nrf52832 P0.00 was changed unexpected

[zhangqg123]

nrf52832 P0.00 set as ouput but it's input value will be changed by pwm's ouput ?

[Håkon Alseth]

Hi,

 

Is P0.00 controlled by the PWM peripheral? If yes, then this will override any local GPIO settings when active.

 

Kind regards,

Håkon

[zhangqg123]

how can I check this config : P0.00 controlled by the PWM peripheral?

no matter how I use PWM0 or PWM1, or the PWM's ouput pin was others, P0.00  input value changed with the PWM output

[Håkon Alseth]

Enter debug mode and see what the peripheral registers are set to. If you are toggling GPIOs near the P0.00, there could be cross-talk that drives that input, especially if there is no pull-resistor on P0.00. Try enabling a pull-down or pull-up resistor on P0.00 and see if that works better.

 

Kind regards,

Håkon

[zhangqg123]

I find the reason:  the PWM init .output_pins if not used  must set NRF_DRV_PWM_PIN_NOT_USED