292 lines
8.4 KiB
Python
292 lines
8.4 KiB
Python
'''
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Extension handles usage of Trackball Breakout by Pimoroni
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Product page: https://shop.pimoroni.com/products/trackball-breakout
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'''
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from micropython import const
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import math
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import struct
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from kmk.keys import make_key
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from kmk.kmktime import PeriodicTimer
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from kmk.modules import Module
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from kmk.modules.mouse_keys import PointingDevice
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I2C_ADDRESS = 0x0A
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I2C_ADDRESS_ALTERNATIVE = 0x0B
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CHIP_ID = 0xBA11
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VERSION = 1
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REG_LED_RED = 0x00
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REG_LED_GRN = 0x01
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REG_LED_BLU = 0x02
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REG_LED_WHT = 0x03
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REG_LEFT = 0x04
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REG_RIGHT = 0x05
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REG_UP = 0x06
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REG_DOWN = 0x07
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REG_SWITCH = 0x08
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MSK_SWITCH_STATE = 0b10000000
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REG_USER_FLASH = 0xD0
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REG_FLASH_PAGE = 0xF0
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REG_INT = 0xF9
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MSK_INT_TRIGGERED = 0b00000001
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MSK_INT_OUT_EN = 0b00000010
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REG_CHIP_ID_L = 0xFA
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RED_CHIP_ID_H = 0xFB
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REG_VERSION = 0xFC
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REG_I2C_ADDR = 0xFD
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REG_CTRL = 0xFE
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MSK_CTRL_SLEEP = 0b00000001
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MSK_CTRL_RESET = 0b00000010
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MSK_CTRL_FREAD = 0b00000100
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MSK_CTRL_FWRITE = 0b00001000
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ANGLE_OFFSET = 0
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class TrackballMode:
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'''Behaviour mode of trackball: mouse movement or vertical scroll'''
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MOUSE_MODE = const(0)
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SCROLL_MODE = const(1)
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class TrackballLayer:
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'''Just to show an interface for layers'''
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def handle(self, keyboard, trackball, x, y, switch, state):
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raise NotImplementedError
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class PointingLayer(TrackballLayer):
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'''the default behavior: act as trackball'''
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def handle(self, keyboard, trackball, x, y, switch, state):
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if trackball.mode == TrackballMode.MOUSE_MODE:
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if x >= 0:
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trackball.pointing_device.report_x[0] = x
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else:
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trackball.pointing_device.report_x[0] = 0xFF & x
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if y >= 0:
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trackball.pointing_device.report_y[0] = y
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else:
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trackball.pointing_device.report_y[0] = 0xFF & y
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trackball.pointing_device.hid_pending = x != 0 or y != 0
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else: # SCROLL_MODE
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trackball.pointing_device.report_w[0] = y
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trackball.pointing_device.hid_pending = y != 0
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if switch == 1: # Button pressed
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trackball.pointing_device.button_status[
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0
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] |= trackball.pointing_device.MB_LMB
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trackball.pointing_device.hid_pending = True
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if not state and trackball.previous_state is True: # Button released
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trackball.pointing_device.button_status[
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0
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] &= ~trackball.pointing_device.MB_LMB
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trackball.pointing_device.hid_pending = True
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trackball.previous_state = state
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class KeyLayer(TrackballLayer):
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'''Act like an encoder.'''
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x = 0
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y = 0
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def __init__(self, up, right, down, left, press, axis_snap=0.25, steps=8):
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self.up = up
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self.right = right
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self.down = down
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self.left = left
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self.press = press
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'''snap to axis. the higher the value, the more we snap to the dominant direction'''
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self.axis_snap = axis_snap
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'''how many px we move to trigger a key tap, less means more key taps'''
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self.steps = steps
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def handle(self, keyboard, trackball, x, y, switch, state):
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if y and abs(x / y) < self.axis_snap:
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x = 0
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if x and abs(y / x) < self.axis_snap:
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y = 0
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self.x += x
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self.y += y
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x_taps = self.x // self.steps
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y_taps = self.y // self.steps
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self.x %= self.steps
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self.y %= self.steps
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for i in range(x_taps, 0, 1):
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keyboard.tap_key(self.left)
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for i in range(x_taps, 0, -1):
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keyboard.tap_key(self.right)
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for i in range(y_taps, 0, 1):
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keyboard.tap_key(self.up)
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for i in range(y_taps, 0, -1):
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keyboard.tap_key(self.down)
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if switch and state:
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keyboard.tap_key(self.press)
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class Trackball(Module):
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'''Module handles usage of Trackball Breakout by Pimoroni'''
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def __init__(
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self,
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i2c,
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mode=TrackballMode.MOUSE_MODE,
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address=I2C_ADDRESS,
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angle_offset=ANGLE_OFFSET,
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layers=None,
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):
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self.angle_offset = angle_offset
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if layers is None:
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layers = [PointingLayer()]
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self._i2c_address = address
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self._i2c_bus = i2c
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self.pointing_device = PointingDevice()
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self.mode = mode
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self.previous_state = False # click state
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self.layers = layers
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self.polling_interval = 20
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chip_id = struct.unpack('<H', bytearray(self._i2c_rdwr([REG_CHIP_ID_L], 2)))[0]
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if chip_id != CHIP_ID:
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raise RuntimeError(
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'Invalid chip ID: 0x{:04X}, expected 0x{:04X}'.format(chip_id, CHIP_ID)
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)
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make_key(
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names=('TB_MODE',),
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on_press=self._tb_mode_press,
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on_release=self._tb_mode_press,
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)
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def during_bootup(self, keyboard):
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self._timer = PeriodicTimer(self.polling_interval)
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def before_matrix_scan(self, keyboard):
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'''
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Return value will be injected as an extra matrix update
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'''
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if not self._timer.tick():
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return
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up, down, left, right, switch, state = self._read_raw_state()
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x, y = self._calculate_movement(right - left, down - up)
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layer = self.layers[-1]
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active_layer = keyboard.active_layers[0]
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if len(self.layers) > active_layer:
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layer = self.layers[active_layer]
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layer.handle(keyboard, self, x, y, switch, state)
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return
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def after_matrix_scan(self, keyboard):
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return
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def before_hid_send(self, keyboard):
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return
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def after_hid_send(self, keyboard):
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if self.pointing_device.hid_pending:
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keyboard._hid_helper.hid_send(self.pointing_device._evt)
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self._clear_pending_hid()
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return
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def on_powersave_enable(self, keyboard):
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return
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def on_powersave_disable(self, keyboard):
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return
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def set_rgbw(self, r, g, b, w):
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'''Set all LED brightness as RGBW.'''
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self._i2c_rdwr([REG_LED_RED, r, g, b, w])
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def set_red(self, value):
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'''Set brightness of trackball red LED.'''
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self._i2c_rdwr([REG_LED_RED, value & 0xFF])
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def set_green(self, value):
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'''Set brightness of trackball green LED.'''
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self._i2c_rdwr([REG_LED_GRN, value & 0xFF])
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def set_blue(self, value):
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'''Set brightness of trackball blue LED.'''
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self._i2c_rdwr([REG_LED_BLU, value & 0xFF])
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def set_white(self, value):
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'''Set brightness of trackball white LED.'''
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self._i2c_rdwr([REG_LED_WHT, value & 0xFF])
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def _clear_pending_hid(self):
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self.pointing_device.hid_pending = False
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self.pointing_device.report_x[0] = 0
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self.pointing_device.report_y[0] = 0
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self.pointing_device.report_w[0] = 0
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self.pointing_device.button_status[0] = 0
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def _read_raw_state(self):
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'''Read up, down, left, right and switch data from trackball.'''
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left, right, up, down, switch = self._i2c_rdwr([REG_LEFT], 5)
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switch, switch_state = (
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switch & ~MSK_SWITCH_STATE,
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(switch & MSK_SWITCH_STATE) > 0,
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)
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return up, down, left, right, switch, switch_state
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def _i2c_rdwr(self, data, length=0):
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'''Write and optionally read I2C data.'''
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while not self._i2c_bus.try_lock():
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pass
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try:
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if length > 0:
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result = bytearray(length)
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self._i2c_bus.writeto_then_readfrom(
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self._i2c_address, bytes(data), result
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)
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return list(result)
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else:
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self._i2c_bus.writeto(self._i2c_address, bytes(data))
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return []
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finally:
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self._i2c_bus.unlock()
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def _tb_mode_press(self, key, keyboard, *args, **kwargs):
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self.mode = not self.mode
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def _calculate_movement(self, raw_x, raw_y):
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'''Calculate accelerated movement vector from raw data'''
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if raw_x == 0 and raw_y == 0:
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return 0, 0
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var_accel = 1
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power = 2.5
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angle_rad = math.atan2(raw_y, raw_x) + self.angle_offset
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vector_length = math.sqrt(pow(raw_x, 2) + pow(raw_y, 2))
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vector_length = pow(vector_length * var_accel, power)
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x = math.floor(vector_length * math.cos(angle_rad))
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y = math.floor(vector_length * math.sin(angle_rad))
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limit = 127 # hid size limit
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x_clamped = max(min(limit, x), -limit)
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y_clamped = max(min(limit, y), -limit)
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return x_clamped, y_clamped
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