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KeyPad API

Overview​

The KeyPad system in MatrixOS provides access to the 8x8 pressure-sensitive keypad input. It handles key events, pressure levels, and coordinate mapping between the physical keys and LED matrix. The KeyPad API is available as MatrixOS.KeyPad and is imported by default.

The API returns KeyEvent objects containing information about key presses, releases, and hold states, along with pressure data for pressure-sensitive devices.

The Python KeyPad API is implemented in Applications/Python/PikaPython/MatrixOS_MatrixOS.KeyPad.py with type hints in Applications/Python/PikaPython/_MatrixOS_MatrixOS.KeyPad.pyi.

MatrixOS.KeyPad.Get​

def Get(timeout_ms: int = 0) -> any

Gets the next key event from the input queue.

Parameters:

  • timeout_ms (int, optional): Timeout in milliseconds to wait for input (defaults to 0 for no timeout)

Returns:

  • KeyEvent: Key event object on success
  • None: On timeout or no input available

Example:

# Wait up to 1 second for input
key_event = MatrixOS.KeyPad.Get(1000)
if key_event is not None:
    print(f"Key pressed at ({key_event.xy.x}, {key_event.xy.y})")

MatrixOS.KeyPad.GetKey​

def GetKey(keyXY: Point) -> any

Gets the current state of a specific key by coordinates.

Parameters:

  • keyXY (Point): Key coordinates (0-7 for both x and y)

Returns:

  • KeyInfo: Key information object if valid position
  • None: If invalid coordinates

Example:


key_info = MatrixOS.KeyPad.GetKey(Point(0, 0))
if key_info is not None:
    print(f"Key pressure: {key_info.pressure}")
    print(f"Key state: {key_info.state}")

MatrixOS.KeyPad.GetKeyByID​

def GetKeyByID(keyID: int) -> any

Gets the current state of a specific key by ID.

Parameters:

  • keyID (int): Key ID (0-63 for 8x8 matrix)

Returns:

  • KeyInfo: Key information object if valid ID
  • None: If invalid key ID

Example:

# Get state of first key (top-left)
key_info = MatrixOS.KeyPad.GetKeyByID(0)
if key_info is not None:
    if key_info.state == 1:  # Key is pressed
        print("Top-left key is pressed")

MatrixOS.KeyPad.Clear​

def Clear() -> None

Clears the key event queue, discarding any pending events.

Example:

MatrixOS.KeyPad.Clear()  # Clear all pending key events

MatrixOS.KeyPad.XY2ID​

def XY2ID(xy: Point) -> int

Converts key coordinates to key ID.

Parameters:

  • xy (Point): Key coordinates

Returns:

  • int: Key ID (0-63), or -1 if invalid coordinates

Example:

key_id = MatrixOS.KeyPad.XY2ID(Point(2, 3))
print(f"Key at (2,3) has ID: {key_id}")  # Output: Key at (2,3) has ID: 26

MatrixOS.KeyPad.ID2XY​

def ID2XY(keyID: int) -> any

Converts key ID to coordinates.

Parameters:

  • keyID (int): Key ID (0-63)

Returns:

  • Point: Key coordinates if valid ID
  • None: If invalid key ID

Example:

coords = MatrixOS.KeyPad.ID2XY(26)
if coords is not None:
    print(f"Key ID 26 is at ({coords.x}, {coords.y})")  # Output: Key ID 26 is at (2, 3)

Key Event Handling​

Basic Event Loop​

while True:
    key_event = MatrixOS.KeyPad.Get(100)  # 100ms timeout
    if key_event is not None:
        x, y = key_event.xy.x, key_event.xy.y

        if key_event.state == KeyState.PRESSED:
            print(f"Key pressed at ({x}, {y})")
        elif key_event.state == KeyState.RELEASED:
            print(f"Key released at ({x}, {y})")
        elif key_event.state == KeyState.HOLD:
            print(f"Key held at ({x}, {y})")

Pressure-Sensitive Input​

# Monitor pressure levels
key_event = MatrixOS.KeyPad.Get(1000)
if key_event is not None:
    pressure = key_event.pressure
    if pressure > 200:
        print("Hard press detected!")
    elif pressure > 100:
        print("Medium press")
    else:
        print("Light press")

Coordinate Mapping​

# Convert between coordinate systems

# Map 8x8 grid coordinates
for row in range(8):
    for col in range(8):
        key_id = MatrixOS.KeyPad.XY2ID(Point(col, row))
        print(f"Position ({col}, {row}) = Key ID {key_id}")

# Reverse mapping
for key_id in range(64):
    coords = MatrixOS.KeyPad.ID2XY(key_id)
    if coords is not None:
        print(f"Key ID {key_id} = Position ({coords.x}, {coords.y})")

Real-time Key State Monitoring​

import time

# Monitor specific keys
keys_to_watch = [Point(0, 0), Point(7, 7), Point(3, 3)]

while True:
    for key_pos in keys_to_watch:
        key_info = MatrixOS.KeyPad.GetKey(key_pos)
        if key_info is not None and key_info.state == 1:
            print(f"Key at ({key_pos.x}, {key_pos.y}) is pressed with pressure {key_info.pressure}")

    time.sleep(0.01)  # 10ms polling

Key States​

The KeyState enum defines the possible key states:

  • KeyState.IDLE (0): Key is not pressed
  • KeyState.PRESSED (1): Key was just pressed
  • KeyState.RELEASED (2): Key was just released
  • KeyState.HOLD (3): Key is being held down

Coordinate System​

The keypad uses a standard coordinate system:

  • Origin (0,0): Top-left corner
  • X-axis: Increases from left to right (0-7)
  • Y-axis: Increases from top to bottom (0-7)
  • Key IDs: Linear mapping where ID = Y * 8 + X

Performance Tips​

  1. Use timeouts: Always specify reasonable timeouts for Get() to avoid blocking
  2. Clear queue: Use Clear() when starting new input modes to avoid stale events
  3. Cache coordinates: Pre-calculate coordinate mappings for frequently accessed keys
  4. Batch processing: Process multiple events in a loop rather than one at a time

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