#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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void uart_init(void)
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void uart_init(void)
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{
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{
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int divisor;
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int divisor;
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/* Reset receiver and transmiter */
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/* Reset receiver and transmiter */
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REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14;
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REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14;
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/* Disable all interrupts */
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/* Disable all interrupts */
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REG8(UART_BASE + UART_IER) = 0x00;
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REG8(UART_BASE + UART_IER) = 0x00;
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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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}
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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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{
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{
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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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{
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{
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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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