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Simplified TDM buffer to reduce copying.

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Ross Owen
2014-11-19 15:52:37 +00:00
parent 2b85adc01d
commit 8d6ef4d1d4
1 changed files with 5 additions and 7 deletions
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12
module_usb_audio/audio.xc
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@@ -585,14 +585,12 @@ chanend ?c_adc)
#ifdef I2S_MODE_TDM #ifdef I2S_MODE_TDM
if(tdmCount == 0) if(tdmCount == 0)
{ {
/* First time around we get channel 7 of TDM8 */
for(int i = 0; i < I2S_CHANS_ADC; i += 8) for(int i = 0; i < I2S_CHANS_ADC; i += 8)
{ {
asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++])); asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
samplesIn[7] = bitrev(sample); samplesIn[7] = samplesInPrev[7];
} samplesInPrev[7] = bitrev(sample);
for(int i = 0; i< 7; i++)
{
samplesIn[i] = samplesInPrev[i];
} }
} }
else else
@@ -600,7 +598,7 @@ chanend ?c_adc)
for(int i = 0; i < I2S_CHANS_ADC; i += 8) for(int i = 0; i < I2S_CHANS_ADC; i += 8)
{ {
asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++])); asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
samplesInPrev[(2*tdmCount)+i-1] = bitrev(sample); samplesIn[(2*tdmCount)+i-1] = bitrev(sample); // channels 1, 3, 5.. on each line.
} }
} }
#else #else
@@ -686,7 +684,7 @@ chanend ?c_adc)
{ {
asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++])); asm volatile("in %0, res[%1]" : "=r"(sample) : "r"(p_i2s_adc[index++]));
//samplesIn[(2*tdmCount)+i+1] = bitrev(sample); //samplesIn[(2*tdmCount)+i+1] = bitrev(sample);
samplesInPrev[2*tdmCount+i] = bitrev(sample); samplesIn[2*tdmCount+i] = bitrev(sample); // Channels 0, 2, 4.. on each line.
} }
#else #else
for(int i = 0; i < I2S_CHANS_ADC; i += 2) for(int i = 0; i < I2S_CHANS_ADC; i += 2)