Where communities thrive


  • Join over 1.5M+ people
  • Join over 100K+ communities
  • Free without limits
  • Create your own community
People
Activity
    Lawrie Griffiths
    @lawrie
    I have also updated the ebay link to the exact one that I bought. Although the one in the picture says 16/02 and mine says 18/10.
    Goran Mahovlic
    @goran-mahovlic
    should I add holes for screws and make board bigger? Or this one is good enough?
    Lawrie Griffiths
    @lawrie
    Looks good enough to me, but the cable can apply some twisting force to it, so anyone who was using it more than just casually might appreciate a way of fixing it more firmly. But that applies to a lot of Pmods.
    Goran Mahovlic
    @goran-mahovlic
    I can add "ears" for screws and check out how it looks :)
    emard
    @emard
    For USB and ETH board to be properly put in a box, screw holes must be there for mechanical strength.
    Goran Mahovlic
    @goran-mahovlic
    Thanks to Drew we just got sponsorship for PMODs
    So I will accept wishes for next next PMODs
    Lawrie Griffiths
    @lawrie
    It that Drew Fustini of OSHPark?
    Goran Mahovlic
    @goran-mahovlic
    Yes :)
    Lawrie Griffiths
    @lawrie
    I have implemented @Dolu1990's flash access on the ulx3s, if anyone is interested. You can do things like:
    oot@buildroot:~# hexdump -C -n 100 /dev/mtd3
    00000000  93 06 10 00 13 06 00 00  93 05 09 00 13 05 0a 00  |................|
    00000010  ef f0 8f f8 6f f0 5f b4  03 a5 89 00 b7 e5 56 c0  |....o._.......V.|
    00000020  93 85 45 fb 13 05 85 10  ef 00 0b 8e 93 04 05 00  |..E.............|
    00000030  e3 00 05 c4 03 a5 89 00  b7 15 54 c0 13 86 04 00  |..........T.....|
    00000040  93 85 45 5b 13 05 85 10  ef 10 0b ef 13 8c 04 00  |..E[............|
    00000050  6f f0 df e8 03 a5 89 00  b7 15 54 c0 13 06 00 00  |o.........T.....|
    00000060  93 85 85 57                                       |...W|
    00000064
    root@buildroot:~# flash_erase /dev/mtd3 0 1
    Erasing 4 Kibyte @ 0 -- 100 % complete 
    root@buildroot:~# echo "Hello" >/dev/m
    mem               mmcblk0p1         mtd1              mtd2ro
    memory_bandwidth  mtd0              mtd1ro            mtd3
    mmcblk0           mtd0ro            mtd2              mtd3ro
    root@buildroot:~# echo "Hello" >/dev/mtd3
    root@buildroot:~# hexdump -C -n 100 /dev/mtd3
    00000000  48 65 6c 6c 6f 0a ff ff  ff ff ff ff ff ff ff ff  |Hello...........|
    00000010  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
    *
    00000060
    emard
    @emard
    I'm interested, please release updated stuff :))
    Lawrie Griffiths
    @lawrie
    You just need to use sdimagef or sdimagef64 to get the versions with linux flash support. I have copied the dts as well as the dtb to /boot so you can see what dts is being used.
    emard
    @emard
    wonderful!
    Lawrie Griffiths
    @lawrie
    If you flash uboot-env-bin@0x310000, you should get a u-boot environment that you can save with saveenv. It currently saves to /boot/uboot.env in partition1, which must be ext2 or ext4.
    I could produce a version for you that uses partition2.
    You then need to override the kernel bootargs to make linux use partition 2. I have not tried that. You can see the existing bootargs in the dts.
    Lawrie Griffiths
    @lawrie
    There is now a version of u-boot in uboot-env2.bin@0x310000 that uses partition 2. That is it stores the environment in partition 2 and gets uImage and dtb from partition 2. You still need to override bootargs to make linux use partition 2 as the root partition.
    emard
    @emard
    saving environment works, wow this are developing fast!! I should download new stuff and try
    Lawrie Griffiths
    @lawrie
    Has anyone used the Ulx3s with an LCD screen. I would quite like to use it with this screen, which a few of use developed for the TinyFPGA BX - https://discourse.tinyfpga.com/t/bx-portable-game-console-project-collaboration/553/124
    Goran Mahovlic
    @goran-mahovlic
    Do you have some link for this screen?
    We did use some SPI screen but from Arduino
    It could be driven by a double Pmod. If it could be mounted in such a way that the buttons were accessible, it could make a self-contained portable gaming device .
    We used the 8080 8-bit interface and no touch screen option.
    Lawrie Griffiths
    @lawrie
    I believe @daveshah1 produced an LCD Pmod. Has that been used with the Ulx3s?
    Goran Mahovlic
    @goran-mahovlic
    yes, we have @daveshah1 LCD supported and next one should be https://www.tme.eu/hr/details/rfe43bh-aiw-dns/displeji-tft/raystar-optronics/
    That is used in envox BB3
    Lawrie Griffiths
    @lawrie
    I have Verilog and SpinalHDL drivers for that 320x240 8-bit interface LCD. We used it with PicoSoC on the TinyFPGA BX, but I have also used it from SaxonSoc (but not SaxonSoc Linux).
    Goran Mahovlic
    @goran-mahovlic
    would be so cool to have SaxonSoc Linux display
    Lawrie Griffiths
    @lawrie
    Yes, In was looking into what would be involved with that when I thought about supporting that 320x240 display.
    There is a @daveshah1 tweet (about the LiteX Linux version) that said that supporting a 320x240 display using a frame buffer console driver should not be too hard. That could either drive HDMI or use an LCD display. Not on our immediate roadmap, but I was interested in seeing what it would involve doing.
    emard
    @emard
    @daveshah1 made a double PMOD PCB for this I think 320x240 display, it is directly pluggable to ULX3S, it has VGA compatible timing and signals so core effort is very small. For a good framebuffer burst capable read of SDRAM is required. Tiled text graphics would be much faster than framebuffer. If we have linux-side developer then my c2 acceleation 2D video can be supported used also....
    Lawrie Griffiths
    @lawrie
    Yes, I have seen @daveshah1's PMOD and I saw Matt Venn's version of it he used on the iCEBreaker board - https://github.com/daveshah1/pmods
    I am not too keen on making one myself as my surface mount soldering skills are not very good, and I am not sure which LCD to use , or how to mount it. I have not seen anywhere where an assembled one can be bought.
    Lawrie Griffiths
    @lawrie
    I used tiled based graphics on the driver I wrote for the ili9341 8080 interface LCD I mentioned above - https://github.com/SpinalHDL/SaxonSoc/blob/dev/hardware/scala/saxon/board/blackice/peripheral/Ili9341.scala.
    Goran Mahovlic
    @goran-mahovlic
    emard
    @emard
    https://www.adafruit.com/product/1601 thy also have some SPI display maybe it's same as yours but it has a lot of other PINs, I didn't go into details if it has VGA signaling or some parallel bus so some ready-made cores like f32c driver for david's lcd35 can be used
    Baj its ili 3941 :(
    emard
    @emard
    Yea I made this example :)
    Trellis compiles this example in 5s on my celeron
    Goran Mahovlic
    @goran-mahovlic
    @emard would this be ok?
    PMOD.png
    Lawrie Griffiths
    @lawrie
    The Adafruit display looks similar, but the buydisplay version has solder jumpers that allow them to be programmed using various interfaces (and is much cheaper). It is the 8-bit 8080 mode that I use rather than SPI. That is also used on some cheap Arduino shield TFTLCD displays, which I have also used with ice40 fpgas. It drives it fast enough to use tiled graphics or a framebuffer.
    The buydisplay ones also also ili9341.
    Goran Mahovlic
    @goran-mahovlic
    David PMOD is using LQ035NC111
    emard
    @emard
    @goran-mahovlic Yes exactly, in the plastic box are placeholders for the screws, you can use 2.5 mm holes on PCB. Screws are 2.2 mm going into plastic.
    @lawrie 8080 is parallel so I guess it should be fast enough with some 15-20 MHz same thing as David's PMOD that has pixel rate of 19.2 MHz
    @goran-mahovlic I'm not sure will we have space on topmost hole because of the box edge but screw is small so perhaps it's possible too but we must try first