Hyperterminal/RS232/printing strings

[EdWaugh]

Hi all,

I've still been having some problems printing my strings with printf but I think I may have figured it out. I started thinking when I found that my code would simulate ok but not work properly on the real device. I tried using RealTerm instead of HyperTerminal and magically all my data would appear. Looking at the Hex output it seems like the PIC is doing exactly what I would expect so I figured it must be something to do with the way hyperterminal interprets the data although fiddling with its settings I couldn't get it to cooperate.

Eventually:

I think it may be to do with my choice of RS232 format, I usually do 115200, 8 bits, 1 stop, even parity and this seems to work fine except for this bizarre behaviour when printing a string. By switching to 7bits same other settings it works fine.

Am asking more of the RS232D spec. than I am allowed? Surely 8bit with parity must exist...? 7 bit is fine for ascii but in binary mode i guess its no good! RealTerm seems to have no problems but is a bit unfinished and I often wonder if its really doing what it says. Can anyone recomend a really good terminal/serial comms program?

I'm using compiler version 3.172 and Hyperterminal XP SP2.

cheers

ed

[drh]

Have you tried SIOW. It's one of the utility programs included with the compiler.
_________________
David

[EdWaugh]

cheers david,

thats a good suggestion I'd forgotton about that. I would quite like to get it sorted with Hyperterminal as its handy to have a standard interface for people when your giving them hardware. Hyperterminal is also handy as you can use the terminal codes to do deletes, go back lines etc...

As long as I can use that with 7E1 tho thats the main thing, I was just curious if anyone else had seen this behaviour and if I'm doing something fundamentally wrong. I'm wondering if you can only add parity to 7 bits when you have one stop bit as RS232 might only support 10bits total, ie: 1 start, 7data, 1 parity, 1 stop, or 1 start, 8 data, 1 stop.

I tried to find the proper spec document but couldn't get it at a first look. Maybe I'll try again and see if I can solve the mystery. Although I think it is more likely that its the very terminal commands I find handy that are causing the problem asi it only seems to affect hyperterminal.

ed

[salva]

Hello,

I'm a student in electronics and I've got a problem because I need comunicate a PIC16F877 whith computer (hyperterminal) using RS232.

I must to send words of 16 bits. I've been watching the reference's manual CCS but I don't understand when starts the comunication, when finishes and how I indicate the data to transmit.

If you could help me sending code or any example...

Thanks