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Fix PDM mic transfer rate - use MICS_TO_AUD_RATIO

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This commit is contained in:
Sam Chesney
2017-02-14 16:54:25 +00:00
parent c85d8206e2
commit b79cf43593
1 changed files with 19 additions and 1 deletions
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20
module_usb_audio/audio_io/audio_io.xc
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@@ -501,6 +501,7 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
#endif
unsigned usbToAudioRatioCounter = 0;
unsigned micsToAudioRatioCounter = 0;
#if (USB_TO_AUD_RATIO > 1)
union i2sInDs3
@@ -520,6 +521,18 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
memset(&i2sOutUs3.delayLine, 0, sizeof i2sOutUs3.delayLine);
#endif /* (USB_TO_AUD_RATIO > 1) */
/* Get initial samples from PDM->PCM converter to avoid stalling the decimators */
c_pdm_pcm <: 1;
master
{
#pragma loop unroll
for(int i = PDM_MIC_INDEX; i < (NUM_PDM_MICS + PDM_MIC_INDEX); i++)
{
c_pdm_pcm :> samplesIn[readBuffNo][i];
}
}
UserBufferManagementInit(i_audMan);
unsigned command = DoSampleTransfer(c_out, readBuffNo, underflowWord, i_audMan);
@@ -809,7 +822,7 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
#endif
#if (NUM_PDM_MICS > 0)
if ((USB_TO_AUD_RATIO - 1) == usbToAudioRatioCounter)
if ((MICS_TO_AUD_RATIO - 1) == micsToAudioRatioCounter)
{
/* Get samples from PDM->PCM converter */
c_pdm_pcm <: 1;
@@ -821,6 +834,11 @@ unsigned static deliver(chanend c_out, chanend ?c_spd_out,
c_pdm_pcm :> samplesIn[readBuffNo][i];
}
}
micsToAudioRatioCounter = 0;
}
else
{
++micsToAudioRatioCounter;
}
#endif
}