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Some progress on i2c control.

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This commit is contained in:
Gavan Fantom
2011-05-09 13:41:53 +00:00
parent 85d33abdd9
commit 52e1c59a2e
5 changed files with 223 additions and 15 deletions
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106
main.c
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@@ -1,4 +1,6 @@
#include "i2c.h"
#define UARTBASE 0xE000C000
#define RBR 0x00
@@ -16,29 +18,47 @@
#define FDR 0x28
#define TER 0x30
#define REG(x) (((volatile unsigned char *)UARTBASE)[x])
#define UREG(x) (((volatile unsigned char *)UARTBASE)[x])
#define U0THRE ((UREG(LSR) & (1<<5))) /* UART0 transmitter holding register is empty */
#define U0DR ((UREG(LSR) & (1<<0))) /* UART0 data ready */
#define I2CBASE 0xE001C000
#define I2CONSET 0x00
#define I2STAT 0x04
#define I2DAT 0x08
#define I2ADR 0x0c
#define I2SCLH 0x10
#define I2SCLL 0x14
#define I2CONCLR 0x18
#define IREG(x) (((volatile unsigned char *)I2CBASE)[x])
#define U0THRE ((REG(LSR) & (1<<5))) /* UART0 transmitter holding register is empty */
#define U0DR ((REG(LSR) & (1<<0))) /* UART0 data ready */
#define PINSEL0 (*((volatile unsigned char *) 0xE002C000))
void init_uart(void)
{
REG(FDR) = 0x10; /* DivAddVal = 0, MulVal = 1 */
UREG(FDR) = 0x10; /* DivAddVal = 0, MulVal = 1 */
REG(LCR) = 0x80;
REG(DLM) = 0x00;
REG(DLL) = 0x08; /* 14745600 / (16*115200) */
REG(LCR) = 0x13;
REG(FCR) = 0x07;
UREG(LCR) = 0x80;
UREG(DLM) = 0x00;
UREG(DLL) = 0x08; /* 14745600 / (16*115200) */
UREG(LCR) = 0x13;
UREG(FCR) = 0x07;
}
PINSEL0 = 0x00000005; /* P0.0 and P0.1 assigned to UART */
void init_pins(void)
{
PINSEL0 = 0x00000055; /* P0.0 and P0.1 assigned to UART */
/* P0.2 and P0.3 assigned to I2C */
}
void putch(char c) {
while (!U0THRE);
REG(THR) = c;
UREG(THR) = c;
}
void putstr(char *s) {
@@ -59,9 +79,26 @@ void putint(unsigned int n) {
putstr(s+i);
}
void puthex(unsigned int n) {
char s[9];
int i;
i = 8;
s[i] = '\0';
do {
int x = n % 16;
if (x > 9)
x += 'A' - '0' - 10;
s[--i] = x + '0';
} while ((n /= 16) > 0);
putstr(s+i);
}
char getch(void) {
while (!U0DR);
return REG(RBR);
return UREG(RBR);
}
void reply(char *str)
@@ -74,6 +111,8 @@ unsigned int count = 0;
int main(void) {
init_uart();
init_i2c();
init_pins();
putstr("Your entire life has been a mathematical error... a mathematical error I'm about to correct!\r\n");
while (1) {
@@ -101,6 +140,49 @@ int main(void) {
case '?':
reply("Help is not available. Try a psychiatrist.");
break;
case 'R':
putstr("I2C register is: ");
puthex(i2c_conreg());
reply(".");
break;
case 'T':
putstr("I2C status was: ");
puthex(i2cstat);
putstr(" I2C status is: ");
puthex(i2c_statreg());
reply(".");
break;
case 'S':
putstr("Sending START... ");
if (i2c_send_start())
reply("OK");
else
reply("FAIL");
break;
case 'D':
putstr("Sending address... ");
if (i2c_send_address(0x53, TRUE))
reply("OK");
else
reply("FAIL");
break;
case 'B':
putstr("Sending bytes... ");
if (i2c_send_data(0xfe))
reply("OK");
else
reply("FAIL");
if (i2c_send_data(0x04))
reply("OK");
else
reply("FAIL");
break;
case 'O':
putstr("Sending STOP... ");
i2c_send_stop();
reply("sent");
break;
default:
reply("Unrecognised command.");
break;