rt-thread系统连接STM32F401RCT6 PA1口LED，写程序控制该led

可以使用以下代码控制该LED：

#include "rtthread.h"
#include "board.h"

int main(void)
{
rt_pin_mode(LED_PIN, PIN_MODE_OUTPUT);

while (1)
{
rt_pin_write(LED_PIN, PIN_HIGH);
rt_thread_mdelay(500);
rt_pin_write(LED_PIN, PIN_LOW);
rt_thread_mdelay(500);
}
return RT_EOK;
}