PWM for Libre Renegade?

Gendo_Ikari · May 19, 2023, 5:22am

Need help for the libre renegade

How do i utilize pin 12 for Pulse Width Modification (PWM) so that i can run it with a servo motor.

librecomputer · May 19, 2023, 6:14am

There is only 1 usable PWM on Renegade on pin 12 per the schematic. The other two are used as I2C controlling the PMIC. You need to create an overlay and set the status of pwm2 (pwm@ff1b0020) to okay.

Gendo_Ikari · May 19, 2023, 6:50am

My bad, since im still learning the ropes, how to do that?

And if I were to follow the guide for the le potato one, Is the dto combination still pwm-ao-b-6 on pin12?

librecomputer · May 19, 2023, 6:55am

Just realized that this is already in the wiring tool:

github.com

libre-computer-project/libretech-wiring-tool/blob/master/libre-computer/roc-rk3328-cc/dt/pwm2.dts

/dts-v1/;
/plugin/;

/ {
        compatible = "rockchip,rk3328";

        fragment@0 {
                target = <&pwm2>;
                __overlay__ {
                        status = "okay";
                };
        };
};

sudo ldto enable pwm2

If it works:

sudo ldto merge pwm2

Gendo_Ikari · May 20, 2023, 1:42am

Adjusted some of the variables from the Le Potato guide and now it works, much thanks!

j1h2 · July 23, 2023, 11:13am

I’m also trying to get the PWM working to control a piezoelectric buzzer and very new to this. I ran the ldto command above and connected the buzzer to pin 12 and gnd. What’s the next step after this to test this on the command line and also in Python?

librecomputer · July 25, 2023, 3:42pm

See How to Enable and Control PWM on Libre Computer ROC-RK3328-CC