piit79 · December 18, 2024 09:00 · Dec 18, 2024
diff --git a/code.py b/code.py
@@ -0,0 +1,81 @@
+import board
+import digitalio
+import usb_hid
+from time import sleep
+
+# from adafruit_hid.keyboard import Keyboard
+# from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
+
+
+LOOP_INTERVAL = 50  # milliseconds
+
+
+class CachedDigitalInput:
+    def __init__(self, pin, name=None, pull=digitalio.Pull.UP):
+        self.pin = pin
+        self.name = name
+        self.io = digitalio.DigitalInOut(pin)
+        self.io.pull = pull
+        self.value_prev = False
+
+    @property
+    def value(self) -> bool:
+        return self.io.value
+
+    @property
+    def value_str(self) -> str:
+        return 'HIGH' if self.value else 'LOW'
+
+    @property
+    def changed(self) -> bool:
+        return self.value != self.value_prev
+
+    def save(self):
+        self.value_prev = self.value
+
+
+def xr(start: int, end: int):
+    """Return an inclusive range of integers in a list"""
+    return list(range(start, end+1))
+
+
+def log(*args):
+    s = ' '.join(str(arg) for arg in args)
+    print(s)
+    # keyboard_layout.write(s + "\n")
+
+
+# sleep(1)  # Sleep for a bit to avoid a race condition on some systems
+# keyboard = Keyboard(usb_hid.devices)
+# keyboard_layout = KeyboardLayoutUS(keyboard)  # We're in the US :)
+
+pin_numbers = xr(0, 9) + xr(12, 16) + xr(20, 23) + xr(26, 29)
+pin_names = [f'D{pn}' for pn in pin_numbers]
+pins = []
+
+led = digitalio.DigitalInOut(board.LED)
+led.direction = digitalio.Direction.OUTPUT
+flash_duration = 50    # milliseconds
+flash_interval = 1000  # milliseconds
+off_duration = flash_interval - flash_duration
+interval = flash_interval - flash_duration
+
+for pin_name in pin_names:
+    pin_def = getattr(board, pin_name)
+    i = CachedDigitalInput(pin_def, name=pin_name)
+    i.value_prev = False
+    pins.append(i)
+
+ms = 0
+while True:
+    for i in pins:
+        if i.changed:
+            log(f'{i.name:-3}', i.value_str)
+            i.save()
+
+    if ms >= off_duration if not led.value else flash_duration:
+        led.value = not led.value
+        ms = 0
+
+    sleep(LOOP_INTERVAL / 1000.0)
+    ms += LOOP_INTERVAL
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