MSP432P401R: Stopping PWM with DriverLib

Keith Barkley

Guru 42225 points

Part Number: MSP432P401R

I don't know why this is put in the "other processors" forum...

I use Timer_A_generatePWM() for pwm motor control. What is the accepted/preferred way to stop it with DriverLib?

Timer_A_stopTimer()? Set the duty cycle to zero?

over 4 years ago

0 Bruce McKenney over 4 years ago

Guru 101135 points

I vote for setting the duty cycle to 0. stopTimer will freeze the timer, which might leave the PWM signal asserted. Also setting the duty cycle allows the current (final) cycle to complete, avoiding a glitch.

0 Keith Barkley over 4 years ago in reply to Bruce McKenney

Guru 42225 points

I guess I could make the output a GPIO and set it low, too.

0 Hawken Li over 4 years ago in reply to Keith Barkley

TI__Intellectual 2585 points

Hi,

Another option is to switch the GPIO from PWM output to IO output and output low.

0 Bruce McKenney over 4 years ago in reply to Keith Barkley

Guru 101135 points

If you want to deassert ("off") the PWM signal immediately, I suggest instead setting (leaving) OUT=0 and setting OUTMOD=0 (Timer_A_setOutputForOutputModeOutBitValue and Timer_A_initCompare, I think).

This will also set the pin logic inside the timer, so you don't get a surprise when you start it up again.

Arm-based microcontrollers

Arm-based microcontrollers forum

MSP432P401R: Stopping PWM with DriverLib