(DONE) PMW Abstraction On Top Of /sys/class/pwm/

• See also PWM Userspace Interface (using PCA9685)

Plan

class PWMPin
{
    // hmm, lets see ...
};

For functionality, start with test, like …

PWMPin pwm7("/sys/class/pwm/pwmchip0/pwm7");

uint64_t period = pwm7.period(); // read ./period
uint64_t a_third = period/3;
pwm7.set_duty_cycle(a_third);

Status

• 2024-11-05: done (toolcase/base/sysfs-pwm-pin.h)

Facts

• As an implementation detail (reading and writing small files in /sys/class/pwm/)

• Use class SysFSFile to read and write e.g. /sys/class/pwm/pwmchip0/pin7/duty_cycle.

  How to use class SysFSFile

• Implementation in toolcase/base/sysfs-pwm-pin.h.