kmk_firmware/kmk/modules/pimoroni_trackball.py

315 lines
8.7 KiB
Python

'''
Extension handles usage of Trackball Breakout by Pimoroni
Product page: https://shop.pimoroni.com/products/trackball-breakout
'''
from micropython import const
import math
import struct
from kmk.keys import AX, KC, make_argumented_key, make_key
from kmk.kmktime import PeriodicTimer
from kmk.modules import Module
I2C_ADDRESS = 0x0A
I2C_ADDRESS_ALTERNATIVE = 0x0B
CHIP_ID = 0xBA11
VERSION = 1
REG_LED_RED = 0x00
REG_LED_GRN = 0x01
REG_LED_BLU = 0x02
REG_LED_WHT = 0x03
REG_LEFT = 0x04
REG_RIGHT = 0x05
REG_UP = 0x06
REG_DOWN = 0x07
REG_SWITCH = 0x08
MSK_SWITCH_STATE = 0b10000000
REG_USER_FLASH = 0xD0
REG_FLASH_PAGE = 0xF0
REG_INT = 0xF9
MSK_INT_TRIGGERED = 0b00000001
MSK_INT_OUT_EN = 0b00000010
REG_CHIP_ID_L = 0xFA
RED_CHIP_ID_H = 0xFB
REG_VERSION = 0xFC
REG_I2C_ADDR = 0xFD
REG_CTRL = 0xFE
MSK_CTRL_SLEEP = 0b00000001
MSK_CTRL_RESET = 0b00000010
MSK_CTRL_FREAD = 0b00000100
MSK_CTRL_FWRITE = 0b00001000
ANGLE_OFFSET = 0
class TrackballHandlerKeyMeta:
def __init__(self, handler=0):
self.handler = handler
def layer_key_validator(handler):
return TrackballHandlerKeyMeta(handler=handler)
class TrackballMode:
'''Behaviour mode of trackball: mouse movement or vertical scroll'''
MOUSE_MODE = const(0)
SCROLL_MODE = const(1)
class ScrollDirection:
'''Behaviour mode of scrolling: natural or reverse scrolling'''
NATURAL = const(0)
REVERSE = const(1)
class TrackballHandler:
def handle(self, keyboard, trackball, x, y, switch, state):
raise NotImplementedError
class PointingHandler(TrackballHandler):
def handle(self, keyboard, trackball, x, y, switch, state):
if x:
AX.X.move(keyboard, x)
if y:
AX.Y.move(keyboard, y)
if switch == 1: # Button pressed
keyboard.pre_process_key(KC.MB_LMB, is_pressed=True)
if not state and trackball.previous_state is True: # Button released
keyboard.pre_process_key(KC.MB_LMB, is_pressed=False)
trackball.previous_state = state
class ScrollHandler(TrackballHandler):
def __init__(self, scroll_direction=ScrollDirection.NATURAL):
self.scroll_direction = scroll_direction
def handle(self, keyboard, trackball, x, y, switch, state):
if self.scroll_direction == ScrollDirection.REVERSE:
y = -y
if y != 0:
AX.W.move(keyboard, y)
if switch == 1: # Button pressed
keyboard.pre_process_key(KC.MB_LMB, is_pressed=True)
if not state and trackball.previous_state is True: # Button released
keyboard.pre_process_key(KC.MB_LMB, is_pressed=False)
trackball.previous_state = state
class KeyHandler(TrackballHandler):
x = 0
y = 0
def __init__(self, up, right, down, left, press, axis_snap=0.25, steps=8):
self.up = up
self.right = right
self.down = down
self.left = left
self.press = press
self.axis_snap = axis_snap
self.steps = steps
def handle(self, keyboard, trackball, x, y, switch, state):
if y and abs(x / y) < self.axis_snap:
x = 0
if x and abs(y / x) < self.axis_snap:
y = 0
self.x += x
self.y += y
x_taps = self.x // self.steps
y_taps = self.y // self.steps
self.x %= self.steps
self.y %= self.steps
for i in range(x_taps, 0, 1):
keyboard.tap_key(self.left)
for i in range(x_taps, 0, -1):
keyboard.tap_key(self.right)
for i in range(y_taps, 0, 1):
keyboard.tap_key(self.up)
for i in range(y_taps, 0, -1):
keyboard.tap_key(self.down)
if switch and state:
keyboard.tap_key(self.press)
class Trackball(Module):
'''Module handles usage of Trackball Breakout by Pimoroni'''
def __init__(
self,
i2c,
mode=TrackballMode.MOUSE_MODE,
address=I2C_ADDRESS,
angle_offset=ANGLE_OFFSET,
handlers=None,
):
self.angle_offset = angle_offset
if not handlers:
handlers = [PointingHandler(), ScrollHandler()]
if mode == TrackballMode.SCROLL_MODE:
handlers.reverse()
self._i2c_address = address
self._i2c_bus = i2c
self.mode = mode
self.previous_state = False # click state
self.handlers = handlers
self.current_handler = self.handlers[0]
self.polling_interval = 20
chip_id = struct.unpack('<H', bytearray(self._i2c_rdwr([REG_CHIP_ID_L], 2)))[0]
if chip_id != CHIP_ID:
raise RuntimeError(
f'Invalid chip ID: 0x{chip_id:04X}, expected 0x{CHIP_ID:04X}'
)
make_key(
names=('TB_MODE', 'TB_NEXT_HANDLER', 'TB_N'),
on_press=self._tb_handler_next_press,
)
make_argumented_key(
validator=layer_key_validator,
names=('TB_HANDLER', 'TB_H'),
on_press=self._tb_handler_press,
)
def during_bootup(self, keyboard):
self._timer = PeriodicTimer(self.polling_interval)
def before_matrix_scan(self, keyboard):
'''
Return value will be injected as an extra matrix update
'''
if not self._timer.tick():
return
up, down, left, right, switch, state = self._read_raw_state()
x, y = self._calculate_movement(right - left, down - up)
self.current_handler.handle(keyboard, self, x, y, switch, state)
return
def after_matrix_scan(self, keyboard):
return
def before_hid_send(self, keyboard):
return
def after_hid_send(self, keyboard):
return
def on_powersave_enable(self, keyboard):
return
def on_powersave_disable(self, keyboard):
return
def set_rgbw(self, r, g, b, w):
'''Set all LED brightness as RGBW.'''
self._i2c_rdwr([REG_LED_RED, r, g, b, w])
def set_red(self, value):
'''Set brightness of trackball red LED.'''
self._i2c_rdwr([REG_LED_RED, value & 0xFF])
def set_green(self, value):
'''Set brightness of trackball green LED.'''
self._i2c_rdwr([REG_LED_GRN, value & 0xFF])
def set_blue(self, value):
'''Set brightness of trackball blue LED.'''
self._i2c_rdwr([REG_LED_BLU, value & 0xFF])
def set_white(self, value):
'''Set brightness of trackball white LED.'''
self._i2c_rdwr([REG_LED_WHT, value & 0xFF])
def activate_handler(self, handler):
if isinstance(handler, TrackballHandler):
self.current_handler = handler
else:
try:
self.current_handler = self.handlers[handler]
except KeyError:
print(f'no handler found with id {handler}')
def next_handler(self):
next_index = self.handlers.index(self.current_handler) + 1
if next_index >= len(self.handlers):
next_index = 0
self.activate_handler(next_index)
def _read_raw_state(self):
'''Read up, down, left, right and switch data from trackball.'''
left, right, up, down, switch = self._i2c_rdwr([REG_LEFT], 5)
switch, switch_state = (
switch & ~MSK_SWITCH_STATE,
(switch & MSK_SWITCH_STATE) > 0,
)
return up, down, left, right, switch, switch_state
def _i2c_rdwr(self, data, length=0):
'''Write and optionally read I2C data.'''
while not self._i2c_bus.try_lock():
pass
try:
if length > 0:
result = bytearray(length)
self._i2c_bus.writeto_then_readfrom(
self._i2c_address, bytes(data), result
)
return list(result)
else:
self._i2c_bus.writeto(self._i2c_address, bytes(data))
return []
finally:
self._i2c_bus.unlock()
def _tb_handler_press(self, key, keyboard, *args, **kwargs):
self.activate_handler(key.meta.handler)
def _tb_handler_next_press(self, key, keyboard, *args, **kwargs):
self.next_handler()
def _calculate_movement(self, raw_x, raw_y):
'''Calculate accelerated movement vector from raw data'''
if raw_x == 0 and raw_y == 0:
return 0, 0
var_accel = 1
power = 2.5
angle_rad = math.atan2(raw_y, raw_x) + self.angle_offset
vector_length = math.sqrt(pow(raw_x, 2) + pow(raw_y, 2))
vector_length = pow(vector_length * var_accel, power)
x = math.floor(vector_length * math.cos(angle_rad))
y = math.floor(vector_length * math.sin(angle_rad))
limit = 127 # hid size limit
x_clamped = max(min(limit, x), -limit)
y_clamped = max(min(limit, y), -limit)
return x_clamped, y_clamped