88 lines
2.1 KiB
C
88 lines
2.1 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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#include "../../bsp/include/pinmux.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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uart_tx_fifo_empty_int_enable(UART0, 1);
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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引脚配置
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pinmux_set_io0_func(IO0_UART0_TX);
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pinmux_set_io3_func(IO3_UART0_RX);
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// UART0初始化
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uart_init(UART0, uart_putc);
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// 使能RVIC中断
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rvic_irq_enable(RVIC_UART0_INT_ID);
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// 设置UART0中断优先级为1
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rvic_set_irq_prio_level(RVIC_UART0_INT_ID, 1);
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// 使能RX FIFO非空中断
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uart_rx_fifo_not_empty_int_enable(UART0, 1);
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// 使能全局中断
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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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// UART0中断处理函数
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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 (!uart_rx_fifo_empty(UART0)) {
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data = uart_get_rx_fifo_data(UART0);
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uart_set_tx_fifo_data(UART0, data);
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}
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// 如果TX FIFO为空
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if (uart_tx_fifo_empty(UART0) && (fifo.tct > 0)) {
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count = fifo.tct;
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if (count > UART_TX_FIFO_LEN)
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count = UART_TX_FIFO_LEN;
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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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// 发送数据
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uart_set_tx_fifo_data(UART0, fifo.tbuf[i]);
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fifo.tri = ++i % UART_TXB;
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}
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// 如果发完数据，则关闭TX FIFO空中断
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if (fifo.tct == 0)
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uart_tx_fifo_empty_int_enable(UART0, 0);
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}
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rvic_clear_irq_pending(RVIC_UART0_INT_ID);
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}
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