3 ms·

wow. this is amazing work, and answers a question I've had for a while. Thanks for putting this out there!

by jrexilius 4y ago

dmitrygr 4y ago
> and answers a question I've had for a while I am curious, which?
- geerlingguy 4y ago
  Possibly "is the Waveshare display really that bad?" — as someone who's implemented a few projects with it but suffered from its terrible existing driver support... I know it's nice to see a more in-depth explanation of what makes it bad (and creatively working around that) in this post.
- jrexilius 4y ago
  If it was possible to drive a touch interface and SPI display of that size from an MCU of that size/speed and still be responsive. I have only driven them from Pi Zeros, PocketBeagles and other much larger/faster systems, and still noticed some drag. Up to now, I've stuck to smaller displays without a touch layer for projects where I'm using the RP2040. [caveat: I am _not_ an embedded systems SWE so still figuring out where limitations are hardware vs. my knowledge]
  - dmitrygr 4y ago
    Now you can use that display too :) As the driver uses no CPU, CPU speed doesn’t matter
    - djmips 4y ago
      Impressive work. I hope the original designers of the RP2040 PIO system are well pleased.
      - ta988 4y ago
        I hope they are. I also hope their next generation will have more PIOs and ideally a bit more instructions.
        dmitrygr 4y ago
        I only have one wish for PIOv2 in future chips: wire it up to the AHBlite bus as a target, behind a small cache, so i can make my own QSPI iface (or 8xSPI, or 16xSPI, or SDRAM, etc)
  - HeyLaughingBoy 4y ago
    I mentioned upthread that I bought an ESP32-based DLC-32 3D printer/laser controller board. It uses a 2.4" TFT SPI display. Admittedly, I didn't use it for very long before reflashing it with my own test code, but the display seemed pretty responsive. I've been doing a lot of work with TFT_eSPI recently, but only on the display side (not using touch input) using the LVGL framework and it is very nice and smooth.
ta988 4y ago
The RP2040 is a really capable little microcontroller. http://wiki.picosystem.com/ http://wiki.picosystem.com/ https://kilograham.github.io/rp2040-doom/ https://kilograham.github.io/rp2040-doom/

wow. this is amazing work, and answers a question I've had for a while. Thanks for putting this out there!

dmitrygr 4y ago

> and answers a question I've had for a while I am curious, which?

geerlingguy 4y ago
Possibly "is the Waveshare display really that bad?" — as someone who's implemented a few projects with it but suffered from its terrible existing driver support... I know it's nice to see a more in-depth explanation of what makes it bad (and creatively working around that) in this post.
jrexilius 4y ago
If it was possible to drive a touch interface and SPI display of that size from an MCU of that size/speed and still be responsive. I have only driven them from Pi Zeros, PocketBeagles and other much larger/faster systems, and still noticed some drag. Up to now, I've stuck to smaller displays without a touch layer for projects where I'm using the RP2040. [caveat: I am _not_ an embedded systems SWE so still figuring out where limitations are hardware vs. my knowledge]
- dmitrygr 4y ago
  Now you can use that display too :) As the driver uses no CPU, CPU speed doesn’t matter
  - djmips 4y ago
    Impressive work. I hope the original designers of the RP2040 PIO system are well pleased.
    - ta988 4y ago
      I hope they are. I also hope their next generation will have more PIOs and ideally a bit more instructions.
      - dmitrygr 4y ago
        I only have one wish for PIOv2 in future chips: wire it up to the AHBlite bus as a target, behind a small cache, so i can make my own QSPI iface (or 8xSPI, or 16xSPI, or SDRAM, etc)
- HeyLaughingBoy 4y ago
  I mentioned upthread that I bought an ESP32-based DLC-32 3D printer/laser controller board. It uses a 2.4" TFT SPI display. Admittedly, I didn't use it for very long before reflashing it with my own test code, but the display seemed pretty responsive. I've been doing a lot of work with TFT_eSPI recently, but only on the display side (not using touch input) using the LVGL framework and it is very nice and smooth.

ta988 4y ago

The RP2040 is a really capable little microcontroller. http://wiki.picosystem.com/ http://wiki.picosystem.com/ https://kilograham.github.io/rp2040-doom/ https://kilograham.github.io/rp2040-doom/