frac?l_frac:0);
+
+    if (sign)
+	write_field_enum(index++, (val<0)?FIELD_SIGN_NEGATIVE:FIELD_SIGN_POSITIVE);
+
+    write_field_integer_part(index++, val);
+    if (frac)
+	write_field_fractional_part(index, val);
+}
+
+
+void write_field_temperature(uint8_t index, bool frac, temp_t k_temp)
+{
+    int32_t temp = temperature_from_kelvin(k_temp);
+    write_field_fracint(index, TRUE, frac, temp);
+    write_field_enum(index+2+(frac?1:0), config.units);
+}
+
--- a/fields.h
+++ b/fields.h
@ -0,0 +1,53 @@
+/* fields.h */
+
+#ifndef _FIELDS_H_
+#define _FIELDS_H_
+
+#include "common.h"
+#include "avr/pgmspace.h"
+
+#define DISPLAY_CHARS 21
+
+extern uint8_t field_values[DISPLAY_CHARS];
+
+typedef struct field {
+    PGM_P const *display;
+    uint8_t display_entries;
+    uint8_t length;
+} field_t;
+
+//#define field(c) fields[((uint8_t)(c) & (uint8_t)15)-1]
+
+//#define field_length(c) (field(c).length)
+
+#define FIELD_SIGN_NEGATIVE 0
+#define FIELD_SIGN_POSITIVE 1
+
+uint8_t field_length(char c);
+bool field_is_text(char c);
+PGM_P field_text(char c, uint8_t n);
+uint8_t field_display_entries(char c);
+bool is_field(char c);
+bool is_editable(char c);
+PGM_P get_string(PGM_P const *addr);
+uint8_t find_field(uint8_t n);
+uint8_t find_field_length_by_place(uint8_t index);
+uint8_t find_field_length(uint8_t index);
+uint8_t find_field_number(uint8_t index);
+uint8_t find_editable_field(uint8_t index, bool left);
+void write_field_enum(uint8_t field, uint8_t val);
+uint8_t read_field_enum(uint8_t field);
+uint16_t read_field_uint16(uint8_t field);
+void write_field_uint16(uint8_t field, uint16_t val);
+
+#define read_field_uint8(x) read_field_uint16(x)
+#define write_field_uint8(x, y) write_field_uint16(x, y)
+
+void write_field_integer_part(uint8_t field, int32_t val);
+void write_field_fractional_part(uint8_t field, int32_t val);
+int32_t round_dp(int32_t n, uint8_t dp);
+uint32_t read_field_fracint(int8_t index, bool frac);
+void write_field_fracint(uint8_t index, bool sign, bool frac, int32_t val);
+void write_field_temperature(uint8_t index, bool frac, temp_t k_temp);
+
+#endif
--- a/font.c
+++ b/font.c
@ -0,0 +1,123 @@
+/* font.c */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+
+#include "common.h"
+
+// standard ascii 5x7 font
+// defines ascii characters 0x20-0x7F (32-127)
+static const uint8_t PROGMEM font[] = {
+	0x00, 0x00, 0x00, 0x00, 0x00,// (space)
+	0x00, 0x00, 0x5F, 0x00, 0x00,// !
+	0x00, 0x07, 0x00, 0x07, 0x00,// "
+	0x14, 0x7F, 0x14, 0x7F, 0x14,// #
+	0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
+	0x23, 0x13, 0x08, 0x64, 0x62,// %
+	0x36, 0x49, 0x55, 0x22, 0x50,// &
+	0x00, 0x05, 0x03, 0x00, 0x00,// '
+	0x00, 0x1C, 0x22, 0x41, 0x00,// (
+	0x00, 0x41, 0x22, 0x1C, 0x00,// )
+	0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
+	0x08, 0x08, 0x3E, 0x08, 0x08,// +
+	0x00, 0x50, 0x30, 0x00, 0x00,// ,
+	0x08, 0x08, 0x08, 0x08, 0x08,// -
+	0x00, 0x60, 0x60, 0x00, 0x00,// .
+	0x20, 0x10, 0x08, 0x04, 0x02,// /
+	0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
+	0x00, 0x42, 0x7F, 0x40, 0x00,// 1
+	0x42, 0x61, 0x51, 0x49, 0x46,// 2
+	0x21, 0x41, 0x45, 0x4B, 0x31,// 3
+	0x18, 0x14, 0x12, 0x7F, 0x10,// 4
+	0x27, 0x45, 0x45, 0x45, 0x39,// 5
+	0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
+	0x01, 0x71, 0x09, 0x05, 0x03,// 7
+	0x36, 0x49, 0x49, 0x49, 0x36,// 8
+	0x06, 0x49, 0x49, 0x29, 0x1E,// 9
+	0x00, 0x36, 0x36, 0x00, 0x00,// :
+	0x00, 0x56, 0x36, 0x00, 0x00,// ;
+	0x00, 0x08, 0x14, 0x22, 0x41,// <
+	0x14, 0x14, 0x14, 0x14, 0x14,// =
+	0x41, 0x22, 0x14, 0x08, 0x00,// >
+	0x02, 0x01, 0x51, 0x09, 0x06,// ?
+	0x32, 0x49, 0x79, 0x41, 0x3E,// @
+	0x7E, 0x11, 0x11, 0x11, 0x7E,// A
+	0x7F, 0x49, 0x49, 0x49, 0x36,// B
+	0x3E, 0x41, 0x41, 0x41, 0x22,// C
+	0x7F, 0x41, 0x41, 0x22, 0x1C,// D
+	0x7F, 0x49, 0x49, 0x49, 0x41,// E
+	0x7F, 0x09, 0x09, 0x01, 0x01,// F
+	0x3E, 0x41, 0x41, 0x51, 0x32,// G
+	0x7F, 0x08, 0x08, 0x08, 0x7F,// H
+	0x00, 0x41, 0x7F, 0x41, 0x00,// I
+	0x20, 0x40, 0x41, 0x3F, 0x01,// J
+	0x7F, 0x08, 0x14, 0x22, 0x41,// K
+	0x7F, 0x40, 0x40, 0x40, 0x40,// L
+	0x7F, 0x02, 0x04, 0x02, 0x7F,// M
+	0x7F, 0x04, 0x08, 0x10, 0x7F,// N
+	0x3E, 0x41, 0x41, 0x41, 0x3E,// O
+	0x7F, 0x09, 0x09, 0x09, 0x06,// P
+	0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
+	0x7F, 0x09, 0x19, 0x29, 0x46,// R
+	0x46, 0x49, 0x49, 0x49, 0x31,// S
+	0x01, 0x01, 0x7F, 0x01, 0x01,// T
+	0x3F, 0x40, 0x40, 0x40, 0x3F,// U
+	0x1F, 0x20, 0x40, 0x20, 0x1F,// V
+	0x7F, 0x20, 0x18, 0x20, 0x7F,// W
+	0x63, 0x14, 0x08, 0x14, 0x63,// X
+	0x03, 0x04, 0x78, 0x04, 0x03,// Y
+	0x61, 0x51, 0x49, 0x45, 0x43,// Z
+	0x00, 0x00, 0x7F, 0x41, 0x41,// [
+	0x02, 0x04, 0x08, 0x10, 0x20,// "\"
+	0x41, 0x41, 0x7F, 0x00, 0x00,// ]
+	0x04, 0x02, 0x01, 0x02, 0x04,// ^
+	0x40, 0x40, 0x40, 0x40, 0x40,// _
+	0x00, 0x01, 0x02, 0x04, 0x00,// `
+	0x20, 0x54, 0x54, 0x54, 0x78,// a
+	0x7F, 0x48, 0x44, 0x44, 0x38,// b
+	0x38, 0x44, 0x44, 0x44, 0x20,// c
+	0x38, 0x44, 0x44, 0x48, 0x7F,// d
+	0x38, 0x54, 0x54, 0x54, 0x18,// e
+	0x08, 0x7E, 0x09, 0x01, 0x02,// f
+	0x08, 0x14, 0x54, 0x54, 0x3C,// g
+	0x7F, 0x08, 0x04, 0x04, 0x78,// h
+	0x00, 0x44, 0x7D, 0x40, 0x00,// i
+	0x20, 0x40, 0x44, 0x3D, 0x00,// j
+	0x00, 0x7F, 0x10, 0x28, 0x44,// k
+	0x00, 0x41, 0x7F, 0x40, 0x00,// l
+	0x7C, 0x04, 0x18, 0x04, 0x78,// m
+	0x7C, 0x08, 0x04, 0x04, 0x78,// n
+	0x38, 0x44, 0x44, 0x44, 0x38,// o
+	0x7C, 0x14, 0x14, 0x14, 0x08,// p
+	0x08, 0x14, 0x14, 0x18, 0x7C,// q
+	0x7C, 0x08, 0x04, 0x04, 0x08,// r
+	0x48, 0x54, 0x54, 0x54, 0x20,// s
+	0x04, 0x3F, 0x44, 0x40, 0x20,// t
+	0x3C, 0x40, 0x40, 0x20, 0x7C,// u
+	0x1C, 0x20, 0x40, 0x20, 0x1C,// v
+	0x3C, 0x40, 0x30, 0x40, 0x3C,// w
+	0x44, 0x28, 0x10, 0x28, 0x44,// x
+	0x0C, 0x50, 0x50, 0x50, 0x3C,// y
+	0x44, 0x64, 0x54, 0x4C, 0x44,// z
+	0x00, 0x08, 0x36, 0x41, 0x00,// {
+	0x00, 0x00, 0x7F, 0x00, 0x00,// |
+	0x00, 0x41, 0x36, 0x08, 0x00,// }
+	0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
+	0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
+};
+
+uint8_t font_char[6];
+
+uint8_t *font_getchar(char ch)
+{
+    uint8_t c = ch - 32;
+
+    if (c > (127-32))
+	c = 0;
+
+    memcpy_P(font_char, font+5*c, 5);
+
+    font_char[5] = 0;
+
+    return font_char;
+}
--- a/font.h
+++ b/font.h
@ -0,0 +1,8 @@
+/* font.h */
+
+#ifndef _FONT_H_
+#define _FONT_H_
+
+uint8_t *font_getchar(char c);
+
+#endif
--- a/humancontrol/Makefile
+++ b/humancontrol/Makefile
@ -0,0 +1,3 @@
+# Makefile
+
+soldertimer: soldertimer.c
--- a/humancontrol/soldertimer.c
+++ b/humancontrol/soldertimer.c
@ -0,0 +1,115 @@
+/* soldertimer.c */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include <stddef.h>
+#include <string.h>
+#include <time.h>
+
+
+typedef struct profile_line {
+    int32_t temperature; /* store degrees C * 4096 */
+    unsigned int time;
+} profile_line_t;
+
+typedef struct profile {
+    char name[21];
+    int32_t start_temp;
+    profile_line_t lines[6];
+} profile_t;
+
+#define DEGREES * 4096
+
+profile_t profile = {"Lead-free solder", 25 DEGREES, {
+	{ 150 DEGREES, 100 },
+	{ 200 DEGREES, 100 },
+	{ 250 DEGREES,  40 },
+	{ 250 DEGREES,  30 },
+	{ 100 DEGREES,  30 },
+	{ 0, 0 } }
+    };
+
+static int32_t expand_profile_temperature(uint8_t row)
+{
+    int32_t temp;
+
+    if (row > 1)
+	temp = profile.lines[row-2].temperature;
+    else
+	temp = profile.start_temp;
+
+    return temp;
+}
+
+static uint32_t profile_time(uint8_t line)
+{
+    uint32_t time = profile.lines[line].time;
+    return time;
+}
+
+static int finished;
+
+static int32_t temperature_at_time(uint32_t time) {
+    uint32_t time0, time1;
+    int32_t temp0, temp1;
+    uint8_t i;
+
+    temp1 = expand_profile_temperature(1);
+    time1 = 0;
+
+    i = 0;
+    do {
+	uint32_t ptime;
+	temp0 = temp1;
+	time0 = time1;
+	ptime = profile_time(i);
+	if (ptime > 0) {
+	    temp1 = expand_profile_temperature(2+i);
+	    time1 += ptime;
+	}
+	i++;
+	if (i >= 6)
+	    break;
+    } while (time > time1);
+
+    if (time > time1) {
+	finished = 1;
+	temp0 = temp1;
+	time0 = time1;
+	time1 += 60; /* Arbitrary number here */
+	temp1 = expand_profile_temperature(1);
+    }
+
+    if (time > time1)
+	return expand_profile_temperature(1);
+
+    return temp0 + (temp1 - temp0) * (int32_t)(time - time0) / (int32_t)(time1 - time0);
+}
+
+int main(void) {
+    time_t start;
+    time_t now;
+    time_t end;
+
+    finished = 0;
+
+    time(&start);
+
+    start = start + 10;
+
+    while (!finished) {
+	int32_t temp;
+	struct timespec interval = {0, 2000000};
+	time(&now);
+	if (now < start)
+	    temp = temperature_at_time(0);
+	else
+	    temp = temperature_at_time(now - start);
+	printf("\r%4ds       %.1f degrees", (int)(now - start), (double)temp / 4096);
+	fflush(stdout);
+	nanosleep(&interval, NULL);
+    }
+    printf("\n");
+}
+
--- a/i2c.c
+++ b/i2c.c
@ -0,0 +1,95 @@
+/* i2c.c */
+
+#include <avr/io.h>
+#include <util/twi.h>
+#include <avr/interrupt.h>
+
+#include "common.h"
+#include "beep.h"
+
+//#define i2c_wait() do { uint16_t count = 0; while (!(TWCR & (1<<TWINT))) if (count++ > 1000) break; } while (0)
+//#define i2c_status() (TWSR & 0xF8)
+#define i2c_check(status) if (i2c_status() != (status)) goto ERROR
+
+static void i2c_wait(void)
+{
+    uint16_t count = 0;
+    while (!(TWCR & (1<<TWINT)))
+        if (count++ > 1000)
+	    break;
+}
+
+static __attribute__ ((noinline)) uint8_t i2c_status(void)
+{
+    return TWSR & 0xF8;
+}
+
+uint8_t i2c_xor;
+
+void i2c_init(void)
+{
+    TWSR = 0;  /* prescaler TWPS = 0 */
+    TWBR = 10; /* minimum value allowed */
+	       /* f_SCL = clk / (16+(2*TWBR*TWPS)) */
+
+    TWCR = (1<<TWEN);
+
+    i2c_xor = 0;
+}
+
+//#define i2c_start() do { TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN); } while (0)
+//#define i2c_stop()  do { TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO); } while (0)
+//#define i2c_txbyte(data) do { TWDR = data; TWCR = (1 << TWINT) | (1<<TWEN); } while (0)
+
+static void i2c_start(void)
+{
+    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
+}
+
+static void i2c_stop(void)
+{
+    TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
+}
+
+static __attribute__((noinline)) void i2c_txbyte(uint8_t data)
+{
+    TWDR = data;
+    TWCR = (1 << TWINT) | (1<<TWEN);
+}
+
+void i2c_set_xor(uint8_t xor)
+{
+    i2c_xor = xor;
+}
+
+bool i2c_write(uint8_t address, uint8_t prefix, uint8_t bytes, uint8_t *data)
+{
+    uint8 i;
+
+    i2c_start();
+    i2c_wait();
+    i2c_check(TW_START);
+
+    i2c_txbyte((address << 1) + 0);
+    i2c_wait();
+
+    i2c_check(TW_MT_SLA_ACK);
+
+    i2c_txbyte(prefix);
+    i2c_wait();
+    i2c_check(TW_MT_DATA_ACK);
+
+    for (i = 0; i < bytes; i++) {
+	i2c_txbyte(data[i] ^ i2c_xor);
+	i2c_wait();
+	i2c_check(TW_MT_DATA_ACK);
+    }
+
+    i2c_stop();
+    return TRUE;
+
+    ERROR:
+    i2c_stop();
+    return FALSE;
+}
+
--- a/i2c.h
+++ b/i2c.h
@ -0,0 +1,12 @@
+/* i2c.h */
+
+#ifndef _I2C_H_
+#define _I2C_H_
+
+#include "common.h"
+
+void i2c_init(void);
+bool i2c_write(uint8_t address, uint8_t prefix, uint8_t bytes, uint8_t *data);
+void i2c_set_xor(uint8_t xor);
+
+#endif
--- a/menu.c
+++ b/menu.c
@ -0,0 +1,970 @@
+/* menu.c */
+
+//#include <stdio.h>
+
+#include <stddef.h>
+#include <string.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/atomic.h>
+
+#include "common.h"
+#include "menu.h"
+#include "display.h"
+#include "timer.h"
+#include "therm.h"
+#include "config.h"
+#include "beep.h"
+#include "fields.h"
+#include "profile.h"
+#include "control.h"
+
+uint8_t menu_current;
+uint8_t menu_row;
+uint8_t field_row;
+uint8_t menu_next;
+uint8_t menu_redraw;
+bool edit_dirty;
+
+#define REDRAW_NONE 0
+#define REDRAW_FIELDS 1
+#define REDRAW_ALL 2
+
+uint8_t run_status;
+
+bool menu_editing;
+uint8_t menu_editing_field;
+
+menu_t *menu_current_p;
+
+const char str_b[] PROGMEM = "B";
+const char str_e[] PROGMEM = "E";
+const char str_j[] PROGMEM = "J";
+const char str_k[] PROGMEM = "K";
+const char str_n[] PROGMEM = "N";
+const char str_r[] PROGMEM = "R";
+const char str_s[] PROGMEM = "S";
+const char str_t[] PROGMEM = "T";
+
+PGM_P const enum_thermocouple_types[] PROGMEM = {
+    str_b,
+    str_e,
+    str_j,
+    str_k,
+    str_n,
+    str_r,
+    str_s,
+    str_t
+};
+
+const char str_negative[] PROGMEM = "-";
+const char str_positive[] PROGMEM = "+";
+
+PGM_P const enum_posneg[] PROGMEM = {
+    str_negative,
+    str_positive
+};
+
+const char str_off[] PROGMEM = "Off";
+const char str_on[]  PROGMEM = "On";
+
+PGM_P const enum_boolean[] PROGMEM = {
+    str_off,
+    str_on
+};
+
+const char str_50hz[] PROGMEM = "50Hz";
+const char str_60hz[] PROGMEM = "60Hz";
+
+PGM_P const enum_frequency[] PROGMEM = {
+    str_50hz,
+    str_60hz
+};
+
+const char str_degc[]  PROGMEM = "\047C";
+const char str_degf[]  PROGMEM = "\047F";
+/* str_k already defined */
+const char str_degde[] PROGMEM = "\047De";
+const char str_degn[]  PROGMEM = "\047N";
+const char str_degr[]  PROGMEM = "\047R";
+const char str_degre[] PROGMEM = "\047Re";
+const char str_degro[] PROGMEM = "\047Ro";
+const char str_mev[]   PROGMEM = "meV";
+
+#define TEMPERATURE_CELSIUS 0
+#define TEMPERATURE_FAHRENHEIT 1
+#define TEMPERATURE_KELVIN 2
+#define TEMPERATURE_DELISLE 3
+#define TEMPERATURE_NEWTON 4
+#define TEMPERATURE_RANKINE 5
+#define TEMPERATURE_REAUMUR 6
+#define TEMPERATURE_ROMER 7
+#define TEMPERATURE_MEV 8
+
+PGM_P const enum_units[] PROGMEM = {
+    str_degc,
+    str_degf,
+    str_k,
+    str_degde,
+    str_degn,
+    str_degr,
+    str_degre,
+    str_degro,
+    str_mev
+};
+
+const char str_seconds[] PROGMEM = "s";
+const char str_minutes[] PROGMEM = "m";
+const char str_hours[] PROGMEM = "h";
+
+PGM_P const enum_time_units[] PROGMEM = {
+    str_seconds,
+    str_minutes,
+    str_hours
+};
+
+const char str_0[]   PROGMEM = "0";
+const char str_1[]   PROGMEM = "1";
+const char str_2[]   PROGMEM = "2";
+const char str_3[]   PROGMEM = "3";
+const char str_4[]   PROGMEM = "4";
+const char str_5[]   PROGMEM = "5";
+const char str_6[]   PROGMEM = "6";
+const char str_7[]   PROGMEM = "7";
+const char str_8[]   PROGMEM = "8";
+const char str_9[]   PROGMEM = "9";
+
+PGM_P const enum_digits[] PROGMEM = {
+    str_0,
+    str_1,
+    str_2,
+    str_3,
+    str_4,
+    str_5,
+    str_6,
+    str_7,
+    str_8,
+    str_9,
+};
+
+const char str_start[]     PROGMEM = "Start?";
+const char str_running[]   PROGMEM = "Run";
+const char str_finished[]  PROGMEM = "Done";
+//const char str_error[]     PROGMEM = "Error";
+
+PGM_P const enum_status[] PROGMEM = {
+    str_start,
+    str_running,
+    str_finished
+//    str_error
+};
+
+#define RUN_STATUS_READY 0
+#define RUN_STATUS_RUNNING 1
+#define RUN_STATUS_FINISHED 2
+#define RUN_STATUS_ERROR 3
+
+const char str_empty[]     PROGMEM = "";
+const char str_fault[]     PROGMEM = "FAULT";
+//const char str_open[]      PROGMEM = "Connect thermocouple";
+//const char str_chiprange[] PROGMEM = "Cold junction range";
+//const char str_temprange[] PROGMEM = "Thermocouple range";
+
+PGM_P const enum_faultstatus[] PROGMEM = {
+    str_empty,
+    str_fault
+//    str_open,
+//    str_chiprange,
+//    str_temprange
+};
+
+const char str_run_profile[]  PROGMEM = "Run profile";
+const char str_edit_profile[] PROGMEM = "Edit profile";
+const char str_configure[]    PROGMEM = "Configure";
+const char str_faultstatus[]  PROGMEM = "\x0a";
+const char str_oven[]         PROGMEM = "Oven       \x08\x02\x02\x02\x02.\x02\x04\x04\x04";
+const char str_ambient[]      PROGMEM = "Ambient    \x08\x02\x02\x02\x02.\x02\x04\x04\x04";
+
+PGM_P const menu_main[] PROGMEM = {
+    str_run_profile,
+    str_edit_profile,
+    str_configure,
+    NULL,
+    str_faultstatus,
+    NULL,
+    str_oven,
+    str_ambient
+};
+
+const char str_placeholder[] PROGMEM = "Placeholder";
+const char str_selecting_profile[]      PROGMEM = "Selecting profile";
+const char str_str[]      PROGMEM = "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01";
+const char str_editstr[]      PROGMEM = "\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11";
+
+PGM_P const menu_select_profile[] PROGMEM = {
+    str_str,
+    str_str,
+    str_str,
+    str_str,
+    str_str,
+    str_str,
+    str_str,
+    str_str
+};
+
+const char str_editing_profile[]      PROGMEM = "Editing profile";
+const char str_name_field[]      PROGMEM = "> Name field <";
+const char str_start_temperature[]      PROGMEM = "Start temp   \x18\x12\x12\x12\x12\x04<<";
+const char str_edit_field[] PROGMEM = "\x02\x02.\x02\x02/ \x12\x12\x12\x12\x13 \x18\x12\x12\x12\x12\x04<<";
+
+PGM_P const menu_edit_profile[] PROGMEM = {
+    str_editstr,
+    str_start_temperature,
+    str_edit_field,
+    str_edit_field,
+    str_edit_field,
+    str_edit_field,
+    str_edit_field,
+    str_edit_field,
+};
+
+const char str_contrast[]      PROGMEM = "Contrast          \x12\x12\x12";
+const char str_beep[]          PROGMEM = "Beep              \x15>>";
+const char str_thermocouple[]  PROGMEM = "Thermocouple        \x16";
+const char str_frequency[]     PROGMEM = "Frequency        \x17>>>";
+const char str_units[]         PROGMEM = "Units             \x14>>";
+const char str_p[]             PROGMEM = "P               \x18\x12.\x12\x12";
+const char str_i[]             PROGMEM = "I               \x18\x12.\x12\x12";
+const char str_d[]             PROGMEM = "D               \x18\x12.\x12\x12";
+
+PGM_P const menu_configuration[] PROGMEM = {
+    str_contrast,
+    str_beep,
+    str_thermocouple,
+    str_frequency,
+    str_units,
+    str_p,
+    str_i,
+    str_d
+};
+
+const char str_running_profile[]      PROGMEM = "\x09\x09\x09\x09\x09\x09\x12\x12\x12\x12\x13\x08\x02\x02\x02\x02.\x02\x04<<";
+
+PGM_P const menu_run_profile[] PROGMEM = {
+    str_running_profile,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+static void main_menu_fields(uint8_t row);
+static void configuration_fields(uint8_t row);
+static void save_configuration_fields(uint8_t row);
+static void select_profile_fields(uint8_t row);
+static void edit_profile_fields(uint8_t row);
+static void save_profile_fields(uint8_t row);
+static void update_run_status(uint8_t row);
+
+menu_t menus[] = {
+    { menu_main, 0, 2, main_menu_fields, NULL },
+    { menu_select_profile, 0, 7, select_profile_fields, NULL },
+    { menu_configuration, 0, 7, configuration_fields, save_configuration_fields },
+    { menu_edit_profile, 0, 7, edit_profile_fields, save_profile_fields },
+    { menu_run_profile, 7, 7, update_run_status, NULL }
+};
+
+#define TEMPERATURE_UNIT 0x1000L
+
+int8_t temp_n[] = {1, 9, 1, -3, 33, 9, 4, 21, 10};
+int8_t temp_d[] = {1, 5, 1, 2, 100, 5, 5, 40, 116};
+int32_t temp_off[] = {0, 32*TEMPERATURE_UNIT, 1118822, -614400, 0, 2013880, 0, 30720, 96450};
+
+int32_t temperature_from_kelvin(temp_t temp)
+{
+    uint8_t units = config.units;
+    int32_t temp32 = temp;
+    int32_t source = ((temp32-2732)<<12) / 10;
+    int32_t result;
+    result = source * temp_n[units] / temp_d[units] + temp_off[units];
+//    printf("temp = %d, source = %d (%x), result = %d (%x)\n", temp, source, source, result, result);
+    return result;
+}
+
+temp_t temperature_to_kelvin(int32_t source)
+{
+    uint8_t units = config.units;
+    int32_t result = (source - temp_off[units]) * temp_d[units] / temp_n[units];
+
+    return therm_reduce(result);
+}
+
+static void update_run_status(uint8_t row)
+{
+    temp_t temp = therm_temp();
+    write_field_enum(0, run_status);
+    write_field_uint16(1, control_now());
+    write_field_enum(2, 0);
+    write_field_temperature(3, TRUE, temp);
+}
+
+static void main_menu_fields(uint8_t row)
+{
+    temp_t temp;
+
+    switch (row) {
+    case 4:
+	write_field_enum(0, therm_fault()?1:0);
+	return;
+    case 6:
+	temp = therm_temp();
+	break;
+    case 7:
+	temp = therm_coldtemp();
+	break;
+    default:
+	return;
+    }
+
+    write_field_temperature(0, TRUE, temp);
+}
+
+static void configuration_fields(uint8_t row)
+{
+    if (row == 0) {
+	write_field_uint8(0, config.contrast);
+	return;
+    }
+
+    if (row > 4) {
+	int16_t value16;
+	int32_t val;
+	switch (row) {
+	case 5:
+	    value16 = config.p;
+	    break;
+	case 6:
+	    value16 = config.i;
+	    break;
+	case 7:
+	    value16 = config.d;
+	    break;
+	default:
+	    return;
+	}
+	val = (int32_t)value16 << 5;
+	write_field_fracint(0, TRUE, TRUE, val);
+    } else {
+	uint8_t value8;
+	switch (row) {
+	case 1:
+	    value8 = config.beep;
+	    break;
+	case 2:
+	    value8 = config.thermocouple_type;
+	    break;
+	case 3:
+	    value8 = config.frequency;
+	    break;
+	case 4:
+	    value8 = config.units;
+	    break;
+	}
+	write_field_enum(0, value8);
+    }
+}
+
+static void save_configuration_fields(uint8_t row)
+{
+    if (row == 0) {
+	config.contrast = read_field_uint8(0);
+	return;
+    }
+
+    if (row > 4) {
+	int16_t value16 = read_field_fracint(0, TRUE) >> 5;
+	switch (row) {
+	case 5:
+	    config.p = value16;
+	    break;
+	case 6:
+	    config.i = value16;
+	    break;
+	case 7:
+	    config.d = value16;
+	    break;
+	}
+    } else {
+	uint8_t value8 = read_field_enum(0);
+	switch (row) {
+	case 1: 
+	    config.beep = value8;
+	    break;
+	case 2: 
+	    config.thermocouple_type = value8;
+	    break;
+	case 3: 
+	    config.frequency = value8;
+	    break;
+	case 4: 
+	    config.units = value8;
+	    break;
+	}
+    }
+}
+
+static void select_profile_fields(uint8_t row)
+{
+    profile_select(row);
+    memcpy(field_values, &profile_p->name, PROFILE_NAME_LENGTH);
+}
+
+static void save_profile_fields(uint8_t row)
+{
+    int32_t temp;
+    temp_t k_temp;
+    uint8_t n;
+
+    if (row == 0) {
+	memcpy(profile_p->name, field_values, PROFILE_NAME_LENGTH);
+	return;
+    }
+
+    n = find_field_number(find_editable_field(0, FALSE));
+
+    temp = read_field_fracint(n+((row == 1)?0:2), FALSE);
+
+    k_temp = temperature_to_kelvin(temp);
+    set_profile_temperature(k_temp);
+
+    if (row == 1)
+	return;
+
+    set_profile_time(row-2, read_field_uint16(n), read_field_enum(n+1));
+}
+
+static void edit_profile_fields(uint8_t row)
+{
+    int32_t unit_temp, prev_temp, step;
+    temp_t temp;
+    uint16_t time;
+    uint8_t time_units;
+    if (row == 0) {
+	memcpy(field_values, profile_p->name, PROFILE_NAME_LENGTH);
+	return;
+    }
+
+    temp = get_profile_temperature(row);
+    write_field_temperature(((row == 1)?0:4), FALSE, temp);
+    if (row == 1)
+	return;
+
+    unit_temp = temperature_from_kelvin(temp);
+    prev_temp = temperature_from_kelvin(get_profile_temperature(row-1));
+
+    time = profile_get_time(row-2);
+    time_units = profile_get_time_units(row-2);
+
+    if (time == 0)
+	step = 0;
+    else
+	step = (unit_temp - prev_temp) / time;
+
+    write_field_fracint(0, FALSE, TRUE, step);
+    write_field_uint16(2, time);
+    write_field_enum(3, time_units);
+}
+
+#define MENU_MAIN 0
+#define MENU_SELECT_PROFILE 1
+#define MENU_CONFIGURATION 2
+#define MENU_EDIT_PROFILE 3
+#define MENU_RUN_PROFILE 4
+
+char menu_getchar(uint8_t col)
+{
+    PGM_P ptr = get_string(&menu_current_p->text[field_row]);
+
+    if (!ptr)
+	return '\0';
+
+    if (col > 20)
+	return '\0';
+
+    return pgm_read_byte(ptr + col);
+}
+
+field_t fields[] = {
+    {NULL /* ASCII */, 127-32, 1},
+    {enum_digits, ARRAY_SIZE(enum_digits), 1},
+    {enum_time_units, ARRAY_SIZE(enum_time_units), 1},
+    {enum_units, ARRAY_SIZE(enum_units), 3},
+    {enum_boolean, ARRAY_SIZE(enum_boolean), 3},
+    {enum_thermocouple_types, ARRAY_SIZE(enum_thermocouple_types), 1},
+    {enum_frequency, ARRAY_SIZE(enum_frequency), 4},
+    {enum_posneg, ARRAY_SIZE(enum_posneg), 1},
+    {enum_status, ARRAY_SIZE(enum_status), 6},
+    {enum_faultstatus, ARRAY_SIZE(enum_faultstatus), 21}
+};
+
+static void display_field(char c, uint8_t col)
+{
+    uint8_t i;
+
+    if (field_is_text(c)) {
+	if ((field_values[col] >= 32) && (field_values[col] < 32+field_display_entries(c)))
+	    display_putchar(field_values[col]);
+	else
+	    display_putchar('?');
+	return;
+    }
+
+    if (field_values[col] >= field_display_entries(c)) {
+	for (i = 0; i < field_length(c); i++)
+	    display_putchar('?');
+    } else {
+	PGM_P str = field_text(c, field_values[col]);
+	i = 0;
+	if (field_length(c) > 1) {
+	    i = field_length(c) - strlen_P(str);
+	    if (menu_getchar(col+1) == '>')
+		for (; i; i--)
+		    display_putchar(' ');
+	}
+	display_putstr_P(str);
+	for (; i; i--)
+	    display_putchar(' ');
+    }
+}
+
+#define menu_draw_current_row() menu_draw_row(menu_row)
+
+static void menu_set_fields(uint8_t row)
+{
+    menu_t *menu = menu_current_p;
+    field_row = row;
+    if ((!menu_editing) && menu->get_field)
+	menu->get_field(row);
+}
+
+static void menu_draw_row(uint8_t row)
+{
+    uint8_t col;
+    display_settextpos(0, row);
+    display_setinverse((row == menu_row) && !menu_editing);
+    if (get_string(&menu_current_p->text[row])) {
+	char c;
+	menu_set_fields(row);
+	col = 0;
+	while ((c = menu_getchar(col)) != '\0') {
+	    if (menu_editing)
+		display_setinverse(col == menu_editing_field);
+	    if (is_field(c)) {
+		display_field(c, col);
+		col += field_length(c);
+	    } else {
+		display_putchar(c);
+		col++;
+	    }
+	}
+    }
+    display_clearline();
+}
+
+#if 1
+static void display_menu(bool all)
+{
+    uint8_t row;
+
+    for (row = 0; row < 8; row++) {
+	field_row = row;
+	if (all || (find_field(0) != 255))
+	    menu_draw_row(row);
+    }
+}
+#endif
+
+void set_menu(uint8_t new_menu)
+{
+    if (new_menu == menu_current)
+	return;
+    menu_current = new_menu;
+    menu_current_p = &menus[new_menu];
+    menu_redraw = TRUE;
+//    memcpy_P(&menu_row, &menu_current_p->first_line, sizeof(menu_row));
+    menu_row = 0;
+    menu_editing = FALSE;
+}
+
+void menu_init(void)
+{
+    /* Make sure set_menu does its work */
+    menu_current = MENU_MAIN+1;
+    set_menu(MENU_MAIN);
+    display_init();
+}
+
+#define BUTTON_UP 1
+#define BUTTON_DOWN 2
+#define BUTTON_LEFT 4
+#define BUTTON_RIGHT 3
+
+static void menu_end_edit(void)
+{
+    menu_t *menu = menu_current_p;
+    menu_editing = FALSE;
+    if (menu->put_field)
+	menu->put_field(menu_row);
+    menu_redraw = TRUE;
+}
+
+static void menu_edit_new_field(uint8_t field, bool left)
+{
+    field = find_editable_field(field, left);
+    menu_editing_field = field;
+    menu_editing = TRUE;
+    edit_dirty = FALSE;
+    if (field == 255)
+	menu_end_edit();
+    menu_draw_row(menu_row);
+}
+
+static void increment_value(int8_t inc)
+{
+    uint8_t val = field_values[menu_editing_field];
+    uint8_t c = menu_getchar(menu_editing_field);
+
+    uint8_t min = 0;
+    uint8_t max = field_display_entries(c) - 1;
+
+    if (field_is_text(c)) {
+	min += 32;
+	max += 32;
+    }
+
+    if (inc < 0 && val == min)
+	val = max;
+    else if (inc > 0 && val == max)
+	val = min;
+    else
+	val += inc;
+
+    field_values[menu_editing_field] = val;
+    edit_dirty = TRUE;
+}
+
+static void menu_navigate_up(void)
+{
+    if (menu_row == menu_current_p->first_line)
+       return;
+
+    menu_row--;
+    menu_draw_row(menu_row+1);
+    menu_draw_row(menu_row);
+}
+
+static void menu_navigate_down(void)
+{
+    if (menu_row == menu_current_p->last_line)
+       return;
+
+    menu_row++;
+    menu_draw_row(menu_row-1);
+    menu_draw_row(menu_row);
+}
+
+static void menu_navigate_into(void)
+{
+    uint8_t menu = menu_current;
+    switch (menu) {
+    case MENU_MAIN:
+	switch (menu_row) {
+	case 0:
+	    menu = MENU_SELECT_PROFILE;
+	    menu_next = MENU_RUN_PROFILE;
+	    break;
+	case 1:
+	    menu = MENU_SELECT_PROFILE;
+	    menu_next = MENU_EDIT_PROFILE;
+	    break;
+	case 2:
+	    menu = MENU_CONFIGURATION;
+	    break;
+	}
+	break;
+
+    case MENU_SELECT_PROFILE:
+	menu = menu_next;
+	profile_select(menu_row);
+	break;
+
+    case MENU_RUN_PROFILE:
+	control_start();
+	run_status = RUN_STATUS_RUNNING;
+	break;
+
+    default:
+	menu_edit_new_field(21, TRUE);
+	break;
+    }
+
+    set_menu(menu);
+}
+
+static void menu_navigate_back(void)
+{
+    uint8_t menu = menu_current;
+    switch (menu) {
+    case MENU_EDIT_PROFILE:
+	profile_save();
+    case MENU_RUN_PROFILE:
+	menu = MENU_SELECT_PROFILE;
+	break;
+    default:
+	menu = MENU_MAIN;
+	break;
+    }
+
+    set_menu(menu);
+}
+
+static void menu_process_leftright(bool left)
+{
+    int8_t increment = left?(-1):1;
+
+    if (menu_editing)
+	menu_edit_new_field(menu_editing_field+increment, left);
+    else {
+	if (left)
+	    menu_navigate_back();
+	else
+	    menu_navigate_into();
+    }
+}
+
+static void menu_process_updown(bool up)
+{
+    int8_t increment = up?1:(-1);
+
+    if (menu_editing) {
+	increment_value(increment);
+	menu_draw_row(menu_row);
+    } else {
+	if (up)
+	    menu_navigate_up();
+	else
+	    menu_navigate_down();
+    }
+}
+
+#define GRAPH_POINTS 128
+//#define GRAPH_POINTS 128
+//#define GRAPH_POINTS 12
+#define GRAPH_START_X 0
+
+#define GRAPH_HEIGHT (GRAPH_PAGES * 8)
+#define GRAPH_PAGES 7
+#define GRAPH_START_Y 1
+
+//uint8_t graph_desired[GRAPH_POINTS+1];
+//uint8_t graph_actual[GRAPH_POINTS+1];
+uint8_t graph_actual[4];
+
+static void minmax_mark(uint8_t *min_p, uint8_t *max_p, uint8_t mid)
+{
+    uint8_t min = *min_p;
+    uint8_t max = *max_p;
+
+    if (mid == 255) {
+	*min_p = 255;
+	return;
+    }
+
+    if (min == 255)
+	min = mid;
+    if (max == 255)
+	max = mid;
+    if (max < min) {
+	uint8_t tmp = min;
+	min = max;
+	max = tmp;
+    }
+    *min_p = mid - (mid-min)/2;
+    *max_p = (max-mid)/2 + mid;
+}
+
+temp_t graph_temp_min, graph_temp_range;
+uint32_t time_per_unit;
+uint8_t graph_cursor;
+
+static uint8_t graph_value(temp_t temp);
+
+static uint8_t graph_at(uint8_t col)
+{
+    return graph_value(temperature_at_time(col*time_per_unit));
+}
+
+static void graphics_draw_column(uint8_t col)
+{
+    uint8_t data;
+    uint8_t pr_mid, pr_min, pr_max;
+    uint8_t act_mid, act_min, act_max;
+    uint8_t i;
+    uint8_t page;
+    uint8_t act_col;
+
+    if (col >= GRAPH_POINTS)
+	return;
+
+    if (col == graph_cursor)
+	act_col = 1;
+    else
+	act_col = 0;
+
+    pr_mid = graph_at(col);
+    pr_min = graph_at(col-1);
+    pr_max = graph_at(col+1);
+
+    minmax_mark(&pr_min, &pr_max, pr_mid);
+
+    act_min = graph_actual[act_col];
+    act_mid = graph_actual[act_col+1];
+    act_max = graph_actual[act_col+2];
+
+    minmax_mark(&act_min, &act_max, act_mid);
+
+    if (col == 0) {
+	pr_min = 0;
+	pr_max = GRAPH_HEIGHT-1;
+    }
+
+    page = GRAPH_PAGES-1;
+    for (i = 0; i < GRAPH_HEIGHT; i++) {
+	data <<= 1;
+	if ((i >= pr_min && i <= pr_max) ||
+	    (i >= act_min && i <= act_max) ||
+	    (i == 0)) {
+		data |= 1;
+	}
+	if ((i & 0x7) == 7) {
+	    if (graph_cursor == col)
+		data |= 0x55;
+	    display_setposition(col, GRAPH_START_Y + page);
+	    display_data(1, &data);
+	    page--;
+	}
+    }
+}
+
+static void graphics_draw_screen(void)
+{
+    int i;
+
+    /* initialise profile */
+
+    for (i = 0; i < GRAPH_POINTS; i++)
+	graphics_draw_column(i);
+}
+
+static uint8_t __attribute__ ((noinline)) graph_value(temp_t temp)
+{
+    int32_t v;
+
+    if (temp == INVALID_TEMPERATURE)
+	v = 255;
+    else
+	v = ((int32_t)temp - graph_temp_min) * GRAPH_HEIGHT / graph_temp_range;
+
+    return v;
+}
+
+static void graphics_init(void)
+{
+    uint8_t i;
+    uint32_t total_time;
+    temp_t temp_min, temp_max;
+    uint8_t *graph_actual_p;
+
+    run_status = RUN_STATUS_READY;
+
+    temp_min = temp_max = get_profile_temperature(1);
+
+    total_time = 0;
+
+    for (i = 0; i < 6; i++) {
+	temp_t temp = get_profile_temperature(i+2);
+	uint32_t time = profile_time(i);
+	if (time == 0)
+	    continue;
+	total_time += time;
+	if (temp > temp_max)
+	    temp_max = temp;
+	if (temp < temp_min)
+	    temp_min = temp;
+    }
+
+    time_per_unit = (total_time + GRAPH_POINTS - 1) / GRAPH_POINTS;
+
+    temp_min -= 10 * 10;
+    temp_max += 10 * 10;
+    graph_temp_range = temp_max - temp_min;
+    graph_temp_min = temp_min;
+
+    graph_cursor = 255;
+
+    graph_actual_p = &graph_actual[0];
+
+    for (i = 0; i < 4; i++)
+	*(graph_actual_p++) = 255;
+}
+
+static void graphics_poll(void)
+{
+    if (menu_redraw) {
+	graphics_init();
+	graphics_draw_screen();
+    }
+    if (run_status == RUN_STATUS_RUNNING) {
+	uint8_t col = control_now() / time_per_unit;
+	if (col <= GRAPH_POINTS) {
+	    if (col != graph_cursor) {
+		graph_actual[0] = graph_actual[1];
+		graph_actual[1] = graph_actual[2];
+	    }
+	    graph_actual[2] = graph_value(therm_temp());
+	} else {
+	    run_status = RUN_STATUS_FINISHED;
+	}
+	graph_cursor = col;
+	graphics_draw_column(col-1);
+	graphics_draw_column(col);
+    }
+}
+
+void menu_poll(void)
+{
+    uint8_t button_pressed;
+    
+    ATOMIC_BLOCK(ATOMIC_FORCEON) {
+	button_pressed = button;
+	button = 0;
+    }
+
+    if (button_pressed == BUTTON_LEFT || button_pressed == BUTTON_RIGHT)
+	menu_process_leftright(button_pressed == BUTTON_LEFT);
+    if (button_pressed == BUTTON_UP || button_pressed == BUTTON_DOWN)
+	menu_process_updown(button_pressed == BUTTON_UP);
+
+    if (menu_redraw || (menu_current == MENU_RUN_PROFILE) || (menu_current == MENU_MAIN)) {
+	display_menu(menu_redraw);
+	menu_set_fields(menu_row);
+    }
+
+    if (menu_current == MENU_RUN_PROFILE) {
+	graphics_poll();
+    }
+    menu_redraw = FALSE;
+}
--- a/menu.h
+++ b/menu.h
@ -0,0 +1,30 @@
+/* menu.h */
+
+#ifndef _MENU_H_
+#define _MENU_H_
+
+#include "common.h"
+
+void menu_init(void);
+void menu_poll(void);
+void menu_new_data(void);
+
+/* This stuff is for fields.c only, for now */
+#include "fields.h"
+extern field_t fields[];
+char menu_getchar(uint8_t col);
+typedef void (*field_handler)(uint8_t row);
+typedef struct menu {
+    PGM_P const *text;
+    uint8_t first_line;
+    uint8_t last_line;
+    field_handler get_field;
+    field_handler put_field;
+} menu_t;
+extern menu_t *menu_current_p;
+int32_t temperature_from_kelvin(temp_t source);
+temp_t temperature_to_kelvin(int32_t source);
+extern uint8_t field_row;
+extern uint8_t current_profile;
+
+#endif
--- a/profile.c
+++ b/profile.c
@ -0,0 +1,130 @@
+/* profile.c */
+
+#include <stddef.h>
+#include <string.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/atomic.h>
+
+#include "common.h"
+#include "profile.h"
+#include "menu.h"
+#include "config.h"
+#include "fields.h"
+#include "therm.h"
+
+const profile_t profiles[2] PROGMEM = {
+//  { "123456789012345678901", 250,
+//    { "Lead free solder     ", 250 + 2732, {
+    { "NoPb  ", 250 + 2732, {
+        { 1500 + 2732, 100, 0 },
+        { 2000 + 2732, 100, 0 },
+        { 2500 + 2732,  40, 0 },
+        { 2500 + 2732,  30, 0 },
+        { 1000 + 2732,  30, 0 },
+        {    0 + 2732,   0, 0 }
+    } },
+//    { "Leaded solder        ", 250 + 2732, {
+    { "Pb    ", 250 + 2732, {
+        { 1000 + 2732, 100, 0 },
+        { 1500 + 2732, 100, 0 },
+        { 2350 + 2732,  40, 0 },
+        { 2350 + 2732,  30, 0 },
+        { 1000 + 2732,  30, 0 },
+        {    0 + 2732,   0, 0 }
+    } }
+};
+
+profile_t profile;
+profile_t *profile_p = &profile;
+uint8_t current_profile;
+
+void profile_select(uint8_t n)
+{
+    current_profile = n;
+    memcpy_P(&profile, &profiles[n], sizeof(profile_t));
+}
+
+void profile_save(void)
+{
+//    memcpy(&profiles[current_profile], profile_p, sizeof(profile_t));
+}
+
+
+#if 0
+static void select_profile_fields(uint8_t row)
+{
+    memcpy(field_values, profiles[row].name, PROFILE_NAME_LENGTH);
+}
+#endif
+
+void set_profile_temperature(temp_t temp)
+{
+    uint8_t row = field_row;
+
+    if (row > 1)
+	profile_p->lines[row-2].temperature = temp;
+    else
+	profile_p->start_temp = temp;
+}
+
+temp_t get_profile_temperature(uint8_t row)
+{
+    if (row > 1)
+	return profile_p->lines[row-2].temperature;
+    else
+	return profile_p->start_temp;
+}
+
+void set_profile_time(uint8_t row, uint16_t time, uint8_t time_units)
+{
+    profile_p->lines[row].time = time;
+    profile_p->lines[row].time_units = time_units;
+}
+
+uint16_t profile_get_time(uint8_t line)
+{
+    return profile_p->lines[line].time;
+}
+
+uint8_t profile_get_time_units(uint8_t row)
+{
+    return profile_p->lines[row].time_units;
+}
+
+uint32_t profile_time(uint8_t line)
+{
+    uint32_t time = profile_get_time(line);
+    uint8_t time_units = profile_get_time_units(line);
+    while (time_units--)
+	time = time * 60;
+
+    return time;
+}
+
+temp_t temperature_at_time(uint32_t time) {
+    uint32_t time0, time1;
+    temp_t temp0, temp1;
+    uint8_t i;
+
+    temp1 = get_profile_temperature(1);
+    time1 = 0;
+
+    for (i = 0; i < 6; i++) {
+	uint32_t ptime;
+	temp0 = temp1;
+	time0 = time1;
+	ptime = profile_time(i);
+	if (ptime > 0) {
+	    temp1 = get_profile_temperature(2+i);
+	    time1 += ptime;
+	}
+	if (time <= time1)
+	    break;
+    }
+
+    if (time > time1)
+	return INVALID_TEMPERATURE;
+
+    return temp0 + ((int32_t)temp1 - (int32_t)temp0) * (int32_t)(time - time0) / (int32_t)(time1 - time0);
+}
--- a/profile.h
+++ b/profile.h
@ -0,0 +1,34 @@
+/* profile.h */
+
+#ifndef _PROFILE_H_
+#define _PROFILE_H_
+
+#include "common.h"
+
+void set_profile_temperature(temp_t temp);
+temp_t get_profile_temperature(uint8_t row);
+uint32_t profile_time(uint8_t line);
+temp_t temperature_at_time(uint32_t time);
+void set_profile_time(uint8_t row, uint16_t time, uint8_t time_units);
+uint16_t profile_get_time(uint8_t row);
+uint8_t profile_get_time_units(uint8_t row);
+void profile_select(uint8_t n);
+void profile_save(void);
+
+typedef struct profile_line {
+    uint16_t temperature; /* store degrees C * 10 reference to absolute zero */
+    unsigned int time:14;
+    unsigned int time_units:2;
+} profile_line_t;
+
+#define PROFILE_NAME_LENGTH 6
+
+typedef struct profile {
+    char name[PROFILE_NAME_LENGTH];
+    uint16_t start_temp;
+    profile_line_t lines[6];
+} profile_t;
+
+extern profile_t *profile_p;
+
+#endif
--- a/reflow.c
+++ b/reflow.c
@ -0,0 +1,36 @@
+/* reflow.c */
+
+#include "common.h"
+#include "therm.h"
+#include "display.h"
+#include "menu.h"
+#include "beep.h"
+#include "timer.h"
+#include "control.h"
+
+/*
+ * Reflow controller firmware
+ * coolfactor.org
+ */
+
+int main(void)
+{
+    uint32_t last_seconds = 0;
+    uint32_t this_seconds;
+    /* init code here */
+
+    therm_init();
+    timer_init();
+    menu_init();
+
+    while (1) {
+	therm_read();
+//	menu_new_data();
+	this_seconds = seconds;
+	if (this_seconds != last_seconds) {
+	    control_poll();
+	    last_seconds = this_seconds;
+	}
+      menu_poll();
+    }
+}
--- a/spi.c
+++ b/spi.c
@ -0,0 +1,54 @@
+/* spi.c */
+
+#include <avr/io.h>
+
+#include "common.h"
+
+#define DDR_SPI DDRB
+#define PORT_SPI PORTB
+
+#define PIN_MOSI 3
+#define PIN_SCK 5
+#define PIN_SS 2
+
+void spi_init(void)
+{
+    /* Set MOSI, SCK and SS output */
+    PORT_SPI |= (1<<PIN_SS);
+    DDR_SPI |= (1<<PIN_MOSI) | (1<<PIN_SCK) | (1<<PIN_SS);
+
+    /* Enable SPI, Master, set clock rate fck/16 */
+//    SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR0);
+
+//    SPCR = (1<<SPE) | (1<<MSTR) | /*(1<<SPR1) |*/ (1<<SPR0) | (1<<CPHA) | (1<<CPOL);
+    SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR1) | (1<<SPR0) | (1<<CPHA) | (1<<CPOL);
+
+}
+
+void spi_start(void)
+{
+    PORT_SPI &= ~(1<<PIN_SS);
+}
+
+void spi_stop(void)
+{
+    PORT_SPI |= (1<<PIN_SS);
+}
+
+char spi_txrxbyte(char data)
+{
+    /* Start transmission */
+    SPDR = data;
+
+    /* Wait for transmission complete */
+    while (!(SPSR & (1<<SPIF)))
+	;
+
+    /* Return byte received */
+    return SPDR;
+}
+
+char spi_rxbyte(void)
+{
+    return spi_txrxbyte(0);
+}
--- a/spi.h
+++ b/spi.h
@ -0,0 +1,15 @@
+/* spi.h */
+
+#ifndef _SPI_H_
+#define _SPI_H_
+
+void spi_init(void);
+char spi_txrxbyte(char data);
+char spi_rxbyte(void);
+void spi_start(void);
+void spi_stop(void);
+
+#define spi_txbyte(data) (void)spi_txrxbyte(data)
+//#define spi_rxbyte() spi_txrxbyte(0)
+
+#endif
--- a/test/Makefile
+++ b/test/Makefile
@ -0,0 +1,23 @@
+# Makefile
+
+VPATH = ..
+
+OBJECTS.test-menu     = test-menu.o test-display.o menu.o test-therm.o config.o
+OBJECTS.test-graphics = test-graphics.o menu.o test-i2c.o display.o test-therm.o config.o font.o fields.o profile.o control.o
+
+CFLAGS = -Wall -Werror -Os -I. -I..
+LDLIBS = -lncurses
+
+CFLAGS+=`pkg-config --cflags sdl SDL_gfx`
+LDLIBS+=`pkg-config --libs sdl SDL_gfx`
+LDLIBS+=-lm
+
+#all:	test-menu test-graphics
+all:	test-graphics
+
+test-menu: $(OBJECTS.test-menu)
+
+test-graphics: $(OBJECTS.test-graphics)
+
+clean:
+	rm -f test-menu $(OBJECTS.test-menu) $(OBJECTS.test-graphics)
--- a/test/avr/io.h
+++ b/test/avr/io.h
--- a/test/avr/pgmspace.h
+++ b/test/avr/pgmspace.h
@ -0,0 +1,13 @@
+#ifndef _PGMSPACE_H_
+#define _PGMSPACE_H_
+
+#include <string.h>
+
+#define PROGMEM
+#define PGM_P const char *
+#define pgm_read_byte(x) (*(char *)(x))
+#define pgm_read_ptr(x) (*(char **)(x))
+#define strlen_P strlen
+#define memcpy_P memcpy
+
+#endif
--- a/test/test-display.c
+++ b/test/test-display.c
@ -0,0 +1,68 @@
+/* test-display.c */
+
+#include <stdlib.h>
+#include <ncurses.h>
+
+#include "types.h"
+
+unsigned int curpos;
+
+void display_cleanup(void)
+{
+    endwin();
+}
+
+void display_data(uint8_t len, uint8_t *data)
+{
+    /* can't do anything with this graphics */
+}
+
+void display_init(void)
+{
+    initscr();
+    noecho();
+    atexit(display_cleanup);
+}
+
+void display_setposition(char col, char row)
+{
+    move(row, col/6);
+    curpos = col/6;
+    //printf("Position set to row %d, col %d\n", row, col/6);
+}
+
+void display_setinverse(bool on)
+{
+    if (on)
+	attron(A_REVERSE);
+    else
+	attroff(A_REVERSE);
+    //printf("Inverse set to %s\n", on?"on":"off");
+}
+
+void display_putchar(char c)
+{
+    printw("%c", c);
+    refresh();
+    curpos++;
+    //printf("Put character %c\n", c);
+}
+
+void display_putstr(char *s)
+{
+    while (*s)
+	display_putchar(*(s++));
+}
+
+void display_putstr_P(const char *s)
+{
+    display_putstr((char *)s);
+}
+
+void display_clearline(void)
+{
+    while (curpos < 21) {
+	display_putchar(' ');
+    }
+    //printf("Cleared line\n");
+}
--- a/test/test-graphics.c
+++ b/test/test-graphics.c
@ -0,0 +1,70 @@
+/* test-graphics.c */
+
+#include "SDL.h"
+#include "SDL_gfxPrimitives.h"
+#include "menu.h"
+
+#include "common.h"
+
+SDL_Surface *screen;
+
+SDL_Event event;
+
+#define WHITE 0xffffffff
+
+int button = 0;
+
+uint32_t seconds;
+uint8_t output0;
+
+void beep_off(void)
+{
+}
+
+int main(int argc, char *argv[]) {
+    SDL_Init(SDL_INIT_VIDEO);
+
+    screen = SDL_SetVideoMode(128, 64, 16, SDL_SWSURFACE);
+
+    SDL_WM_SetCaption("Reflow oven controller", "Reflow oven controller");
+
+    bool done=FALSE;
+
+    menu_init();
+
+    while(!done) {
+	while(SDL_PollEvent(&event)) {
+	    if (event.type == SDL_QUIT) {
+		done=TRUE;
+	    }
+	    if (event.type == SDL_KEYDOWN) {
+                switch(event.key.keysym.sym) {
+		case SDLK_UP:
+		    button = 1;
+		    break;
+		case SDLK_DOWN:
+		    button = 2;
+		    break;
+		case SDLK_LEFT:
+		    button = 4;
+		    break;
+		case SDLK_RIGHT:
+		    button = 3;
+		    break;
+		case SDLK_q:
+		    done = TRUE;
+		    break;
+		default:
+		    break;
+		}
+	    }
+	    menu_poll();
+	    SDL_Flip(screen);
+	}
+    }
+
+    SDL_Quit();
+
+    return 0;
+}
+
--- a/test/test-i2c.c
+++ b/test/test-i2c.c
@ -0,0 +1,62 @@
+/* i2c.c */
+
+#include "common.h"
+#include "SDL.h"
+#include "SDL_gfxPrimitives.h"
+
+
+#define WHITE 0xffffffff
+#define BLACK 0x000000ff
+
+uint8_t i2c_xor;
+uint8_t page;
+uint8_t col;
+
+
+extern SDL_Surface *screen;
+
+void i2c_init(void)
+{
+}
+
+void i2c_set_xor(char xor)
+{
+    i2c_xor = xor;
+}
+
+bool i2c_write(char address, char prefix, char bytes, char *data)
+{
+    uint8_t i, j;
+
+    switch ((uint8_t) prefix) {
+    case 0x80:
+	switch (data[0] & 0xf0) {
+	case 0xb0:
+	    page = data[0] & 0xf;
+	    break;
+	case 0x00:
+	    col = (col & ~0xf) + (data[0] & 0xf);
+	    break;
+	case 0x10:
+	    col = (col & 0xf) + ((data[0] & 0xf) << 4);
+	    break;
+	}
+	break;
+    case 0x40:
+	for (i = 0; i < bytes; i++) {
+	    uint8_t byte = data[i] ^ i2c_xor;
+	    for (j = 0; j < 8; j++) {
+		pixelColor(screen, col, page*8 + j, (byte & 1)?WHITE:BLACK);
+		byte = byte >> 1;
+	    }
+	    col++;
+	    if (col > 127)
+		col = 0;
+	}
+	break;
+    }
+
+
+    return TRUE;
+}
+
--- a/test/test-menu.c
+++ b/test/test-menu.c
@ -0,0 +1,46 @@
+/* test-menu.c */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ncurses.h>
+#include "display.h"
+#include "menu.h"
+
+int button = 0;
+
+int main(void)
+{
+/*
+    display_init();
+    display_putstr("Hello, world!");
+*/
+
+    menu_init();
+    keypad(stdscr, TRUE);
+    menu_poll();
+
+    while (1) {
+	int c = getch();
+	switch (c) {
+	case KEY_UP:
+	    button = 1;
+	    break;
+	case KEY_DOWN:
+	    button = 2;
+	    break;
+	case KEY_LEFT:
+	    button = 3;
+	    break;
+	case KEY_RIGHT:
+	    button = 4;
+	    break;
+	case 'q':
+	case 'Q':
+	    exit(0);
+	}
+	menu_poll();
+    }
+
+    return 0;
+}
+
--- a/test/test-therm.c
+++ b/test/test-therm.c
@ -0,0 +1,49 @@
+/* test-therm.c */
+
+#include "common.h"
+#include "therm.h"
+
+int32_t extend24(int32_t n)
+{
+    if (n & 0x00800000) {
+	return n | (~0 & 0xff000000);
+    }
+    return n;
+}
+
+temp_t therm_temp(void)
+{
+//    return extend24(0xf06000);
+    return 3932;
+#if 0
+    return 0x078000;
+    return 0x064f00;
+    return 0x52d000;
+#endif
+}
+
+temp_t therm_coldtemp(void)
+{
+    return 2987;
+#if 0
+    return 0x19800;
+#endif
+}
+
+uint8_t therm_fault(void)
+{
+    return 0;
+}
+
+temp_t therm_reduce(int32_t temp)
+{
+    temp = (temp * 10) / 4096;
+    temp += 2732;
+    if (temp < 0)
+        temp = 0;
+    if (temp > 65535)
+        temp = 65535;
+
+    return (temp_t) temp;
+}
+
--- a/test/types.h
+++ b/test/types.h
@ -0,0 +1,23 @@
+/* types.h */
+
+#ifndef _TYPES_H_
+#define _TYPES_H_
+
+/* Probably right for a PC */
+
+typedef unsigned char uint8;
+typedef signed   char int8;
+
+typedef unsigned short uint16;
+typedef signed   short int16;
+
+typedef unsigned int uint32;
+typedef signed   int int32;
+
+#ifndef TRUE
+typedef unsigned char bool;
+#define TRUE 1
+#define FALSE 0
+#endif
+
+#endif
--- a/test/util/atomic.h
+++ b/test/util/atomic.h
@ -0,0 +1 @@
+#define ATOMIC_BLOCK(x)
--- a/therm.c
+++ b/therm.c
@ -0,0 +1,68 @@
+/* therm.c */
+
+#include "common.h"
+#include "therm.h"
+
+#include "spi.h"
+
+uint8_t therm_cjth;
+uint8_t therm_cjtl;
+uint8_t therm_ltcbh;
+uint8_t therm_ltcbm;
+uint8_t therm_ltcbl;
+uint8_t therm_sr;
+
+void therm_init(void)
+{
+    spi_init();
+
+    spi_start();
+    spi_txbyte(0x80);
+    spi_txbyte(0x91); /* Automatic conversion, open detection on, 50Hz */
+    spi_txbyte(0x03); /* No averaging, K-type */
+    spi_txbyte(0x00); /* No masking. ~FAULT asserted for most faults. */
+    spi_stop();
+}
+
+void therm_read(void)
+{
+    spi_start();
+    spi_txbyte(0x0a);
+    therm_cjth  = spi_rxbyte();
+    therm_cjtl  = spi_rxbyte();
+    therm_ltcbh = spi_rxbyte();
+    therm_ltcbm = spi_rxbyte();
+    therm_ltcbl = spi_rxbyte();
+    therm_sr    = spi_rxbyte();
+    spi_stop();
+}
+
+temp_t therm_reduce(int32_t temp)
+{
+    temp = (temp * 10) / 4096;
+    temp += 2732;
+    if (temp < 0)
+        temp = 0;
+    if (temp > 65535)
+        temp = 65535;
+
+    return (temp_t) temp;
+}
+
+temp_t therm_coldtemp(void)
+{
+    int16_t temp = (int16_t) (((int16_t)therm_cjth << 8) | therm_cjtl);
+    return therm_reduce((int32_t)temp * 16);
+}
+
+temp_t therm_temp(void)
+{
+    int32_t temp = ((int32_t)therm_ltcbh << 16) | ((int32_t)therm_ltcbm << 8) | therm_ltcbl;
+
+    return therm_reduce(temp);
+}
+
+uint8_t therm_fault(void)
+{
+    return therm_sr;
+}
--- a/therm.h
+++ b/therm.h
@ -0,0 +1,17 @@
+/* therm.h */
+
+#ifndef _THERM_H_
+#define _THERM_H_
+
+#include "common.h"
+
+void therm_init(void);
+void therm_read(void);
+temp_t therm_coldtemp(void);
+temp_t therm_temp(void);
+uint8_t therm_fault(void);
+temp_t therm_reduce(int32_t);
+
+#define INVALID_TEMPERATURE 0xffff
+
+#endif
--- a/timer.c
+++ b/timer.c
@ -0,0 +1,87 @@
+/* timer.c */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include "common.h"
+#include "timer.h"
+
+uint8_t bounce_timer;
+uint8_t button;
+uint8_t button_port;
+
+#define BOUNCE_TIMER_RESET 10
+
+#define PIN_OUTPUT0 0
+#define PIN_OUTPUT1 1
+
+volatile uint8_t output0;
+volatile uint8_t output1;
+uint8_t tick;
+volatile uint32_t seconds;
+
+void timer_init(void)
+{
+    bounce_timer = 0;
+    button = 0;
+    button_port = 0;
+    tick = TICKS_PER_SECOND-1;
+    seconds = 0;
+
+    TCCR0A = (1<<CTC0) | (1<<CS02); /* clk/256 */
+    OCR0A = TIMER_MAX;
+    TIMSK0 = (1<<OCIE0A);
+
+    output0 = 0;
+    output1 = 0;
+
+    PORTD &= ~((1<<PIN_OUTPUT0) | (1<<PIN_OUTPUT1));
+    DDRD |= (1<<PIN_OUTPUT0) | (1<<PIN_OUTPUT1);
+}
+
+ISR(TIMER0_COMPA_vect)
+{
+    uint8_t port;
+    uint8_t old_button;
+    uint8_t button_pressed;
+
+    if (tick == 0) {
+	tick = TICKS_PER_SECOND-1;
+	seconds++;
+    } else
+	tick--;
+
+    old_button = button_port;
+
+    port = PIND;
+    port = (~port >> 4);
+/*
+    if (bounce_timer)
+	bounce_timer--;
+    else
+*/
+	button_port = port;
+
+    if (button_port != old_button)
+	bounce_timer = BOUNCE_TIMER_RESET;
+
+    button_pressed = button_port & ~old_button;
+    if (button_pressed & 8)
+	button = 4;
+    if (button_pressed & 4)
+	button = 3;
+    if (button_pressed & 2)
+	button = 2;
+    if (button_pressed & 1)
+	button = 1;
+
+    if ((TICKS_PER_SECOND-1 - tick) < output0)
+	PORTD |= (1<<PIN_OUTPUT0);
+    else
+	PORTD &= ~(1<<PIN_OUTPUT0);
+
+    if ((TICKS_PER_SECOND-1 - tick) < output1)
+	PORTD |= (1<<PIN_OUTPUT1);
+    else
+	PORTD &= ~(1<<PIN_OUTPUT1);
+}
--- a/timer.h
+++ b/timer.h
@ -0,0 +1,24 @@
+/* timer.h */
+
+#ifndef _TIMER_H_
+#define _TIMER_H_
+
+#include "common.h"
+
+#define CLOCK_FREQ 4000000
+#define PRESCALER 256
+#define TIMER_MAX 125
+
+/* Careful to make this an integer */
+#define TICKS_PER_SECOND (CLOCK_FREQ / (TIMER_MAX * PRESCALER))
+
+extern uint8_t button;
+
+extern volatile uint8_t output0;
+extern volatile uint8_t output1;
+
+extern volatile uint32_t seconds;
+
+void timer_init(void);
+
+#endif
--- a/types.h
+++ b/types.h
@ -0,0 +1,25 @@
+/* types.h */
+
+#ifndef _TYPES_H_
+#define _TYPES_H_
+
+/* These are correct for AVR. Change accordingly if you port. */
+
+typedef unsigned char uint8;
+typedef signed   char int8;
+
+typedef unsigned int uint16;
+typedef signed   int int16;
+
+typedef unsigned long uint32;
+typedef signed   long int32;
+
+#ifndef TRUE
+typedef unsigned char bool;
+#define TRUE 1
+#define FALSE 0
+#endif
+
+typedef uint16_t temp_t;
+
+#endif