MSPM0G3507: DMA to PORTA and PORTB Simultaneously

Philip Neaves

Part Number: MSPM0G3507

Tool/software:

I can DMA to port A (32 bits).

I can DMA to port B. (32 bits).

Since portA address is 0x400A0000 and portB is 0x400A2000 (contiguous) I would have thought a 64 bit DMA to 0x400A0000 would write to both ports...

But it doesn't...

Any ideas ?

Phil

6 months ago

0 Bruce McKenney 6 months ago

Guru 99685 points

What results do you see? DMA access to the GPIO space is very limited. See also:

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1488027/mspm0g3507-q1-using-dma-read-gpio-pin/5714962

0 Pengfei Xie 6 months ago

TI__Genius 9095 points

Hi Philip,

Please refer Bruce's sharing threads for DMA behavior for GPIO in MSPM0.

As for your question, the GPIOA and GPIOB port have a separate flash region.

For example, if you want to transfer data to GPIOA DOUT, the destination address 0x400A1280 is used, and for GPIOB, you should use address 0x400A3280.

So write a 64bit data to GPIOA address region has no impact on GPIOB port content.

Best Regards,

Pengfei

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MSPM0G3507: DMA to PORTA and PORTB Simultaneously