uart_sample.c 中，uart_input()函数没有执行

发布于 2022-01-21 15:37:18 浏览：701 订阅该版

2 个回答

Sen 2022-01-21

这家伙很懒，什么也没写！

#include <rtthread.h>
#include "test_config.h"
#include <rtdevice.h>
#define UART_DEMO_TEST
#ifdef UART_DEMO_TEST
#define SAMPLE_UART_NAME "uart1"
/* 用于接收消息的信号量*/
static struct rt_semaphore rx_sem;
static rt_device_t serial;

/* 接收数据回调函数*/
static rt_err_t uart_input(rt_device_t dev, rt_size_t size) 
{
    /* 串口接收到数据后产生中断， 调用此回调函数， 然后发送接收信号量*/
    rt_kprintf("======= sem_release ! ======= \n");
    rt_sem_release(&rx_sem);
    return RT_EOK;
}

static void serial_thread_entry(void *parameter) 
{
    char ch;
    /* 从串口读取一个字节的数据， 没有读取到则等待接收信号量*/
    while (rt_device_read(serial, 0, &ch, 1) != 1) 
    {
        /* 阻塞等待接收信号量， 等到信号量后再次读取数据*/
        rt_kprintf("======= sem_take !! ======= \n");
        rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
    }
    rt_kprintf("======= ch++  ======= \n");
    ch = ch + 1;
    rt_device_write(serial, 0, &ch, 1);
}

static int uart_sample(int argc, char *argv[]) 
{
    rt_err_t ret = RT_EOK;
    char uart_name[RT_NAME_MAX];
    char str[] = "hello BK72xx!\r\n";
	struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

if (argc == 2) 
    {
        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
    }
    else  
    {
        rt_strncpy(uart_name, SAMPLE_UART_NAME , RT_NAME_MAX);
    }
    
    /* 查找系统中的串口设备*/
    serial = rt_device_find(uart_name);
    if (!serial) {
        rt_kprintf("find %s failed!\n", uart_name);
        return RT_ERROR;
    }
    rt_kprintf("==========  test  =========== \n");

rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
    /* 以中断接收及轮询发送模式打开串口设备*/
    rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
    // rt_device_open(serial, RT_DEVICE_FLAG_INT_TX);
    /* 设置接收回调函数*/
    ret = rt_device_set_rx_indicate(serial, uart_input);
    if(ret != RT_EOK){
        rt_kprintf("rx_indicate failed !!");
    }

/* 设置配置参数 */
    config.baud_rate = BAUD_RATE_115200;
    config.data_bits = DATA_BITS_8;
    config.stop_bits = STOP_BITS_1;
    config.parity = PARITY_NONE;
    config.bufsz = 2048;        /*can not change buffer size, must be 2048*/
    /* 打开设备后才可修改串口配置参数 */
    rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

rt_device_write(serial, 0, str, (sizeof(str) - 1));

rt_thread_t thread = rt_thread_create("serial", serial_thread_entry , RT_NULL,1024, 25, 10);
    if (thread != RT_NULL) {
        rt_thread_startup(thread);
    }
    else {
        ret = RT_ERROR;
    }
    return ret;
}
/* 导出到msh 命令列表中*/
MSH_CMD_EXPORT(uart_sample, uart device sample);
#endif