topic Re: SPI with edma (32byte align problem) in Kinetis Software Development Kit

SPI with edma (32byte align problem)

martinmadron — Fri, 25 Sep 2015 10:16:19 GMT

Hello, my program keeps crashing when i try initi my DSPI driver. Worked without edma fine.

Here

	dspiResult = DSPI_DRV_EdmaMasterInit(SPI0_IDX, &dspiMasterState, &userConfig, &stcdSrc2CmdDataLast);
	if (dspiResult != kStatus_DSPI_Success)
	{
	PRINTF("\r\nERROR: Can not initialize master EDMA driver \n\r");
	}

Driver says stcdSrc2CmdDataLast has to be 32 byte aligned. I have used gcc atribute to set align, no warnings or errors.

typedef struct EDMASoftwareTcd {

uint32_t SADDR;

uint16_t SOFF;

uint16_t ATTR;

uint32_t NBYTES;

uint32_t SLAST;

uint32_t DADDR;

uint16_t DOFF;

uint16_t CITER;

uint32_t DLAST_SGA;

uint16_t CSR;

uint16_t BITER;

} edma_software_tcd_t __attribute__ ((aligned (32)));

Original Attachment has been moved to: customDspi.c.zip

Re: SPI with edma (32byte align problem)

Jorge_Gonzalez — Tue, 06 Oct 2015 01:19:51 GMT

Hello Martin Madron:

Exactly what board or Kinetis part are you using?

In the Kinetis SDK installation there are some ready to test DSPI+DMA driver example projects in the path:

...\KSDK_1.3.0\examples\<board>\driver_examples\dspi\dspi_edma_blocking

...\KSDK_1.3.0\examples\<board>\driver_examples\dspi\dspi_edma_non_blocking

You can start with one of those as reference and then integrate the code to your custom project.

Regards!

Jorge Gonzalez

Re: SPI with edma (32byte align problem)

martinmadron — Wed, 07 Oct 2015 09:41:59 GMT

Hello,

its frdm-k64. Those examples you have suggested are exactly same as my implementation. Program is using USB cdc and MQX with ksdk. I have read on this forum that it can be caused by USB using DMA. Is it possible?