NRF52 Calculation Method Between Rising Edges

RE: NRF52 Calculation Method Between Rising Edges

Sigurd — Mon, 28 Oct 2019 20:45:21 GMT

[quote userid="84116" url="~/f/nordic-q-a/53139/nrf52-calculation-method-between-rising-edges/216732"]Is it correct to use these two functions together?[/quote]

No, not for the same timer instance.

I made some adjustment to the example, e.g. added Segger RTT logging. It will count the number of low to high pulses for the duration of 10sec(COUNT_READ_INTERVAL), print the number, then it will restart counting from 0. I tested this with SDK 15.3:

Attachment: devzone.nordicsemi.com/.../gpiote_5F00_timer_5F00_ppi.zip

RE: NRF52 Calculation Method Between Rising Edges

Glory — Fri, 25 Oct 2019 06:29:55 GMT

Handler does not work after timers_init.
timer_cfg.mode = NRF_TIMER_MODE_TIMER
timer_cfg.mode = NRF_TIMER_MODE_LOW_POWER_COUNTER

Is it correct to use these two functions together?

RE: NRF52 Calculation Method Between Rising Edges

Glory — Fri, 25 Oct 2019 00:38:33 GMT

Oh...!
There are a lot of things I don't know.

Thank you for helping me. I'll test the part you've mentioned after I've corrected it.

RE: NRF52 Calculation Method Between Rising Edges

Sigurd — Thu, 24 Oct 2019 11:15:52 GMT

For every transition from low to high, the counter is incremented, and can be read in timer_handler_read().

You might however need to change the argument in GPIOTE_CONFIG_IN_SENSE_LOTOHI() from false to true.

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_LOTOHI(true);

RE: NRF52 Calculation Method Between Rising Edges

Glory — Wed, 23 Oct 2019 00:10:25 GMT

After checking the code you attached, is it correct to check the Rising edge to Rising edge count with timer_handler_read?

RE: NRF52 Calculation Method Between Rising Edges

Sigurd — Tue, 22 Oct 2019 08:33:45 GMT

Yes, you have 8 GPIOTE channels, so that should not be an issue. Also note that PPI has a fork mechanism, so one event can trigger a second task.

RE: NRF52 Calculation Method Between Rising Edges

Glory — Tue, 22 Oct 2019 00:31:39 GMT

Using GPIOTE, can I set two pins to detect the Rising edge and start and end with PPI?

RE: NRF52 Calculation Method Between Rising Edges

Sigurd — Fri, 11 Oct 2019 13:49:28 GMT

Hi,

Take a look at this post.

This might also be useful:devzone.nordicsemi.com/.../pin_5F00_rise_5F00_count_5F00_ppi_5F00_gpiote_5F00_timers.zip