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adding comments to apu registers

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roeming
2025-03-22 11:37:20 -04:00
parent 320d02452a
commit fcd788f44c
1 changed files with 6 additions and 0 deletions
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src/static/jaudio_NES/game/emusound.c
+6
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@@ -170,6 +170,7 @@ f32 NOISE_FREQ_TABLE[] = { 4.f, 2.f, 1.f, 0.5f, 0.25f, 0.2f, 0.15f, 0.12f
// https://www.nesdev.org/wiki/APU_registers
typedef struct _PulseChannel {
// https://www.nesdev.org/wiki/APU_Pulse
// $4000/$4004
u8 Duty : 2;
u8 EnvelopeLoopCounter : 1;
@@ -188,6 +189,7 @@ typedef struct _PulseChannel {
} PulseChannel;
typedef struct _TriangleChannel {
// https://www.nesdev.org/wiki/APU_Triangle
// $4008
u8 LengthCounter : 1;
u8 LinearCounterReloadVaue : 7;
@@ -201,6 +203,7 @@ typedef struct _TriangleChannel {
} TriangleChannel;
typedef struct _NoiseChannel {
// https://www.nesdev.org/wiki/APU_Noise
// $400C
u8 _unused_400C_high2 : 2;
u8 LoopEnvelope : 1;
@@ -218,6 +221,7 @@ typedef struct _NoiseChannel {
} NoiseChannel;
typedef struct _DMCChannel {
// https://www.nesdev.org/wiki/APU_DMC
// $4010
u8 IRQEnable : 1;
u8 LoopSample : 1;
@@ -261,6 +265,7 @@ typedef struct _APURegisters {
DMCChannel DMC;
// $4014
u8 _unused_4014;
// https://www.nesdev.org/wiki/APU#Status_($4015)
// $4015
u8 DMCInterrupt : 1;
u8 FrameInterrupt : 1;
@@ -272,6 +277,7 @@ typedef struct _APURegisters {
u8 Pulse1Status : 1;
// $4016
u8 _unused_4016;
// https://www.nesdev.org/wiki/APU#Frame_Counter_($4017)
// $4017
u8 FrameCounter_5FrameSequence : 1;
u8 FrameCounter_DisableFrameInterrupt : 1;