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DaveMorris
Joined: 13 Oct 2003
Posts: 6
Location: Stourbridge, England
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| PCM compiler / strcpy problem 3.245 and 3.249 |
 Posted: Thu Apr 06, 2006 1:32 pm |
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Is it me or is there a problem with how the compiler implements the strcpy() statement. Using compiler version 3.242 the follow code is ok - 3.245 and 3.249 don't work!
.................... {
.................... // Convert Msg to general format! is done by direct copy
.................... strcpy(&commsMsg.data[1], &rfRxBuffer.msg[3]);
1105: MOVLW 5D
1106: BSF 03.6
1107: MOVWF 38
1108: MOVLW 33
1109: BSF 03.5
110A: BCF 03.6
110B: MOVWF 26
110C: BCF 03.5
110D: BSF 03.6
110E: MOVF 38,W
110F: MOVWF 04
1110: MOVF 00,W
1111: BSF 03.5
1112: BCF 03.6
1113: MOVWF 28
1114: MOVF 26,W
1115: MOVWF 04
1116: MOVF 28,W
1117: MOVWF 00
1118: MOVF 00,F
1119: BTFSC 03.2
111A: GOTO 11E
111B: INCF 26,F
111C: INCF 27,F <---- Is this the problem?
111D: GOTO 10C
.................... ok = 1;
111E: MOVLW 01
111F: MOVWF 22
Tracing the code on the Emulator suggests that the pointers are not correct.
Comments Please |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 06, 2006 1:56 pm |
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You didn't provide a test program or say what PIC you're using,
so I made one for the 16F877. I compiled it with PCM vs. 3.249
and it works OK. It displays the following in the terminal window:
That's the correct output.
| Code: | #include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
struct
{
char data[10];
}commsMsg;
struct
{
char msg[10];
}rfRxBuffer;
//============================
void main()
{
rfRxBuffer.msg[0] = '0';
rfRxBuffer.msg[1] = '1';
rfRxBuffer.msg[2] = '2';
rfRxBuffer.msg[3] = '3';
rfRxBuffer.msg[4] = '4';
rfRxBuffer.msg[5] = '5';
rfRxBuffer.msg[6] = '6';
rfRxBuffer.msg[7] = '7';
rfRxBuffer.msg[8] = '8';
rfRxBuffer.msg[9] = 0;
strcpy(&commsMsg.data[1], &rfRxBuffer.msg[3]);
printf("%s\n\r", &commsMsg.data[1]);
while(1);
} |
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sjbaxter
Joined: 26 Jan 2006
Posts: 141
Location: Cheshire, UK
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| Posted: Thu Apr 06, 2006 2:03 pm |
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If you have more than a single variable in a struct the compiler may be allocating them incorrectly (i.e. overlapping !!) it did in 3.242 and I have seen a post recently that mentioned a later version aswell.
Have a look at your symbolic file (.SYM) and see what addresses commsMsg and rfRxBuffer have been allocated.
PCM, I suspect you don't see it as the struct is the size of the char array.
See my original post:
http://www.ccsinfo.com/forum/viewtopic.php?t=26107&highlight=242
...its shows what I mean. Try 3.236.
_________________
Regards,
Simon. |
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