Thanks Greg - I'm sure someone would have tripped over all of this if they'd tried to get DMA working. I will at the very least get it tested as best as I can on SAMA5D2 - which it definitely seems I am the only actual user of with NuttX! Lucky me lol.
>-----Original Message----- >From: Gregory Nutt <spudan...@gmail.com> > > I did the D3 and D4 ports years ago and I am not aware of any other use of >those boards. DMA was partially functional then, but was not well tested and >was still buggy. There were problems documented in >https://github.com/apache/incubator- >nuttx/blob/master/boards/arm/sama5/sama5d4-ek/README.txt >which look like the same issues with the SAMA5D3x-EK in >https://github.com/apache/incubator- >nuttx/blob/master/boards/arm/sama5/sama5d3x-ek/README.txt > >The D2 was more an effort of several people and was based initially on the >D4 (which was based on the D3). > >On Mon, Sep 12, 2022 at 8:30 AM TimH <t...@jti.uk.com.invalid> wrote: > >> Aargh...too quick to retract. I think definitions for ATSAMA5D3 and >> ATSAMA5D4 are swapped and there *may* be inconsistencies, based on a >> comparison to datasheets. I don't think anyone has used it as I am 99% >> sure it wouldn't have worked as best as I can tell. File with issues is: >> >> arch/arm/src/sama5/sam_dmac.h >> >> It was the right file I was looking at, got confused by the presence >> of sam_xdmac.h as well as sam_dmac.h. >> >> I will had "# warning" for ATSAMA5D3 and ATSAMA5D4, and add a new >> section for SAMA5D2 which at least I hope to be able to check and >> confirm as working. >> >> >-----Original Message----- >> >From: TimH <t...@jti.uk.com.INVALID> >> >Sent: 12 September 2022 14:54 >> >To: dev@nuttx.apache.org >> >Subject: RE: SAMA5D3 and D4 DMA >> > >> >Scrap that for now - was looking in the dma not xdma files >> > >> >>-----Original Message----- >> >>From: TimH <t...@jti.uk.com.INVALID> >> >>Sent: 12 September 2022 14:14 >> >>To: dev@nuttx.apache.org >> >>Subject: SAMA5D3 and D4 DMA >> >> >> >>I am reworking DMA to get it working for the SAMA5D2. It seems to me >> >>that there are also errors and inconsistencies in the DMA code for >> >>the >> >>SAMA5D3 and D4 family. >> >> >> >> >> >> >> >>For now I have added "# warning" pre-processor statements. I have no >> >>means to check ATSAMA3 or ATSAMA4 devices - so unless someone can >> >>confirm that DMA does actually work for those 3 families and I've >> >>misunderstood something I will suggest that the warnings remain in >> >>place when I >> >eventually >> >>submit a PR for my work. >> > >> >> >>
