DMA Not Functioning

 DMA Not Functioning

Hi,

I tried to program the DMA of the MCBSTR9 board but found out that it does not work. So far, Timer, ADC, VIC, & GPIO work for me.

The funny thing I see is that when I use simulation mode and run it in debugging mode, writing into the DMA registers like:

DMA->CCNF= 0xc000;

or

DMA_Channel3->SRC = &sourceAddress;

give "no write permission" warning message. The same thing goes for reading these registers.

I do not get this error for other on-chip peripherals I mentioned above. Can someone shed some light?

 RE: DMA Not Functioning

Sorry I meant to write

DMA->CNFR = 1;

instead of

DMA->CCNF= 0xc000;

 RE: DMA Not Functioning

Maybe this can help you: http://www.keil.com/support/docs/814.htm

 RE: DMA Not Functioning

have you seen this example in your tool chain installation path?

...\Keil\ARM\Examples\ST\STR91xLib\DMA\EXAMPLE1

 RE: DMA Not Functioning

No, it stops at ..\Keil\ARM\Examples\ST\STR91xLib\DMA (no Example1 directory)

 RE: DMA Not Functioning

it is included in MDK 3.20.

 RE: DMA Not Functioning

I already seen this accessing memory error but in my case the evaluation board wasn't correctly chosen in the project options / Device tab

 RE: DMA Not Functioning

Thanks for pointing out the example program. The example program works.

But I still have a query. Why Keil IDE simulation mode does not support the DMA? I can see other peripherals in the drop down menu, but not the DMA.