Header	{z88dk}/include/psg.h
Source	{z88dk}/z88dk/libsrc/psg
Include	#include <psg.h>
Linking	n/a
Compile	n/a
Comments

Very basic PSG interface library. It provides the channel activation and frequency conversion maths.

A minimal interface for the Commodore 128's SID is included.

Convert a frequency value to pulse count for the PSG data

Send data to the psg. "sound(reg, value)" is a valid alias.

Read the PSG register. Not supported on SID, use the SID specific calls.

Init the PSG (reset sound etc..) Not supported on SID.

Set a given tone for the channel (0-2)

Set the global noise period

Set channel's volume (not channel restricted on SID)

Set the volume envelope of number \a waveform, with the given period, on a group of channels (ORed bits)

Set noise or tone generation on a group of channels (ORed bits). Not supported on SID.

Get the group of channels currently generating tone (ORed bits). Not supported on SID.

extern unsigned char LIB psg_tone_channels();

Get the group of channels currently generating noise (ORed bits). Not supported on SID.