STM32H743 Timers + ADC + DMA

[ICT_TAN]

Hi you all,
as a breef summary; I set up a timer to trigger an adc that should than use the DMA to transfer the data to memory, i need 111 samples at a time. Sadly for some reason this only works for one sample so if i check 

__HAL_DMA_GET_COUNTER(g_hadc1->DMA_Handle) it will get stuck at 110.
and subsequently my 

HAL_ADC_RegisterCallback(g_hadc1, HAL_ADC_CONVERSION_COMPLETE_CB_ID, ADC_LineScanComplete_Callback); is never called.

Though the timer and ADC for sure triggeres as i can the see the DR register updating its value.
And as far as the reference manual goes (Page 961 DMA One-shot) it should be possible to use 

HAL_ADC_Start_DMA(g_hadc1, (uint32_t*)dest, 111); to get like 111 sequential timer triggered samples, that are transfered to memory via DMA 

I tried various combinations of all possible adc settings, and all of them keep beeing stuck on 110 remaining DMA cycles. As well as trying to look up the resgisters for any errors that might have been accured, but i was unable o find anything suspicious.
It just seems that there is like no new DMA request generated after the first one.
For like testing I've chosen a reasonable 5 us cycle time for the timer(though for prodution this would need to go down to ~ 500ns at this point i will prob have to step away from HAL drivers).
But the timers is as far as i am concerned the only viable way of properly time ADC and signalgenerator in the fastes reliable way.
My assumption of the correct config would be 

on a LQFP176 Package

Did anyone observe something simelar or has any help at hand ?
If you need further information I'll happyly provide it ! 
Greetings 
Tan

[TDK · Accepted solution]

Does the first value in the buffer get populated?

Is the buffer somewhere where DMA can access?

DMA is not working on STM32H7 devices - STMicroelectronics Community

Including the full compileable project code would be helpful.

[ICT_TAN]

Thank you so much it is exactly as you stated, it was an issue of the buffer beeing placed in the DTCMRAM region.
Now everthing works as expected. 
I was absolutly not aware of that beeing an issue. 
I tried to find some references to this specific behaviour in the reference manual but i could not find any neither in the ADC section nor in the DMA section. Those for sure would be helpful