Device won't wake up from light sleep with GPIO

Products & Technology XIAO
#1

I have a keymatrix as below

image
image970×588 13.2 KB

When the column pins are low and a button is pressed the row pins which are INPUT_PULLUP are pulled down.

Below sketch seems to suggest that even though I pull the row pins down, the device won’t wake up.

void sleepSetup() {
  // rows
  pinMode(GPIO_NUM_3, INPUT_PULLUP);
  pinMode(GPIO_NUM_4, INPUT_PULLUP);
  pinMode(GPIO_NUM_8, INPUT_PULLUP);
  pinMode(GPIO_NUM_9, INPUT_PULLUP);
  pinMode(GPIO_NUM_20, INPUT_PULLUP);
  gpio_wakeup_enable(GPIO_NUM_3, GPIO_INTR_LOW_LEVEL);
  gpio_wakeup_enable(GPIO_NUM_4, GPIO_INTR_LOW_LEVEL);
  gpio_wakeup_enable(GPIO_NUM_8, GPIO_INTR_LOW_LEVEL);
  gpio_wakeup_enable(GPIO_NUM_9, GPIO_INTR_LOW_LEVEL);
  gpio_wakeup_enable(GPIO_NUM_20, GPIO_INTR_LOW_LEVEL);
  gpio_hold_en(GPIO_NUM_3);
  gpio_hold_en(GPIO_NUM_4);
  gpio_hold_en(GPIO_NUM_8);
  gpio_hold_en(GPIO_NUM_9);
  gpio_hold_en(GPIO_NUM_20);

  // columns
  pinMode(GPIO_NUM_10, OUTPUT);
  pinMode(GPIO_NUM_21, OUTPUT);
  digitalWrite(GPIO_NUM_10, LOW);
  digitalWrite(GPIO_NUM_21, LOW);
  gpio_hold_en(GPIO_NUM_10);
  gpio_hold_en(GPIO_NUM_21);
}

void setup() {
  sleepSetup();
  Serial.begin(115200);
}

void loop() {
  delay(2000);
  Serial.println("will sleep");
  delay(10000);
  Serial.println("byeee");
  esp_light_sleep_start();
  Serial.println("woken up");
}
#2

Turns out I’m missing

  esp_sleep_enable_gpio_wakeup();