RT-Thread的跑马灯

#define LED_PIN         GET_PIN(A, 7)
ALIGN(RT_ALIGN_SIZE)
static rt_uint8_t led_stack[512];
static struct rt_thread led_thread;
void rt_hw_led_init(void)
{
  rt_pin_mode(LED_PIN,PIN_MODE_OUTPUT);
}
static void led1_thread_entry(void *parameter)
{
  unsigned int count = 0;
  rt_hw_led_init();
  while(1){
    rt_kprintf("led on, count : %d\r\n", count);
    count++;
    rt_pin_write(LED_PIN, 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_pin_write(LED_PIN, 1);
    rt_thread_delay(RT_TICK_PER_SECOND / 2);
  }
}
int led1_sample_init(void)
{
  rt_err_t result;
  result = rt_thread_init(&led_thread,
  "led",led1_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;
}
MSH_CMD_EXPORT(led1_sample_init, led sample);