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CircuitPython (7.x.x and above) code for a TADA-68 style keyboard with a Raspberry Pi Pico controller.
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# Copyright wulfboy_95 2022, All Rights Reserved. | |
# Copying and distribution of this file, with or without modification, | |
# are permitted in any medium without royalty provided the copyright | |
# notice and this notice are preserved. This file is offered as-is, | |
# without any warranty. | |
import board | |
import keypad | |
import struct | |
import usb_hid | |
from adafruit_hid.keyboard import Keycode | |
# Create and init keyboard USB HID device. | |
keeb = None | |
for dev in list(usb_hid.devices): | |
if ((dev.usage == 0x06) and | |
(dev.usage_page == 0x01) and | |
hasattr(dev, "send_report")): | |
keeb = dev | |
if keeb == None: | |
raise Exception("Device cannot be found") | |
matrix = keypad.KeyMatrix( | |
row_pins = ( | |
board.GP6, board.GP7, board.GP8, board.GP9, board.GP10 | |
), | |
column_pins = ( | |
board.GP11, board.GP12, board.GP13, board.GP14, board.GP15, | |
board.GP16, board.GP17, board.GP18, board.GP19, board.GP20, | |
board.GP21, board.GP22, board.GP26, board.GP27, board.GP28 | |
), | |
columns_to_anodes=True | |
) | |
# Key list to convert key_number from KeyMatrix events to the corresponding keycode. | |
keys_list = [ | |
Keycode.ESCAPE, Keycode.ONE, Keycode.TWO, Keycode.THREE, Keycode.FOUR, Keycode.FIVE, Keycode.SIX, Keycode.SEVEN, | |
Keycode.EIGHT, Keycode.NINE, Keycode.ZERO, Keycode.MINUS, Keycode.EQUALS, Keycode.BACKSPACE, Keycode.GRAVE_ACCENT, | |
Keycode.TAB, Keycode.Q, Keycode.W, Keycode.E, Keycode.R, Keycode.T, Keycode.Y, Keycode.U, Keycode.I, Keycode.O, | |
Keycode.P, Keycode.LEFT_BRACKET, Keycode.RIGHT_BRACKET, Keycode.BACKSLASH, Keycode.DELETE, Keycode.CAPS_LOCK, | |
Keycode.A, Keycode.S, Keycode.D, Keycode.F, Keycode.G, Keycode.H, Keycode.J, Keycode.K, Keycode.L, Keycode.SEMICOLON, | |
Keycode.QUOTE, Keycode.RETURN, Keycode.ENTER, Keycode.HOME, Keycode.LEFT_SHIFT, Keycode.SHIFT, Keycode.Z, Keycode.X, | |
Keycode.C, Keycode.V, Keycode.B, Keycode.N, Keycode.M, Keycode.COMMA, Keycode.PERIOD, Keycode.FORWARD_SLASH, | |
Keycode.RIGHT_SHIFT, Keycode.UP_ARROW, Keycode.END, Keycode.LEFT_CONTROL, Keycode.LEFT_GUI, Keycode.LEFT_ALT, | |
Keycode.SPACE, Keycode.SPACE, Keycode.SPACE, Keycode.SPACEBAR, Keycode.SPACE, Keycode.SPACE, Keycode.RIGHT_ALT, | |
Keycode.RIGHT_GUI, Keycode.RIGHT_CONTROL, Keycode.LEFT_ARROW, Keycode.DOWN_ARROW, Keycode.RIGHT_ARROW | |
] # TODO: use a dictionary instead of a list so that unused buttons do not need placeholders. | |
keys_pressed = [] | |
modifiers_pressed = [] | |
report_array = [0x00] * 8 | |
while True: | |
while matrix.events: # Run when there are events queued. | |
event = matrix.events.get() | |
key = keys_list[event.key_number] | |
if event.pressed: | |
if key >= 0xE0: # Check if modifier is pressed. | |
modifiers_pressed.append(key) # Add to modifiers_pressed list. | |
else: # Check if a key is pressed. | |
keys_pressed.append(key) | |
if event.released: | |
if key in keys_pressed: | |
keys_pressed.remove(key) | |
if key in modifiers_pressed: | |
modifiers_pressed.remove(key) | |
if len(keys_pressed) > 6: # Check for Rollover Error. | |
for i in range(2,8): | |
report_array[i] = 0x01 # Add Rollover Error keycode*6 to report. | |
else: | |
for i in modifiers_pressed: | |
report_array[0] |= Keycode.modifier_bit(i) # Add modifiers to report. | |
for i in range(6): | |
report_array[i+2] = keys_pressed[i] if i < len(keys_pressed) else 0 # Add keycode to report. | |
keeb.send_report(struct.pack("8B",*report_array)) | |
report_array = [0x00] * 8 |
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Hi @dismas666, the Pico W is not available in my country yet but I'll definitely try out writing a wireless version when I can get my hands on one.
In the meantime, I've started working on an app that can generate keypad matrices from keyboard layouts designed using KeyboardLayoutEditor. It will also include a new version of this code which would grab
matrix
andkeys_list
from a config file rather than having it hard-coded.Edit (16/11/22): I've gotten my hands on a Pico W. Since Bluetooth has not been enabled yet, this would have to wait.