app_pwm_init drives excessive current

[dsnejko]

Hi,

I am using app_pwm in low power application on nRF51822 with soft device S110. Today I measured power consumption and found the current was ~1.5mA during advertising and it dropped to ~500uA in system_off. I tried to find out where this current came from and was able to reduce it to ~50uA removing app_pwm_init from the code. I tried to use app_pwm_uninit to disable the timer because I didn't need pwm all the time, but the consumption was still high. Does it mean app_pwm is not compatible with low power applications and if where is any work around?

Regards, DSnejko

[Susheel Nuguru]

The library has issues regarding this. Check if it is related to this

[dsnejko]

Thanks, Aryan. I would like to add only: to reduce current I also made app_pwm_uninit. Here is the sequience which worked:

  app_pwm_disable(&PWM1);
  nrf_drv_gpiote_out_task_disable(pwm_pin);
  err_code = app_pwm_uninit(&PWM1);
  APP_ERROR_CHECK(err_code);		
  nrf_gpio_cfg_output(pwm_pin);
  nrf_gpio_pin_set(pwm_pin);

[Susheel Nuguru]

This is because of the PAN_73 work around, i will update this in the other thread. Thanks for updating us. If there is nothing more on this topic can you please accept this answer.

[FormerMember]

I was in the same problem.

If I declare app_pwm_init(), the current increased 0.4mA to 1.6mA.

but now, the current maintain 0.4mA steadily and I can use pwm whenever I want.

Thanks.