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added agc

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Andrew Stanford-Jason
2015-09-22 13:41:25 +01:00
parent 36274798ff
commit 71f55b183b
1 changed files with 16 additions and 5 deletions
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21
module_usb_audio/pcm_pdm_mic.xc
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@@ -6,7 +6,7 @@
#include <print.h> #include <print.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <xclib.h>
#include "static_constants.h" #include "static_constants.h"
#if 1 #if 1
on tile[0]: in port p_pdm_clk = XS1_PORT_1E; on tile[0]: in port p_pdm_clk = XS1_PORT_1E;
@@ -45,6 +45,8 @@ void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, s
int prev_x[7] = {0}; int prev_x[7] = {0};
int prev_y[7] = {0}; int prev_y[7] = {0};
int max = 0;
unsafe unsafe
{ {
c_ds_output_0 <: (synchronised_audio * unsafe)audio[0].data[0]; c_ds_output_0 <: (synchronised_audio * unsafe)audio[0].data[0];
@@ -66,12 +68,21 @@ void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, s
int a = dc_offset_removal( audio[buffer].data[1][0].ch_a, prev_x[0], prev_y[0]); int a = dc_offset_removal( audio[buffer].data[1][0].ch_a, prev_x[0], prev_y[0]);
int b = dc_offset_removal( audio[buffer].data[1][0].ch_b, prev_x[1], prev_y[1]); int b = dc_offset_removal( audio[buffer].data[1][0].ch_b, prev_x[1], prev_y[1]);
xscope_int(0,a); //xscope_int(0,a);
xscope_int(1,b); //xscope_int(1,b);
if((-a) > max) max = (-a);
if(a > max) max = a;
if((-b) > max) max = (-b);
if(b > max) max = b;
int output_a = a<<(clz(max)-1);
int output_b = b<<(clz(max)-1);
max = max - (max>>17);
c_pcm_out :> unsigned req; c_pcm_out :> unsigned req;
c_pcm_out <: (a>>14); c_pcm_out <: output_a;
c_pcm_out <: (b>>14); c_pcm_out <: output_b;
} }
} }
} }