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Aminet 30
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Aminet 30 (1999)(Schatztruhe)[!][Apr 1999].iso
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GBDK-2.0.lha
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GBDK
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examples
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ram_fn.c
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C/C++ Source or Header
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1998-10-01
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1KB
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63 lines
#include <gb.h>
#include <stdio.h>
#include <string.h>
UWORD counter;
void inc()
{
counter++;
}
void print_counter()
{
printf(" Counter is %lu\n", counter);
}
void main()
{
extern UBYTE end_inc, start_inc;
/* Declare extern functions */
void inc_ram();
void inc_hiram();
/* Declare pointer-to-function variables */
void (*inc_ram_var)() = (void (*)())0xD000;
void (*inc_hiram_var)() = (void (*)())0xFFA0;
puts("Program Start...");
counter = 0;
/* Copy 'inc' to HIRAM at 0xFFA0 */
hiramcpy(0xA0U, (void *)&start_inc, (UBYTE)(&end_inc-&start_inc));
/* Copy 'inc' to RAM at 0xD000 */
memcpy((void *)0xD000, (void *)&start_inc, (UWORD)(&end_inc-&start_inc));
print_counter();
/* Call function in ROM */
puts("Call ROM");
inc();
print_counter();
/* Call function in RAM using link-time address */
puts("Call RAM direct");
inc_ram();
print_counter();
/* Call function in RAM using pointer-to-function variable */
puts("Call RAM indirect");
inc_ram_var();
print_counter();
/* Call function in HIRAM using link-time address */
puts("Call HIRAM direct");
inc_hiram();
print_counter();
/* Call function in HIRAM using pointer-to-function variable */
puts("Call HIRAM indirect");
inc_hiram_var();
print_counter();
puts("The End...");
}