aduino_main.cpp & main.c from RT-Thread ide project

ARDUINO_MAIN.CPP
============================
#include <Arduino.h>
#include <SmartDrive.h>

SmartDrive smd = SmartDrive(SmartDrive_DefaultAddress);

void setup(void)
{
    Serial.begin();
}

void loop(void)
{
      Serial.print("Motor powered: " + smd.IsMotorPowered(SmartDrive_Motor_ID_1));
   // smd.Run_Seconds(SmartDrive_Motor_ID_1, SmartDrive_Dir_Reverse, 90, 11, true, SmartDrive_Action_Brake);
     smd.Run_Unlimited(SmartDrive_Motor_ID_1, SmartDrive_Dir_Reverse, 90);
     smd.Run_Unlimited(SmartDrive_Motor_ID_2, SmartDrive_Dir_Forward, 90);
  // delay(5000);
}

MAINC.C 
==============
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>

/* defined the LED1 pin: PG6 */
#define LED4_PIN    GET_PIN(K, 3)

int main(void)
{
    /* set LED1 pin mode to output */
    rt_pin_mode(LED4_PIN, PIN_MODE_OUTPUT);

    while (1)
    {
        rt_pin_write(LED4_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED4_PIN, PIN_LOW);
        rt_thread_mdelay(500);
    }
}