RX interrupt

[Charles Linquis]

And I don't know your hardware - but. You can't run the output of a PC serial port directly into a hardware serial port of a PIC, even with a resistor. The PC output is LOW when no character is transmitted, while the PIC expects a HIGH when no character is transmitted. If you use a level-shifter/inverter like a MAX232 between your PIC and PC, you don't need a resistor (pull-up or otherwise), and the inversion will be taken care of for you.

[Archangel]

And I don't know your hardware - but. You can't run the output of a PC serial port directly into a hardware serial port of a PIC, even with a resistor. The PC output is LOW when no character is transmitted, while the PIC expects a HIGH when no character is transmitted. If you use a level-shifter/inverter like a MAX232 between your PIC and PC, you don't need a resistor (pull-up or otherwise), and the inversion will be taken care of for you.

Or you could use a transistor to invert the P/C's inverted logic back to true. I first saw this method employed by P H Anderson in a serial LCD backpack I bought from him. Wulfden sells kits,based on his chips, and the schematic can be found here in his manual: http://www.wulfden.org/downloads/manuals/K107manual.pdf
If you go there be sure to visit his products page. He even sells the bare PCB if you don't want the kits.
http://www.wulfden.org/TheShoppe/products.shtml

[Arciure]

Serial data is transmitted wireless from my computer to the pic, using Xbee modules. The transmission is working fine, atleast the characters from the pic get correctly received. The PIC is interrupting, do some action, and resume back normally, when receiving something on UART. However i dont know yet if the incomming serial data is correct.

I put this code in the interrupt section

HSERIN [WAIT("*"),STR serdata\4]
hserout ["=",str serdata\4]

But it doesnt return anything. For example, i send the following sequence:
"*1234" it should return 1234. But it doesnt.