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193 lines
3.1 KiB
193 lines
3.1 KiB
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#include "i2c.h" |
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#define UARTBASE 0xE000C000 |
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#define RBR 0x00 |
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#define THR 0x00 |
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#define DLL 0x00 |
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#define DLM 0x04 |
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#define IER 0x04 |
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#define IIR 0x08 |
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#define FCR 0x08 |
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#define LCR 0x0c |
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#define LSR 0x14 |
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#define SCR 0x1c |
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#define ACR 0x20 |
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#define FDR 0x28 |
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#define TER 0x30 |
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#define UREG(x) (((volatile unsigned char *)UARTBASE)[x]) |
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#define U0THRE ((UREG(LSR) & (1<<5))) /* UART0 transmitter holding register is empty */ |
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#define U0DR ((UREG(LSR) & (1<<0))) /* UART0 data ready */ |
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#define I2CBASE 0xE001C000 |
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#define I2CONSET 0x00 |
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#define I2STAT 0x04 |
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#define I2DAT 0x08 |
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#define I2ADR 0x0c |
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#define I2SCLH 0x10 |
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#define I2SCLL 0x14 |
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#define I2CONCLR 0x18 |
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#define IREG(x) (((volatile unsigned char *)I2CBASE)[x]) |
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#define PINSEL0 (*((volatile unsigned char *) 0xE002C000)) |
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void init_uart(void) |
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{ |
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UREG(FDR) = 0x10; /* DivAddVal = 0, MulVal = 1 */ |
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UREG(LCR) = 0x80; |
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UREG(DLM) = 0x00; |
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UREG(DLL) = 0x08; /* 14745600 / (16*115200) */ |
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UREG(LCR) = 0x13; |
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UREG(FCR) = 0x07; |
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} |
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void init_pins(void) |
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{ |
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PINSEL0 = 0x00000055; /* P0.0 and P0.1 assigned to UART */ |
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/* P0.2 and P0.3 assigned to I2C */ |
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} |
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void putch(char c) { |
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while (!U0THRE); |
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UREG(THR) = c; |
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} |
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void putstr(char *s) { |
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while (*s) putch(*s++); |
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} |
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void putint(unsigned int n) { |
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char s[11]; |
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int i; |
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i = 10; |
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s[i] = '\0'; |
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do { |
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s[--i] = n % 10 + '0'; |
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} while ((n /= 10) > 0); |
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putstr(s+i); |
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} |
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void puthex(unsigned int n) { |
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char s[9]; |
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int i; |
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i = 8; |
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s[i] = '\0'; |
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do { |
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int x = n % 16; |
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if (x > 9) |
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x += 'A' - '0' - 10; |
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s[--i] = x + '0'; |
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} while ((n /= 16) > 0); |
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putstr(s+i); |
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} |
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char getch(void) { |
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while (!U0DR); |
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return UREG(RBR); |
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} |
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void reply(char *str) |
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{ |
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putstr(str); |
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putstr("\r\n"); |
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} |
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unsigned int count = 0; |
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int main(void) { |
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init_uart(); |
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init_i2c(); |
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init_pins(); |
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putstr("Your entire life has been a mathematical error... a mathematical error I'm about to correct!\r\n"); |
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while (1) { |
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char c; |
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putstr("prompt> "); |
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c = getch(); |
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if (c == 0x0a) |
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continue; |
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putch(c); |
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putstr("\r\n"); |
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switch (c & 0xdf) { |
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case 0x0a: |
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case 0x0d: |
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break; |
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case 'A': |
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reply("apple"); |
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break; |
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case 'C': |
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count++; |
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putstr("The current count is "); |
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putint(count); |
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reply("."); |
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break; |
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case 'H': |
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case '?': |
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reply("Help is not available. Try a psychiatrist."); |
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break; |
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case 'R': |
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putstr("I2C register is: "); |
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puthex(i2c_conreg()); |
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reply("."); |
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break; |
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case 'T': |
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putstr("I2C status was: "); |
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puthex(i2cstat); |
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putstr(" I2C status is: "); |
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puthex(i2c_statreg()); |
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reply("."); |
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break; |
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case 'S': |
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putstr("Sending START... "); |
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if (i2c_send_start()) |
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reply("OK"); |
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else |
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reply("FAIL"); |
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break; |
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case 'D': |
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putstr("Sending address... "); |
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if (i2c_send_address(0x53, TRUE)) |
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reply("OK"); |
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else |
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reply("FAIL"); |
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break; |
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case 'B': |
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putstr("Sending bytes... "); |
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if (i2c_send_data(0xfe)) |
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reply("OK"); |
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else |
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reply("FAIL"); |
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if (i2c_send_data(0x04)) |
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reply("OK"); |
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else |
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reply("FAIL"); |
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break; |
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case 'O': |
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putstr("Sending STOP... "); |
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i2c_send_stop(); |
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reply("sent"); |
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break; |
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default: |
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reply("Unrecognised command."); |
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break; |
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} |
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} |
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return 0; |
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}
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