disable PWM does not work

[JochenKr]

I tried to turn off the PWM outputs but it seems that it doesn't have an effect.

My approach was to force _timer_automatic_output_disable(TIMERBLDC); in CalculateBLDC(void) as below https://github.com/RoboDurden/Hoverboard-Firmware-Hack-Gen2.x-GD32/blob/839d1ab7ff600f73b3853bb75097d5406cfda1bf/HoverBoardGigaDevice/Src/bldc.c#L184

    if (1)//(currentDC > DC_CUR_LIMIT || bldc_enable == RESET || timedOut == SET)
    {
        timer_automatic_output_disable(TIMER_BLDC);     
        //DEBUG_LedSet(SET,0)
  }
    else
    {
        timer_automatic_output_enable(TIMER_BLDC);
        //DEBUG_LedSet(hall_c == 0,0)
  }

The PWM is still present and the wheels can spin as normally.

[RoboDurden]

Maybe SetEnable() is what you want:

https://github.com/RoboDurden/Hoverboard-Firmware-Hack-Gen2.x-GD32/blob/839d1ab7ff600f73b3853bb75097d5406cfda1bf/HoverBoardGigaDevice/Src/main.c#L513

[JochenKr]

I tried to use SetEnable(RESET); with the same method as above. but still no impact on PWM outputs visible :-(

in main.c I've commented SetEnable(enable); out, to make sure that this one doesn't turn on the PWM again.

[RoboDurden]

I still do not know what you want to achieve. I think it is normal that you have full pwm running with speed at zero. The hi-side and low-side mosfets are inverse so no current flowing.

If you want pure silence you may have to study void PWM_init(void) in setup.c

[JochenKr]

Ok, I'll check. My target is to save energy during idle. With 4 motors the 24 Mosfets have significant switching losses also if no current is involved. These I would like to eliminate

[AILIFE4798]

mosfet do not need current to stay on gate driver need less then 1w

[JochenKr]

Correct, Mosfets do not need current to stay on. Charging and discharging of capacitors e.g. gate charge Cg mainly generate losses. My setup is far beyond 1W

[RoboDurden]

I also do not like this ever ongoing pwm. I have lots of signal noise on my i2c bus ...

[AILIFE4798]

actually i do not understand what the problem is