Support ST7920 display

[Misiu]

Describe the problem you have/What new integration you would like

Consider adding support for the ST7920 display. It is a good alternative for SSD1325.
Please describe your use case for this integration and alternatives you've tried:

The use case is fairly simple, I'd like to be able to use ST7920 with ESP Home
Additional context

The recent version of ESP8266 library (2.5.1) supports hardware SPI (esp8266/Arduino#5948), display code already exists, so it shouldn't be hard for someone with good knowledge of this awesome project.

Useful links:
olikraus/u8g2#843

[Misiu]

I'm trying to add support for this. I have 128x64 ST7920 display so I'll be able to test just this one (there are other sizes).
I've created the first version by copying code for SSD1325 - Misiu/esphome@a770bb1
I need some guidance with the setup code.
I'm sure ST7920 is different from SSD1325, so that code must be changed.
https://github.com/olikraus/u8g2 has support for that display - https://github.com/olikraus/u8g2/blob/master/csrc/u8x8_d_ist7920.c

What commands I should send to correctly set up the display? Where I should search for them?
Manual (https://www.lcd-module.de/eng/pdf/zubehoer/st7920_chinese.pdf)?

@OttoWinter any hints?

[Misiu]

Ref: https://thesolaruniverse.wordpress.com/2020/06/09/esp8266-and-st7920-powered-12864-liquid-crystal-display-in-a-test-bench/
@kbx81 maybe you could help with this? 🙏

[kbx81]

Yes, I can probably help. I'll take a look at your branch later today or tomorrow.

[moskovskiy82]

Any update on this one? Also interested in this.

[kbx81]

Sorry -- been distracted with some other project. I'll circle back before too much longer. 😇

[nicolaij]

Try it https://github.com/nicolaij/esphome_heater

[Misiu]

there is a PR: esphome/esphome#1440
could you give this a try? I'm waiting for a new display so I can help with testing.

[Misiu]

@moskovskiy82 did you try the code from the PR I mentioned?

[matphillips]

any progress on this? I have one of these displays and it would be nice to put it to use.
Thanks.

[marsjan155]

My PR was merged
esphome/esphome#1440
My LCD works with this code, maybe someone else can check and confirm

[matphillips]

Oh, great! Recently too it seems!
I'll be sure to check it when it's in release, but I'm not sure how to use the pre-release versions. If there's some instructions somewhere, I can try to test it today, but otherwise I'm find to continue to wait. Glad I didn't throw the screen away :)

[kbx81]

Docs are here: https://next.esphome.io/components/display/st7920.html

Closing the FR since the component was merged and docs added. 😄🚀

[marsjan155]

@matphillips check this
https://esphome.io/guides/faq.html#how-do-i-use-the-latest-bleeding-edge-version