110 lines
3.7 KiB
Plaintext
110 lines
3.7 KiB
Plaintext
#include "xua.h"
|
|
#if (XUA_NUM_PDM_MICS > 0)
|
|
|
|
#include <platform.h>
|
|
#include <xs1.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <xclib.h>
|
|
#include <stdint.h>
|
|
#include <assert.h>
|
|
|
|
#include "mic_array.h"
|
|
|
|
|
|
void mic_array_decimator_set_samprate(const unsigned samplerate, int mic_decimator_fir_data_array[], mic_array_decimator_conf_common_t *dcc, mic_array_decimator_config_t dc[])
|
|
{
|
|
unsigned decimationfactor = 96000/samplerate;
|
|
int fir_gain_compen[7];
|
|
int * unsafe fir_coefs[7];
|
|
unsafe
|
|
{
|
|
fir_gain_compen[0] = 0;
|
|
fir_gain_compen[1] = FIR_COMPENSATOR_DIV_2; //48kHz
|
|
fir_gain_compen[2] = FIR_COMPENSATOR_DIV_4;
|
|
fir_gain_compen[3] = FIR_COMPENSATOR_DIV_6; //16kHz
|
|
fir_gain_compen[4] = FIR_COMPENSATOR_DIV_8;
|
|
fir_gain_compen[5] = 0;
|
|
fir_gain_compen[6] = FIR_COMPENSATOR_DIV_12;
|
|
|
|
fir_coefs[0] = 0;
|
|
fir_coefs[1] = (int * unsafe)g_third_stage_div_2_fir;
|
|
fir_coefs[2] = (int * unsafe)g_third_stage_div_4_fir;
|
|
fir_coefs[3] = (int * unsafe)g_third_stage_div_6_fir;
|
|
fir_coefs[4] = (int * unsafe)g_third_stage_div_8_fir;
|
|
fir_coefs[5] = 0;
|
|
fir_coefs[6] = (int * unsafe)g_third_stage_div_12_fir;
|
|
|
|
//dcc = {MIC_ARRAY_MAX_FRAME_SIZE_LOG2, 1, 0, 0, decimationfactor, fir_coefs[decimationfactor/2], 0, 0, DECIMATOR_NO_FRAME_OVERLAP, 2};
|
|
dcc->frame_size_log2 = MIC_ARRAY_MAX_FRAME_SIZE_LOG2;
|
|
dcc->apply_dc_offset_removal = 1;
|
|
dcc->index_bit_reversal = 0;
|
|
dcc->windowing_function = null;
|
|
dcc->output_decimation_factor = decimationfactor;
|
|
dcc->coefs = fir_coefs[decimationfactor/2];
|
|
dcc->apply_mic_gain_compensation = 0;
|
|
dcc->fir_gain_compensation = fir_gain_compen[decimationfactor/2];
|
|
dcc->buffering_type = DECIMATOR_NO_FRAME_OVERLAP;
|
|
dcc->number_of_frame_buffers = 2;
|
|
|
|
//dc[0] = {&dcc, mic_decimator_fir_data[0], {0, 0, 0, 0}, 4};
|
|
dc[0].dcc = dcc;
|
|
dc[0].data = mic_decimator_fir_data_array;
|
|
dc[0].mic_gain_compensation[0]=0;
|
|
dc[0].mic_gain_compensation[1]=0;
|
|
dc[0].mic_gain_compensation[2]=0;
|
|
dc[0].mic_gain_compensation[3]=0;
|
|
dc[0].channel_count = 4;
|
|
}
|
|
}
|
|
|
|
#if MAX_FREQ > 48000
|
|
#error MAX_FREQ > 48000 NOT CURRENTLY SUPPORTED
|
|
#endif
|
|
|
|
void pdm_mic(streaming chanend c_ds_output, in buffered port:32 p_pdm_mics)
|
|
{
|
|
streaming chan c_4x_pdm_mic_0;
|
|
assert((MCLK_48 / 3072000) == (MCLK_441 / 2822400)); //Make sure mic clock is achievable from MCLK
|
|
par
|
|
{
|
|
mic_array_pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, null);
|
|
mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output, MIC_ARRAY_NO_INTERNAL_CHANS);
|
|
|
|
}
|
|
}
|
|
|
|
void mic_array_setup_ddr_xcore(clock pdmclk,
|
|
clock pdmclk6,
|
|
out port p_pdm_clk,
|
|
buffered in port:32 p_pdm_data,
|
|
int divide) {
|
|
configure_clock_xcore(pdmclk, 80);
|
|
//configure_clock_src_divide(pdmclk, p_mclk, divide/2);
|
|
|
|
configure_clock_xcore(pdmclk6, 40);
|
|
//configure_clock_src_divide(pdmclk6, p_mclk, divide/4);
|
|
|
|
configure_port_clock_output(p_pdm_clk, pdmclk);
|
|
configure_in_port(p_pdm_data, pdmclk6);
|
|
|
|
/* start the faster capture clock */
|
|
start_clock(pdmclk6);
|
|
/* wait for a rising edge on the capture clock */
|
|
partin(p_pdm_data, 4);
|
|
/* start the slower output clock */
|
|
start_clock(pdmclk);
|
|
|
|
/*
|
|
* this results in the rising edge of the capture clock
|
|
* leading the rising edge of the output clock by one period
|
|
* of p_mclk, which is about 40.7 ns for the typical frequency
|
|
* of 24.576 megahertz.
|
|
* This should fall within the data valid window.
|
|
*/
|
|
|
|
}
|
|
|
|
#endif
|