ESP32 Forum

Hello,
I run the LED_PWM as an Sound output.
Due the noise I want to disable the Output, if I don't play any sound. How can I disable it?

REG_CLR_BIT(GPIO_PIN_MUX_REG[18], SLP_OE);
or this
gpio_set_direction(LS_IO, GPIO_MODE_INPUT);

doesn't work. I'm still able to play a sound via PWM.
Can anybody help me with this issue?

kind regards

Peter

You can probably use the GPIO mux to mux the output pin back to the GPIO, or to a fixed 1 or 0 signal. Use gpio_matrix_out(ii_pin_number, SIG_GPIO_OUT_IDX, false, false); for example.

Hi,
I have have tried to MUX it to a fix value. Unfortunately there is still noise on the output. (If I don't initialize the PWM there is no noise.)
Is there no way to deinitialize the Pin in a fast way?
Regards
Peter

Can you specify 'noise'? Is the PWM signal still available on the GPIO? Because with the GPIO muxed to something else, that should not happen.

Hello,
thanks for the fast reply. If I change the PIN Mux the PWM disappear, but I still have some random noise on the pin. I try to get a closer look with a oscilloscope on the pin.

Kind regards

Peter