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wtorres
Joined: 21 May 2012
Posts: 1
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| CCS Pointer Issue |
 Posted: Mon May 21, 2012 7:39 pm |
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I'm facing an issue with CCS compiler version 4.065, when I compile the code below:
| Code: |
void main(void)
{
rom char Data[] = {1,2,3};
rom char *ShowData;
Mostra = &Data[0];
printf("%x", (char)*Mostra);
}
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Instead of receiving the value 1 through the serial port, I'm getting always 10. Could you please someone help me on this. I have executed the same code on Code::Blocks and worked fine.
Thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon May 21, 2012 8:58 pm |
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| Always post your PIC. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
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| Posted: Tue May 22, 2012 1:19 am |
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I think 4.065, was before CCS got rom pointers to work. It was one of the features that was 'last' to get going, and my memory was that it didn't work before about 4.07x somewhere.
Sorry, but compiler upgrade only real answer if so.
Best Wishes |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
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| Posted: Tue May 22, 2012 7:40 am |
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As another comment though, you don't show the declaration of 'Mostra'. Also remember that 'Data' on it's own, is the address of the first element of the array.
Just tried:
| Code: |
#include <18F452.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //External 20MHz clock
#FUSES PUT //Power Up Timer
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,UART1,bits=8,ERRORS)
void main(void) {
rom char Data[] = {1,2,3};
rom char* ShowData;
int temp;
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
ShowData = &Data[0];
temp=*Showdata;
printf("%02x\n", temp);
do {
} while (TRUE);
}
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With 4.070 (the oldest V4 compiler I have kept), and it doesn't work.
Then compiled with 4.099, and it does.
I had tweaked a couple of things that might cause problems (I had found in the past that for some printf operators, you do have to extract the element from the array 'first'), but these didn't help on the older compiler.
So, I'm afraid 'compiler age' is the fundamental problem.
Best Wishes |
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