Nice library but seems PWM is behaving a bit strangely

[haegr]

Perhaps it's just me but whenever I try to use PWM the BCM pin 2 changes from ALT0 to ALT2 and suddenly it's no longer possible to use ADC chips to for example read the value of a Rotary Potentiometer and then controlling a DC motor using PWM. Doesn't seem to matter if I use PWM on BCM pin 12 or BCM 13.

Using Raspberry PI 4.

[mjgaga]

Same problem

[drahoslove]

That's interesting behavior. Did you guys find out which function call was causing it?

Also, it might be fixed by #50, which was in master for a long time, but unfortunately, it wasn't tagged so it was not used if you were using go modules. I created the new tag now, so you might try to update it (go get -u github.com/stianeikeland/go-rpio/v4) and check whether it solves your issue.

[Escalion]

This appears to still be an issue; we attempt to set pin 13 to PWM.

if err2 := rpio.Open(); err2 != nil {
                        log.Printf("Error loading brightness_control module")
                        err = err2
                        return
                    }
                    log.Printf("Start Brightness pin setup")
                    pin := rpio.Pin(13)
                    log.Printf("Set PWM")
                    pin.Mode(rpio.Pwm)
                    log.Printf("Set Freq")
                    pin.Freq(100000)
                    if bri, err2 := getBrightness(); err2 == nil {
                        log.Printf("Set duty cycle")
                        pin.DutyCycle(uint32(bri), 100)
                    } else {
                        err = fmt.Errorf("error getting brightness value: %v", err2.Error())
                    }
                    log.Printf("Close mem map")
                    rpio.Close()

Our log stops at "Set Freq" and the process then hangs.

Calling raspi-gpio also shows the pin is still configured as set in config.txt (gpio=13=op,dl).