#include "support.h"
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#include "support.h"
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#include "board.h"
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#include "board.h"
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#include "uart.h"
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#include "uart.h"
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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#define WAIT_FOR_XMITR \
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#define WAIT_FOR_XMITR \
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do { \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
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} while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
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#define WAIT_FOR_THRE \
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#define WAIT_FOR_THRE \
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do { \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)
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} while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)
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#define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR)
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#define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR)
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#define WAIT_FOR_CHAR \
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#define WAIT_FOR_CHAR \
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do { \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & UART_LSR_DR) != UART_LSR_DR)
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} while ((lsr & UART_LSR_DR) != UART_LSR_DR)
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#define UART_TX_BUFF_LEN 32
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#define UART_TX_BUFF_LEN 32
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#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)
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#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)
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void uart_init(void) {
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void uart_init(void) {
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int divisor;
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int divisor;
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/* Diable interrupt */
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/* Diable interrupt */
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REG8(UART_BASE + UART_IER) = 0x0;
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REG8(UART_BASE + UART_IER) = 0x0;
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/* Reset receiver and transmiter */
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/* Reset receiver and transmiter */
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/* Set RX interrupt for each byte */
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/* Set RX interrupt for each byte */
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REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1;
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REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1;
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/* Enable RX interrupt */
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REG8(UART_BASE + UART_IER) = UART_IER_RDI | UART_IER_THRI;
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/* Set 8 bit char, 1 stop bit, no parity */
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/* Set 8 bit char, 1 stop bit, no parity */
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REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
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REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
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/* Set baud rate */
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/* Set baud rate */
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divisor = IN_CLK / (16 * UART_BAUD_RATE);
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divisor = IN_CLK / (16 * UART_BAUD_RATE);
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REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB;
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REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB;
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REG8(UART_BASE + UART_DLL) = divisor & 0x000000ff;
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REG8(UART_BASE + UART_DLL) = divisor & 0x000000ff;
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REG8(UART_BASE + UART_DLM) = (divisor >> 8) & 0x000000ff;
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REG8(UART_BASE + UART_DLM) = (divisor >> 8) & 0x000000ff;
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REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB);
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REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB);
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return;
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return;
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}
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}
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void uart_putc(char c) {
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void uart_putc(char c) {
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unsigned char lsr;
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unsigned char lsr;
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WAIT_FOR_THRE;
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WAIT_FOR_THRE;
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REG8(UART_BASE + UART_TX) = c;
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REG8(UART_BASE + UART_TX) = c;
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if(c == '\n') {
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if(c == '\n') {
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WAIT_FOR_THRE;
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WAIT_FOR_THRE;
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REG8(UART_BASE + UART_TX) = '\r';
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REG8(UART_BASE + UART_TX) = '\r';
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}
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}
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WAIT_FOR_XMITR;
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WAIT_FOR_XMITR;
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}
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}
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char uart_getc(void) {
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char uart_getc(void) {
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unsigned char lsr;
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unsigned char lsr;
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char c;
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char c;
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WAIT_FOR_CHAR;
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WAIT_FOR_CHAR;
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c = REG8(UART_BASE + UART_RX);
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c = REG8(UART_BASE + UART_RX);
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return c;
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return c;
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}
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}
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void uart_print_str(char *p) {
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void uart_print_str(char *p) {
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while(*p != 0) {
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while(*p != 0) {
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uart_putc(*p);
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uart_putc(*p);
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p++;
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p++;
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}
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}
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}
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}
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void uart_put_int(int n) {
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void uart_print_int(int n) {
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int a;
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int a;
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char c;
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char c;
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if (n<0) {
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if (n<0) {
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uart_putc('-');
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uart_putc('-');
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n = -n;
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n = -n;
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}
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}
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a = n/10;
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a = n/10;
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if(a) uart_put_int(a);
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if(a) uart_print_int(a);
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c = '0' + (n % 10);
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c = '0' + (n % 10);
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uart_putc(c);
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uart_putc(c);
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}
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}
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