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CCS generated assembler

 
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Bomba



Joined: 09 Dec 2003
Posts: 13

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CCS generated assembler
PostPosted: Fri Jan 23, 2004 9:16 am     Reply with quote
See the second code, and tell my why pass at line 0009 without line 0008, compare it with the 1º. And other question is, second code in line 12: SET_TRIS_B( 0x0 ); do nothing (only line 0007)...

******* 1º
5: #use fast_io(B)
6:
7: void main()
8: {
000004 184 CLRF 0x4
000005 301F MOVLW 0x1f
000006 583 ANDWF 0x3, F
9: int Aux1,Aux2;
10: short Aux3;
11:
12: //SET_TRIS_B( 0x0 );
13:
14: //OUTPUT_A(0x00);
15: Aux3=1;
000007 1411 BSF 0x11, 0
16: Aux1 = input_b();
000008 806 MOVF 0x6, W
000009 08F MOVWF 0xf
****** end 1º

******2º
5: #use fast_io(B)
6:
7: void main()
8: {
000004 184 CLRF 0x4
000005 301F MOVLW 0x1f
000006 583 ANDWF 0x3, F
9: int Aux1,Aux2;
10: short Aux3;
11:
12: SET_TRIS_B( 0x0 );
000007 3000 MOVLW 0
13:
14: //OUTPUT_A(0x00);
15: Aux3=1;
000009 1411 BSF 0x11, 0
16: Aux1 = input_b();
00000A 806 MOVF 0x6, W
00000B 08F MOVWF 0xf
*****end 2º

See that:

*********3º
.................... #use fast_io(B)
....................
.................... void main()
.................... {
0004: CLRF 04
0005: MOVLW 1F
0006: ANDWF 03,F
.................... int Aux1,Aux2;
.................... short Aux3;
....................
.................... SET_TRIS_B( 0xFF );
0007: MOVLW FF
0008: TRIS 6
....................
.................... OUTPUT_A(0x00);
0009: MOVLW 00
000A: BSF 03.5
000B: MOVWF 05
000C: BCF 03.5
000D: CLRF 05
.................... Aux3=1;
000E: BSF 11.0
.................... Aux1 = input_b();
000F: MOVF 06,W
0010: MOVWF 0F
*******end 3º

This code is compiled into ccs ide, the above (1º and 2º) was compiled into mplab ide, the mplab ide discard the tris instruction. Can MPLAB IDE use the tris instruction?. Or I must to disable the tris option into ccs.

Thanks in advance
Bomba



Joined: 09 Dec 2003
Posts: 13

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correlation betwen HEX file
PostPosted: Fri Jan 23, 2004 10:09 am     Reply with quote
I correlated the HEX file generated by MPLABIDE and CCSIDE, and these files are equal, but the visualization omits the tris instruction into MPLAB.

Or I’m doing something wrong.

Thanks
Ttelmah
Guest
Re: CCS generated assembler
PostPosted: Fri Jan 23, 2004 10:21 am     Reply with quote
Bomba wrote:
See the second code, and tell my why pass at line 0009 without line 0008, compare it with the 1º. And other question is, second code in line 12: SET_TRIS_B( 0x0 ); do nothing (only line 0007)...

******* 1º
5: #use fast_io(B)
6:
7: void main()
8: {
000004 184 CLRF 0x4
000005 301F MOVLW 0x1f
000006 583 ANDWF 0x3, F
9: int Aux1,Aux2;
10: short Aux3;
11:
12: //SET_TRIS_B( 0x0 );
13:
14: //OUTPUT_A(0x00);
15: Aux3=1;
000007 1411 BSF 0x11, 0
16: Aux1 = input_b();
000008 806 MOVF 0x6, W
000009 08F MOVWF 0xf
****** end 1º

******2º
5: #use fast_io(B)
6:
7: void main()
8: {
000004 184 CLRF 0x4
000005 301F MOVLW 0x1f
000006 583 ANDWF 0x3, F
9: int Aux1,Aux2;
10: short Aux3;
11:
12: SET_TRIS_B( 0x0 );
000007 3000 MOVLW 0
13:
14: //OUTPUT_A(0x00);
15: Aux3=1;
000009 1411 BSF 0x11, 0
16: Aux1 = input_b();
00000A 806 MOVF 0x6, W
00000B 08F MOVWF 0xf
*****end 2º

See that:

*********3º
.................... #use fast_io(B)
....................
.................... void main()
.................... {
0004: CLRF 04
0005: MOVLW 1F
0006: ANDWF 03,F
.................... int Aux1,Aux2;
.................... short Aux3;
....................
.................... SET_TRIS_B( 0xFF );
0007: MOVLW FF
0008: TRIS 6
....................
.................... OUTPUT_A(0x00);
0009: MOVLW 00
000A: BSF 03.5
000B: MOVWF 05
000C: BCF 03.5
000D: CLRF 05
.................... Aux3=1;
000E: BSF 11.0
.................... Aux1 = input_b();
000F: MOVF 06,W
0010: MOVWF 0F
*******end 3º

This code is compiled into ccs ide, the above (1º and 2º) was compiled into mplab ide, the mplab ide discard the tris instruction. Can MPLAB IDE use the tris instruction?. Or I must to disable the tris option into ccs.

Thanks in advance

What do you think line 9 should do?. The compiler, does not 'clear' a memory location, unless you use static variables, or force an initialisation (int Aux1=0,Aux2=0;)
Hence the statement will generate no code, merely telling the compiler to assign a storage location to be used.
Are you sure the IDE 'discards' the TRIS, or does it just not display the code?. Unfortunately the TRIS instruction, is obsolete, but CCS keep using it. The instruction still works, but is not a 'recognised' disassembly value in some enviroments. If you look carefully at the addresses shown, the IDE, is showing that there is an instruction there (the address moves forward by 2), but just doesn't show disassembly for the instruction.
If you look at the contents of the TRIS register, before the instructions, and afterwards, you'll find it is being updated.

Best Wishes
Guest
PostPosted: Fri Jan 23, 2004 6:37 pm     Reply with quote
Hi Ttelmah

You have reason, I compare the HEX file generated by the MPLABIDE and CCSIDE, and they are identical.

Thank you!!
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