#include <exec/types.h>
#include <hardware/custom.h>
#include <hardware/dmabits.h>
#include <stdio.h>

/* This would work even without prototypes, but... */
extern LONG AllocChannels(void);
extern void FreeChannels(void);

/* This is a simple pulse waveform */
static UBYTE chip pulse[] = { -128,-128,-128,-128,127,127,127,127 };

extern struct Custom far custom; /* for audio hardware access */

void main()
{
	printf("AM/FM Synthetic sound generator V0.0001\n");
	if(AllocChannels()) {
		printf("Sorry, but the audio channels are in use.\n");
		return;
	}
	/* Now the channels are ours, exclusively */
	custom.aud[0].ac_ptr = (UWORD *)pulse;
	custom.aud[0].ac_len = 4;
	custom.aud[0].ac_per = 852;
	custom.aud[0].ac_vol = 40;
	custom.dmacon = DMAF_SETCLR|DMAF_AUD0; /* Audio 0 DMA on */
	Delay(50); /* annoy the user for one second */
	custom.dmacon = DMAF_AUD0; /* DMA off */
	FreeChannels();
}