串口设备开放RT_thread移植到STM32F407ZGT6

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实现串口uart1的中断接收（PA9、PA10）

开放出串口1的接口，串口1接收到数据后进入线程
调试串口是uart2，PA2、PA3

一、串口uart1开发

1. 寻找设备

/寻找设备****/
u1_dev = rt_device_find(“uart1”);

 rt_err_t ret=0;
      u1_dev = rt_device_find("uart1");
      if(u1_dev==RT_NULL)
        {
          LOG_E("rt_device_find[uart1] failed...\n");
          return -EINVAL;
        }

2.打开设备

/打开设备****/
ret=rt_device_open(u1_dev, RT_DEVICE_OFLAG_RDWR|RT_DEVICE_FLAG_INT_RX);

ret=rt_device_open(u1_dev, RT_DEVICE_OFLAG_RDWR|RT_DEVICE_FLAG_INT_RX);
     if(ret<0)
      {
                LOG_E("rt_device_find[uart1] failed...\n");
                return ret;
      }

3.控制设备(设置波特率、数据位、停止位等)

/控制设备（配置设备）*****/

rt_device_control(u1_dev, RT_DEVICE_CTRL_CONFIG , (void *)&u1_configs);

4.设置接收回调函数

/****设置接收回调函数/
rt_device_set_rx_indicate(u1_dev, rx_callback) ;
串口接收到数据后调用回调函数，在回调函数中释放信号量

/**********串口接收到数据后调用回调函数，在回调函数中释放信号量***********/
rt_err_t rx_callback(rt_device_t dev, rt_size_t size)
{
    rt_sem_release(&sem);
    return RT_EOK;

}

5.设置信号量

/****设置信号量/
rt_sem_init(&sem, “rx_sem”, 0, RT_IPC_FLAG_FIFO);

6.创建串口线程

u1_th=rt_thread_create(“serial1_recv”, serial_thread_entry, NULL, 1024, 10, 5);
开启线程 rt_thread_startup(u1_th);
在串口线程中一直等待信号量的释放

/*******************************在串口线程中一直等待信号量的释放***************************/
void serial_thread_entry(void *parameter)
{
    char buffer;
    while(1)
    {
        while(rt_device_read(u1_dev,0,&buffer,1)!=1)//接收一个就触发一次中断
        {
            rt_sem_take(&sem, RT_WAITING_FOREVER);
        }
        rt_kprintf("%c",buffer);
        rt_pin_write(LED0_PIN, 0);
        rt_thread_delay(1000);
        rt_pin_write(LED0_PIN, 1);
    }

}

二、完整代码

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-12-11     RT-Thread    first version
 */

#include <rtthread.h>

#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>

#include <drv_common.h>
#include <drivers/pin.h>

#define LED0_PIN GET_PIN(F,9)

rt_device_t u1_dev;
rt_thread_t u1_th;
struct rt_semaphore sem;
struct serial_configure u1_configs = RT_SERIAL_CONFIG_DEFAULT;
/*******************************串口接收到数据后调用回调函数，在回调函数中释放信号量***************************/
rt_err_t rx_callback(rt_device_t dev, rt_size_t size)
{
    rt_sem_release(&sem);
    return RT_EOK;

}
/*******************************在串口线程中一直等待信号量的释放***************************/
void serial_thread_entry(void *parameter)
{
    char buffer;
    while(1)
    {
        while(rt_device_read(u1_dev,0,&buffer,1)!=1)//接收一个就触发一次中断
        {
            rt_sem_take(&sem, RT_WAITING_FOREVER);
        }
        rt_kprintf("%c",buffer);
        rt_pin_write(LED0_PIN, 0);
        rt_thread_delay(1000);
        rt_pin_write(LED0_PIN, 1);
    }

}

int main(void)
{
    /*******************寻找设备***********************/
      rt_err_t ret=0;
      u1_dev = rt_device_find("uart1");
      if(u1_dev==RT_NULL)
        {
          LOG_E("rt_device_find[uart1] failed...\n");
          return -EINVAL;
        }
    /*******************打开设备***********************/
     ret=rt_device_open(u1_dev, RT_DEVICE_OFLAG_RDWR|RT_DEVICE_FLAG_INT_RX);
     if(ret<0)
      {
                LOG_E("rt_device_find[uart1] failed...\n");
                return ret;
      }
     /******************控制设备***********************/
    rt_device_control(u1_dev, RT_DEVICE_CTRL_CONFIG , (void *)&u1_configs);

   /*******************************设置接收回调函数***************************/
    rt_device_set_rx_indicate(u1_dev, rx_callback)  ;
    /*******************************设置信号量***************************/
    rt_sem_init(&sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
    /*******************************创建串口线程***************************/
    u1_th=rt_thread_create("serial1_recv", serial_thread_entry, NULL, 1024, 10, 5);
    rt_thread_startup(u1_th);

    //rt_device_write(u1_dev, 0, "Uart1 config\n", rt_strlen("Uart1 config\n"));

    rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT);



    LOG_D("Hello RT-Thread!");

    return RT_EOK;
}

三、调试