//  ESP32   Technical Reference Manual  Version 4.2
//
//  5.3.3 Simple GPIO Output
//
//  The GPIO Matrix can also be used for simple GPIO output –
//    setting a bit in the GPIO_OUT_DATA register will
//  write to the corresponding GPIO pad.
//  To configure a pad as simple GPIO output, the GPIO Matrix GPIO_FUNCx_OUT_SEL
//    register is configured with a special peripheral index value (0x100).
//---------------------------------------------------------------------------------
void setup()
{
  // pinMode(2, OUTPUT);
  // pinMode(13,OUTPUT);
  REG_WRITE(GPIO_ENABLE_REG, BIT2);                 //Define GPIO2 as output
  REG_WRITE(GPIO_FUNC2_OUT_SEL_CFG_REG, 0x100);     //Special peripheral index value (0x100)
  //REG_WRITE(GPIO_ENABLE_REG, BIT13);                //Define GPIO13 as output
  //REG_WRITE(GPIO_FUNC13_OUT_SEL_CFG_REG, 0x100);    //Special peripheral index value (0x100)
}
//---------------------------------------------------------------------------------
void loop()
{
  REG_WRITE(GPIO_OUT_W1TS_REG, BIT2);                    //GPIO2 HIGH (set)
  REG_WRITE(GPIO_OUT_W1TS_REG, BIT13);                   //GPIO13 HIGH (set)
  delay(50);
  REG_WRITE(GPIO_OUT_W1TC_REG, BIT2);                    //GPIO2 LOW (clear)
  REG_WRITE(GPIO_OUT_W1TS_REG, BIT13);                   //GPIO13 LOW (clear)
  delay(50);
}