psg.h File Reference

PSG support. More...

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Macros
#define	PSG_PORT   0xC00011
	PSG port address.
#define	PSG_ENVELOPE_MIN   15
	Minimum PSG envelope value.
#define	PSG_ENVELOPE_MAX   0
	Maximum PSG envelope value.
#define	PSG_NOISE_TYPE_PERIODIC   0
	Periodic noise type (like low-frequency tone).
#define	PSG_NOISE_TYPE_WHITE   1
	White noise type (hiss).
#define	PSG_NOISE_FREQ_CLOCK2   0
	Noise frequency = PSG clock / 2 (less coarse).
#define	PSG_NOISE_FREQ_CLOCK4   1
	Noise frequency = PSG clock / 4.
#define	PSG_NOISE_FREQ_CLOCK8   2
	Noise frequency = PSG clock / 8 (more coarse).
#define	PSG_NOISE_FREQ_TONE3   3
	Noise frequency = Tone generator #3.
#define	PSG_init()

Functions
void	PSG_reset (void)
	Reset PSG chip.
void	PSG_write (u8 data)
	Write to PSG port.
void	PSG_setEnvelope (u8 channel, u8 value)
	Set envelope level.
void	PSG_setTone (u8 channel, u16 value)
	Set tone.
void	PSG_setToneLow (u8 channel, u8 value)
	Partial set tone (low bit only b3-b0).
void	PSG_setFrequency (u8 channel, u16 value)
	Set frequency.
void	PSG_setNoise (u8 type, u8 frequency)
	Set noise type and frequency.

Detailed Description

PSG support.

Author

Stephane Dallongeville

Date

08/2011

This unit provides access to the PSG through the 68000 CPU

Macro Definition Documentation

PSG_init

#define PSG_init

(

)

Value:

_Pragma("GCC error \"This method is deprecated, use PSG_reset() instead.\"")

Function Documentation

PSG_setEnvelope()

void PSG_setEnvelope	(	u8	channel,
		u8	value )

Set envelope level.

Parameters

channel	Channel we want to set envelope (0-3).
value	Envelope level to set (PSG_ENVELOPE_MIN - PSG_ENVELOPE_MAX).

Set envelope level for the specified PSG channel.

PSG_setFrequency()

void PSG_setFrequency	(	u8	channel,
		u16	value )

Set frequency.

Parameters

channel	Channel we want to set frequency (0-3).
value	Frequency value to set in Hz (0-4095).

Set frequency for the specified PSG channel.
This method actually converts the specified frequency value in PSG tone value.

PSG_setNoise()

void PSG_setNoise	(	u8	type,
		u8	frequency )

Set noise type and frequency.

Parameters

type	Noise type, accepted values are: PSG_NOISE_TYPE_PERIODIC PSG_NOISE_TYPE_WHITE
frequency	Noise frequency, accepted values are: PSG_NOISE_FREQ_CLOCK2 PSG_NOISE_FREQ_CLOCK4 PSG_NOISE_FREQ_CLOCK8 PSG_NOISE_FREQ_TONE3

PSG_setTone()

void PSG_setTone	(	u8	channel,
		u16	value )

Set tone.

Parameters

channel	Channel we want to set tone (0-3).
value	Tone value to set (0-1023).

Set direct tone value for the specified PSG channel.

PSG_setToneLow()

void PSG_setToneLow	(	u8	channel,
		u8	value )

Partial set tone (low bit only b3-b0).

Parameters

channel	Channel we want to set tone (0-3).
value	Low bit (b3-b0) of tone value to set (0-15)

Set low part of tone value for the specified PSG channel.

PSG_write()

void PSG_write

(

u8

data

)

Write to PSG port.

Parameters

data	value to write to the port.

Write the specified value to PSG data port.