STM CircleOS forum / ADC1 trigger by timer 4

Alex1985 · 2011-03-25 04:22:36

Hello!

I want start ADC conversion by timer4 CC_4 event and then read ADC data from ADC1->DR register. My problem allready has been discussed here: ADC external trigger?

I do all according to the reccomendation, ADC conversion start after TIM4_CNT and TIM4_CCR4 coincidence. ADC conversion does not stop and data register constantly updated, but i need only one conversion.

How can I solve this problem?

yrt · 2011-03-25 07:53:46

Hi Alex,

I don't know if the problem is there, but I think that DUALMOD has to be configured in "Independant mode", and DISCEN should be "Enable".
For my information, from which software did you get these screenshots ?

Yves

pascal697 · 2011-03-25 09:30:38

Hello,
I had the same problem last week. In order to track the ADC sampling accurately, I wrote a kind of spying software that waits on ADC status register STRT (Regular channel Start flag), toggles a debug IO, waits for EOC (End of conversion flag) and toggles back the debug IO because I assumed that the ADC status register was still updated no matter what kind of mode it was running in. Can anyone confirm this fact ?

As some other contributors here, I could not find any combination of registers to perform this task (which is mandatory in the application I am working on).

As for now, I am tackling other issues but I will have to go back to this topic.

If you have any comment, please do.

# 1 2011-03-25 04:22:36 ADC1 trigger by timer 4

ADC1 trigger by timer 4

# 2 2011-03-25 07:53:46 ADC1 trigger by timer 4

Re: ADC1 trigger by timer 4

# 3 2011-03-25 09:30:38 ADC1 trigger by timer 4

Re: ADC1 trigger by timer 4

Board footer