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EdWaugh
Joined: 07 Dec 2004 Posts: 127 Location: Southampton, UK
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Hyperterminal/RS232/printing strings |
Posted: Mon Mar 21, 2005 5:25 am |
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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 |
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drh
Joined: 12 Jul 2004 Posts: 192 Location: Hemet, California USA
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Posted: Mon Mar 21, 2005 1:48 pm |
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Have you tried SIOW. It's one of the utility programs included with the compiler. _________________ David |
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EdWaugh
Joined: 07 Dec 2004 Posts: 127 Location: Southampton, UK
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Posted: Mon Mar 21, 2005 4:13 pm |
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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 |
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salva Guest
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From PIC16F877 to computer by RS232 |
Posted: Wed Mar 23, 2005 9:15 am |
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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 |
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