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79 lines
1.2 KiB
79 lines
1.2 KiB
#include "uart.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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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 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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