what was the motivation for this? do you have any interesing i2c Python programs to share with us? Mark M. Hoffman wrote: > Hi: > > (cc James, who IIRC is a Python guy...) > > After a couple false starts and some hair-pulling, here is a Python module > which allows SMBus access through the I2C /dev interface. I would like to > eventually add this to the lm_sensors project. > > http://members.dca.net/mhoffman/sensors/python/ > > To build it and use it in place, start with this: > > $ python setup.py build > > Then, e.g. (as root): > > # python > (...) > >>> from smbus import SMBus > >>> b = SMBus(0) # 0 indicates /dev/i2c-0 > >>> b.read_byte_data(0x2f,0x58) > 114 > > If there's no device to ack the address, or in case of any other bus > error, it raises an exception: > > >>> b.write_quick(0x2e) > Traceback (most recent call last): > File "<stdin>", line 1, in ? > IOError: [Errno 1] Operation not permitted > > TODO: the rest of the bus transactions, and the capabilities query. > > WARNING: I have managed to lock up my machine's SMBus more than once, so > the usual caveats apply. If you lock up your bus (such that write_quick > commands to known good addresses start to fail) you may need to COMPLETELY > power off your machine, including physically removing the plug from the > power supply. In my case, the machine fails the BIOS POST until I do that. > Of course, this is no worse than what is possible from i2c-dev directly. > > Which reminds me... Khali: Is i2c-dev safe (ruin-proof) for people with > IBM laptops? Or would that check need to be built in to this? > > Comments and suggestions are welcome. > > Regards, >
