Title: PWM [Print This Page] Author: Maverick_by_ Time: 10/25/2022 22:08 Title: PWM Last edited by Maverick_by_ In 10/26/2022 13:34 Editor
I try to use PWM, using this link: https://wiki.t-firefly.com/en/iCore-3568JQ/driver_pwm.html
1) There is NO kernel/arch/arm64/boot/dts/rockchip/rk3399-firefly-demo.dtsi in my /rockchip/ folder.
And i can't add the PWM DTS configuration in the DTS source file
pwm_demo: pwm_demo {
status = "disabled";
compatible = "firefly,rk356x-pwm";
pwms = <&pwm1 0 10000 1>; //pwm1WM number 0 10000WM period in nanoseconds 1:polarity
duty_ns = <5000>; //pwm duty cycle activation time, unit ns
};
Is documentation wrong?
2) I don't understand what to do with this C++ code: struct pwm_device * pwm1 = NULL;pwm0 = pwm_request(1, ¡°firefly-pwm¡±);pwm_config(pwm0, 500000, 1000000);pwm_enable(pwm0);
This is kernel driver source code, necessary to rebuild kernel and write firmware to SOM, why should i change it ? I need to change PWM parameters dinamically.How can i control it ?
WM number 0 10000