stm32的rtthread 双串口程序

以下是一个基于STM32和RT-Thread操作系统的双串口程序示例：

#include <rtthread.h>
#include <rtdevice.h>

#define USART1_CONFIG \
{ \
    .name = "uart1", \
    .parent_name = "serial", \
    .open_flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX, \
    .close_flag = 0, \
    .read = rt_serial_read, \
    .write = rt_serial_write, \
    .control = rt_serial_control \
}

#define USART2_CONFIG \
{ \
    .name = "uart2", \
    .parent_name = "serial", \
    .open_flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX, \
    .close_flag = 0, \
    .read = rt_serial_read, \
    .write = rt_serial_write, \
    .control = rt_serial_control \
}

static struct rt_serial_configure usart1_config = RT_SERIAL_CONFIG_DEFAULT;
static struct rt_serial_configure usart2_config = RT_SERIAL_CONFIG_DEFAULT;

rt_err_t usart1_rx_ind(rt_device_t dev, rt_size_t size)
{
    /* do something when receive interrupt happens */
}

rt_err_t usart2_rx_ind(rt_device_t dev, rt_size_t size)
{
    /* do something when receive interrupt happens */
}

void usart1_tx_complete(void *arg)
{
    /* do something when transmit complete interrupt happens */
}

void usart2_tx_complete(void *arg)
{
    /* do something when transmit complete interrupt happens */
}

int main(void)
{
    rt_device_t usart1, usart2;

    /* initialize USART1 and USART2 configurations */
    usart1_config.baud_rate = 115200;
    usart2_config.baud_rate = 9600;

    /* register USART1 and USART2 devices */
    usart1 = rt_serial_register(&USART1_CONFIG, &usart1_config);
    usart2 = rt_serial_register(&USART2_CONFIG, &usart2_config);

    /* set interrupt callback functions for USART1 and USART2 receive events */
    rt_device_set_rx_indicate(usart1, usart1_rx_ind);
    rt_device_set_rx_indicate(usart2, usart2_rx_ind);

    /* set interrupt callback functions for USART1 and USART2 transmit events */
    rt_device_set_tx_complete(usart1, usart1_tx_complete);
    rt_device_set_tx_complete(usart2, usart2_tx_complete);

    /* open USART1 and USART2 devices */
    rt_device_open(usart1, RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX);
    rt_device_open(usart2, RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_INT_TX);

    while (1) {
        /* do something */
    }
}

在这个示例中，首先定义了两个串口设备的配置信息结构体 `usart1_config` 和 `usart2_config`，分别对应 USART1 和 USART2。然后使用 `rt_serial_register` 函数注册这两个串口设备，并设置接收和发送的回调函数。最后使用 `rt_device_open` 函数打开两个串口设备，开始接收和发送数据。在主循环中，可以执行其他任务。

需要注意的是，在此示例中，串口设备的父节点为 "serial"，因此需要先在RT-Thread的设备管理器中注册一个名为 "serial" 的设备，才能注册和打开 USART1 和 USART2 等串口设备。

此外，还需要根据实际情况修改串口的波特率、数据位、停止位、校验位等参数。