RS232, ICD, fuses

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

Colleagues,

I'm using ICD-U40 to program the PIC. The problem is that I don't get the RS232 output unless the ICD is attached to the PIC.

Here are my declarations:

Ttelmah · Guest

DisgruntledPostalWorker · Guest

I had a similar problem with the debug environment. If I was debugging, all was well. If I was running in standalone mode, I couldn't get anything in the UART. After 12 hours of experimenting, I found that the #USE RS232 calls create an interrupt each time they're used. In the debug environment, the interrupts aren't seen, so it works. In standalone mode, the #USE interrupt blocked my UART interrupt and I never received anything. The fix: stop using #USE each time I switched ports. Put all your #USE statements at the top of the file ONCE only, and identify them as streams. Then, use fprintf to print to streams, without using the #USE statments in running code. It was the only workaround I could find.

Any others with this problem?

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

The solution was in hardware in my case. RS232 had poor ground connection, so when I was attaching the ICD, it was creating an additional ground connection.

Nick