Re: [Sdcc-user] Linking to assembler routines in ROM

[Bernhard H. <Ber...@be...>]

> I'm using the Z80 version of SDCC/ Z80 port of SDCC/ support of Z80 on
SDCC.
>
> I would like to link a C program with assembler routines that are
> already programmed in an EPROM.
>
>
> Here is the example code that I would like to run:
>
> extern void SerialPutString(unsigned char *str); // 0x0C98
>
> #include <stdio.h>
>
> #include "rom_mini.h"
>
> void main(void)
> {
>   SerialPutString("Hello world");
> }
>
>
> How do I tell the linker that 'such external routine is at which address'
?
I've no idea, if this applies to the z80 port, but on mcs51 you have to use
function pointers:

typedef void (*func_ptr)(unsigned char *str) reentrant;

func_ptr SerialPutString = (func_ptr) 0x0C98;

void main(void)
{
  (*SerialPutString) ("Hello world");
}

Bernhard