MSP430F6726A: DMA stop when eUSCI_A start

Hi Kevin,

For MSP430, DMA can't be used with CPU at the same time.

Can you post your code?

Eason 

Hi Eason,

Eason Zhou said:

For MSP430, DMA can't be used with CPU at the same time.

Thank you, I  missed this info.

Sadly I can't post my code directly here.

The thing that is Strange, is that the DMA is working with the CPU before I launch the UART communication.

As the CPU to be completely halted during the DMA transfer ?

Thanks,

Kevin

Hi Kevin

Yes, because in MSP430, CPU share the same bus with DMA, it is unable to use CPU and DMA at the same time.

If you can't post your whole code, a part of them is OK. Besides, a screenshot of register values is also be helpful. 

Eason

Hi Kevin,

Is this problem solved?

Eason

Hi Eaton,

The problem is not solved, for now we are back with the interrupts to get the ADC10 conversion value.

Here is the initialization of our DMA :

Which register do you want to see ?

Our code is communicating in continue via UART A0.

Regards,

Kevin

Hi Kevin,

You say "using the eUSCI_A, the DMA stop". How you know that?

I want see the Status Register (SR) and DMAxCTL Register when you use eUSCI_A. To check whether it is cause by the conflict between CPU and DMA.

Eason

Hi Kevin,

Is there any progress?

Eason

Hello Eason,

Thanks for your interest in our case.

For the moment we have other priorities, I will be back on that as soon as I can.

Kevin

Hi Kevin,

OK.

Eason