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PDM/Mic code can now handle rate changes.

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This commit is contained in:
Ross Owen
2015-11-11 14:10:21 +00:00
parent b5c0ddaaf8
commit ee40514079
2 changed files with 55 additions and 33 deletions
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74
module_usb_audio/pdm_mics/pcm_pdm_mic.xc
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@@ -8,7 +8,6 @@
#include <platform.h>
#include <xs1.h>
#include <stdlib.h>
#include <print.h>
#include <stdio.h>
#include <string.h>
#include <xclib.h>
@@ -17,8 +16,6 @@
#include "fir_decimator.h"
#include "mic_array.h"
#define DF 1
/* Hardware resources */
in port p_pdm_clk = PORT_PDM_CLK;
in buffered port:32 p_pdm_mics = PORT_PDM_DATA;
@@ -29,8 +26,8 @@ clock pdmclk = on tile[PDM_TILE]: XS1_CLKBLK_3;
unsafe void user_pdm_process(frame_audio * unsafe audio, int output[]);
void user_pdm_init();
int data_0[4*COEFS_PER_PHASE*DF] = {0};
int data_1[4*COEFS_PER_PHASE*DF] = {0};
int data_0[4*COEFS_PER_PHASE*MAX_DECIMATION_FACTOR] = {0};
int data_1[4*COEFS_PER_PHASE*MAX_DECIMATION_FACTOR] = {0};
void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, chanend c_audio)
{
@@ -40,38 +37,53 @@ void pdm_process(streaming chanend c_ds_output_0, streaming chanend c_ds_output_
int output[NUM_PDM_MICS];
user_pdm_init();
unsigned decimation_factor=DF;
unsafe
{
decimator_config_common dcc = {FRAME_SIZE_LOG2, 1, 0, 0, decimation_factor, fir_coefs[decimation_factor], 0};
decimator_config dc0 = {&dcc, data_0, {0, 0, 0, 0}};
decimator_config dc1 = {&dcc, data_1, {0, 0, 0, 0}};
decimator_configure(c_ds_output_0, c_ds_output_1, dc0, dc1);
}
decimator_init_audio_frame(c_ds_output_0, c_ds_output_1, buffer, audio);
while(1)
{
frame_audio * unsafe current = decimator_get_next_audio_frame(c_ds_output_0, c_ds_output_1, buffer, audio);
{
unsigned samplerate;
c_audio :> samplerate;
unsigned decimationfactor = 48000/samplerate;
unsafe
{
user_pdm_process(current, output);
for(int i = 0; i < NUM_PDM_MICS; i++)
{
c_audio <: output[i];
}
decimator_config_common dcc = {FRAME_SIZE_LOG2, 1, 0, 0, decimationfactor, fir_coefs[decimationfactor], 0};
decimator_config dc0 = {&dcc, data_0, {0, 0, 0, 0}};
decimator_config dc1 = {&dcc, data_1, {0, 0, 0, 0}};
decimator_configure(c_ds_output_0, c_ds_output_1, dc0, dc1);
}
decimator_init_audio_frame(c_ds_output_0, c_ds_output_1, buffer, audio);
while(1)
{
frame_audio * unsafe current = decimator_get_next_audio_frame(c_ds_output_0, c_ds_output_1, buffer, audio);
unsafe
{
int req;
user_pdm_process(current, output);
c_audio :> req;
if(req)
{
for(int i = 0; i < NUM_PDM_MICS; i++)
{
c_audio <: output[i];
}
}
else
{
break;
}
}
}
}
}
#if MAX_FREQ != 48000
#error NOT CURRENTLY SUPPORTED
#endif
#if MIN_FREQ != 48000
#if MAX_FREQ > 48000
#error NOT CURRENTLY SUPPORTED
#endif
@@ -80,13 +92,13 @@ void pcm_pdm_mic(chanend c_pcm_out)
streaming chan c_multi_channel_pdm, c_sync, c_4x_pdm_mic_0, c_4x_pdm_mic_1;
streaming chan c_ds_output_0, c_ds_output_1;
streaming chan c_buffer_mic0, c_buffer_mic1;
/* TODO, always run mics at 3MHz */
configure_clock_src_divide(pdmclk, p_mclk, 2);
configure_port_clock_output(p_pdm_clk, pdmclk);
configure_in_port(p_pdm_mics, pdmclk);
start_clock(pdmclk);
par
{
pdm_rx(p_pdm_mics, c_4x_pdm_mic_0, c_4x_pdm_mic_1);