[cc65] C to ASM passing variables

Hi,

Just a small question about sharing variables between C and ASM.

How can i pass a variable from a C module to an ASM module? For instance, from my main C program to an ASM raster interrupt handler routine.

I know how to do it from ASM to C:

asm module

_testvalue:
.byte $7

C module

extern unsigned char testvalue;

but don't know how to do it from C to ASM. Moreover, it is explained this stuff and any related (pass variables to ASM via functions parameters and use them) somewhere in the documentation?


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