Something simple

[sd]

I'm trying without much success to write something fairly simple. Basically connect a signal to a pin, and run a function whenever that pin changes state. What's confusing me is how do I tie everything up so that my function is triggered based on the state of the pin. Is there example code anywhere? App note maybe? (The GPIOTE example is meant for toggling I/Os and I cannot quite understand from it how to do what I want. I've looked through the PPI documentation, but I'm afraid it is not very instructional for actually getting something done. I understand the theory, but lack the practical bit of how EVERYTHING is connected together from signal entry to execution.) I'm using the nRF51822 Evaluation Kit, and the SoftDevice.

[Håkon Alseth]

Hi,

I think you are over-engineering your problem a bit. Its not possible to have the GPIOTE/PPI to start a function call in such a "direct way". From your question, it seems like you want to generate an interrupt based on pin-change, and then run a function in code. This can be done using the GPIOTE PORT event. I am attaching an example on how to do this.

However, if you'd like to trigger a "chain reaction", for instance that pin change starts the ADC or similar, you can do this with PPI/GPIOTE. I am also attaching a example that triggers ADC each RTC TICK.

BR Håkon

rtc_trigger_adc.c

GPIOTE_Port_event.zip

[sd]

Thanks! I think you're right (looking at your example). Since I'm trying to integrate this into the heart rate monitor example, I'm now looking into getting this to work with the existing GPIOTE IRQHandler... it's not that easy tracing all the events and calls ;)

[sd]

I suspect that with the framework in the HRS example doing what I want should be very straight froward, but I'm not able to make it work yet.

[sd]

OK, got it to work. Thanks for the help!

[paul-b]

Hi Hakon, Nordic, I know this is a very old thread, but this example code could be very useful to workaround the GPIO power issue documented in the PAN. Can you please restore the C and Zip file referenced here? Thanks!

[Håkon Alseth]

Hi Paul,

We're still working on restoring older links, sorry for the inconvenience. The GPIOTE port event is available here: github.com/.../system-on-wakeup-on-gpio

And the RTC trigger ADC example is available here: github.com/.../rtc0-triggering-adc-sample