CircuitPython PT2258 control

pt2258.py

import time
import board
from adafruit_bus_device.i2c_device import I2CDevice

i2c = board.I2C()  # uses board.SCL and board.SDA
pt2258 = I2CDevice(i2c, 0x44)

# define  CHANNEL1_VOLUME_STEP_01  0x90
# define  CHANNEL1_VOLUME_STEP_10  0x80
# define  CHANNEL2_VOLUME_STEP_01  0x50
# define  CHANNEL2_VOLUME_STEP_10  0x40
# define  CHANNEL3_VOLUME_STEP_01  0x10
# define  CHANNEL3_VOLUME_STEP_10  0x00
# define  CHANNEL4_VOLUME_STEP_01  0x30
# define  CHANNEL4_VOLUME_STEP_10  0x20
# define  CHANNEL5_VOLUME_STEP_01  0x70
# define  CHANNEL5_VOLUME_STEP_10  0x60
# define  CHANNEL6_VOLUME_STEP_01  0xb0
# define  CHANNEL6_VOLUME_STEP_10  0xa0
# define  MASTER_VOLUME_1STEP      0xe0
# define  MASTER_VOLUME_10STEP     0xd0
# define  MUTE                     0x08
# define  SYSTEM_RESET             0xc0

channelsUnits = (0xE0, 0x90, 0x50, 0x10, 0x30, 0x70, 0xB0)
channelsTens = (0xD0, 0x80, 0x40, 0x00, 0x20, 0x60, 0xA0)

with pt2258:
    pt2258.write(bytes([0xC0]))  # system reset


def setChannelVol(channel, dB):
    baseUnit = channelsUnits[channel]
    baseTens = channelsTens[
        channel
    ]  # need to blend these with the BCD representation of the digit

    dBUnit = baseUnit | (dB % 10)
    dBTens = baseTens | (dB // 10)

    with pt2258:
        pt2258.write(bytes([dBUnit, dBTens]))


setChannelVol(0, 0)
setChannelVol(1, 0)
setChannelVol(2, 0)
setChannelVol(3, 0)
setChannelVol(4, 0)
setChannelVol(5, 0)
setChannelVol(6, 0)

attnVal = 0

while True:
    setChannelVol(1, attnVal)
    setChannelVol(4, 40 - attnVal)
    attnVal += 1
    attnVal %= 40
    print(attnVal)
    time.sleep(0.02)