1280 x 400 HDMI display code for P2?

Comments

• refaQtor Posts: 174

  2025-09-14 04:48

  

  
• evanh Posts: 16,838

  2025-09-14 06:27 edited 2025-09-14 06:36

  Nope, but it should be viable. Modern HDMI monitors are often flexible on timings. Using minimum dot clock and blanking nets: 25 MHz / (1280 + 80 = 1360) / (400 + 20 = 420) = 43.8 Hz refresh.

  And of course they have scan converters built in so can accept lower resolution timings too. Ie: I'd expect 640x400, amongst others, to also work.
• refaQtor Posts: 174

  2025-09-14 07:23

  @evanh said:
  but it should be viable. Modern HDMI monitors are often flexible on timings.

  Thanks. I guess we'll find out. I have one on the way.
  I only just discovered those little 10" racks for mounting gear. seems like a perfect little flexible electronic testbench setup.
• Rayman Posts: 15,793

  2025-09-14 10:32

  10” rack? Don’t think have seen that before…

  All ours are 19”.
  Maybe could get two of those side by side on 19” rack…
• refaQtor Posts: 174

  2025-09-14 17:59

  @Rayman said:
  10” rack? Don’t think have seen that before…

  seems to be serving the Pi and other SBC mini-PC home network market with a variety of useful interchangable parts.
  P2 edge, I'd consider, is an SBC sized device with a clutter of interconnects and reconfiguration needs strewn about my bench un-manageabley at the moment. will certainly share how it comes out
• rogloh Posts: 6,094

  2025-10-19 23:30

  @evanh said:
  Nope, but it should be viable. Modern HDMI monitors are often flexible on timings. Using minimum dot clock and blanking nets: 25 MHz / (1280 + 80 = 1360) / (400 + 20 = 420) = 43.8 Hz refresh.

  And of course they have scan converters built in so can accept lower resolution timings too. Ie: I'd expect 640x400, amongst others, to also work.

  Neat. With those blanking intervals you may be able to get 50Hz output at a reasonable ~285 MHz P2 speed. Be neat to try it out on a P2 with DVI.
• refaQtor Posts: 174

  2025-10-19 23:42

  sorry folks, diverted to other projects and haven't given this display the necessary time. it is all mounted in the rack in front of me and it works well with the linux minipc I also have mounted in the rack to run SpinTools IDE to code a variety of P1 and P2 projects. at the moment hooking up a P1 with those X-Band motion sensors and an array of bedazzling lights and sirens to keep rodents out of my barn.