XIAO ESP32S3 Deep Sleep with XIAO Expansion Board

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Hi PJ_Glasso,
Thanks for the response, I have managed to look into the documentation a bit more and found out that the RTC GPIO Pin needs to be pulled up or down using the rtc_gpio_pullup_en commands instead of the pinmode way. I have attached the code that allowed me to perform deep sleep with the push button.

#include "driver/rtc_io.h"

const gpio_num_t WAKEUP_BUTTON_PIN = GPIO_NUM_2; // Define GPIO_NUM_2 as a const

RTC_DATA_ATTR int bootCount = 0;

void print_wakeup_reason(){
  esp_sleep_wakeup_cause_t wakeup_reason;

  wakeup_reason = esp_sleep_get_wakeup_cause();

  switch(wakeup_reason)
  {
    case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
    case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
    case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
    case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
    case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
    default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
  }
}

void setup(){
  Serial.begin(115200);
  delay(1000); //Take some time to open up the Serial Monitor

  //Increment boot number and print it every reboot
  ++bootCount;
  Serial.println("Boot number: " + String(bootCount));

  //Print the wakeup reason for ESP32
  print_wakeup_reason();

  rtc_gpio_pullup_en(WAKEUP_BUTTON_PIN); // Use the const here
  rtc_gpio_pulldown_dis(WAKEUP_BUTTON_PIN); // Use the const here
  esp_sleep_enable_ext0_wakeup(WAKEUP_BUTTON_PIN, 0);   // When the button is pressed, wake up

  //Go to sleep now
  Serial.println("Going to sleep now");
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
}

void loop(){
  //This is not going to be called
}
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