esp32 gpio matrix

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        Hi Guys,
this is my first forum thread.
If I am doing something against the forum rules, please inform me and I will correct it.

My difficulty is  ESP32 port manipulation .

I'm using a DOIT ESP32 DEVKIT V1 board with the arduino IDE.

For write a sketch I got information from the 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).

I wrote this test sketch.

 void setup ()
  {
  REG_WRITE (GPIO_ENABLE_REG, BIT13); // Define GPIO13 as output
  REG_WRITE (GPIO_FUNC2_OUT_SEL_CFG_REG, 0x100); // Special peripheral index value (0x100)
  REG_WRITE (GPIO_ENABLE_REG, BIT2); // Define GPIO2 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);
}

In this way it works normally and the BUILT_IN LED blinks.

But if I change the setup () lines , spinning as below, doesn't work.

  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 GPI13 as output
  REG_WRITE (GPIO_FUNC13_OUT_SEL_CFG_REG, 0x100); // Special peripheral index value (0x100)

I ask where I'm going wrong.
Best regards
mRV