that is current output from PMOD
and if I pass input to output - and assign leds to both - on ULX3S TX and RX leds are blinking
when I play some sample on computer that has cheap USB MIDI connected
And IN led on this adapter never starts to blink
now it it blinking - will check how I can fix this
@headkaze I did manage to get MIDI PMOD to work - but do not have any time this week to make a new one - I do have all parts so next week I could probably send to you for detailed inspection :)
@lawrie greal, lcc has termios and timespec in the includes!!!
@vmedea There is also Vexriscv LiteX Linux, which uses the same Riscv CPU (written by @Dolu1990 in SpinalHDL), but uses a Wishbone bus and the Litex peripherals, written in the python-based migen language. I think the issue with the Litex version is that not as much work has been done to support the Ulx3s board and all its hardware. It did not support the SD card and flash memory, the last time I looked. And it was much slower to load.
But I am sure the Litex version could be made to work much better on the Ulx3s board. I have not seen users of it on the gitter for a long time.
SaxonSoc is written by @Dolu1990 and is written entirely in SpinalHDL. Litex used to support more peripherals (but not all on the Ulx3s board), but SaxonSoc has caught up and overtaken it in a lot of areas.
See my tweet thread on what SaxonSoc supports - https://twitter.com/lawriegriffiths/status/1312360783028903937
(Perhaps I should add that you can now run Tetris).
thanks ! that's good to know, at this point i'm really trying to find an entry point, where to get started with Linux RISC-V on the ULX3S, there's so many options and that's kind of overwhelming ! so yes, sounds like Saxon is what people are working on here mostly, and has the most support from the kernel side
I read about very simple code to use the ram ?
I am not sure if you are referring to the sdram controllers I did two months ago. I think they are simple, 150-170 lines of verilog. There is a 68K controller that is free running versus the CPU clock and a 99K controller that is synced to the CPU machine cycle. Both are variations on the same theme (and derivatives of a controller that Lawrie suggested).
https://gitlab.com/pnru/ulx3s-misc/-/blob/master/M68K/sdram.v
https://gitlab.com/pnru/cortex/-/blob/master/sdram.v
Happy to help if you have any questions. If you referred to something else, no harm done.
@lawrie latest lcc is good and I made cleanup (timespec and termios now included), same code compiles gcc and lcc. Done lot of improvement while still keeping it short, light, minmal CPU usage. Many invisible important details are supported now, fair randomizer, drop-and-move, sync to real time clock.
Also where can I find the schematics for the PMOD modules that shipped as part of the pmod set on scrowdsupply? Thanks!
I am particularly interested in the Dual USB PMOD which looks very sophisticated (a lot of diodes!)
@headkaze Right. The latest schematics is 3.12 and I can't find one for 3.08. I think I spotted some differences in wiring between the ESP32 and the FPGA but it isn't clear to me what's really going on for 3.08
latest v3.1.2 design has many changes - @emard will try to get SERDES out
and yes now board should be able to accept WROVER and WROOM modules
but none of this is tested
But soon we will make first prototypes with this new version
