使用 Python 模块 SMBus、Raspberry Pi 的输入/输出错误

Question

I have connected a Raspberry Pi and a separate board together with a homemade I²C level shifter, and installed the Python module SMBus, the Raspberry Pi can communicate with the the PiGlow on the other board, but every so often I get an input/output error message when trying the command:

bus.write_i2c_block_data(address, signal, data)

It says:

IOError: [Errno 5] Input/output error

I found a work around for it through this post: Input/output error using Python module SMBus, a Raspberry Pi and an Arduino (and this is more or less a follow up to that question)

I currently have try-catch's around the calls that gave me the error like so:

try:
    bus.write_i2c_block_data(address, signal, data)
except IOError:
    subprocess.call(['i2cdetect', '-y', '1'])

which works perfectly fine to work around the i/o errors. My problem is, due to all the try-catch's, the code seems to run significantly slower. I was wondering if there was another known work around of if there was a more efficient way to do this. Any help would be appreciated!

Thanks

Answer 1

Do you call Serial.print or similar in the reception interrupt handler of your separate board ? If yes, it may be the problem. On an Arduino , for example, one should avoid calling Serial.xxx functions inside an interruption.

Removing Serial.print lines on Arduino solved the problem for me.

Thanks.