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80 lines
1.2 KiB
80 lines
1.2 KiB
13 years ago
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#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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