PWM and TIMER1 problem in stm32f4

vss01 · ‎2016-02-21

Posted on February 22, 2016 at 00:13

Hello,

I need to generate sin wave using STM32 uC.

Now here comes the problem.

I am able to obtain the required sin wave with the required frequency and the required amplitude however there are other (more than one) frequency components.

After spending some time, I think I have pinpointed my problem down to having something related to 'jitter' in the PWM or phase noise because of a mismatched PWM frequency and sample rate of the lookup table.

What do you think? Any help would be appreciated!

vss01 · ‎2016-02-24

Posted on February 25, 2016 at 07:23

I tried the code but I didn't see any output from both pins (1 & 1N). I think it is still in high impedance mode. Can you send me the source code please and tell me what you tried to change?

vss01 · ‎2016-02-25

Posted on February 25, 2016 at 22:25

@clive1, any clue of how i should proceed?

Your help is much appreciated. Thank you.