MCX Microcontrollers中的主题 Re: Using dma to update gpio->ptor register does not work

Using dma to update gpio->ptor register does not work

Vipul_Shukla — Fri, 21 Mar 2025 13:31:42 GMT

I am trying to configure dma to toggle gpio pin using ptor register for that gpio but even after the dma transfer is done the pin is not toggled. DMA is trig match events. I am using frdmmcxn947 board.

If I am trying to transfer to a local buffer then the transfer is working as expected but if I change the destination address to GPIO2->PTOR register or even PDOR register then it is not working.

Re: Using dma to update gpio->ptor register does not work

Vipul_Shukla — Fri, 21 Mar 2025 13:35:04 GMT

I have attached my project zip file

Re: Using dma to update gpio->ptor register does not work

Harry_Zhang — Wed, 23 Apr 2025 04:06:13 GMT

Hi @Vipul_Shukla

I checked your code.

EDMA_PrepareTransferConfig(&transferConfig1, &data, 4, 0, (void*)&GPIO2->PDOR, 4, 0, 4, 4);

You used the PDOR register.

You can check the GPIO_PortToggle.

It use PTOR, not PDOR.

So you should change it to PTOR.

Harry