CC3200MOD: Setting for PWM Full Off

J.Schweiger

Part Number: CC3200MOD

Hello,

What is recommended in order to set a PWM to 0% duty cycle? I'm using the same settings as example (TIMER_INTERVAL_RELOAD 40035 and DUTYCYCLE_GRANULARITY 157). When I pass a value of '0' into TimerMatchSet, the PWM goes to 100% duty cycle (not 0!) Sending value '1' gets pretty low cycle, but how do I set to full off? Do I need to disable timer, change pin config, and set GPIO (then restart PWM anytime output rises above 0)? This seems overly complicated so I look forward to any advice.

over 7 years ago

0 made4engineering over 7 years ago

TI__Mastermind 27605 points

Hi Jon,
Perhaps use TimerControlLevel to invert the output for this special case. I suggest to get full range add some logic to UpdateDutyCycle to accept range from 0 to 256, with 256 mapped to uninverted TimerMatchSet( , ,0) and 0 mapped to inverted TimerMatchSet( , ,0).
Just an idea.

-Aaron

0 J.Schweiger over 7 years ago in reply to made4engineering

Expert 1745 points

Thanks Aaron, this works perfectly. TimerMatchSet(x,x,1) does exactly what I want. When my setting is 0 the output is full off. When it is 1023(I've adjusted my code from 8-bit to 10-bit), it is full on.

Thanks for your support!

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CC3200MOD: Setting for PWM Full Off