Disabling/enabling peripherals at runtime on nrf91

RE: Disabling/enabling peripherals at runtime on nrf91

MosheSmartAmr — Sun, 22 Sep 2019 07:37:05 GMT

Hi,

This still keeps UART in pull-up mode ,

how can I disable it ?

RE: Disabling/enabling peripherals at runtime on nrf91

RonanB96 — Tue, 10 Sep 2019 15:00:54 GMT

I was able to bring the current back down by calling gpio_disable_callback on the pin and enable a basic interrupt on the pin using the nrf_gpio_cfg_sense_set. I have opened up another ticket about the idle question

RE: Disabling/enabling peripherals at runtime on nrf91

Hakon — Mon, 09 Sep 2019 13:51:06 GMT

You should post this question separately in order to get better support. It is somewhat unrelated to the original question.

RE: Disabling/enabling peripherals at runtime on nrf91

RonanB96 — Sat, 07 Sep 2019 11:47:15 GMT

Sorry about the delay, I have only got around to testing this now. I have tested disabling the UART and I2C successfully but I have three more questions.

With an interrupt enabled on one pin I am seeing an increase of 45uA, is there a way to decrease this? The pin is configured with the following settings: GPIO_INT | GPIO_INT_EDGE | GPIO_INT_ACTIVE_HIGH | GPIO_INT_DOUBLE_EDGE | GPIO_INT_DEBOUNCE
Is there a common place where I can reenable my peripherals when leaving k_cpu_idle? I either leave idle from an interrupt or from a k_timer. I am not calling k_cpu_idle myself in any of my loops, just when all of my threads and inactive it is called.
I didn't find a function called disable_i2c() anywhere, where is it defined? I got around it by setting NRF_TWIM0_NS->ENABLE = 0

RE: Disabling/enabling peripherals at runtime on nrf91

Hakon — Thu, 29 Aug 2019 08:48:43 GMT

The following two lines shoud do it

disable_i2c();
NRF_UARTE0_NS->ENABLE = 0;

You can change NRF_UARTE0_NS to whichever UART device you want to disable.

RE: Disabling/enabling peripherals at runtime on nrf91

jbrzozoski — Tue, 27 Aug 2019 19:11:30 GMT

Check this thread for info on the UART: https://devzone.nordicsemi.com/f/nordic-q-a/50601/nrf91-power-save-mode-with-config_serial-y