Hi

I'm picking up some legacy code for a PCB controlled by an '18F4550 and have
got a problem that is confusing me. I'm not v experienced with 18F devices
or C-18, so it may be a silly mistake.

The EUSART transmits via a MAX3080E chip (RS485 transceiver), then down a
short length of cable to an RS485 to USB converter (a USB-COMi-M) and into a
mac running ZTerm. The below code snippet functions fine:
[code]
while(1) {
     putch('x');
}
[/code]
in that it writes a continuous stream of 'x's to ZTerm. If I try to send
individuals bytes, or a short stream, like this:
[code]
     putch('x');
     putch('x');
     putch('x');
[/code]
then I don't get any output on ZTerm. No other settings are changed between
the two experiments. Any ideas why this might be?

RCSTA is set to: b'10010100'
TXSTA is set to: b'10100110'
BAUDCON is: b'01000000'
Baud rate is 19.2k.

The EUSART is running from the internal oscillator, which I know isn't
perfect, but it's an inherited PCB and I can't do much about it.

Many thanks for any pointers.

Btw. I also tried to post this message on the Microchip forums, but it
looked like it got bounced back repeatedly - but in case it later pops up
there, apologies for any double posting.

Jamie


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