LPSPI and DMA Help

kamal1 — Mon, 05 Apr 2021 20:02:05 GMT

Hello, I am using the MIMXRT1050 board with Keilv5 Pro edition.

I am working on a custom project and need help configuring my LPSPI and DMA. My goal is the use DMA to send 160 bytes to the transmit buffer of LPSPI. I have a area of memory where the data is stored. My function will take in the start address of the data and size of data as parameters.

I want to use DMA to send the data to the transmit buffer of the LPSPI. I see there is a special LPSPI_EDMA functions, but I am confused on how to set these API functions for my specific case. All the examples involve a master and slave board. In my case, I will be moving data from memory to the LPSPI TX buffer.

My understanding is if I use DMA and set the watermark of the FIFO to 2 words, I will be able to send2 words to the transmit buffer then the transmit buffer will be full and send out those words and return empty to take in the next 2 words until the DMA is complete.

How can I use the LPSPI_EDMA to send data from stored memory to the LPSPI TX buffer?

Any help is appreciated.

Best,

Kamal

Re: LPSPI and DMA Help

FelipeGarcia — Thu, 08 Apr 2021 16:06:51 GMT

Hi Kamal,

I sent you a response to the case you submitted internally about this. If you have any input please let me know.

Regards,

Felipe

topic Re: LPSPI and DMA Help in i.MX Processors

LPSPI and DMA Help

Re: LPSPI and DMA Help