How to setup the first servo to pwm channel 9

[Caemostajo]

Currently using the first 8 pwm channels for other purpose, how to setup the first servo to attach to the pwm channel 9 first and assign the next ones accordingly.

_ thx

[madhephaestus]

ESP32PWM allows you to select timers to use, but assumes it has unregulated access to all the channels. I would suggest using this library in place of whatever uses ledc functions.

[Caemostajo]

I have 4 motor drivers currently with ledc so i can control the frequency of each motor. I honestly want to keep using the ledc functions for this. So there is no way to use this library if there is another library using the timers?

[madhephaestus]

it plays nice with libraries using other timers, ledc is a different story. It spreads the ledc channels across timers. I do something similar, use one timer for my DC motors at 10khz, and one timer for my servos. Heres an example of me using on 2 PID motor with a servo:

https://github.com/WPIRoboticsEngineering/RBE1001Lib/blob/master/examples/FullSystemTest/FullSystemTest.ino#L26

I would suggest you look at ESP32PWM, it wraps the ledc methods, but arbitrates for the LEDc channels with the timers in a common system.

[Caemostajo]

I´ve decided to fork your library to make it start on the 9th pwm channel.

Can you please tell me where you are managing this so i can try to change it?

thx

[madhephaestus]

You really do not seem to understand what channels are and how they are associated with timers. You need to understand what timers are, that there are 4 timers each with 4 channels. Timer 0 is channel 0,1,8,9. Timer 1 is 2,3,10,11. Timer 2 is 4,5,12,13 And timer 3 is 6,7,14,15. The timers can be blocked off, but not the channels. Since you have all 0-9 used at the same frequency, there are no more timers available to use for a servo. You need to change to this library entirely, or change what channels you use to group them on 3 timers, leaving the last timer available for servos.

Ledc will not check the fact that you reuse timers, and when you start to use servos, other pwms will break as the base frequency of the timer is changed by the Servo code.

On Wed, Sep 2, 2020, 11:38 PM Caemostajo notifications@github.com wrote:

I´ve decided to fork your library to make it start on the 9th pwm channel.

Can you please tell me where you are managing this so i can try to change it?

thx

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/madhephaestus/ESP32Servo/issues/17#issuecomment-686231427, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAJSKRXQO2W5HXFBOMNNJKTSD4FS3ANCNFSM4QPQV4TQ .

[Caemostajo]

I see, thank you very much for clarifying how the timers and channels are linked, For now i will group the channels i´m using so it works with the library.

Thx!

[madhephaestus]

yeah, if you need 9 channels in the legacy LEDC, then instead of using the first 9, use:

char ledcIndexes[9]={0,1,8,9,//timer one 2,3,10,11,//timer two 4};//timer three

Which uses up timers 0, 1 and 2. To use this library for Servos, then only allocate timer 3, that would make it possible to use both.

On Thu, Sep 3, 2020 at 10:19 AM Caemostajo notifications@github.com wrote:

I see, thank you very much for clarifying how the timers and channels are linked, For now i will group the channels i´m using so it works with the library.

Thx!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/madhephaestus/ESP32Servo/issues/17#issuecomment-686524767, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAJSKRT77UGJZGIKKJXSILLSD6QYRANCNFSM4QPQV4TQ .