I don't know if I can do that without a storage CRO. I tried altering my triggering but can't seem to hold the signal still long enough to actually see it. Don't know if I can sample using my soundcard. I might be able to record (dpending on whether the pport bus runs at less than 20Khz in speed. I then need to find an audio application that will display the waveform in scope mode. Am I missing something or is this my next step? On Thursday 20 February 2003 12:14, Mark D. Studebaker wrote: > you can try i2cdump 0 0 0x20 > then look on the scope. > If the chip is not responding you will see only the chip address and the > register address > (2 bytes for each access) > If the chip is responding you will see the 3rd byte on the bus (the chip > response) > > David wrote: > > Hi, > > > > I am trying to get a PCF8591 and a PCF8574 working using the i2c-pport > > adaptor. > > > > 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 > > modprobe pcf8591 > > AND > > 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 > > /proc/sys/dev/sensors > > > > 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. > > > > -- > > Best Regards, > > > > David Price -- Best Regards, David Price
