[Letux-kernel] Status LX16

[Paul Boddie]

On 2024-12-22 17:55, H. Nikolaus Schaller wrote:
> 
> If we finally find a fix for the SPI speed and DMA issues, it is IMHO 
> mature enough to be
> announced to some community (well, which one?) and start upstreaming of 
> our patches.

What was the problem with SPI and DMA in the end? When I last checked, 
it seemed as if the SPI transfers were not being blocked, which had been 
a problem, but I suppose there might still have been problems with the 
DMA initialisation, necessitating a fallback on CPU-initiated transfers.

As for the speed, you probably saw my observations about the performance 
of the Waveshare board, which uses an unusual serial-to-parallel circuit 
to gain a few extra percent in performance. The controller is not really 
very fast, limiting the transfer clock to 20MHz, maybe 25MHz in some 
cases. This yields maybe ten frames per second at best.

[...]

> But everything is good enough now to build some units of version 0.4 
> early next year. And to
> share some of them with you and Lumissil. And to start work on an LX20 
> prototype.

It sounds very promising. Further investigation with the 0.2 board will 
remain one of my priorities after the holidays. You may have seen this 
short article I wrote a couple of weeks ago:

https://blogs.fsfe.org/pboddie/?p=2910

> So I wish everyone a Merry Christmas and a Happy New Year.

A Merry Christmas and Happy New Year to you and everyone else, too!

Best wishes,

Paul