GPIOTE interrupts fail while using mesh

RE: GPIOTE interrupts fail while using mesh

ivangh24 — Tue, 17 Oct 2023 07:08:37 GMT

Hi again,

First of all, sorry for the wait, I have been working on my project and have managed to achieve my goal without the need to use another microcontroller. Thank you very much for your help.

Kind regards,

Ivan

RE: GPIOTE interrupts fail while using mesh

Kenneth — Wed, 20 Sep 2023 11:34:18 GMT

Okey, then I don't see how you realistically will be able to measure every high and low period no. You could potentially consider using the nRF5340 instead, where the radio runs in a different core than the application.

Kenneth

RE: GPIOTE interrupts fail while using mesh

ivangh24 — Wed, 20 Sep 2023 09:53:35 GMT

We are talking in terms of 150-300 microseconds. At the time the gpiote transition events occur, some are missed due to bluetooth interruptions and all measurements are wrong.

Ivan

RE: GPIOTE interrupts fail while using mesh

Kenneth — Wed, 20 Sep 2023 09:48:34 GMT

What is the duration of the high and low periods?

Kenneth

RE: GPIOTE interrupts fail while using mesh

ivangh24 — Wed, 20 Sep 2023 09:39:48 GMT

That's exactly what I need. I have to save each duration of high and low periods without using cpu. This is the reason why I thought about having gpio + ppi + timer and saving this data with dma. I don't know if this is possible somehow.

Kind regards,

Ivan

RE: GPIOTE interrupts fail while using mesh

Kenneth — Wed, 20 Sep 2023 09:28:41 GMT

What is the duration of the high and low periods? Do you need to measure every high and low period or can you skip some periods (for instance skip every other period)?

Kenneth

RE: GPIOTE interrupts fail while using mesh

ivangh24 — Wed, 20 Sep 2023 06:31:17 GMT

Hi again,

First of all, thanks for your reply. I'll say it straight out, I need to measure the time between low to high and high to low edges of a incoming PWM wave and save it without taking cpu time (as little time as possible because bluetooth mesh has more priority). Is there any way this can be possible?

Best regards,

Ivan

RE: GPIOTE interrupts fail while using mesh

Kenneth — Tue, 19 Sep 2023 11:45:23 GMT

Hello,

Not sure I understand what you want to do here, but you can find examples of low level nrfx driver here:
https://github.com/zephyrproject-rtos/hal_nordic/tree/master/nrfx/samples/src

One feature I would like to mention that may not be shown, is that most of the driver api support preparing transfers (e.g. by using NRFX_TWIM_FLAG_HOLD_XFER flag when calling nrfx_twim_xfer()), then to start a transfer you can for instance read out the task register (e.g. calling nrfx_twim_start_task_address_get()) and then connect this task to an ppi channel that should start the transfer from an event directly (e.g. gpiote IN event).

Best regards,
Kenneth