How to use PWM as DAC?

[mani]

Posted on August 04, 2016 at 12:49

STM32F207VE Custom Board. I want to generate a PWM of 50-50 duty cycle with varying voltages (zero-to-maximum) like a DAC which gives output based on count. I do not have the schematic now. I'm directly viewing the waveform on scope via breakout pins. The amplitude of the waveform must be in my control. I am successful in generating PWM wave but with a constant amplitude <3V>. How do I change the voltage now? 

I'm using Timer 4. #adc #stm32 #pwm #dma #dac #stm32f2xx

[Nesrine M_O]

Posted on August 04, 2016 at 14:44

Hi ganala.manikanta,

Please avoid duplication of posts, Check this [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/How%20to%20use%20PWM%20as%20DAC%202956&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=17]thread.-Syrine-

[AvaTar]

Posted on August 04, 2016 at 15:10

> Please avoid duplication of posts, Check this [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/How%20to%20use%20PWM%20as%20DAC%202956&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=17]thread.

If it was another, ''regular'' forum, I would agree. But here, always assume double-threads/posts are just another M$ Sharepoint error.

[Tesla DeLorean]

Posted on August 04, 2016 at 15:17

@Syrine

In other forums you just delete such empty/duplicate threads, no explanation is required. It is likely not the OP's fault, he likely got an error posting, assuming the post didn't get made, and resubmitted it.

[mani]

Posted on August 04, 2016 at 19:46

@clive1---Exactly! I intend to post only once. My internet connection lost while submitting and I submitted again thinking that first attempt was unsuccessful. I've tried deleting one of two but there is no such option (like many other forums).