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Second decimator core only run if NUM_PDM_MICS>4

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This commit is contained in:
Ross Owen
2016-10-06 13:43:57 +01:00
parent 1e8ea9a771
commit a6a860694c
1 changed files with 22 additions and 9 deletions
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31
module_usb_audio/pdm_mics/pdm_mic.xc
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@@ -49,6 +49,12 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
user_pdm_init();
#endif
#if NUM_PDM_MICS > 4
unsigned decimatorCount = 2;
#else
unsigned decimatorCount = 1;
#endif
mic_array_decimator_conf_common_t dcc;
const int * unsafe fir_coefs[7];
mic_array_frame_time_domain * unsafe current;
@@ -106,13 +112,13 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
dc[1].mic_gain_compensation[3]=0;
dc[1].channel_count = 4;
mic_array_decimator_configure(c_ds_output, 2, dc);
mic_array_decimator_configure(c_ds_output, decimatorCount, dc);
mic_array_init_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
mic_array_init_time_domain_frame(c_ds_output, decimatorCount, buffer, mic_audio, dc);
/* Grab a first frame of mic data */
/* Note, loop is unrolled once - allows for while(1) select {} and thus combinable */
current = mic_array_get_next_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
current = mic_array_get_next_time_domain_frame(c_ds_output, decimatorCount, buffer, mic_audio, dc);
}
/* Run user code */
@@ -141,7 +147,7 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
}
/* Get a new frame of mic data */
mic_array_frame_time_domain * unsafe current = mic_array_get_next_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
mic_array_frame_time_domain * unsafe current = mic_array_get_next_time_domain_frame(c_ds_output, decimatorCount, buffer, mic_audio, dc);
/* Run user code */
#ifdef MIC_PROCESSING_USE_INTERFACE
@@ -160,11 +166,11 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
dcc.output_decimation_factor = decimationfactor;
dcc.coefs=fir_coefs[decimationfactor/2];
dcc.fir_gain_compensation = fir_gain_compen[decimationfactor/2];
mic_array_decimator_configure(c_ds_output, 2, dc);
mic_array_init_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
mic_array_decimator_configure(c_ds_output, decimatorCount, dc);
mic_array_init_time_domain_frame(c_ds_output, decimatorCount, buffer, mic_audio, dc);
/* Get a new mic data frame */
mic_array_frame_time_domain * unsafe current = mic_array_get_next_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
mic_array_frame_time_domain * unsafe current = mic_array_get_next_time_domain_frame(c_ds_output, decimatorCount, buffer, mic_audio, dc);
/* Run user code */
#ifdef MIC_PROCESSING_USE_INTERFACE
@@ -186,14 +192,19 @@ void pdm_buffer(streaming chanend c_ds_output[2], chanend c_audio)
void pdm_mic(streaming chanend c_ds_output[2])
{
streaming chan c_4x_pdm_mic_0, c_4x_pdm_mic_1;
streaming chan c_4x_pdm_mic_0;
#if (NUM_PDM_MICS > 4)
streaming chan c_4x_pdm_mic_1;
#else
#define c_4x_pdm_mic_1 null
#endif
/* Mics expect a clock in the 3Mhz range, calculate the divide based on mclk */
/* e.g. For a 48kHz range mclk we expect a 3072000Hz mic clock */
/* e.g. For a 44.1kHz range mclk we expect a 2822400Hz mic clock */
/* Note, codebase currently does not handle a different divide for each clock */
assert((MCLK_48 % 3072000) == (MCLK_441 % 2822400));
assert((MCLK_48 / 3072000) == (MCLK_441 / 2822400));
unsigned micDiv = MCLK_48/3072000;
@@ -206,7 +217,9 @@ void pdm_mic(streaming chanend c_ds_output[2])
{
mic_array_pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, c_4x_pdm_mic_1);
mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output[0]);
#if (NUM_PDM_MICS > 4)
mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output[1]);
#endif
}
}
#endif