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Yes a logic analyzer would be great, I found John Andrews code on the
PICList Project page where he uses a 17C756, maybe I can convert it to
the 16F877 and use it as a Serial Ascii to I2C interface.
  I also found a parallelport-I2C interface from Ingo Gerlach at
http://home.welfen-netz.de/IngoGerlach/i2c_par/i2c_par.htm it is made
out of three simple chips and also gives an 8 channel logic analyzer on
the screen. It seems to be very useful, but unfortunately the page is
not in English.
 /Lennart



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Herbert Graf
Sent: den 22 januari 2003 04:03
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: I2C debugging

Personally I found a logic analyzer was all I needed to debug my I2C
problems. TTYL

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jon M (Mike) Jones
Sent: January 21, 2003 18:05
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: I2C debugging


I faced the same problem a year or two ago. My solution was to connect
the
16F877 to a 'know' good slave such as a DS1307 clock chip and started
debugging from there.

Mike Jones
pmjones3@attbi.com
----- Original Message -----
From: "Lennart Sundberg" <lennartsundberg@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 21, 2003 1:24 PM
Subject: [PIC]: I2C debugging


Hi
I have implemented an I2C routine in a 16F877 for communication to
another board with a PIC. But how do I know if my I2C routine is working
correct before I build up the other board. How can I do this?
  I have looked around on the web and found a lot of I2C test equipment
but I don't want to pay a lot of money for some extra hw, that may be of
little use for me in the future.
 Could you recommend a low cost debugger or how to test the I2C.

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