GPIOTE library in SDK7.2 with nRF51422

RE: GPIOTE library in SDK7.2 with nRF51422

Yoshiyuki Kasai — Mon, 03 Aug 2015 09:18:27 GMT

The pin and GPIOTE are operational if the external noise doesn't happen. Thank you for your advice, I try to reduce the external noise.

RE: GPIOTE library in SDK7.2 with nRF51422

Susheel Nuguru — Fri, 31 Jul 2015 07:01:01 GMT

7.0V is too far from the operating voltage of 3.6V max, but if the noise is spike for few microseconds then I am guessing that it should not damage the line atleast.

Can you check if the GPIO pin and GPIOTE channel that connected to this pin are operational. You can do this by running GPIOTE example from SDK\examples\peripheral\gpiote and change the code little to match the PIN and GPIOTE channel you used.

If they are operational, then probably the power spike is taking the module into an unknown state. We cannot do much here inside the chip and you need to solve it by external noise reduction circuits outside the pin.

RE: GPIOTE library in SDK7.2 with nRF51422

Yoshiyuki Kasai — Fri, 31 Jul 2015 06:36:53 GMT

I'm using SDK library GPIOTE, so I think the event is cleared at the first in the handler. I'm not sure the event is set in GPIOTE, but the input is changed. This is my original circuit. VDD is 2.5V. Two switch inputs is pulled up with VDD. The maximum power noise to VDD is over 7.0V in a few nano seconds. I think this noise make a problem.

RE: GPIOTE library in SDK7.2 with nRF51422

Susheel Nuguru — Fri, 31 Jul 2015 06:11:13 GMT

Did you clear the event in the interrupt handle.

You mean to say that the event is set in GPIOTE later but the interrupts does not happen ? I have never experienced or heard of this problem before. How can I reproduce this?

RE: GPIOTE library in SDK7.2 with nRF51422

Yoshiyuki Kasai — Fri, 31 Jul 2015 05:59:19 GMT

I mean GPIOTE_IRQHandler doesn't happen anymore by the pin change after getting noise. But SPI and other function is available at that time.

RE: GPIOTE library in SDK7.2 with nRF51422

Susheel Nuguru — Fri, 31 Jul 2015 05:07:50 GMT

GPIOTE_IRQHandler become hung-up <--- What do you mean by this.

RE: GPIOTE library in SDK7.2 with nRF51422

Yoshiyuki Kasai — Thu, 30 Jul 2015 23:09:14 GMT

Aryan, Thank you for your answer. I know that, but GPIOTE_IRQHandler become hung-up. It means GPIOTE_IRQHandler never happen by the pin change after getting a lot of change during the interruption. The source of the noise would be power noise. I'm monitoring charging status. When the charge start, the pin become low level from high level. At that time, power line would get noise.

RE: GPIOTE library in SDK7.2 with nRF51422

Susheel Nuguru — Thu, 30 Jul 2015 13:48:02 GMT

If the pin changes so fast that the interrupt could not finish then it is very normal that you are missing few events. What is the source of that noise on your pin?