Can't get 2 sensor chips working
dpnsw at optusnet.com.au
Thu Feb 20 00:51:40 CET 2003
I am trying to get a PCF8591 and a PCF8574 working using the i2c-pport
I have at the moment the i2c-pport and algo-bit modules loaded and am trying
to get access to the PCF chips.
modprobe pcf8574 probe=0,0x20
modprobe pcf8591 probe=0,0x48
don't actually creaate any files under proc and the modules remain unused as
far as lsmod is concerned.
I can get the devices up if I
modprobe pcf8574 force_pcf8574=0,0x20
modprobe pcf8591 force_pcf8591=0,0x48
everything loads, I get the relavent files under
it doesn't look like I am really taking to the chips though.
Changes I make on the inputs aren't reflected in the values under /proc.
If I run the i2cdetect 0 I get UU showing in both 0x20 and 0x48
I have used my scope and know that signals are getting to the chips in
question but it isn't a storage scope so I can't look to see if the pulses
are really valid i2c pulses.
Any hints on what to do next.
More information about the lm-sensors