Barcode reader with PIC16f877A ?

[iugmoh]

[QUOTE=skimask;49542]One of the problems you're going to have is the fact that you won't get an interrupt in the middle of a statement.
QUOTE]

oky I avoid this problem by placing If statement " If but1=0 " which all commands inside this if statement will not execute untill I press the button placed on portb.2

but I want to ask if there is something wrong in my code

[skimask]

oky I avoid this problem by placing If statement " If but1=0 " which all commands inside this if statement will not execute untill I press the button placed on portb.2

You sure did...missed that one, but it's still a valid point for future reference.

but I want to ask if there is something wrong in my code

Does it work?

If code_works = 1 then
nothing_wrong_with_code = 1
else
nothing_wrong_with_code = 0
something_wrong_with_code = 1
endif

[iugmoh]

You sure did...missed that one, but it's still a valid point for future

oky for testing my code I insert ID card with this number "120063718" and the barcode give me a sound that the scanning completed , then if the scanning stage I pressed the button to display the data collected from this barcode reader the data output as follows

counter=96
data bits=
10100001001111100010000011111100111110001000000111 0100101101011000000111010000011111100 ...........

I want to know how to decode this data to display this ID number 120063718

[skimask]

oky for testing my code I insert ID card with this number "120063718" and the barcode give me a sound that the scanning completed , then if the scanning stage I pressed the button to display the data collected from this barcode reader the data output as follows
counter=96
data bits=
10100001001111100010000011111100111110001000000111 0100101101011000000111010000011111100 ...........
I want to know how to decode this data to display this ID number 120063718

For one thing, we don't know which barcode scanner you're using (not that it would matter much).
Second thing, how does your scanner encode the information that it outputs?
Obviously you've got data there. Whether it's good data or not is another story.
What do the dots mean? Do they mean that there is more data to follow or are those the end of the string?
Is this some sort of ASCII encoded data? BCD? Grey code? Otherwise? 8 bit data chunks? 12 bit? 4 bit repeated/inverted?

[iugmoh]

For one thing, we don't know which barcode scanner you're using

oky, my barcode reader type is "PS/2 Keyboard Wedge Barcode Scanner" and I test it with my PS/2 PC port , which when i insert the ID card it's automatically display the number "120063718" with new line

I know that the problem is how to know how encoding is done ?

[skimask]

oky, my barcode reader type is "PS/2 Keyboard Wedge Barcode Scanner" and I test it with my PS/2 PC port , which when i insert the ID card it's automatically display the number "120063718" with new line

I know that the problem is how to know how encoding is done ?

Then you'll probably have to get a list of the actual PS/2 scancodes relating to various keypresses, numeric, alpha, whatever. Probably throw all of those into a lookup table, crunch the table and get your keypress out of it.
Basically, you're building a PS/2 keyboard reader. I'd be willing to bet that if you found some PS/2 reader code somewhere for plugging in a standard keyboard, that it would actually work.

[iugmoh]

I will thank you another time for your patience, I understand that you are meaning that I can replace my barcode reader by a keyboard and pressing the same ID number to know how each number is encoding

oky i will try this