RE: NRF52 with ICM20948 wake up on motion issue

Jørgen Holmefjord — Wed, 25 Nov 2020 13:50:42 GMT

Hi,

As far as I can see from the datasheet of the sensor, the INT_PIN_CFG register has a reset value of 0x00. This should mean that "0 – The logic level for INT1 pin is active high", unless you configure it otherwise.

The best option should then be to configure the input pin on the nRF52 to sense transition to high, with a pulldown to make sure that the pin is in the state you want it until the sensor pulls it high:

nrf_gpio_cfg_sense_input(4, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);

Have you verified with a scope/logic analyzer that the input pin actually receives an interrupt signal from the sensor?

If not, the Invensense forum may be able to provide you with the correct configuration needed to enable the interrupt signal.

Best regards,
Jørgen