How to Configure a Channel Trigger for DMA

lessiffy — Sat, 23 May 2020 09:12:38 GMT

Hi!

I am learning dma on MCUXpresso IDE, using MK66SDK and there is no DMA driver any longer. The example code is as follows,

DMAMUX_Init(EXAMPLE_DMAMUX);
DMAMUX_EnableChannel(EXAMPLE_DMAMUX, 0);

EDMA_GetDefaultConfig(&userConfig);
EDMA_Init(EXAMPLE_DMA, &userConfig);
EDMA_CreateHandle(&g_EDMA_Handle, EXAMPLE_DMA, 0);
EDMA_SetCallback(&g_EDMA_Handle, EDMA_Callback, NULL);
EDMA_PrepareTransfer(&transferConfig, srcAddr, sizeof(srcAddr[0]), destAddr, sizeof(destAddr[0]),
sizeof(srcAddr[0]), sizeof(srcAddr), kEDMA_MemoryToMemory);
EDMA_SubmitTransfer(&g_EDMA_Handle, &transferConfig);
EDMA_StartTransfer(&g_EDMA_Handle);

I've learned that there used to be a function called DMA_ConfigureChannelTrigger().

I wonder how do I configure a trigger for DMA now. For example, if I want the DMA to transfer data only when it receives a rising edge of a gpio input, how do I accomplish that?

By the way, I am trying to convey camera sigals to OLED through DMA. So I need the DMA triggered by PCLK, but I don't know how.

Need some MCUXpresso IDE examples::(

Thanks!

Best Regards.

Re: How to Configure a Channel Trigger for DMA

FelipeGarcia — Tue, 26 May 2020 21:10:23 GMT

Hi,

We do have DMA drivers and examples in the MCUXpresso SDK. You can download EDMA demos from the below link. https://mcuxpresso.nxp.com/en/select

Regarding the DMA_ConfigureChannelTrigger() function, this API is included in some LPC microcontrollers drivers. The DMA module is different so this API is not implemented for K66 MCU.

Best regards,

Felipe

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How to Configure a Channel Trigger for DMA

Re: How to Configure a Channel Trigger for DMA