Merge pull request #2282 from jepler/tandy1000-keyboard

Tandy1000 keyboard

Author: TheKitty

CircuitPython_Tandy1000Keyboard_QTPy_RP2040/code.py

@@ -0,0 +1,158 @@
+# SPDX-FileCopyrightText: 2022 Jeff Epler for Adafruit Industries
+# SPDX-License-Identifier: MIT
+import time
+import array
+
+import board
+import digitalio
+import rp2pio
+import usb_hid
+
+import adafruit_pioasm
+from adafruit_hid.keyboard import Keyboard
+from adafruit_hid.keycode import Keycode as K
+
+KBD_NRESET = board.MISO
+KBD_DATA = board.RX
+KBD_CLOCK = board.SCK # Note that KBD_CLOCK must be 1 GPIO# above KBD_DATA
+KBD_NBUSY = board.MOSI
+
+tandy1000_keycodes = [
+    None, K.ESCAPE, K.ONE, K.TWO, K.THREE, K.FOUR, K.FIVE, K.SIX, K.SEVEN,
+    K.EIGHT, K.NINE, K.ZERO, K.MINUS, K.EQUALS, K.BACKSPACE, K.TAB, K.Q, K.W,
+    K.E, K.R, K.T, K.Y, K.U, K.I, K.O, K.P, K.LEFT_BRACKET, K.RIGHT_BRACKET,
+    K.ENTER, K.LEFT_CONTROL, K.A, K.S, K.D, K.F, K.G, K.H, K.J, K.K, K.L,
+    K.SEMICOLON, K.QUOTE, K.UP_ARROW, K.LEFT_SHIFT, K.LEFT_ARROW, K.Z, K.X,
+    K.C, K.V, K.B, K.N, K.M, K.COMMA, K.PERIOD, K.FORWARD_SLASH, K.RIGHT_SHIFT,
+    K.PRINT_SCREEN, K.LEFT_ALT, K.SPACE, K.CAPS_LOCK, K.F1, K.F2, K.F3, K.F4,
+    K.F5, K.F6, K.F7, K.F8, K.F9, K.F10, K.KEYPAD_NUMLOCK, K.PAUSE,
+    K.KEYPAD_SEVEN, K.KEYPAD_EIGHT, K.KEYPAD_NINE, K.DOWN_ARROW, K.KEYPAD_FOUR,
+    K.KEYPAD_FIVE, K.KEYPAD_SIX, K.RIGHT_ARROW, K.KEYPAD_ONE, K.KEYPAD_TWO,
+    K.KEYPAD_THREE, K.KEYPAD_ZERO, K.KEYPAD_MINUS, (K.LEFT_CONTROL, K.PAUSE),
+    K.KEYPAD_PLUS, K.KEYPAD_PERIOD, K.KEYPAD_ENTER, K.HOME, K.F11, K.F12
+]
+
+LOCK_KEYS = (K.CAPS_LOCK, K.KEYPAD_NUMLOCK)
+LOCK_STATE = {
+    K.CAPS_LOCK: False,
+    K.KEYPAD_NUMLOCK: False,
+}
+KEYPAD_NUMLOCK_LOOKUP = [
+    {
+        K.KEYPAD_PLUS: K.INSERT,
+        K.KEYPAD_MINUS: K.DELETE,
+
+        K.KEYPAD_SEVEN: K.BACKSLASH,
+        K.KEYPAD_EIGHT: (K.LEFT_SHIFT, K.GRAVE_ACCENT),
+        K.KEYPAD_NINE: K.PAGE_UP,
+
+        K.KEYPAD_FOUR: (K.LEFT_SHIFT, K.BACKSLASH),
+        #K.KEYPAD_FIVE:
+        #K.KEYPAD_SIX:
+
+        K.KEYPAD_ONE: K.END,
+        K.KEYPAD_TWO: K.GRAVE_ACCENT,
+        K.KEYPAD_THREE: K.PAGE_DOWN,
+
+        K.KEYPAD_ZERO: K.ZERO,
+        K.KEYPAD_PERIOD: K.PERIOD,
+    },
+    {
+        K.KEYPAD_PLUS: (K.LEFT_SHIFT, K.EQUALS),
+        K.KEYPAD_MINUS: K.MINUS,
+
+        K.KEYPAD_SEVEN: K.SEVEN,
+        K.KEYPAD_EIGHT: K.EIGHT,
+        K.KEYPAD_NINE: K.NINE,
+
+        K.KEYPAD_FOUR: K.FOUR,
+        K.KEYPAD_FIVE: K.FIVE,
+        K.KEYPAD_SIX: K.SIX,
+
+        K.KEYPAD_ONE: K.ONE,
+        K.KEYPAD_TWO: K.TWO,
+        K.KEYPAD_THREE: K.THREE,
+
+        K.KEYPAD_ZERO: K.ZERO,
+        K.KEYPAD_PERIOD: K.PERIOD,
+    }
+]
+
+# Assert busy
+busy_out = digitalio.DigitalInOut(KBD_NBUSY)
+busy_out.switch_to_output(False, digitalio.DriveMode.OPEN_DRAIN)
+
+# Reset the keyboard
+reset_out = digitalio.DigitalInOut(KBD_NRESET)
+reset_out.switch_to_output(False, digitalio.DriveMode.OPEN_DRAIN)
+time.sleep(.1)
+reset_out.value = True
+
+program = adafruit_pioasm.Program("""
+    wait 1 pin 1
+    in pins, 1
+    wait 0 pin 1
+""")
+
+sm = rp2pio.StateMachine(program.assembled,
+    first_in_pin = KBD_DATA,
+    in_pin_count = 2,
+    pull_in_pin_up = 0b11,
+    auto_push=True,
+    push_threshold=8,
+    in_shift_right=True,
+    frequency=8_000_000,
+    **program.pio_kwargs)
+
+buf = array.array('B', [0])
+
+MASK_LEFT_SHIFT = K.modifier_bit(K.LEFT_SHIFT)
+MASK_RIGHT_SHIFT = K.modifier_bit(K.RIGHT_SHIFT)
+MASK_ANY_SHIFT = (MASK_LEFT_SHIFT | MASK_RIGHT_SHIFT)
+
+# Now ready to get keystrokes
+kbd = Keyboard(usb_hid.devices)
+busy_out.value = True
+while True:
+    sm.readinto(buf, swap=False)
+    val = buf[0]
+    pressed = (val & 0x80) == 0
+    key_number = val & 0x7f
+
+    if key_number > len(tandy1000_keycodes):
+        # invalid keycode -- reset the keyboard
+        reset_out.switch_to_output(False, digitalio.DriveMode.OPEN_DRAIN)
+        time.sleep(.1)
+        reset_out.value = True
+        continue
+
+    keycode = tandy1000_keycodes[key_number]
+    if keycode is None:
+        continue
+    keycode = KEYPAD_NUMLOCK_LOOKUP[LOCK_STATE[K.KEYPAD_NUMLOCK]].get(keycode, keycode)
+    if pressed:
+        if keycode in LOCK_KEYS:
+            LOCK_STATE[keycode] = True
+        elif LOCK_STATE[K.CAPS_LOCK] and K.A <= keycode <= K.Z:
+            old_report_modifier = kbd.report_modifier[0]
+            kbd.report_modifier[0] = (old_report_modifier & ~MASK_RIGHT_SHIFT) ^ MASK_LEFT_SHIFT
+            kbd.press(keycode)
+            kbd.release_all()
+            kbd.report_modifier[0] = old_report_modifier
+            continue
+        elif isinstance(keycode, tuple):
+            old_report_modifier = kbd.report_modifier[0]
+            kbd.report_modifier[0] = 0
+            kbd.press(*keycode)
+            kbd.release_all()
+            kbd.report_modifier[0] = old_report_modifier
+        else:
+            kbd.press(keycode)
+
+    else:
+        if keycode in LOCK_KEYS:
+            LOCK_STATE[keycode] = False
+        elif isinstance(keycode, tuple):
+            pass
+        else:
+            kbd.release(keycode)