PWM Generating at expanded GPIO

[Humam Helfawi]

Hi,

I have I2C GPIO expander. I used to generate PWM using

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ledc_channel_config

,

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ledc_set_duty 

and

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ledc_update_duty

at one of the original GPIOs of the ESP32.

Is it possible to use those function to generate PWM at GPIO in the expander? If not, what s the best way to do this manually? I tried to start new task

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xCreateTask

and do the generating manually via sending LOW and HIGH signals to the external GPIO but it was very slow and killing the ESP processor (I need 5KHZ frequency PWM).

Any suggestion?
Thanks!

[WiFive]

The best way is use an expander that has a built in led driver

[Humam Helfawi]

The best way is use an expander that has a built in led driver

Thanks for your reply! Do you have any suggestion?

[Humam Helfawi]

The best way is use an expander that has a built in led driver

Thanks for your reply! Do you have any suggestion?

I found this one http://www.ti.com/lit/an/snva287a/snva287a.pdf. but I think it is overkill (16 IOs). I am looking for at max 4 IOs only single one of them should have PWM ability.