Implement grayscale support

[HDR]

Adds grayscale support for displays like GDEW0154T8D, based on https://github.com/adafruit/Adafruit_CircuitPython_IL0373/blob/main/adafruit_il0373.py

Test image used (github doesn't allow .bmp):

[tekktrik]

Hi @HDR! Thanks for the submission! It looks like the Github Actions CI had an issue with some of the formatting. You can use pre-commit locally to auto-format everything and then submit a commit with the changes. That will fix the CI error!

If you aren't familiar with using pre-commit, here's a tutorial that should help you get setup with it: https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/check-your-code

[HDR]

Looks like Sphinx is throwing an error now instead

[tekktrik]

Looks like this is the problem:

[HDR]

Looks like this is the problem:

Yep, already resolved it

[tekktrik]

2fast4me 😆

[tekktrik]

Unfortunately I don't have the hardware to test, but just wanted to help with everything preceding!

[ladyada]

nice work @HDR and thank you @tekktrik for helping shephard
@HDR can you add an example like the one photo'd so folks can try it?

[HDR]

nice work @HDR and thank you @tekktrik for helping shephard @HDR can you add an example like the one photo'd so folks can try it?

Sure, i currently have this hooked up to Raspberry Pi Pico, example.zip contains a bmp and the example code.

import time
import board
import displayio
import busio
import adafruit_uc8151d

displayio.release_displays()

clk = board.GP10
si = board.GP11
dc = board.GP8
cs = board.GP9
rst = board.GP12
busy = board.GP13

display_bus = displayio.FourWire(
    busio.SPI(clk, si), command=dc, chip_select=cs, reset=rst, baudrate=1000000
)

time.sleep(1)

display = adafruit_uc8151d.UC8151D(
    display_bus, width=152, height=152, busy_pin=busy, rotation=180, grayscale=True
)


pic = displayio.OnDiskBitmap('Grayscale.bmp')
g = displayio.Group()
t = displayio.TileGrid(pic, pixel_shader=pic.pixel_shader)
g.append(t)
display.show(g)
display.refresh()

Example.zip

[ladyada]

instead of a bmp, could you rework the example to draw 4 rectangles/bitmap tiles that have a similar pattern? that way we dont have a file dependancy

[HDR]

instead of a bmp, could you rework the example to draw 4 rectangles/bitmap tiles that have a similar pattern? that way we dont have a file dependancy

Here is a quick and simple example that does not depend on a bmp :)

import time
import board
import displayio
import busio
import adafruit_uc8151d

displayio.release_displays()

clk = board.GP10
si = board.GP11
dc = board.GP8
cs = board.GP9
rst = board.GP12
busy = board.GP13

display_bus = displayio.FourWire(
    busio.SPI(clk, si), command=dc, chip_select=cs, reset=rst, baudrate=1000000
)

time.sleep(1)

display = adafruit_uc8151d.UC8151D(
    display_bus, width=152, height=152, busy_pin=busy, rotation=180, grayscale=True
)


bitmap = displayio.Bitmap(152, 152, 4)

# Draw Black
for x in range(0,152):
    for y in range(0,38):
        bitmap[x, y] = 0
#Draw Dark Gray
for x in range(0,152):
    for y in range(38,76):
        bitmap[x, y] = 1
#Draw Light Gray
for x in range(0,152):
    for y in range(76,114):
        bitmap[x, y] = 2
#Draw White
for x in range(0,152):
    for y in range(114,152):
        bitmap[x, y] = 3

palette = displayio.Palette(4)
palette[0] = 0x000000 # Black
palette[1] = 0x404040 # Dark Gray
palette[2] = 0x808080 # Light Gray
palette[3] = 0xFFFFFF # White

g = displayio.Group()
t = displayio.TileGrid(bitmap, pixel_shader=palette)
g.append(t)
display.show(g)
display.refresh()

[ladyada]

perfect, can you add that to the PR as a new file? then we'll merge it together

[HDR]

Hopefully the Copyright and License stuff is correct, if not please let me know :)

[ladyada]

ya got it, nice work!!!!