nrf52840 cannot wake up from sleep mode.

RE: nrf52840 cannot wake up from sleep mode.

Sigurd — Wed, 18 Jan 2023 09:31:38 GMT

[quote user="lerrywu"]nrf_gpio_cfg_sense_input(0x21, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW)[/quote]

If you ground pin P1.1 this should have waken up the chip. (HEX 0x21 is DEC 33. I recommend using NRF_GPIO_PIN_MAP(port,pin) here )

[quote user="lerrywu"]Is it correct to define BTN_ID_WAKEUP as 0?[/quote]

Yes, but then you should use this API to set the pin as wake-up pin: bsp_wakeup_button_enable().

Take a look at e.g. this example on how to use it: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/pwr_mgmt_example.html

Button id 0 is default pin 11 on the nRF52840-DK.

from pca10056.h

RE: nrf52840 cannot wake up from sleep mode.

Ted — Wed, 18 Jan 2023 02:20:22 GMT

Hi Sigurd,

I want to use BSP_BUTTON_TRIGGER pin to wake up the system. It still can't be woken up even if I change the code to nrf_gpio_cfg_sense_input(0x21, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW); Is there any other error in my code? Is it correct to define BTN_ID_WAKEUP as 0?

Thank you very much.

Ted Wu

RE: nrf52840 cannot wake up from sleep mode.

Sigurd — Tue, 17 Jan 2023 13:26:56 GMT

Hi,

Looks like you are trying to use pin 0 for this.

This pin is default used for the LF crystal.