topic Re: S32K1x Use DMA with SPI Slave in continuous loop in S32K

S32K1x Use DMA with SPI Slave in continuous loop

guys_fr — Thu, 17 Nov 2022 13:52:04 GMT

Hello,

Is there an example code that uses LPSPI module in slave mode with eDMA in a continuous loop with the same memory block. The SPI master module is a high end iMX CPU. I am using the SPI_RDY signal but still have some error. Is it possible to setup the slave to response autonomously, without intervention.

Thanks, Guy

Re: S32K1x Use DMA with SPI Slave in continuous loop

JRoberto — Fri, 02 Dec 2022 18:36:19 GMT

Hello @guys_fr

What example are you trying? On which EVB?

Best Regards

Re: S32K1x Use DMA with SPI Slave in continuous loop

guys_fr — Fri, 02 Dec 2022 18:48:42 GMT

None, was looking for one. I use FIFO without DMA. The DMA exchange was added later then my original SDK files. What I have overlook, the code is "complexe" and requires clean-up on error, less autonomous. My ideal configuration would be /CS - Transact Exchange - CS High - self prepare "reset" for next exchange in the slave part. I didn't double check but I think iMX8 doesn't have the SPI RDY signal. We use the iMX6 master - S32K144 slave! FIFO is limited to 4x 32 bits with high speed exchange, DMA would allow larger data exchange with no risk of underrun/overrun/error.

Re: S32K1x Use DMA with SPI Slave in continuous loop

VaneB — Wed, 14 Dec 2022 20:15:48 GMT

Hi @guys_fr

Take a look at these examples, they will be useful to you.

Example S32K144 FlexCAN0 RXFIFO DMA nonSDK

Example S32K144 FlexCAN RXFIFO DMA

B.R.

VaneB