DRA829V: McSPI1 DMA configuration

Hi Ralph,

Ralph Neumann said:

In \ti-processor-sdk-rtos-j721e-evm-08_01_00_13\pdk_jacinto_08_01_00_36\packages\ti\csl\example\mcspi\mcspiMasterSlave only EDMA3 functions like "EDMA3Init(EDMA_TDA2XX_U_BASE, 0)" are used.

Please refer to the makefile at <PDK_INSTALL_PATH>\packages\ti\csl\example\mcspi\mcspiMasterSlave , mcspiMasterSlave_spi1_spi2_v1.c file is used to build for j7 platform. This file does not use any EDMA3 APIs.

Ralph Neumann said:

Is there any programming guideline or example for such dma spi transfer job where the UDMA functions will be used?

Please loot at the example at <PDK_INSTALL_PATH>\packages\ti\drv\spi\example\mcspi_slavemode\src for reference for UDMA functions.

Regards,
Parth

Hi,
i loot from your example and implement it in my application. But it is only possible to tranfer one Byte via SPI.
Has anyone else this issue?
Regards,
Ralph

Hi Ralph,

Ralph Neumann said:

i loot from your example and implement it in my application. But it is only possible to tranfer one Byte via SPI.

Can you please provide more details here.
What is happening after the one byte transfer? Is it hanging somewhere or running into error?

Regards,
Parth

Hi Parth,

after the one byte transfer it will enter MCSPI_dmaTxIsrHandler and the transaction status is set to SPI_TRANSFER_COMPLETED.
It will not hanging or run into an error.

Regards,
Ralph

Hi Ralph,

Ralph Neumann said:

after the one byte transfer it will enter MCSPI_dmaTxIsrHandler and the transaction status is set to SPI_TRANSFER_COMPLETED.

How are you checking that only one byte is transferred? 

How much data are you transferring?
Also, what is the value you are setting for SPI_MSG_LENGTH?

Regards,
Parth 

solved