How many PWM channels for ESP32 using Arduino?

[danlu01]

Hardware:

Board: ESP32 Dev board
Core Installation/update date: Latest of 3/23/2017
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: ?115200?

Description:

In the ESP32 example for LEDCSoftwareFade, there's a comment hinting there are 16 LEDC_Channel starting from 0. However, any PWM assigned to channel over 8 does not work. When I search for LEDC_CHANNEL, ledc.h shows only 0-7 channels. What is the max number of PWM available? If more than 8, how do enable more than 8?

Sketch:

 // use first channel of 16 channels (started from zero)
 #define LEDC_CHANNEL_0     0

//Change the code below by your sketch
see ESP32 example LEDCSoftwareFade.ino

[lbernstone]

There's 16 hardware channels, but only 8 timers. I think to simplify things the arduino code only exposes 8 channels. If you want more, you can directly access them (and micromanage them) using the IDF functions.

[danlu01]

Is there an example/tutorial on how this is done?

[lbernstone]

https://github.com/espressif/esp-idf/tree/master/examples/peripherals/ledc . If you don't need more than 8 frequencies, you could also modify the arduino library.

[danlu01]

My mistake... I got it working now.