Trouble getc() ing characters with serial

[PCM programmer]

Try a simple program below, that echoes back the characters that
you type in to the terminal window. It should work.

[lsteele]

Ok, that worked! Thanks.

I'm now going to go step by step adding to your program until I locate the difference that's preventing my version from working.

[canuck]

I have also been having problems using getc() with Hyperterminal. When I press a key it seems to bog down, but nothing is echoed back to the screen. Other print statements work fine.

When I use "B&B COM Test" v1.0 everything works fine.


code:

#include <16F877.h>
#fuses XT,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//============================
void main()
{
char c;

while(1)
{
c = getc();
putc(c);
}

}

[ckielstra]

I've had many communication problems related to Hyperterminal. Please save yourself a lot of time and get a decent terminal emulator program.

For example use Siow.exe, provided with your CCS compiler.

[meereck]

[PCM programmer]

There are improved versions of HyperTerminal.
http://www.hilgraeve.com/htpe/index.html
Readme file:
Scroll down to the versions list.
http://www.hilgraeve.com/support/readmes/htpe.html
I've used version 5.0. It looks like they now have a later version.

I'm not saying it's better than the other terminal programs. It's
probably not. But if you did want to have HyperTerminal on your
system and use it occasionally, it's probably better to use this improved
"Private Edition" version.

[canuck]

Thanks for your suggestions everyone.

[Guest]

I'm using a PIC18F4550, and neither gets() or getc() work at all. They continue to just hang.

I've tried everything mentioned here.

I have the proper line driver, etc. For some reason, sometimes it works while other times it won't work. Output is no problem, it's just the input.

Even something as simple as this doesn't work:

#include <18F4550.h>
#device adc=8

#FUSES HS,NOLVP,NOWDT,PUT
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)

void main(void)
{
char key;

printf("This works.\n\r");

key=getc();
putc(key);

printf("We've finally allowed you to get here.\n\r");
}

[PCM programmer]

If putc() works and getc() doesn't work, check the wiring.

Is this a board that you built yourself, or is it a manufactured demo board ?

[michellelicious]

[PCM programmer]

I don't have 4.013, but I do have 4.014. I tested it just now with that
verison, with a 16F877 and a PicDem2-Plus board. It works. It probably
also works with 4.013, because this type of simple program is likely what
CCS used to do some sort of pass-fail test on the version.

If you built your own board, then buy a pre-made board from some company. If you're using Proteus, then buy a real hardware board.
If you built your own serial cable, then buy a cable.