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gba: add some const values for sound register configs to avoid magic numbers

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Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
2026-02-22 10:34:44 +01:00
committed by Ron Evans
parent 54ecf74261
commit 0a5875ab2e
1 changed files with 57 additions and 0 deletions
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src/device/gba/gba.go
+57
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@@ -825,3 +825,60 @@ const (
OAMOBJ_ATT2_PB_Pos = 0xC
OAMOBJ_ATT2_PB_Msk = 0xF
)
// Constants for SOUND: sound control
const (
SSW_INC = 0x0 // Increasing sweep rate
SSW_DEC = 0x0008 // Decreasing sweep rate
SSW_OFF = 0x0008 // Disable sweep altogether
SSQR_DUTY1_8 = 0x0 // 12.5% duty cycle (#-------)
SSQR_DUTY1_4 = 0x0040 // 25% duty cycle (##------)
SSQR_DUTY1_2 = 0x0080 // 50% duty cycle (####----)
SSQR_DUTY3_4 = 0x00C0 // 75% duty cycle (######--) Equivalent to 25%
SSQR_INC = 0x0 // Increasing volume
SSQR_DEC = 0x0800 // Decreasing volume
SFREQ_HOLD = 0x0 // Continuous play
SFREQ_TIMED = 0x4000 // Timed play
SFREQ_RESET = 0x8000 // Reset sound
SDMG_SQR1 = 0x01
SDMG_SQR2 = 0x02
SDMG_WAVE = 0x04
SDMG_NOISE = 0x08
SDMG_LSQR1 = 0x0100 // Enable channel 1 on left
SDMG_LSQR2 = 0x0200 // Enable channel 2 on left
SDMG_LWAVE = 0x0400 // Enable channel 3 on left
SDMG_LNOISE = 0x0800 // Enable channel 4 on left
SDMG_RSQR1 = 0x1000 // Enable channel 1 on right
SDMG_RSQR2 = 0x2000 // Enable channel 2 on right
SDMG_RWAVE = 0x4000 // Enable channel 3 on right
SDMG_RNOISE = 0x8000 // Enable channel 4 on right
SDS_DMG25 = 0x0 // Tone generators at 25% volume
SDS_DMG50 = 0x0001 // Tone generators at 50% volume
SDS_DMG100 = 0x0002 // Tone generators at 100% volume
SDS_A50 = 0x0 // Direct Sound A at 50% volume
SDS_A100 = 0x0004 // Direct Sound A at 100% volume
SDS_B50 = 0x0 // Direct Sound B at 50% volume
SDS_B100 = 0x0008 // Direct Sound B at 100% volume
SDS_AR = 0x0100 // Enable Direct Sound A on right
SDS_AL = 0x0200 // Enable Direct Sound A on left
SDS_ATMR0 = 0x0 // Direct Sound A to use timer 0
SDS_ATMR1 = 0x0400 // Direct Sound A to use timer 1
SDS_ARESET = 0x0800 // Reset FIFO of Direct Sound A
SDS_BR = 0x1000 // Enable Direct Sound B on right
SDS_BL = 0x2000 // Enable Direct Sound B on left
SDS_BTMR0 = 0x0 // Direct Sound B to use timer 0
SDS_BTMR1 = 0x4000 // Direct Sound B to use timer 1
SDS_BRESET = 0x8000 // Reset FIFO of Direct Sound B
SSTAT_SQR1 = 0x0001 // (R) Channel 1 status
SSTAT_SQR2 = 0x0002 // (R) Channel 2 status
SSTAT_WAVE = 0x0004 // (R) Channel 3 status
SSTAT_NOISE = 0x0008 // (R) Channel 4 status
SSTAT_DISABLE = 0 // Disable sound
SSTAT_ENABLE = 0x0080 // Enable sound. NOTE: enable before using any other sound regs
)