reSIDfp::EnvelopeGenerator Class Reference

#include <EnvelopeGenerator.h>

Public Member Functions
void	clock ()
unsigned int	output () const
void	reset ()
void	writeCONTROL_REG (unsigned char control)
void	writeATTACK_DECAY (unsigned char attack_decay)
void	writeSUSTAIN_RELEASE (unsigned char sustain_release)
unsigned char	readENV () const

Detailed Description

A 15 bit LFSR is used to implement the envelope rates, in effect dividing the clock to the envelope counter by the currently selected rate period.

In addition, another 5 bit counter is used to implement the exponential envelope decay, in effect further dividing the clock to the envelope counter. The period of this counter is set to 1, 2, 4, 8, 16, 30 at the envelope counter values 255, 93, 54, 26, 14, 6, respectively.

Member Function Documentation

clock()

RESID_INLINE void reSIDfp::EnvelopeGenerator::clock

(

)

SID clocking.

output()

unsigned int reSIDfp::EnvelopeGenerator::output ( ) const

inline

Get the Envelope Generator digital output.

readENV()

unsigned char reSIDfp::EnvelopeGenerator::readENV ( ) const

inline

Return the envelope current value.

Returns

envelope counter value

reset()

void reSIDfp::EnvelopeGenerator::reset

(

)

SID reset.

writeATTACK_DECAY()

void reSIDfp::EnvelopeGenerator::writeATTACK_DECAY

(

unsigned char

attack_decay

)

Write Attack/Decay register.

Parameters

attack_decay

attack/decay value

writeCONTROL_REG()

void reSIDfp::EnvelopeGenerator::writeCONTROL_REG

(

unsigned char

control

)

Write control register.

Parameters

control

control register value

writeSUSTAIN_RELEASE()

void reSIDfp::EnvelopeGenerator::writeSUSTAIN_RELEASE

(

unsigned char

sustain_release

)

Write Sustain/Release register.

Parameters

sustain_release

sustain/release value

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The documentation for this class was generated from the following files:

• EnvelopeGenerator.h
• EnvelopeGenerator.cpp