Wake up using button A or button b

irokoi

Hey, i try to wakeup m5stickc from deepsleep using button A or B with this function : esp_sleep_enable_ext1_wakeup with ESP_EXT1_WAKEUP_ANY_HIGH mode. Problem encountered is that A and B button have pullup enabled.

Im aware that A and B button pull their respective GPIO low when pressed. How to activated pulldown for these buttons? i can't use ESP_EXT1_WAKEUP_ALL_LOW mode because wake up enabled when all GPIOs are low...

gpio_pulldown_en(); has no effect!

This is my code:

#define BUTTON_PIN_BITMASK (BIT64(GPIO_NUM_37)| BIT64(GPIO_NUM_39))

int bootCount = 0;

/*
Method to print the reason by which ESP32
has been awaken from sleep
*/
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;
  }
}

/*
Method to print the GPIO that triggered the wakeup
*/
void print_GPIO_wake_up(){
  uint64_t GPIO_reason = esp_sleep_get_ext1_wakeup_status();
  Serial.print("GPIO that triggered the wake up: GPIO ");
  Serial.println((log(GPIO_reason))/log(2), 0);
}
  
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();

  //Print the GPIO used to wake up
  print_GPIO_wake_up();

  /*
  First we configure the wake up source
  We set our ESP32 to wake up for an external trigger.
  There are two types for ESP32, ext0 and ext1 .
  ext0 uses RTC_IO to wakeup thus requires RTC peripherals
  to be on while ext1 uses RTC Controller so doesnt need
  peripherals to be powered on.
  Note that using internal pullups/pulldowns also requires
  RTC peripherals to be turned on.
  */
  
  gpio_pulldown_en(GPIO_NUM_39);
  gpio_pulldown_en(GPIO_NUM_37);
  gpio_pullup_dis(GPIO_NUM_39);
  gpio_pullup_dis(GPIO_NUM_37);
  //If you were to use ext1, you would use it like
  esp_sleep_enable_ext1_wakeup(BUTTON_PIN_BITMASK,ESP_EXT1_WAKEUP_ANY_HIGH);//ESP_EXT1_WAKEUP_ANY_HIGH  ESP_EXT1_WAKEUP_ALL_LOW
  //Go to sleep now
  Serial.println("Going to sleep now");
  delay(1000);
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
}

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

Thanks for your help

felmue

Hello @irokoi

have you considered using ext0 instead? E.g.

esp_sleep_enable_ext0_wakeup(GPIO_NUM_37, LOW);
esp_sleep_enable_ext0_wakeup(GPIO_NUM_39, LOW);

Thanks
Felix

irokoi

thanks, I think it's the only solution ;)