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preliminary microphone code. requires an actual microphone. resulting audio is farty and blargy as fuck.

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This commit is contained in:
StapleButter
2018-12-12 16:33:40 +01:00
parent 24d6bd2786
commit 758bed93bc
5 changed files with 108 additions and 5 deletions
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37
src/SPI.cpp
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@ -453,6 +453,9 @@ u16 ConvResult;
u16 TouchX, TouchY;
s16 MicBuffer[1024];
int MicBufferLen;
bool Init()
{
@ -469,6 +472,8 @@ void Reset()
Data = 0;
ConvResult = 0;
MicBufferLen = 0;
}
void DoSavestate(Savestate* file)
@ -497,6 +502,13 @@ void SetTouchCoords(u16 x, u16 y)
TouchY <<= 4;
}
void MicInputFrame(s16* data, int samples)
{
if (samples > 1024) samples = 1024;
memcpy(MicBuffer, data, samples*sizeof(s16));
MicBufferLen = samples;
}
u8 Read()
{
return Data;
@ -520,7 +532,30 @@ void Write(u8 val, u32 hold)
{
case 0x10: ConvResult = TouchY; break;
case 0x50: ConvResult = TouchX; break;
case 0x60: ConvResult = 0x800; break; // TODO: mic
case 0x60:
{
if (MicBufferLen == 0)
ConvResult = 0x800;
else
{
// 560190 cycles per frame
u32 cyclepos = (u32)NDS::GetSysClockCycles(2);
u32 samplepos = (cyclepos * MicBufferLen) / 560190;
s16 sample = MicBuffer[samplepos];
// make it louder
//if (sample > 0x3FFF) sample = 0x7FFF;
//else if (sample < -0x4000) sample = -0x8000;
//else sample <<= 1;
// make it unsigned 12-bit
sample ^= 0x8000;
ConvResult = sample >> 4;
}
}
break;
default: ConvResult = 0xFFF; break;
}