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Added basic PDM mic delay (based on MIC_BUFFER_DEPTH). Default, 1 sample.

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This commit is contained in:
xross
2018-01-08 11:38:26 +00:00
parent 90b8fe26cc
commit 727de0ac11
1 changed files with 20 additions and 4 deletions
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24
lib_xua/src/core/pdm_mics/pdm_mic.xc
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@@ -34,6 +34,10 @@ extern unsafe port p_mclk_in;
/* Delcared in main.xc */
extern clock clk_pdm;
#ifndef MIC_BUFFER_DEPTH
#define MIC_BUFFER_DEPTH 1
#endif
int mic_decimator_fir_data[8][THIRD_STAGE_COEFS_PER_STAGE * MAX_DECIMATION_FACTOR] = {{0}};
mic_array_frame_time_domain mic_audio[2];
@@ -50,7 +54,7 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
{
unsigned buffer;
unsigned samplerate;
int output[NUM_PDM_MICS];
int output[MIC_BUFFER_DEPTH][NUM_PDM_MICS];
#ifdef MIC_PROCESSING_USE_INTERFACE
i_mic_process.init();
@@ -64,6 +68,9 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
unsigned decimatorCount = 1;
#endif
unsigned micBufferWrite = (MIC_BUFFER_DEPTH -1);
unsigned micBufferRead = 0;
mic_array_decimator_conf_common_t dcc;
const int * unsafe fir_coefs[7];
mic_array_frame_time_domain * unsafe current;
@@ -154,8 +161,11 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
#pragma loop unroll
for(int i = 0; i < NUM_PDM_MICS; i++)
{
c_audio <: output[i];
c_audio <: output[micBufferRead][i];
}
micBufferRead++;
if(micBufferRead == MIC_BUFFER_DEPTH)
micBufferRead = 0;
}
/* Get a new frame of mic data */
@@ -171,8 +181,11 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
#pragma loop unroll
for(int i = 0; i < NUM_PDM_MICS; i++)
{
output[i] = current->data[i][0];
output[micBufferWrite][i] = current->data[i][0];
}
micBufferWrite++;
if(micBufferWrite == MIC_BUFFER_DEPTH)
micBufferWrite = 0;
}
else
unsafe{
@@ -199,8 +212,11 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
#pragma loop unroll
for(int i = 0; i < NUM_PDM_MICS; i++)
{
output[i] = current->data[i][0];
output[micBufferWrite][i] = current->data[i][0];
}
micBufferWrite++;
if(micBufferWrite == MIC_BUFFER_DEPTH)
micBufferWrite = 0;
}
break;
} /* select */