Compiler puts code out of sequence

[topfuel]

I am new to C for PIC's, I have experience with assembly though. I have done a few products with PICs using MPLAB in assembly.

This is the first time I have used CCS C with MPLAB.

I am rewriting assembly code into C for preexisting hardware.

Pretty simple stuff, just a keypad and LCD and a few D I/O lines.

I got the LCD working in C but when I added additional code for the keypad, weird things happened. If I single step through the code all the sudden it branches off into the middle of some other unrelated code.

If I compile and look at the dissasembly view in MPLAB, I can see that the code is fragmented. Here is an exceprt from the dissasembly view that shows where it is acting up. At line 226 there is a gap until line 22A. Line 226 does not have a goto so the program just goes to 227 which is wrong.

Can anyone explain this?

Chris

77: Main()
78: {
00021A 184 CLRF 0x4
00021B 301F MOVLW 0x1f
00021C 583 ANDWF 0x3, F
00021D 1683 BSF 0x3, 0x5
00021E 141F BSF 0x1f, 0
00021F 149F BSF 0x1f, 0x1
000220 151F BSF 0x1f, 0x2
000221 119F BCF 0x1f, 0x3
000222 3007 MOVLW 0x7
000223 09C MOVWF 0x1c
000224 81C MOVF 0x1c, W
000225 1283 BCF 0x3, 0x5
000226 130D BCF 0xd, 0x6
79: //Setup ports and periphials enable interrupt from timer 0
80:
81: SETUP_TIMER_0 (RTCC_DIV_16|RTCC_INTERNAL);
00022A 1683 BSF 0x3, 0x5
00022B 801 MOVF 0x1, W
00022C 39C0 ANDLW 0xc0
00022D 3803 IORLW 0x3
00022E 081 MOVWF 0x1

[PCM programmer]

This is CCS's answer, from their FAQ:
http://www.ccsinfo.com/faq/?9

Main CCS FAQ page:
http://www.ccsinfo.com/faq/

Also to see all the CCS library code, edit the .H file for your PIC
and comment out the #nolist statement at the top of the file.
Then you will see math routines, etc., in the .LST file.

[topfuel]

Thanx for the Faq link.

However I don't think that explains what I am seeing.

The code excerpt that I included shows address 226 as the last sequential line number. What I did not show is that 227 is in the middle of another function. So it goes from main into the middle of a functionl.

How can that be correct?

Chris

[Thiago Esteves]

Hi Chris,

Post your full code, version compiler, etc and this way
We could help you. But, I think that the next line isn't the
next instruction of your C code, now, the compiler mount
the code of the "best way" that it can.

The Line 227 is in some place of your program with another
instruction, Probability, the C code use this way to call the Lines
Like a "Call" in Assembler, But it call the line without a "Call"
in assembler.

If you still have doubts, post your code and we could help you

Best regards

PS: Sorry By my english

Thiago Cesar
Campinas - S�o Paulo - Brasil
www.scienex.com.br
[email protected]