add code for feather esp32-s2 (both versions)

Author: ladyada

Adafruit_ESP32_Arduino_Demos/ESP32_sleeptest/ESP32_sleeptest.ino

@@ -51,11 +51,29 @@ void enableInternalPower() {
   pinMode(NEOPIXEL_POWER, OUTPUT);
   digitalWrite(NEOPIXEL_POWER, HIGH);
 #endif
+
+#if defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
+  // turn on the I2C power by setting pin to opposite of 'rest state'
+  pinMode(PIN_I2C_POWER, INPUT);
+  delay(1);
+  bool polarity = digitalRead(PIN_I2C_POWER);
+  pinMode(PIN_I2C_POWER, OUTPUT);
+  digitalWrite(PIN_I2C_POWER, !polarity);
+  pinMode(NEOPIXEL_POWER, OUTPUT);
+  digitalWrite(NEOPIXEL_POWER, HIGH);
+#endif
 }
 
 void disableInternalPower() {
 #if defined(ARDUINO_ADAFRUIT_QTPY_ESP32_PICO)
   pinMode(NEOPIXEL_POWER, OUTPUT);
   digitalWrite(NEOPIXEL_POWER, LOW);
 #endif
+
+#if defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
+  // turn on the I2C power by setting pin to rest state (off)
+  pinMode(PIN_I2C_POWER, INPUT);
+  pinMode(NEOPIXEL_POWER, OUTPUT);
+  digitalWrite(NEOPIXEL_POWER, LOW);
+#endif
 }