Tone Generator, Square Flags
[Memory map bit(fields)]

Bits for REG_SND{1,2,4}CNT (aka REG_SOUND1CNT_H, REG_SOUND2CNT_L, REG_SOUND4CNT_L, respectively). More...

Defines
#define	SSQR_DUTY1_8   0
	12.5% duty cycle (#-------)
#define	SSQR_DUTY1_4   0x0040
	25% duty cycle (##------)
#define	SSQR_DUTY1_2   0x0080
	50% duty cycle (####----)
#define	SSQR_DUTY3_4   0x00C0
	75% duty cycle (######--) Equivalent to 25%
#define	SSQR_INC   0
	Increasing volume.
#define	SSQR_DEC   0x0800
	Decreasing volume.
#define	SSQR_LEN_MASK   0x003F
#define	SSQR_LEN_SHIFT   0
#define	SSQR_LEN(n)   ((n)<<SSQR_LEN_SHIFT)
#define	SSQR_DUTY_MASK   0x00C0
#define	SSQR_DUTY_SHIFT   6
#define	SSQR_DUTY(n)   ((n)<<SSQR_DUTY_SHIFT)
#define	SSQR_TIME_MASK   0x0700
#define	SSQR_TIME_SHIFT   8
#define	SSQR_TIME(n)   ((n)<<SSQR_TIME_SHIFT)
#define	SSQR_IVOL_MASK   0xF000
#define	SSQR_IVOL_SHIFT   12
#define	SSQR_IVOL(n)   ((n)<<SSQR_IVOL_SHIFT)
#define	SSQR_ENV_BUILD(ivol, dir, time)   ( ((ivol)<<12) | ((dir)<<11) | (((time)&7)<<8) )
#define	SSQR_BUILD(_ivol, dir, step, duty, len)   ( SSQR_ENV_BUILD(ivol,dir,step) | (((duty)&3)<<6) | ((len)&63) )

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Detailed Description

Bits for REG_SND{1,2,4}CNT (aka REG_SOUND1CNT_H, REG_SOUND2CNT_L, REG_SOUND4CNT_L, respectively).

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