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Charlie U
Joined: 09 Sep 2003
Posts: 183
Location: Somewhere under water in the Great Lakes
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| Maximum length of a string |
 Posted: Fri May 13, 2005 4:42 pm |
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PCWH version 3.212, PIC18F452
I am trying to create a fairly long string, then send it via RS 232 with a polled transmit routine. It appears that the output string from the sprintf() function is limited to 50 characters, even though my ram array for the string is much larger. I keep receiving a "String too long" error. Is this truly a limit of the compiler? I have looked around the CCS site and in the manual, but I can't find any specs on this type of limit. Anybody know where this info can be found?
Thanks in advance. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri May 13, 2005 5:00 pm |
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With PCM vs. 3.224, I can use a string of up to 73 characters without
getting a "string too long" error. The following program compiled and
ran OK.
| Code: | #include <16F877.H>
#device *=16
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
char array[90];
void main()
{
sprintf(array, "abcdefghijklmnopqrstuvwxzyABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789HelloWorld!");
printf("%s", array);
while(1);
} |
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Charlie U
Joined: 09 Sep 2003
Posts: 183
Location: Somewhere under water in the Great Lakes
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| Posted: Fri May 13, 2005 7:59 pm |
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Ok, let's try again. Sorry for the edits, but I had an intermediate compile the worked when I thought that it hadn't, so I deleted the previous version of this post.
This does not work:
| Code: | #include <18F452.h>
#use delay(clock=10000000)
#fuses NOWDT,WDT128,HS, NOPROTECT, NOOSCSEN, NOBROWNOUT, BORV20, NOPUT, \
NOSTVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, \
NOEBTR, NOEBTRB
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
char string_buffer[100];
long int data[16];
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
sprintf(string_buffer, "%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,\
%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu",\
data[0], data[1], data[2], data[3], data[4],data[5], data[6], \
data[7], data[8], data[9], data[10], data[11], data[12], \
data[13], data[14], data[15]);
while (1)
{
;
}
}
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It should only be 64 bytes long shouldn't it?
If I delete some of the data to reduce the string to less than 50 bytes, then it works:
| Code: |
#include <18F452.h>
#use delay(clock=10000000)
#fuses NOWDT,WDT128,HS, NOPROTECT, NOOSCSEN, NOBROWNOUT, BORV20, NOPUT, \
NOSTVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, \
NOEBTR, NOEBTRB
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
char string_buffer[100];
long int data[16];
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
sprintf(string_buffer, "%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,%3lu,\
%3lu,%3lu,%3lu,%3lu",\
data[0], data[1], data[2], data[3], data[4],data[5], data[6], \
data[7], data[8], data[9], data[10], data[11]);
while (1)
{
;
}
}
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But this version does work:
| Code: |
#include <18F452.h>
#use delay(clock=10000000)
#fuses NOWDT,WDT128,HS, NOPROTECT, NOOSCSEN, NOBROWNOUT, BORV20, NOPUT, \
NOSTVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, \
NOEBTR, NOEBTRB
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
char string_buffer[100];
long int data[16];
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
sprintf(string_buffer, "%lu,%lu,%lu,%lu,%lu,%lu,%lu,%lu,\
%lu,%lu,%lu,%lu",\
data[0], data[1], data[2], data[3], data[4],data[5], data[6], \
data[7], data[8], data[9], data[10], data[11]);
while (1)
{
;
}
}
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But this one doesn't:
| Code: |
#include <18F452.h>
#use delay(clock=10000000)
#fuses NOWDT,WDT128,HS, NOPROTECT, NOOSCSEN, NOBROWNOUT, BORV20, NOPUT, \
NOSTVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, \
NOEBTR, NOEBTRB
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
char string_buffer[100];
long int data[16];
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
sprintf(string_buffer, "%lu,%lu,%lu,%lu,%lu,%lu,%lu,%lu,\
%lu,%lu,%lu,%lu,%lu,%lu,%lu,%lu",\
data[0], data[1], data[2], data[3], data[4],data[5], data[6], \
data[7], data[8], data[9], data[10], data[11], data[12], data[13], \
data[14], data[15]);
while (1)
{
;
}
}
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AaaaaaaaaaaahhhhhhhhhHH?!?!?!?!?!?!?!?!?!? |
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