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Guest
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| problem with pointers - strange bug |
 Posted: Mon Nov 29, 2004 4:15 pm |
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I am using a PIC18F4620 because of the large memory.
Here is my code. I tried to reproduce the bug using a smaller program than my program.
| Code: | #include <18F4620.h>
#device *=16
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,WDT128,LP, NOPROTECT, IESO, BROWNOUT, BORV21, NOPUT, NOCPD, STVREN, NODEBUG, LVP, NOWRT, NOWRTD, NOEBTR, NOCPB, NOEBTRB, NOWRTC, NOWRTB, FCMEN, XINST, PBADEN, LPT1OSC, MCLR |
| Code: | void main()
{
unsigned int array[1000];
typedef union myType
{
unsigned int mybyte;
struct _BITS
{
unsigned int value:7;
unsigned int onebit:1;
}bits;
}Type;
Type * ptr = 0x014A;
(*ptr).mybyte = 11;
} |
I really don't need the big array, but I just use it to be able to track what value is at address 0x14A in MPLAB Sim.
The problem is that the instruction (*ptr).mybyte = 11; doesnt change the value at address 0x014A, but changes the value at address 0x004A.
When I set ptr to a smaller value like 0xBE for example, everything works fine. Why doesn't this work with 0x014A.
What can I do to change the value at address 0x014A??? |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Mon Nov 29, 2004 6:16 pm |
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Guest
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| Posted: Mon Nov 29, 2004 7:49 pm |
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Thanks.
BTW CCS should make sure that this kind of details work.
I mean, what's the difference betwen ptr->mybyte and (*ptr).mybyte ??? |
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