Error DMA SPI

[ailtonlopes]

Hi, 

So I have a driver for the spi that is similar to the driver offer by the nxp and it works perfectly using interrupts to send and receive data, right now I'm having this issue when i try to use the dma do handle the writing and copying of the data from the spi registers. I realized that after i set the RSER bits to generate the spi request in tx and rx (the same way as done in the nxp drivers) as soon as i write the RSER register an error is raised to the tx channel the tx Source address and some configurations are also changed and I have no clue on what it is raising the error.

Kind regards, 

Ailton Lopes

[davidtosenovjan]

Could you provide details about mentioned error? Which device is this question related to?

[ailtonlopes]

davidtosenovjan‌ Thanks for the quick reply, In this message is annexed to code im having the error. 

The project it is for the MPC5748g

kind regards, 

[davidtosenovjan]

Could you rather show me how your configure TCD descriptors causing the error? Ideally debugger screenshots. Thanks

[ailtonlopes]

So in the first 3 screenshots there's the state of the DMA registers before writing the the SPI RSER register

The error is occurring in channel 3

The line of code causing the error 

This is the dma regs after writing the RSER reg 

And finally the TCD after the error 

Kind regards, 

Ailton Lopes

[davidtosenovjan · Accepted solution]

DSPIx_PUSHR register needs to be accessed by 32-bit write. Then it'll work for you.