cc3200 PWM frequency mismatch

Vinu Gopalakrishnan

Other Parts Discussed in Thread: CC3200

Hi all,

I tried to generate 10Mhz PWM in cc3200, but i am getting only 8.9Mhz. I can get frequencies upto 1Mhz correctly. When i increase the frequency the error also increases. please help.

over 10 years ago

0 Raghavendra Shenoy over 10 years ago

TI__Mastermind 27095 points

Hi Vinu,

Can you please share your code snippet with us?

Regards,
Raghavendra

0 Vinu Gopalakrishnan over 10 years ago in reply to Raghavendra Shenoy

Intellectual 635 points

0 Vinu Gopalakrishnan over 10 years ago in reply to Raghavendra Shenoy

Intellectual 635 points

#define TIMER_RELOAD 8 /* for a pwm period of 10MHZ */
#define PWM_DUTY_CYCLE 4 /* for 50% duty cycle*/

0 Raghavendra Shenoy over 10 years ago in reply to Vinu Gopalakrishnan

TI__Mastermind 27095 points

Hi Vinu,

Can you please share the value of TIMER_RELOAD?

Regards,
Raghavendra

0 Vinu Gopalakrishnan over 10 years ago in reply to Vinu Gopalakrishnan

Intellectual 635 points

#define TIMER_RELOAD 8 /* for a pwm period of 10MHZ */
#define PWM_DUTY_CYCLE 4 /* for 50% duty cycle*/

0 Vinu Gopalakrishnan over 10 years ago in reply to Vinu Gopalakrishnan

Intellectual 635 points

I could get frequencies upto 1Mhz correctly. The error occurs when we increase the frequency.

0 Vinu Gopalakrishnan over 10 years ago in reply to Vinu Gopalakrishnan

Intellectual 635 points

figured it out myself. The timer reload value must be 7 ,instead of 8.

0 HENG MA over 10 years ago in reply to Raghavendra Shenoy

Expert 1020 points

Hi Raghavendra

May I know how to generate a 1 KHz with 50% duty cycle pwm plz?
As I have tried prescale setting and find that the maximum frequency that can achieve is about 500 Hz.

Thnaks

Heng

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cc3200 PWM frequency mismatch