forked from PAWPAW-Mirror/lib_xua
113 lines
3.1 KiB
Plaintext
113 lines
3.1 KiB
Plaintext
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#include "devicedefines.h"
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#if (NUM_PDM_MICS > 0)
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/* This file includes an example integration of lib_array_mic into USB Audio */
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#include <platform.h>
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#include <xs1.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <xclib.h>
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#include <stdint.h>
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#include "mic_array.h"
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#define MAX_DECIMATION_FACTOR 12
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/* Hardware resources */
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in port p_pdm_clk = PORT_PDM_CLK;
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in buffered port:32 p_pdm_mics = PORT_PDM_DATA;
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in port p_mclk = PORT_PDM_MCLK;
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clock pdmclk = on tile[PDM_TILE]: XS1_CLKBLK_3;
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/* User hooks */
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unsafe void user_pdm_process(mic_array_frame_time_domain * unsafe audio, int output[]);
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void user_pdm_init();
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int data_0[4*THIRD_STAGE_COEFS_PER_STAGE * MAX_DECIMATION_FACTOR] = {0};
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int data_1[4*THIRD_STAGE_COEFS_PER_STAGE * MAX_DECIMATION_FACTOR] = {0};
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mic_array_frame_time_domain mic_audio[2];
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void pdm_process(streaming chanend c_ds_output[2], chanend c_audio)
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{
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unsigned buffer = 1; // Buffer index
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int output[NUM_PDM_MICS];
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user_pdm_init();
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while(1)
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{
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unsigned samplerate;
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c_audio :> samplerate;
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unsigned decimationfactor = 96000/samplerate;
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unsafe
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{
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const int * unsafe fir_coefs[7] = {0, g_third_stage_div_2_fir, g_third_stage_div_4_fir, g_third_stage_div_6_fir, g_third_stage_div_8_fir, 0, g_third_stage_div_12_fir};
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mic_array_decimator_conf_common_t dcc = {MIC_ARRAY_MAX_FRAME_SIZE_LOG2, 1, 0, 0, decimationfactor, fir_coefs[decimationfactor/2], 0, 0, DECIMATOR_NO_FRAME_OVERLAP, 2};
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mic_array_decimator_config_t dc[2] = {{&dcc, data_0, {0, 0, 0, 0}, 4}, {&dcc, data_1, {0, 0, 0, 0}, 4}};
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mic_array_decimator_configure(c_ds_output, 2, dc);
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mic_array_init_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
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while(1)
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{
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mic_array_frame_time_domain * unsafe current = mic_array_get_next_time_domain_frame(c_ds_output, 2, buffer, mic_audio, dc);
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unsafe
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{
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int req;
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user_pdm_process(current, output);
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c_audio :> req;
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if(req)
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{
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for(int i = 0; i < NUM_PDM_MICS; i++)
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{
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c_audio <: output[i];
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}
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}
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else
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{
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break;
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}
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}
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}
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}
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}
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}
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#if MAX_FREQ > 48000
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#error MAX_FREQ > 48000 NOT CURRENTLY SUPPORTED
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#endif
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void pcm_pdm_mic(chanend c_pcm_out)
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{
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streaming chan c_4x_pdm_mic_0, c_4x_pdm_mic_1;
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streaming chan c_ds_output[2];
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/* TODO, always run mics at 3MHz */
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configure_clock_src_divide(pdmclk, p_mclk, 2);
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configure_port_clock_output(p_pdm_clk, pdmclk);
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configure_in_port(p_pdm_mics, pdmclk);
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start_clock(pdmclk);
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par
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{
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mic_array_pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, c_4x_pdm_mic_1);
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mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_0, c_ds_output[0]);
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mic_array_decimate_to_pcm_4ch(c_4x_pdm_mic_1, c_ds_output[1]);
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pdm_process(c_ds_output, c_pcm_out);
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}
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}
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#endif
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