test-example-projects/qt_projects/rt-thread-master/bsp/zynqmp-r5-axu4ev/applications/main.c

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

#define LED_PIN    40
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;
}