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#!/usr/bin/env python3
# Copyright 2025 Giraut
# Copyright 2026 Johannes Schauer Marin Rodrigues
# SPDX-License-Identifier: MIT
#
# https://github.com/Giraut/mnt_reform_keyboard_backlight_rainbow
### Constants
keycap_widths = {
1: 17.5,
1.25: 17.5 * 1.25 + 0.1, # 21.975
1.5: 17.5 * 1.5 + 0.25, # 26.5
1.75: 31.3,
2: 17.5 * 2 + 0.5, # 35.5
}
classic_kbd_width = 260.65
classic_sizes = [
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.5],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.5],
[1.5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1.75, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.75],
[1.25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.25],
[1.25, 1.5, 1.5, 1.5, 2, 1.5, 1, 1, 1, 1, 1.25],
]
# ortholinear pocket reform
# yes, the pocket keyboard only has 5 rows and 12 columns but we need to send
# the full matrix of the big keyboard
pocket_sizes = [[1] * 14] * 6
# this is not the real pocket keyboard width but we make our live easier by
# re-using the default keycap sizes this way
pocket_kbd_width = 251.65
### Parameters
default_backlight_intensity = 50 # %
### Modules
import sys
import argparse
from time import time, sleep
import glob
try:
from setproctitle import setproctitle
except ModuleNotFoundError:
setproctitle = lambda a: True
### Routines
def flatten(xss):
return [x for xs in xss for x in xs]
def hsv_to_bgr(h: float, s: float, v: float) -> list:
if not s:
return [v, v, v]
if h == 1.0:
h = 0.0
i = int(h * 6.0)
f = h * 6.0 - i
w = int(v * (1.0 - s) * 255)
q = int(v * (1.0 - s * f) * 255)
t = int(v * (1.0 - s * (1.0 - f)) * 255)
v = int(255 * v)
match i:
case 0:
return [w, t, v]
case 1:
return [w, v, q]
case 2:
return [t, v, w]
case 3:
return [v, q, w]
case 4:
return [v, w, t]
case 5:
return [q, w, v]
def argparse_intensity_type(value):
"""Argparse type for a valid backlight intensity"""
try:
v = float(value)
except:
raise argparse.ArgumentTypeError("{}: invalid intensity".format(value))
if v < 0:
raise argparse.ArgumentTypeError("{}: intensity too low (min. 0%)".format(v))
if v > 100:
raise argparse.ArgumentTypeError("{}: intensity too high (max. 100%)".format(v))
return v
def argparse_delay_type(value):
"""Argparse type for a valid backlight refresh delay"""
try:
v = float(value)
except:
raise argparse.ArgumentTypeError("{}: invalid delay".format(value))
if v < 1:
raise argparse.ArgumentTypeError("{}: delay too low (min. 1s)".format(v))
return v
### Main routine
def main():
setproctitle("mnt_reform_keyboard_backlight_rainbow")
# Process the command line arguments
argparser = argparse.ArgumentParser()
argparser.add_argument(
"-i",
"--intensity",
type=argparse_intensity_type,
help="Backlight intensity (default: {}%%)".format(default_backlight_intensity),
default=default_backlight_intensity,
)
argparser.add_argument(
"-r",
"--refresh-every-sec",
type=argparse_delay_type,
help="Number of seconds between refreshes "
"(default: no refresh - set the pattern and exit)",
)
args = argparser.parse_args()
mnt_keyboard4_hidraw_device = None
# try hidraw devices until one matches
for name, sizes, kbd_width, g in [
(
"MNT Keyboard v4",
classic_sizes,
classic_kbd_width,
"/dev/input/by-id/usb-MNT_Research_MNT_Reform_Keyboard_4.0_*-hidraw",
),
(
"MNT Pocket Reform Keyboard",
pocket_sizes,
pocket_kbd_width,
"/dev/input/by-id/usb-MNT_Pocket_Reform_Input_1.0_*-hidraw",
),
]:
matches = glob.glob(g)
if len(matches) != 1:
continue
mnt_keyboard4_hidraw_device = matches[0]
print(f"Found {name}")
break
if mnt_keyboard4_hidraw_device is None:
print("unable to find hidraw device")
exit(1)
offsets = []
for row in sizes:
row_offsets = []
offset_x = -17.5 / 2
for u in row:
offset_x += keycap_widths[u] / 2
row_offsets.append(round(offset_x, 3))
offset_x += keycap_widths[u] / 2
offset_x += 1.1
assert 0 <= offset_x <= kbd_width, offset_x
offsets.append(row_offsets)
max_num_retries = 5
# Set the color of the backlight LEDs then exit, or run the animation
while True:
# Set the LEDs
num_steps = 1000
for seq in range(num_steps):
start_backlight_change_tstamp = time()
num_retries = 0
row = 0
while row < len(offsets):
row_offsets = offsets[row]
data = b"xXRGB" + bytes(
[row]
+ flatten(
hsv_to_bgr(
(((offset - 17.5 / 4 * row) / kbd_width) + seq / num_steps)
% 1,
1.0,
args.intensity / 100,
)
for offset in row_offsets
)
)
try:
with open(mnt_keyboard4_hidraw_device, "wb") as k:
k.write(data)
row += 1
num_retries = 0
except PermissionError:
print(
f"Unable to open {mnt_keyboard4_hidraw_device} for writing: permission denied"
)
exit(1)
except BrokenPipeError:
print(
f"Unable to write to {mnt_keyboard4_hidraw_device}: broken pipe -- wrong device?"
)
num_retries += 1
if num_retries > max_num_retries:
print("failed too often")
exit(1)
sleep(0.15) # Give the keyboard controller a chance to do its thing
# Exit if we're not doing an animation
if args.refresh_every_sec is None:
return 0
# Sleep until the next refresh
sleep(
max(
0, args.refresh_every_sec - (time() - start_backlight_change_tstamp)
)
)
### Main program
if __name__ == "__main__":
sys.exit(main())
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