K210应用5-使用中断方式通过UART接收数据

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#include <fpioa.h>
#include <gpiohs.h>
#include <uart.h>
#include <plic.h>
#include <sysctl.h>
#include <stdio.h>
#include <sleep.h>

#define LED_R_PIN  (12)
#define LED_R_GPIOHSNUM (0)
#define LED_R_FUNC (FUNC_GPIOHS0+LED_R_GPIOHSNUM)

#define UART3_RX_PIN (4)
#define UART3_TX_PIN (5)
#define UART3_NUM (UART_DEVICE_3)
#define UART3_RX_FUNC (FUNC_UART1_RX+UART3_NUM*2)
#define UART3_TX_FUNC (FUNC_UART1_TX+UART3_NUM*2)

/*********************************
 * 管脚功能初始化
 ********************************/
void init_hardware(void)
{
    // 将红色LED管脚设置复用为GPIOHS
    fpioa_set_function(LED_R_PIN, LED_R_FUNC);
    // 将UART管脚设置复用为UART
    fpioa_set_function(UART3_RX_PIN, UART3_RX_FUNC);
    fpioa_set_function(UART3_TX_PIN, UART3_TX_FUNC);
}
/*********************************
 * LED初始化
 ********************************/
void init_led(gpio_pin_value_t value)
{
    // 设置输出
    gpiohs_set_drive_mode(LED_R_GPIOHSNUM, GPIO_DM_OUTPUT);
    // 设置初始电平状态
    gpiohs_set_pin(LED_R_GPIOHSNUM, value);
}
/*********************************
 * 控制LED亮灭
 ********************************/
void ctl_led(gpio_pin_value_t value)
{
    gpiohs_set_pin(LED_R_GPIOHSNUM, value);
}

struct RCVBUF {
    char buf[128];
    unsigned char len;
};
/*********************************
 * UART接收中断回调函数
 ********************************/
int irq_uart3_rcv(void *ctx)
{
    struct RCVBUF *rcv_buf = (struct RCVBUF *)ctx;
    rcv_buf->len = uart_receive_data(UART3_NUM, rcv_buf->buf, 1);

    return 0;
}
/*********************************
 * UART初始化
 ********************************/
void init_uart(struct RCVBUF *rcv_buf)
{
    // 初始化 uart
    uart_init(UART3_NUM);
    // 设置 uart 工作模式
    uart_set_work_mode (UART3_NUM , UART_NORMAL);
    // 设置 UART 相关参数
    uart_config (UART3_NUM , 115200 , UART_BITWIDTH_8BIT , UART_STOP_1 , UART_PARITY_NONE);

    // 初始化外部中断
    plic_init();
    // 注册 UART 中断函数
    uart_irq_register (UART3_NUM, UART_RECEIVE, irq_uart3_rcv, rcv_buf , 1);
    // 设置接收中断 触发 FIFO 深度
    uart_set_receive_trigger(UART3_NUM, UART_RECEIVE_FIFO_1);
     // 使能系统中断，如果使用中断，一定要开启系统中断
    sysctl_enable_irq();
}

int main(int argc, char **argv)
{
    init_hardware();
    init_led(GPIO_PV_HIGH);
    struct RCVBUF rcv_buf = {
        .len = 0,
    };
    init_uart(&rcv_buf);
    uart_send_data(UART3_NUM, "CTL LED:[0:OFF/1:ON] rn", sizeof("CTL LED:[0:OFF/1:ON] rn"));
    while (1)
    {
        if(rcv_buf.len != 0)
        {
            uart_send_data(UART3_NUM, "rcv_buf.len:", sizeof("rcv_buf.len:"));
            uart_send_data(UART3_NUM, (char *)&rcv_buf.len, sizeof(rcv_buf.len));
            if(rcv_buf.buf[0] == 0)
            {
                uart_send_data(UART3_NUM, "LER_R OFF! rn", sizeof("LER_R OFF! rn"));
                ctl_led(GPIO_PV_HIGH);
            }
            else
            {
                uart_send_data(UART3_NUM, "LER_R ON! rn", sizeof("LER_R ON! rn"));
                ctl_led(GPIO_PV_LOW);
            }
            uart_send_data(UART3_NUM, "CTL LED:[0:OFF/1:ON] rn", sizeof("CTL LED:[0:OFF/1:ON] rn"));
            rcv_buf.len = 0;
        }
        usleep(20000);  
    }
    return 0;
}