77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include <stdint.h>
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#include "../../bsp/include/uart.h"
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#include "../../bsp/include/xprintf.h"
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#include "../../bsp/include/rvic.h"
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#include "../../bsp/include/utils.h"
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#define UART_TXB (80)
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static volatile struct {
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uint16_t tri, twi, tct;
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uint8_t tbuf[UART_TXB];
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} fifo;
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static void uart_putc(uint8_t c)
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{
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uint16_t i;
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if (fifo.tct >= UART_TXB)
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return;
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i = fifo.twi;
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fifo.tbuf[i] = c;
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fifo.twi = ++i % UART_TXB;
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global_irq_disable();
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fifo.tct++;
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// 使能TX FIFO空中断
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UART0_REG(UART_CTRL_REG_OFFSET) |= 1 << UART_CTRL_TX_FIFO_EMPTY_INT_EN_BIT;
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global_irq_enable();
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}
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int main()
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{
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uart0_init(uart_putc);
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rvic_irq_enable(1);
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rvic_set_irq_prio_level(1, 1);
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// 使能RX FIFO非空中断
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UART0_REG(UART_CTRL_REG_OFFSET) |= 1 << UART_CTRL_RX_FIFO_NOT_EMPTY_INT_EN_BIT;
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global_irq_enable();
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fifo.tri = 0; fifo.twi = 0; fifo.tct = 0;
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xprintf("uart interrupt test\n");
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while (1);
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}
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void uart0_irq_handler()
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{
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uint16_t i, count, index;
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uint8_t data;
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// 如果RX FIFO非空
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while (!(UART0_REG(UART_STATUS_REG_OFFSET) & (1 << UART_STATUS_RXEMPTY_BIT))) {
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data = UART0_REG(UART_RXDATA_REG_OFFSET);
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UART0_REG(UART_TXDATA_REG_OFFSET) = data;
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}
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// 如果TX FIFO为空
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if ((UART0_REG(UART_STATUS_REG_OFFSET) & (1 << UART_STATUS_TXEMPTY_BIT)) &&
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(fifo.tct > 0)) {
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count = fifo.tct;
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if (count > 8)
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count = 8;
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for (index = 0; index < count; index++) {
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fifo.tct--;
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i = fifo.tri;
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UART0_REG(UART_TXDATA_REG_OFFSET) = fifo.tbuf[i];
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fifo.tri = ++i % UART_TXB;
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}
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if (fifo.tct == 0)
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UART0_REG(UART_CTRL_REG_OFFSET) &= ~(1 << UART_CTRL_TX_FIFO_EMPTY_INT_EN_BIT);
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}
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rvic_clear_irq_pending(1);
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}
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