arm7/lib/src/SND_global.c


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#include "SND_global.h"

#include "SND_channel.h"
#include "SND_work.h"

#include "OS_system.h"
#include "PM.h"
#include "registers.h"
#include "syscall.h"

void SND_Enable(void)
{
    reg_SOUNDCNT_MIX |= 0x80;
}

void SND_Disable(void)
{
    reg_SOUNDCNT_MIX &= ~0x80;
}

void SND_Shutdown(void)
{
    SND_Disable();

    for (int i = 0; i < SND_CHANNEL_COUNT; i++)
    {
        SND_StopChannel(i, 1);
    }

    reg_SNDCAPxCNT(0) = 0;
    reg_SNDCAPxCNT(1) = 0;
}

void SND_BeginSleep(void)
{
    SND_Disable();
    SVC_SoundBiasReset(0x80);
    OS_SpinWait(0x40000);
    PMi_ResetControl(1);
    reg_POWCNT2 &= ~1;
}

void SND_EndSleep(void)
{
    reg_POWCNT2 |= 1; // enable speakers
    PMi_SetControl(1);
    SVC_SoundBiasSet(0x100);
    OS_SpinWait(0x7AB80); // what does this wait for and how long does it wait?
    SND_Enable();
}

void SND_SetMasterVolume(int vol)
{
    reg_SOUNDCNT_VOL = (u8)vol;
}

void SND_SetOutputSelector(
    int leftOutputFrom, int rightOutputFrom, int outputCh1ToMixer, int outputCh3ToMixer)
{
    int masterEnable = (reg_SOUNDCNT_MIX & 0x80) ? 1 : 0;
    reg_SOUNDCNT_MIX = (u8)((masterEnable << 7) | (outputCh3ToMixer << 5) |
                            (outputCh1ToMixer << 4) | (rightOutputFrom << 2) | (leftOutputFrom));
}