Why can't I add more that 4 input signals?

RE: Why can't I add more that 4 input signals?

Ole Bauck — Mon, 23 May 2016 13:50:18 GMT

The nrf_drv_config.h files are configured for every project. Since most of our projects in SDK are based on nRF51 DK or nRF52 DK they will use four buttons, therefore this is set to four. If you look at the config file for for example the beacon it should be different.

RE: Why can't I add more that 4 input signals?

mosi — Mon, 23 May 2016 13:34:22 GMT

true statement means that the driver will use "high accuracy". I have selected false. Pretty descriptive, no? :-P

RE: Why can't I add more that 4 input signals?

mosi — Mon, 23 May 2016 13:01:30 GMT

So why is it set to 4 in the SDK?

RE: Why can't I add more that 4 input signals?

RK — Mon, 23 May 2016 12:42:52 GMT

Because there's only 4 GPIOTE channels on the device and you're asking for high accuracy which needs a GPIOTE channel. So when you've used 4, there are no more to use.

The error return NO_CHANNELS is pretty descriptive, no?

RE: Why can't I add more that 4 input signals?

Ole Bauck — Mon, 23 May 2016 12:36:55 GMT

Probably GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS in nrf_drv_config.h is too low (default is 4). Try changing it to the number of buttons you have.

Ole