/* main function 
, V1.0.0, firmware for GD32F1x0(x=3,5) , V2.0.0, firmware for GD32F1x0(x=3,5,7,9) , V3.0.0, firmware update for GD32F1x0(x=3,5,7,9) */
int main(void)
/* main function 
, V1.0.0, firmware for GD32F1x0(x=3,5) , V2.0.0, firmware for GD32F1x0(x=3,5,7,9) , V3.0.0, firmware update for GD32F1x0(x=3,5,7,9) */
int main(void)
{
    systick_config();
    gd_eval_ledinit(LED1);
    gd_eval_ledinit(LED2);
    gd_eval_ledinit(LED3);
    gd_eval_ledinit(LED4);
    while(1){
        gd_eval_ledon(LED1);
        gd_eval_ledoff(LED4);
        delay_1ms(1000);
        gd_eval_ledon(LED2);
        gd_eval_ledoff(LED1);
        delay_1ms(1000);
        gd_eval_ledon(LED3);
        gd_eval_ledoff(LED2);
        delay_1ms(1000);
        gd_eval_ledon(LED4);
        gd_eval_ledoff(LED3);
        delay_1ms(1000);
    }
}