pls ignore (stm32f411 3 ADC conversions taking forever)

[PRenn.1]

..

[mƎALLEm]

Hello,

Please elaborate more and provide more details on the issue.

See Tips on posting.

[PRenn.1]

I tried to "measure" ADC delay for Measureing 3 Channels by using TIM2 configured for  500 ms per Pariod and used periodelapsed-callback to set the LED pin and call HAL_ADC_Start_DMA for 3 words.
The End would be HAL_ADC_ConvCplt_Callback whihc would reset the led pin.

Expected result : nothing to see because the time the LED would be on would only show up on the oscilloscope.

But i got LED slowly toggle between on and off, at app. 1 Hz.

That would insinuate exzessive ADC conversion time but it was only a measurement error: I may only switch on the LED (and start the next ADC DMA) when the LED was off at the end of a TIM2 period so I tried to get rid of the posting.

However, after changing the code the LED would never extinguish. 

Current verdict:
I'm still not smart enough to get the ADC going with CubeIDE (which has a very shallow learning curve)
or  I've got a STM32F411CEU6 with dead ADC, but nicely workung Timer, GPIO and USB_CDC.

Currently I seeking a program to verify the function of ADC (or DMA).

 

[PRenn.1]

Ok, ADC works. 
GND is read as 1,   +5V is read as 4095 and    Channel supended between 2 x 2k2 reads 2978, give or take.

DMA check is next....

[PRenn.1]

Must have been me, DMA is oky , too: from Start_DMA till ADC_ConvCpltCallback 9µs
And this is verified, I debugged the DMA output result.