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SeeCwriter
Joined: 18 Nov 2013
Posts: 160
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| strcpy() |
 Posted: Mon Sep 21, 2015 2:37 pm |
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I am using CCS compiler v5.049 with an 18F8722 cpu.
I've used strcpy() alot over the years and have never seen a problem like this.
| Code: |
char tmp[9];
byte tmp2[9];
strcpy( tmp, "INITDONE" );
strcpy( (char*)tmp2, "INITDONE" );
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After the first strcpy() runs, array tmp will have some number of non-ascii
characters in it. The number of non-ascii characters changes based on where in
the program that code is located. But the non-ascii chars are always 0xFE. I know
you might think that the array is being stomped on, but that is not the case.
I break the program at strcpy() and step over it, then examine the contents
with the debugger.
After the second strcpy() runs, the value of tmp2 is always correct.
Steve |
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SeeCwriter
Joined: 18 Nov 2013
Posts: 160
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| Posted: Mon Sep 21, 2015 3:30 pm |
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| Correction: the processor used is the 12LF1552, NOT the 18F8722. |
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SeeCwriter
Joined: 18 Nov 2013
Posts: 160
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| Posted: Mon Sep 21, 2015 4:34 pm |
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| Correction #2: the pic really is the 18F8722. Can't run the debugger on a 12LF1552. Juggling too many projects. Oiy vey! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Sep 21, 2015 6:09 pm |
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Now that we're back to something that I can test in MPLAB vs. 8.92 simulator...
I made this test program and ran it in the simulator and it seems to work
just fine. Here are the results in the Output Window:
| Quote: |
tmp = INITDONE
tmp2 = INITDONE
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| Code: | #include <18F8722.h>
#fuses INTRC_IO, NOWDT
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)
//===========================
void main()
{
char tmp[9];
byte tmp2[9];
strcpy( tmp, "INITDONE" );
strcpy( (char*)tmp2, "INITDONE" );
printf("tmp = %s \r", tmp);
printf("tmp2 = %s \r", tmp);
while(TRUE);
} |
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SeeCwriter
Joined: 18 Nov 2013
Posts: 160
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| Posted: Tue Sep 22, 2015 8:27 am |
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I don't know what to say. Not only doesn't strcpy() work, but memcpy() doesn't work either. And when I said that declaring 'tmp' as a byte array worked, I was wrong. It only worked once.
I am reduced to do the following:
| Code: |
char tmp[9];
tmp[0]='I';tmp[1]='N';tmp[2]='I';tmp[3]='T';tmp[4]='D';tmp[5]='O';tmp[6]='N';tmp[7]='E';tmp[8]=NUL;
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Crude, but it works. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Sep 22, 2015 3:03 pm |
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You shouldn't have to do that. Either you have a damaged compiler
or you're doing something else that is not shown. You shouldn't use
a damaged compiler to continue a project. At a minimum, re-install
the compiler.
What happens if you do my test ? Compile and run my test program
in MPLAB simulator. Does it work ?
I'm trying to think of what else could possibly cause your problem.
Just wondering, but do you have old CCS include files, leftover from
some previous version of the compiler, sitting in your project directory ?
Or, have you been using CCS's "version switching" program to switch
between different versions of the compiler ? You're doing something.
I just don't know what. |
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newguy
Joined: 24 Jun 2004
Posts: 1909
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| Posted: Tue Sep 22, 2015 4:46 pm |
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| I've had to do the same crude thing in a recent project because 4.141 wasn't handling strings. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Sep 22, 2015 5:20 pm |
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There are other ways to initialize strings at compile time. For me, with
vs. 5.049, the following code works in MPLAB vs. 8.92 simulator.
It displays this in the Output Window:
Test program:
| Code: |
#include <18F4620.h>
#fuses INTRC_IO,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)
//============================
void main()
{
char tmp[9] = "INITDONE";
printf("%s", tmp);
while(TRUE);
}
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My question for the O.P. is, does any of this stuff work for you ?
My two examples ? |
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