topic Re: Data transfer from Bctu Fifo1 to buffer using Dma in S32K

Data transfer from Bctu Fifo1 to buffer using Dma

JawadAli — Fri, 05 May 2023 11:15:11 GMT

Hello,

I have to transfer data (periodically) from bctu fifo1 to a buffer using dma. Watermark value is set to 5, which means when fifo1 has 6 entries it shall trigger dma for data transfer. Adc result alignment is "ADC_ALIGN_RIGHT" and conversion resolution is "RESOLUTION_14".

Here is my bctu fifo1 configurations from Adc module:

Here are my dma configurations in Mcl module:

I want to transfer these 6 fifo entries in one minor loop and also one major loop, do you see any problem with my configurations?

For testing I have sampled Vrefh and buffer has values e.g. 32727. How to interpret this value, do I need to apply any shift or mask?

Thanks

Re: Data transfer from Bctu Fifo1 to buffer using Dma

JawadAli — Thu, 04 May 2023 18:20:45 GMT

@PetrS Could you please guide me to resolve this problem. Thanks

Re: Data transfer from Bctu Fifo1 to buffer using Dma

PetrS — Fri, 05 May 2023 13:02:40 GMT

Hi,

DMA setting looks correct but rather read full 32bit register. So use TRANSFER_SIZE_4_BYTE and adjust destination offset and last addr adjustment and minor loop size accordingly.

BR, Petr