两块STM32板子进行串口通信使用RT-Thread邮箱的例子

以下是两个STM32板子进行串口通信使用RT-Thread邮箱的例子：

首先，需要在两个板子上分别配置好串口和RT-Thread，然后在发送数据的板子上创建一个邮箱：

#include <rtthread.h>

#define MAILBOX_NAME "mailbox1"
#define MAILBOX_SIZE 10

static struct rt_mailbox mailbox;

void mailbox_sender_entry(void *parameter)
{
    char message[20] = "Hello, RT-Thread!";
    rt_uint32_t timeout = 50;
    
    while (1) {
        rt_err_t result = rt_mb_send(&mailbox, (rt_uint32_t)message, sizeof(message));
        if (result != RT_EOK) {
            rt_kprintf("Failed to send message to mailbox: %d\n", result);
        }
        
        rt_thread_mdelay(timeout);
    }
}

int mailbox_sender_init(void)
{
    rt_err_t result = rt_mb_init(&mailbox, MAILBOX_NAME, sizeof(char), MAILBOX_SIZE);
    if (result != RT_EOK) {
        rt_kprintf("Failed to initialize mailbox: %d\n", result);
        return -1;
    }
    
    rt_thread_t thread = rt_thread_create("mailbox_sender", mailbox_sender_entry, RT_NULL, 1024, 25, 10);
    if (thread != RT_NULL) {
        rt_thread_startup(thread);
    } else {
        rt_kprintf("Failed to create mailbox_sender thread\n");
        return -1;
    }
    
    return 0;
}

然后，在接收数据的板子上创建一个邮箱接收数据：

#include <rtthread.h>

#define MAILBOX_NAME "mailbox1"
#define MAILBOX_SIZE 10

static struct rt_mailbox mailbox;

void mailbox_receiver_entry(void *parameter)
{
    while (1) {
        char message[20];
        rt_err_t result = rt_mb_recv(&mailbox, (rt_uint32_t *)&message, RT_WAITING_FOREVER);
        if (result == RT_EOK) {
            rt_kprintf("Received message from mailbox: %s\n", message);
        } else {
            rt_kprintf("Failed to receive message from mailbox: %d\n", result);
        }
    }
}

int mailbox_receiver_init(void)
{
    rt_err_t result = rt_mb_init(&mailbox, MAILBOX_NAME, sizeof(char), MAILBOX_SIZE);
    if (result != RT_EOK) {
        rt_kprintf("Failed to initialize mailbox: %d\n", result);
        return -1;
    }
    
    rt_thread_t thread = rt_thread_create("mailbox_receiver", mailbox_receiver_entry, RT_NULL, 1024, 25, 10);
    if (thread != RT_NULL) {
        rt_thread_startup(thread);
    } else {
        rt_kprintf("Failed to create mailbox_receiver thread\n");
        return -1;
    }
    
    return 0;
}

最后，在两个板子上分别调用初始化函数即可：

int main(void)
{
    rt_thread_mdelay(5000);
    
    if (mailbox_sender_init() != 0) {
        rt_kprintf("Failed to initialize mailbox_sender\n");
    }
    
    if (mailbox_receiver_init() != 0) {
        rt_kprintf("Failed to initialize mailbox_receiver\n");
    }
    
    return 0;
}

这样，就可以在两个板子之间实现串口通信了。