Carrying on from building my AX-80 rack mount I bought some slim displays that could actually be used to repair an Akai AX-80 with broken displays. Originally I used ST7789 2" 320x240 SPI displays for my own builds, but I found these monochrome SSD1322 3.12" 256x64 SPI displays. They are actually more expensive than the 2" displays, but they are possibly suitable as a replacement/upgrade for the AX-80.
So I recoded my sketch to support these displays and the monochrome, I had to remove the labels because they are no longer needed in the real AX and I cannot generate the custom orange block at the bottom of each column in the genuine AX, so that is mimicked with a solid rectangle when selected.
3 Likes
First bank in position
Fitted the board today, still a second one to make and some slight adjustments.
2 Likes
All 5 displays replaced now. I managed to solder a 24 pin chip the wrong way around 1-24 , 2 to 23 etc, so rather than rewire the chip I just bent all the pins through 180 and reinserted it, worked perfectly.
3 Likes
I am interested in those displays and the way they are controlled / accessed. So what I’ve seen so far there seem to be solutions with arduinos programmed in C, C++ or C#, with libraries between your code and the display.
Up to now I used HD44780 compatible displays I programmed directly with assembler. I would like to try this with those OLED displays you use as well to avoid arduinos in between, but I‘ve not found any tutorial yet nor any description how to access those OLED displays byte by byte to display something. Perhaps it would be too complicated or too much work to do so, but perhaps you know more. Thx…
Unfortunately not, they use standard SPI protocol and support the ST7789 device driver, so I guess that’s where you would start. I used a library to talk to them as of course why wouldn’t I.
