#include <rtthread.h>
#include <rtdevice.h>
int main(void)
{
    rt_base_t led=34;
    int count=0;
    rt_pin_mode(led, PIN_MODE_OUTPUT);
    while (1)
    {
        rt_kprintf("Count = %d\n",count);
        rt_pin_write(led, count++%2);
        rt_thread_mdelay(500);
    }
    return 0;
}