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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Trivial string problem |
 Posted: Wed Jun 04, 2008 9:24 am |
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In years of working with PICs and CCS I have never had to use strings until now. This code is almost verbatim from my beginning C primer. It prints "Hello Small_Strings" and "This is a quoted string" but it prints nothing for globalstring.
What am I doing wrong? Is it some peculiarity of PICs or CCS? I suspect I am not declaring the string correctly.
I am using PCW 3.242 with a PIC18F2585.
| Code: | char globalstring[] = "This is a global string.";
void main() {
output_high(PWR_485);
fprintf(Gliderbus,"Hello Small_Strings\n\r");
while(1){
delay_ms(100);
fprintf(Gliderbus,"This is a Quoted String\n\r");
fprintf(Gliderbus,"%s", globalstring);
}
}
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Output: | Code: | Hello Small_Strings
This is a Quoted String
This is a Quoted String
This is a Quoted String
This is a Quoted String
This is a Quoted S....... |
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jun 04, 2008 10:11 am |
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I installed vs. 3.242 and ran the following program in MPLAB Simulator.
It works. It displays this in the Output window:
| Quote: |
Hello Small_Strings
This is a Quoted String
This is a global string.
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| Code: |
#include <18F2585.h>
#fuses INTRC_IO, NOWDT, PUT, BROWNOUT, NOLVP, NOPBADEN
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS, stream=Gliderbus)
char globalstring[] = "This is a global string.";
//==========================
void main()
{
fprintf(Gliderbus,"Hello Small_Strings\n\r");
delay_ms(100);
fprintf(Gliderbus,"This is a Quoted String\n\r");
fprintf(Gliderbus,"%s", globalstring);
while(1);
} |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Stranger & stranger... |
| Posted: Wed Jun 04, 2008 12:23 pm |
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Thanks PCM, but here is my output and the exact code I am now running, mostly your code with minimum changes for my hardware:
| Quote: | Hello Small_Strings
This is a Quoted String
This is a Quoted String
This is a Quoted String
This is a Quoted String
This is a Quoted String
Thi |
| Code: | #include <18F2585.h>
#fuses HS, NOWDT, PUT, BROWNOUT, NOLVP, NOPBADEN
#use delay(clock=8000000)
#define PWR_485 PIN_C3
#use rs232(baud=1200, xmit=PIN_C6, rcv=PIN_C7, ERRORS, stream=Gliderbus, enable=PIN_B3)
char globalstring[] = "This is a global string.";
//==========================
void main()
{
output_high(PWR_485);
fprintf(Gliderbus,"Hello Small_Strings\n\r");
while(1){
fprintf(Gliderbus,"This is a Quoted String\n\r");
fprintf(Gliderbus,"%s", globalstring);
delay_ms(100);
}
} |
I even ran it real slow (600 baud) to see if the global string was being overwritten. How can "Quoted String" print, but "global string" not print?
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jun 04, 2008 12:57 pm |
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There's a problem with using the Enable pin with printf or fprintf in your
version of the compiler. This problem is fixed in later versions.
This thread discusses some work-arounds:
http://www.ccsinfo.com/forum/viewtopic.php?t=28433 |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Wed Jun 04, 2008 1:19 pm |
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Wow, thanks! It would have taken me forever to find that. The work around is simple, almost elegant.
It is so good to find it's not pilot error 
_________________
The search for better is endless. Instead simply find very good and get the job done. |
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