18
votes
Accepted
cprintf printing invisible characters in C program on VIC 20
The Fix for cc65
This was discussed in cc65 issue #946 and fixed by
cc65 PR #965. That was merged to the master branch on
2019-10-26, and should appear in V2.19 of cc65. (I don't know when
that ...
- 28k
14
votes
Accepted
Labels in cc65 inline assembler with #define macro
Since the inline assembler of cc65 doesn't accept anonymous labels (from my other answer), another approach is to provide a unique suffix to the labels, which can be applied by the macro. The ...
- 16.9k
12
votes
Accepted
Different handling of ASCII interpretation between ca65 and cl65
Simple reason
CL65 is using "C64" target as default, while CA65 uses "none".
Adding a -t none should make this disappear.
Details:
The CL65 documentation for -t does clearly point ...
- 236k
11
votes
Accepted
Macro for counted string accepting multiple arguments?
TL;DR:
This macro will solve your issues:
.feature string_escapes
.macro PString Arg
.byte :++ - :+
: .byte Arg
:
.endmacro
When called with more than one argument the ...
- 236k
8
votes
Accepted
Adding control characters to string constants in ca65 assembler
Is there an escape character in ca65 to add such commands to a text string?
In general: No.
The whole ASCII(Z) mechanic is meant to write device independent code, so adding device specific sequences ...
- 236k
8
votes
Accepted
Printing German umlauts with cc65
Your source is most likely in ISO 8859-1 (or -15) encoded (*1), so the compiler has to do code conversion between character literals in your source and the designated target. Without a specifying a ...
- 236k
6
votes
Accepted
How to pass a value to an inline assembler script in a #define macro in cc65
There is a pseudo variable __AX__ of type unsigned int that can be assigned a value that then ends up in register A (lo byte) and X (hi byte). So, the following macro definition works as intended:
#...
- 4,531
6
votes
Efficiently defining a C function by given address in cc65
Preface: I'm not the world greatest C expert - not at least as I dislike C quite a lot :))
What Happenes
The general issue here is that CC65 puts the address into a pointer variable, visible when ...
- 236k
5
votes
Accepted
Putting code into two different memory areas with cc65/ca65
(Caveat: This is from memory with a quick peek into the manual. So some reply after trying it might be useful.)
TL;DR;
Fill it
Try fill=yes (*1) for the memory area of MAIN and make HIMEMSEG overwrite ...
- 236k
5
votes
Accepted
CC65 ignores request to correctly offset memory areas in output files
[I'm not sure what the issue is, as the wording isn't very clear, so I might entirely misinterprete this.]
Given that I said the memory areas begin at $4000 and $8000, I was expecting to see the ...
- 236k
4
votes
How to assign code to different PRG-ROM banks on an NES ROM using ca65/ld65
How do I set up multiple banks on an NES ROM using ca65/ld65?
Do you have a clear description how that ROM structured? Or, nowadays it's more like, how the 'ROM' file structure for that system (and ...
- 236k
4
votes
Accepted
Is there a way to have the ca65 assembler only expand macros?
It appears the answer is no: ca65 is a single-pass assembler and unlike C and NASM, there is not a stand-alone preprocessing stage in the assembly process. Moreover, the design of some of the ...
- 25.2k
4
votes
Labels in cc65 inline assembler with #define macro
You can use anonymous labels in ca65. The equivalent to your example code using these, but without the C wrapping, would be:
CMP #$60
BCC :+
AND #$DF
BNE :++
: AND #$3F
:
You can also use :- ...
- 16.9k
3
votes
Accepted
How to read disk files using CBM specific functions in cc65 with proper error checking
Adding this to the code as per @tofro's suggestion:
unsigned char kernel_getin(void *ptr, unsigned char *size)
{
unsigned char * data = (unsigned char *)ptr;
unsigned char i;
unsigned ...
- 938
3
votes
Accepted
How do I save data from a program with CC65
Here is an example of using (mostly) the C library functions to write and read data to/from a file. The _filetype is an addition to select the file type. For data storage on the CBM machines, ...
- 4,531
2
votes
How do I save data from a program with CC65
The previous answer is probably sufficient. But in case you need more examples, in DestinyHunter I wrote a level-editor that compiled with cc65. The specific source is in:
https://github.com/...
- 129
2
votes
Printing German umlauts with cc65
I would expect that the CC65 compiler, like most compilers, would output string literals using whatever sequence of bytes appears in the source file. If you want to ensure that particular byte values ...
- 39.2k
2
votes
Accepted
ca65 vs tass syntax: converting a hex address to decimal?
ca65 was designed as a single-pass assembler. So this works:
addr = 4096
.byte $9e,.sprintf("%d", addr)
but this does not:
.byte $9e,.sprintf("%d", addr)
addr = ...
- 9,368
2
votes
Accepted
Is there a way to use .ident or * (PC) in numeric macro variables (using .set)?
Like the name says, they are numeric variables. They can hold numbers and nothing else. This is confirmed by the documentation.
I would instead try something like this:
__word_last .set 0
__word_0 = 0
...
- 25.2k
1
vote
Macro for counted string accepting multiple arguments?
ca65 doesn't seem particularly retro to me but you could do it recursively:
.macro StringHelper p0, p1, p2, p3, p4
.ifnblank p0
.byte p0
StringHelper p1, p2, p3, p4
.endif
....
- 3,060
1
vote
Accepted
Efficiently defining a C function by given address in cc65
Thanks for the discussions and suggestions. I summarize here the multiple ways to define a function with a given address as a C function.
Assigning a function pointer
The call described in the ...
- 4,531
1
vote
Efficiently defining a C function by given address in cc65
While I've not actually used CC65, I'm familiar with the 6502, and I would expect that if you do something like:
unsigned char springboard[5]; // At file scope
...
... within a function
((void(*)(...
- 39.2k
1
vote
Putting code into two different memory areas with cc65/ca65
The solution is to declare the MAIN memory region's size so it ends at the start of the HIMEM memory region and then add fill=yes to MAIN so it get's filled. This will have the same result as using * ...
- 319
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