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Classic PSG Library

suborb edited this page Jan 20, 2019 · 1 revision

PSG (psg.h)

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.

sound API

psgT(hz)

Convert a frequency value to pulse count for the PSG data

set_psg (reg, val)

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

get_psg (reg)

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

psg_init()

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

psg_tone()

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

psg_noise (period)

Set the global noise period

psg_volume(channel, volume)

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

psg_envelope(waveform, period, channels)

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

psg_channels(tone_channels, noise_channels)

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

psg_tone_channels()

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

psg_noise_channels()

extern unsigned char LIB psg_tone_channels();

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

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