Recent Posts

• January 26, 2008

  Disable Low-Voltage ICSP

  Low voltage ICSP programming mode is enabled by default on the PIC18F242. In this mode, RB5 can't be used as a general-purpose I/O pin, which caused havoc for my Ifos project. Simply reorienting the breadboard or touching a connector would cause t...

• November 11, 2007

  Function Pointers in PIC Assembler

  Simplified the Modbus slave code by replacing the large case statements—sprinkled throughout—with function pointer tables. Compared to computed jump tables, they may seem heavyweight, but they have four significant advantages: They allow arbitrar...

• September 25, 2006

  Real Code

  Stashed the real code in the repository. I guess it's a real project, since only throw-away tests avoid revision control. Nice to have (secure) remote access, too. That was about to get inconvenient.

• September 25, 2006

  Modbus Kickoff

  Set up the subversion repository and seeded it with some placeholder files, just to get the hang of things. Went to a lot of effort to get permissions and SSL working correctly, since I'm still not sure how I will eventually license the project.