Multiple GPIO wake up source

[ble_bmt]

I am stuck on a particular problem when implementing gpio wake up interrupts.

I want my peripheral to be dormant for most of the time and only wake up when it receives an interrupt from a GPIO source (accelerometer, magnetometer ect) . I am running into difficulties determining which GPIO caused the device to wake up - I have tried pin_status1 = (NRF_GPIO->IN & (1 << PIN_1) & (1 << PIN_2)); with no luck.

Does anyone have any suggestions to achieve this functionality?

Thanks,

[Turbo J]

ble_bmt said:

 (1 << PIN_1) & (1 << PIN_2));

That is a zero, so pin_status1 will always yield zero. Elemental bitwise AND operation.

Filtering out both pins could be done in a singe statement by

pin_status1 =  NRF_GPIO->IN & ((1 << PIN_1) | (1 << PIN_2));

[ble_bmt]

Thanks for the reply.

My bad I was copying from an older forum post, the interrupt detection does not work with the OR operation pin_status1 = (NRF_GPIO->IN & (1 << PIN_1) | (1 << PIN_2)). 

[ble_bmt]

Does anyone know why the this is not working?

[bjorn-spockeli]

How have you configured the GPIOs?

[ble_bmt]

Using the configuration NRFX_GPIOTE_CONFIG_IN_SENSE_LOTOHI

Currently I am using pin_status1 = (NRF_GPIO->IN & (1 << PIN_1) | (1 << PIN_2)) at the start of main to get the pin values, is this the right place to be reading the gpios?