examples/mcps_busio_i2c.py

   1 # SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
   2 #
   3 # SPDX-License-Identifier: MIT
   4 import time
   5 import hid
   6 import busio
   7
   8 from adafruit_blinka.microcontroller.mcp2221.mcp2221 import mcp2221 as _mcp2221
   9 from adafruit_blinka.microcontroller.mcp2221.mcp2221 import MCP2221 as _MCP2221
  10 from adafruit_blinka.microcontroller.mcp2221.i2c import I2C as _MCP2221I2C
  11
  12 MLXADDR = 0x33
  13 ADDRID1 = 0x2407
  14
  15
  16 class MCP2221(_MCP2221):  # pylint: disable=too-few-public-methods
  17     def __init__(self, address):
  18         self._hid = hid.device()
  19         self._hid.open_path(address)
  20         print("Connected to " + str(address))
  21         self._gp_config = [0x07] * 4  # "don't care" initial value
  22         for pin in range(4):
  23             self.gp_set_mode(pin, self.GP_GPIO)  # set to GPIO mode
  24             self.gpio_set_direction(pin, 1)  # set to INPUT
  25
  26
  27 class MCP2221I2C(_MCP2221I2C):  # pylint: disable=too-few-public-methods
  28     def __init__(self, mcp2221, *, frequency=100000):
  29         self._mcp2221 = mcp2221
  30         self._mcp2221.i2c_configure(frequency)
  31
  32
  33 class I2C(busio.I2C):  # pylint: disable=too-few-public-methods
  34     def __init__(self, mcp2221_i2c):
  35         self._i2c = mcp2221_i2c
  36
  37
  38 addresses = [mcp["path"] for mcp in hid.enumerate(0x04D8, 0x00DD)]
  39
  40 i2c_devices = []
  41 i2c_devices.append(I2C(MCP2221I2C(_mcp2221)))
  42
  43 for addr in addresses:
  44     try:
  45         i2c_device = I2C(MCP2221I2C(MCP2221(addr)))
  46         i2c_devices.append(i2c_device)
  47     except OSError:
  48         print("Device path: " + str(addr) + " is used")
  49
  50
  51 while True:
  52     for i2c in i2c_devices:
  53         addrbuf = bytearray(2)
  54         addrbuf[0] = ADDRID1 >> 8
  55         addrbuf[1] = ADDRID1 & 0xFF
  56         inbuf = bytearray(6)
  57         i2c.writeto_then_readfrom(MLXADDR, addrbuf, inbuf)
  58         print("Device " + str(i2c_devices.index(i2c)) + ": ")
  59         print(inbuf)
  60         time.sleep(0.5)