Use keypad for wakeup (kbd_matrix) from deep sleep (sys_poweroff)

Question

I am having issues using a keypad to wakeup an nrf52840 and am unclear on if the GPIO sample is relevant if using a kbd_matrix device definition. I would like to use "sys_poweroff()" for power savings but have not been able to wake it up again. Is it possible to use this device? Do I need to change to a GPIO interrupt or something? Currently, a callback is registered for the keypad events: INPUT_CALLBACK_DEFINE(DEVICE_DT_GET(DT_NODELABEL(keymap)), input_button_raw_cb); I have added "wakeup-source" to the device tree and the definition is: kbd_matrix: kbd_matrix { compatible = "gpio-kbd-matrix"; zephyr,deferred-init; // Init at runtime depending on the board wakeup-source; row-gpios = <&gpio1 1 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>, <&gpio1 2 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>, <&gpio1 3 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>, <&gpio1 4 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>; col-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>, <&gpio1 6 GPIO_ACTIVE_LOW>, <&gpio1 7 GPIO_ACTIVE_LOW>; keymap: keymap { compatible = "input-keymap"; keymap = < MATRIX_KEY(3, 0, 100) MATRIX_KEY(3, 1, 101) MATRIX_KEY(3, 2, 102) MATRIX_KEY(2, 0, 103) MATRIX_KEY(2, 1, 104) MATRIX_KEY(2, 2, 105) MATRIX_KEY(1, 0, 106) MATRIX_KEY(1, 1, 107) MATRIX_KEY(1, 2, 108) MATRIX_KEY(0, 0, 109) MATRIX_KEY(0, 1, 110) MATRIX_KEY(0, 2, 111) >; row-size = <4>; col-size = <3>; }; };

Kenneth · Accepted Answer

Hi, 
 For low power interrupt and wakeup, I recommend to use sense-edge-mask for those pins, e.g.: 
 &gpio0 { // Depend on the port. 
 ... 
 sense-edge-mask = <0xFFFFFFFF>; // Set to "1" for those pins that are used for interrupt and wakeup. 
 }; 
 Can you try this? 
 Kenneth

Use keypad for wakeup (kbd_matrix) from deep sleep (sys_poweroff)

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