用RT-thread studio创建一个利用互斥量实现流水灯的线程

1. 打开RT-thread studio，点击新建项目，选择RT-thread项目模板，填写项目名称、路径等信息，创建一个新项目。

2. 在项目文件夹下创建一个新文件，命名为led_thread.c，用于编写流水灯线程代码。

3. 在led_thread.c中引入头文件，包括rtthread.h和rtdevice.h。

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

4. 定义一个互斥量，用于控制LED灯的互斥访问。

static rt_mutex_t led_mutex;

5. 在线程函数led_thread中初始化互斥量，并循环实现流水灯的效果。

void led_thread(void *parameter)
{
    rt_mutex_init(&led_mutex, "led_mutex", RT_IPC_FLAG_FIFO);

    while(1)
    {
        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯亮起 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯熄灭 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯亮起 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯熄灭 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);
    }
}

6. 在main函数中创建led_thread线程并启动。

int main(void)
{
    rt_thread_t tid;

    tid = rt_thread_create("led", led_thread, RT_NULL, 512, 25, 5);
    if (tid != RT_NULL)
        rt_thread_startup(tid);

    return 0;
}

7. 编译代码并下载到开发板中运行，即可看到流水灯的效果。

完整代码如下：

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

static rt_mutex_t led_mutex;

void led_thread(void *parameter)
{
    rt_mutex_init(&led_mutex, "led_mutex", RT_IPC_FLAG_FIFO);

    while(1)
    {
        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯亮起 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯熄灭 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯亮起 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);

        rt_mutex_take(&led_mutex, RT_WAITING_FOREVER);
        /* 控制LED灯熄灭 */
        rt_mutex_release(&led_mutex);
        rt_thread_delay(1000);
    }
}

int main(void)
{
    rt_thread_t tid;

    tid = rt_thread_create("led", led_thread, RT_NULL, 512, 25, 5);
    if (tid != RT_NULL)
        rt_thread_startup(tid);

    return 0;
}