How make a program transfer asm to hex

Wilksey · Feb 9, 2010

Ok,

Take this example:

Code:

BCF f,b = 01 00bb bfff ffff

BCF f, b - f = the FILE register, so STATUS for example, b = the 8 bit address within the FILE register, we will use RP0.
Looking at the STATUS and RP0 from the MPASM INC file we can see that:

Code:

STATUS = 0003 = 0011(Binary)
RP0 = 0005 = 0101(Binary)

So from the original code we can assemble this as:

Code:

01 00bb bfff ffff

=

01 0010 1000 0011

= 1283 (Compiled HEX code for BCF STATUS, RP0)

In reverse (Disassemble):

Code:

1283 Hex =

01 0010 1000 0011

=

01 00bb bfff ffff

= 

000 0011 = 03 = Status Register
10 1 = 05 = RP0 Bit
01 00 = BCF

Nigel, please correct me if I am wrong on this example and / or any information I have missed.

Wilksey

ss-0à · Feb 10, 2010

Wilksey said:
Ok,

Take this example:

Code:

BCF f,b = 01 00bb bfff ffff

BCF f, b - f = the FILE register, so STATUS for example, b = the 8 bit address within the FILE register, we will use RP0.
Looking at the STATUS and RP0 from the MPASM INC file we can see that:

Code:

STATUS = 0003 = 0011(Binary) RP0 = 0005 = 0101(Binary)

So from the original code we can assemble this as:

Code:

01 00bb bfff ffff = 01 0010 1000 0011 = 1283 (Compiled HEX code for BCF STATUS, RP0)

In reverse (Disassemble):

Code:

1283 Hex = 01 0010 1000 0011 = 01 00bb bfff ffff = 000 0011 = 03 = Status Register 10 1 = 05 = RP0 Bit 01 00 = BCF

Nigel, please correct me if I am wrong on this example and / or any information I have missed.

Wilksey

THIS CODE IS IN THE ASSEMBLY

Code:

bsf           03h,5     ;Go to Bank 1
movlw      00h       ;Put 00000 into W
movwf      85h       ;Move 00000 onto TRISA – all pins set to output
bcf           03h,5     ;Come back to Bank 0
movlw      01h       ;Write 01h to the W register.  In binary this is 00001, which
                            ;puts a ‘1’ on bit 1 (pin 17) while keeping the other pins to ‘0’ 
movwf      05h       ;Now move the contents of W (02h) onto the PortA, whose
                            ;address is 05h

IN MIKROC

Code:

void main() {
TRISB=0B00000000;
PORTB=0B00000001;
}

I C0MPILED IT WITH MICROC I THINK IT IS THE SAME WHEN WHEN WE COMPILE IT WITH MPASM

Code:

:020000001528C1
:0C00060083120D088A000C08820008001C
:1000120003208A110A128000840A8C0A03198D0AAD
:08002200C003031D09280800BA
:0C002A00831686010130831286001A281C
:02400E00FA3F77
:00000001FF

So let's take the instruction BSF

BSF 03h,5 ;Go to Bank 1

BSF f,b = 01 01bb bfff ffff

BSF=0101
status register=0000011
RP0=101

01 0110 1000 0011
1683H

but when i looked for it in the hex file WHICH I BUT IT above but i didn't find it!!

Nigel Goodwin · Feb 10, 2010

ss-0à said:
Code:

:020000001528C1 :0C00060083120D088A000C08820008001C :1000120003208A110A128000840A8C0A03198D0AAD :08002200C003031D09280800BA :0C 002A 00 [COLOR="red"]8316[/COLOR] 8601 0130 8312 8600 1A28 1C :02400E00FA3F77 :00000001FF

So let's take the instruction BSF

01 0110 1000 0011
1683H

but when i looked for it in the hex file WHICH I BUT IT above but i didn't find it!!

Why didn't you read the HEX file format details I posted - I've marked it for you.

ss-0à · Feb 10, 2010

thank you for your help
but why it is Inverse?
and i want to ask you
8316 is the first instruction of my code which is BSF 03h,5 but why in the hex file there are many hexadecimal befor it !!

ss-0à · Feb 10, 2010

i understand you now

:0C =12 in decimal representing the number of data bytes that will appear on the line.
002A =which address??
00 =which type?????
8316 8601 0130 8312 8600 1A28 =A two digit hexadecimal data byte, presented in low byte/high byte combinations.
1C=checksum

Nigel Goodwin · Feb 10, 2010

ss-0à said:
i understand you now
:0C =12 in decimal representing the number of data bytes that will appear on the line.
002A =which address??
00 =which type?????
8316 8601 0130 8312 8600 1A28 =A two digit hexadecimal data byte, presented in low byte/high byte combinations.
1C=checksum

Those two question are again explained in the section of helpfile I posted.

I would also suggest you don't use MikroC to create HEX files to examine, as you don't know what the code created is going to be. Use assembler instead, so you know EXACTLY what's supposed to be the result - C compilers also create absolutely horrible assembler code, very hard to understand what it's supposed to be doing.

ss-0à · Feb 10, 2010

Ok, if i find a file in hex and i want to disassemble it (build a dissambler) the disassembler didn't know here with which compiler it compiled and i think the hexadicimal file has one job in the pic so it has the same information,that's mean the hex should be the same?

kchriste · Feb 10, 2010

If a program is written in C and compiled into a HEX file, a disassembler will give you an assembly code listing and NOT the original C code.

blueroomelectronics · Feb 10, 2010

I've read this entire thread and have no idea what the OP wants.

ss-0à · Feb 10, 2010

blueroomelectronics said:
I've read this entire thread and have no idea what the OP wants.

At the first time i wanted to build my own compiler i mean program transfer ASSEMBLY code to HEXADECIMAL code but they told me it is very difficult to do that .
then i changed my mind and i decided to built a disassembler for a pic 16F84 ,could you participate with us?

ss-0à · Feb 10, 2010

Wilksey said:
Ok,

Take this example:

Code:

BCF f,b = 01 00bb bfff ffff

BCF f, b - f = the FILE register, so STATUS for example, b = the 8 bit address within the FILE register, we will use RP0.
Looking at the STATUS and RP0 from the MPASM INC file we can see that:

Code:

STATUS = 0003 = 0011(Binary) RP0 = 0005 = 0101(Binary)

So from the original code we can assemble this as:

Code:

01 00bb bfff ffff = 01 0010 1000 0011 = 1283 (Compiled HEX code for BCF STATUS, RP0)

In reverse (Disassemble):

Code:

1283 Hex = 01 0010 1000 0011 = 01 00bb bfff ffff = 000 0011 = 03 = Status Register 10 1 = 05 = RP0 Bit 01 00 = BCF

Nigel, please correct me if I am wrong on this example and / or any information I have missed.

Wilksey

please ,Could you explain to me the instruction MOWLW 00h too

Wilksey · Feb 10, 2010

MOVLW?

Move Literal to W (Working Register) aka Accumulator.

Code:

MOVLW 11 00xx kkkk kkkk

xx means "dont care" so we can assume 00 for this.
kkkk kkkk means literal constant, in this case 00 so we can assume all 0's for this.

Code:

MOVLW 11 0000 0000 0000

= 3000 Hex

In reverse (Disassemble):

Code:

3000 Hex = 11000000000000

Closest match to 1100 is MOVLW (11 00xx)

0000 0000 = kkkk kkkk = 0

00 = xx

11 00 = MOVLW

It can be just as difficult to make a disassembler as it can to make an assembler.

Wilksey

Nigel Goodwin · Feb 11, 2010

Wilksey said:
It can be just as difficult to make a disassembler as it can to make an assembler.

Actually a disassembler for the 14 bit (and 12 bit) PIC's is VERY easy to do, which is why I happened to write one, and integrate it in PicProg (the DOS predecessor to WinPicProg). In fact the first version of PicProg was written while I was awaiting the arrival of a PCB for a programmer from Dontronics in Australia - which took about 5 days - I added the disassembler in the later part of the 5 days, as I'd finished the programmer software (with the exception of testing it).

ss-0à · Feb 11, 2010

Wilksey said:
MOVLW?

Move Literal to W (Working Register) aka Accumulator.

Code:

MOVLW 11 00xx kkkk kkkk

xx means "dont care" so we can assume 00 for this.
kkkk kkkk means literal constant, in this case 00 so we can assume all 0's for this.

Code:

MOVLW 11 0000 0000 0000 = 3000 Hex

In reverse (Disassemble):

Code:

3000 Hex = 11000000000000 Closest match to 1100 is MOVLW (11 00xx) 0000 0000 = kkkk kkkk = 0 00 = xx 11 00 = MOVLW

Wilksey

thank you very much

Nigel Goodwin said:
Actually a disassembler for the 14 bit (and 12 bit) PIC's is VERY easy to do, which is why I happened to write one, and integrate it in PicProg (the DOS predecessor to WinPicProg). In fact the first version of PicProg was written while I was awaiting the arrival of a PCB for a programmer from Dontronics in Australia - which took about 5 days - I added the disassembler in the later part of the 5 days, as I'd finished the programmer software (with the exception of testing it).

could you tell me the steps to write one?

Nigel Goodwin · Feb 11, 2010

You can download my original 16 bit Delphi 1.0 source code from **broken link removed** the earlier versions of IC-Prog seemed to be partially derived from this, as it even had my copyright notice in the disassembled code it produced.

ss-0à · Feb 11, 2010

thank you very much Nigel Goodwin

i will see the code if there is ambiguity i will ask you

Nigel Goodwin · Feb 11, 2010

ss-0à said:
thank you very much Nigel Goodwin

i will see the code if there is ambiguity i will ask you

Well checking the dates in that file, it's been 11 years since I've seen it!

Wilksey · Feb 11, 2010

It is easy if you have the understanding in the beginning, but for a "newbie" it can be difficult.

Wilksey

ss-0à · Feb 12, 2010

your pic Software support 4 Pics
you divided the command to 4 parts
Pattern : $3000; Mask : $fc00; CmdType : 4; Mnemonic : 'MOVLW'
What does it mean Mask and and CmdType(command Type) why you gave it this form?
you 11 years that's mean you have a good exprience and it is very easy to tou to write a compiler for the pic16F84

Wilksey said:
It is easy if you have the understanding in the beginning, but for a "newbie" it can be difficult.

Wilksey

I will be expert if you help me

Nigel Goodwin · Feb 13, 2010

ss-0à said:
your pic Software support 4 Pics
you divided the command to 4 parts
Pattern : $3000; Mask : $fc00; CmdType : 4; Mnemonic : 'MOVLW'
What does it mean Mask and and CmdType(command Type) why you gave it this form?
you 11 years that's mean you have a good exprience and it is very easy to tou to write a compiler for the pic16F84

Two points, one I never said writing a compiler was easy (I said writing a disassembler was easy), two, you've never mentioned a compiler before - do you mean an assembler? (a compiler is a high level language, not assembler).

Read through the code and it should become fairly clear, see which commands have which command type.

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