nrf52 ble + pwm huge power consumption

RE: nrf52 ble + pwm huge power consumption

flip-flop — Thu, 07 Sep 2017 18:19:57 GMT

Hung Bui,

Thank you for your support. I just want to inform you that I solved the problem. I simply wrote my own pwm driver and now power consumption is 1.8uA. It seems that mbed's pwm and softdevice are in some kind of conflict.

Regards, flip-flop.

RE: nrf52 ble + pwm huge power consumption

Hung Bui — Wed, 06 Sep 2017 22:40:19 GMT

Hi Flip-flop,

I got the source of the library here: github.com/.../pwmout_api.c

But unfortunately I still couldn't explain why the current consumption is high. I would suggest you to post the question on mbed forum .

Also, if you want to get to the lowest level, I would suggest to try our SDK.

RE: nrf52 ble + pwm huge power consumption

flip-flop — Fri, 01 Sep 2017 07:24:25 GMT

Thank you so much for support.

RE: nrf52 ble + pwm huge power consumption

Hung Bui — Thu, 31 Aug 2017 15:07:53 GMT

No that doesn't mean that the softdevice use PWM0, same as TIMER3, TIMER4 and PDM. It's a mistake in the documentation, we should include all peripherals.

I just checked here and see the same issue. I would need to have a look into PwmOut library, but doesn't seem very straight forward to find the source. I will get back to you when I find something.

RE: nrf52 ble + pwm huge power consumption

flip-flop — Thu, 31 Aug 2017 10:19:42 GMT

In the example, I tried all 4 combinations. Here you can find on page 23 that only PWM1 and PWM2 are "open to use" with SD. infocenter.nordicsemi.com/.../S132_SDS_v5.0.pdf

RE: nrf52 ble + pwm huge power consumption

Hung Bui — Thu, 31 Aug 2017 09:09:11 GMT

This is pretty strange. With the code in the example, is it PWM OFF + BLE ON ?

I don't think the softdevice use PWM0, could you point me to the doc you found that information?