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Slammer
Registered: Feb 2004
Posts: 416 |
Kick Assembler Thread 2
The previous thread took a little long to load, so this is a new fresh one.. |
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... 592 posts hidden. Click here to view all posts....
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Carlos
Account closed
Registered: Mar 2009
Posts: 15 |
Yeah.. this was my second approach but, as far as i know, i can't use a memory location as the parameter of a KickAss macro. I have tested it and the assembler gives no error but nothing happens:
read_joy:
lda $dc00
lsr
bcc joy_up
jmp read_joy
joy_up:
inc color
:setBackground(color)
jmp read_joy
color: .byte 0
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Change the macro to this, to avoid immediate addressing mode:
.macro setBackground(color) {
lda color
sta $d021
} |
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Carlos
Account closed
Registered: Mar 2009
Posts: 15 |
Great! didn't notice that.. thks Cruzer. |
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Slammer
Registered: Feb 2004
Posts: 416 |
Once you get more comfortable with the basic stuff, you can start using pseudocommands, which support both things at once.
.pseudocommand setBackground(color) {
lda color
sta $d021
}
:setBackground #color // Use predetermined value (immediate mode)
:setBackground color // Use value from memory (absolute mode)
Btw. The background color macro is just an example of how to create and use a macro. I guess you cant benefit much by using this particular macro.. |
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Carlos
Account closed
Registered: Mar 2009
Posts: 15 |
Interesting Slammer, i will try it.
Another question: User defined structures. Can the fields of the structure be of any size or each field is always a byte?
.struct foo {x , y) (i want x be a word and y a byte) |
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Slammer
Registered: Feb 2004
Posts: 416 |
The struct directive is just a collection of fields with no particular type. The fields can be anything: Numbers, lists, strings, etc. For example:
.stuct MyStruct {a, b}
.var myVar = MyStruct(27, "Hello World")
.byte myVar.a // is the same as .byte 27
.print myVar.b // is the same as .print "Hello world"
In the above example only the '.byte myVar.a' directive will produce output to the assembled .prg file. It will be a byte because a .byte directive is used, but if you had written .word myVar.a it would have been a word.
hope it helped..
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chatGPZ
Registered: Dec 2001
Posts: 11147 |
mmmmh. whats the difference between a struct and a namespace then? *shrug* |
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Pantaloon
Registered: Aug 2003
Posts: 124 |
groepaz, you dont know the difference between namespace & structs ? i hope you are trolling :) |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
Groepaz doesn't even know the difference between .align and .fill :P |
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Oswald
Registered: Apr 2002
Posts: 5028 |
Probably I'm off with this here, but do we really need all this mumbo jumbo for some simple 8 bit demo effects? Namespaces, structs, macros and whatnots ? :) Anyway its just probably only me still stuck in '96 or so, it would be nice to see some examples on how are these *really* useful. when it comes cycle counting and it comes to that even with non timing critical code, you'll WANT to see the code. Speedcode generators have to be written eventually when linking the demo (so why write once a macro, once a real version?)
etc.. |
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