busio I2C import on RPi

[magnus-haw]

Line 21 in busio.py should have an "elif" statement instead of an "if" statement. Currently, if the board is not a beaglebone_black, the code attempts to execute the last else statement. This creates an error for Raspberry pi boards which do not use the Micropython machine module.

Discovered this issue when trying to install CircuitPython from this tutorial: https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

def init(self, scl, sda, frequency):
self.deinit()
if board_id == "raspi_3" or board_id == "raspi_2":
from adafruit_blinka.microcontroller.raspi_23.i2c import I2C as _I2C
if board_id == "beaglebone_black":
from adafruit_blinka.microcontroller.raspi_23.i2c import I2C as _I2C
else:
from machine import I2C as _I2C

->>>
def init(self, scl, sda, frequency):
self.deinit()
if board_id == "raspi_3" or board_id == "raspi_2":
from adafruit_blinka.microcontroller.raspi_23.i2c import I2C as _I2C
elif board_id == "beaglebone_black":
from adafruit_blinka.microcontroller.raspi_23.i2c import I2C as _I2C
else:
from machine import I2C as _I2C

[gjoseph]

Found the same thing @magnus-haw - here's a PR that I hope will get merged soon :)

[asyzen]

@magnus-haw Thanks!

[ladyada]

we're about to fix this with a different PR, hold tight!

[ladyada]

apologies for the break. lots of dev goin' on
please try 0.3.1 - i tested it but it could use more testin' as always :)

[csylvain]

that (0.3.1) broke something (0.3.0 worked after changing that one "if" to "elif")
Traceback (most recent call last):
File "bme280_simpletest.py", line 8, in
i2c = busio.I2C(board.SCL, board.SDA)
File "/home/pi/.local/lib/python3.5/site-packages/busio.py", line 15, in init
self.init(scl, sda, frequency)
File "/home/pi/.local/lib/python3.5/site-packages/busio.py", line 20, in init
from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
ImportError: No module named 'adafruit_blinka.microcontroller.generic_linux'

fix with
~/.local/lib/python3.5/site-packages/adafruit_blinka/microcontroller $ ln -sf raspi_23 generic_linux

[ladyada]

hmm - lemme take another look

[ladyada]

ok i think it's cause i forgot a init.py file - fun times! new release coming soon

[ladyada]

OK please try 0.3.2!

[ladyada]

i think this is resolved now, @brennen tested it. closing - please reopen if it's still an issue

[csylvain]

no pin.py in generic_linux ? only in raspi_23.

[ladyada]

thats correct, we have not done our libgpiod changes so pin control is still board specific

[csylvain]

k!