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/* * 程序清单：跑马灯例程 * * 跑马灯大概是最简单的例子，就类似于每种编程语言中程序员接触的第一个程序 * Hello World一样，所以这个例子就从跑马灯开始。创建一个线程，让它定时地对 * LED进行更新（关或灭） */#include 
   
    #include 
    
     ALIGN(RT_ALIGN_SIZE)static rt_uint8_t led_stack[ 512 ];/* 线程的TCB控制块 */static struct rt_thread led_thread;void rt_hw_led_init(void){    rt_pin_mode(LED_0_PIN, PIN_MODE_INPUT);    rt_pin_mode(LED_1_PIN, PIN_MODE_INPUT);}void rt_hw_led_on(rt_uint32_t n){    switch (n)    {    case 0:        rt_pin_write(LED_0_PIN, 1);        break;    case 1:        rt_pin_write(LED_0_PIN, 1);        break;    default:        break;    }}void rt_hw_led_off(rt_uint32_t n){    switch (n)    {    case 0:        rt_pin_write(LED_0_PIN, 0);        break;    case 1:        rt_pin_write(LED_0_PIN, 0);        break;    default:        break;    }}static rt_uint8_t led_inited = 0;void led(rt_uint32_t led, rt_uint32_t value){    /* init led configuration if it's not inited. */    if (!led_inited)    {        rt_hw_led_init();        led_inited = 1;    }    if (led == 0)    {        /* set led status */        switch (value)        {        case 0:            rt_hw_led_off(0);            break;        case 1:            rt_hw_led_on(0);            break;        default:            break;        }    }    if (led == 1)    {        /* set led status */        switch (value)        {        case 0:            rt_hw_led_off(1);            break;        case 1:            rt_hw_led_on(1);            break;        default:            break;        }    }}static void led_thread_entry(void *parameter){    unsigned int count = 0;    rt_hw_led_init();    while (1)    {        /* led1 on */        rt_kprintf("led on, count : %d\r\n", count);        count++;        rt_hw_led_on(0);        rt_thread_delay(RT_TICK_PER_SECOND / 2); /* sleep 0.5 second and switch to other thread */        /* led1 off */        rt_kprintf("led off\r\n");        rt_hw_led_off(0);        rt_thread_delay(RT_TICK_PER_SECOND / 2);    }}int led_sample_init(void){    rt_err_t result;    /* init led thread */    result = rt_thread_init(&led_thread,                            "led",                            led_thread_entry,                            RT_NULL,                            (rt_uint8_t *)&led_stack[0],                            sizeof(led_stack),                            20,                            5);    if (result == RT_EOK)    {        rt_thread_startup(&led_thread);    }    return 0;}	/* 如果设置了RT_SAMPLES_AUTORUN，则加入到初始化线程中自动运行 */#if defined (RT_SAMPLES_AUTORUN) && defined(RT_USING_COMPONENTS_INIT)    INIT_APP_EXPORT(led_sample_init);#endif/* 导出到 msh 命令列表中 */MSH_CMD_EXPORT(led_sample_init, led sample);
    
   

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