RE: nRF51 external interrupt with low power

roger.k — Mon, 21 Mar 2016 02:41:49 GMT

Thanks a lot. It's very helpful.

RE: nRF51 external interrupt with low power

Ole Bauck — Wed, 16 Mar 2016 09:55:15 GMT

You will also probably need to change GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS to 5 in nrf_drv_config.h as 4 "low power events" are already used (4 buttons).

RE: nRF51 external interrupt with low power

Ole Bauck — Wed, 16 Mar 2016 09:53:19 GMT

You are using

GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);

where the true statement means that the driver will use "high accuracy" which is the equivalent to GPIOTE IN event. GPIOTE IN event will request the HFCLK and 1V2 regulator as can be seen in Product Specification chapter 8.3 "Block resource requirements".

If the statement is false the driver will use "low accuracy" or GPIOTE PORT event. This is low power and will keep the current consumption at the level you had before gpio_init(). The drawback with GPIOTE PORT event is that this is shared between all the pins that use this event. You can read more about the PORT event in the Reference Manual chapter 14 (GPIO) and 15 (GPIOTE).