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audio scaling for pdm

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Andrew Stanford-Jason
2015-09-22 12:21:33 +01:00
parent 5adfd29c17
commit 35834c4fb8
3 changed files with 1006 additions and 506 deletions
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1327
module_usb_audio/.cproject
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160
module_usb_audio/.project
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@@ -1,76 +1,90 @@
<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<projectDescription> <projectDescription>
<name>module_usb_audio</name> <name>module_usb_audio</name>
<comment></comment> <comment></comment>
<projects> <projects>
</projects> </projects>
<buildSpec> <buildSpec>
<buildCommand> <buildCommand>
<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name> <name>com.xmos.cdt.core.LegacyProjectCheckerBuilder</name>
<triggers>clean,full,incremental,</triggers> <arguments>
<arguments> </arguments>
<dictionary> </buildCommand>
<key>?children?</key> <buildCommand>
<value>?name?=outputEntries\|?children?=?name?=entry\\\\|\\|\||</value> <name>com.xmos.cdt.core.ProjectInfoSyncBuilder</name>
</dictionary> <arguments>
<dictionary> </arguments>
<key>?name?</key> </buildCommand>
<value></value> <buildCommand>
</dictionary> <name>com.xmos.cdt.core.ModulePathBuilder</name>
<dictionary> <arguments>
<key>org.eclipse.cdt.make.core.append_environment</key> </arguments>
<value>true</value> </buildCommand>
</dictionary> <buildCommand>
<dictionary> <name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
<key>org.eclipse.cdt.make.core.buildArguments</key> <triggers>clean,full,incremental,</triggers>
<value>CONFIG=Debug</value> <arguments>
</dictionary> <dictionary>
<dictionary> <key>?children?</key>
<key>org.eclipse.cdt.make.core.buildCommand</key> <value>?name?=outputEntries\|?children?=?name?=entry\\\\|\\|\||</value>
<value>xmake</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>?name?</key>
<key>org.eclipse.cdt.make.core.cleanBuildTarget</key> <value></value>
<value>clean</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.append_environment</key>
<key>org.eclipse.cdt.make.core.contents</key> <value>true</value>
<value>org.eclipse.cdt.make.core.activeConfigSettings</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.buildArguments</key>
<key>org.eclipse.cdt.make.core.enableAutoBuild</key> <value>CONFIG=Debug</value>
<value>false</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.buildCommand</key>
<key>org.eclipse.cdt.make.core.enableCleanBuild</key> <value>xmake</value>
<value>true</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.cleanBuildTarget</key>
<key>org.eclipse.cdt.make.core.enableFullBuild</key> <value>clean</value>
<value>true</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.contents</key>
<key>org.eclipse.cdt.make.core.stopOnError</key> <value>org.eclipse.cdt.make.core.activeConfigSettings</value>
<value>true</value> </dictionary>
</dictionary> <dictionary>
<dictionary> <key>org.eclipse.cdt.make.core.enableAutoBuild</key>
<key>org.eclipse.cdt.make.core.useDefaultBuildCmd</key> <value>false</value>
<value>false</value> </dictionary>
</dictionary> <dictionary>
</arguments> <key>org.eclipse.cdt.make.core.enableCleanBuild</key>
</buildCommand> <value>true</value>
<buildCommand> </dictionary>
<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name> <dictionary>
<triggers>full,incremental,</triggers> <key>org.eclipse.cdt.make.core.enableFullBuild</key>
<arguments> <value>true</value>
</arguments> </dictionary>
</buildCommand> <dictionary>
</buildSpec> <key>org.eclipse.cdt.make.core.stopOnError</key>
<natures> <value>true</value>
<nature>org.eclipse.cdt.core.cnature</nature> </dictionary>
<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature> <dictionary>
<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature> <key>org.eclipse.cdt.make.core.useDefaultBuildCmd</key>
<nature>com.xmos.cdt.core.XdeProjectNature</nature> <value>false</value>
</natures> </dictionary>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
<triggers>full,incremental,</triggers>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.cdt.core.cnature</nature>
<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
<nature>com.xmos.cdt.core.XdeProjectNature</nature>
</natures>
</projectDescription> </projectDescription>

25
module_usb_audio/pcm_pdm_mic.xc
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@@ -27,6 +27,13 @@ typedef struct {
} synchronised_audio; } synchronised_audio;
static int dc_offset_removal(int sample, int &prex_x, int &prev_y){
int r = prev_y- (prev_y>>5) + (sample - prex_x);
prex_x = sample;
prev_y = r;
return r;
}
void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, streaming chanend c_pcm_out) void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, streaming chanend c_pcm_out)
{ {
@@ -35,6 +42,8 @@ void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, s
synchronised_audio audio[2]; //double buffered synchronised_audio audio[2]; //double buffered
memset(audio, sizeof(synchronised_audio), 2); memset(audio, sizeof(synchronised_audio), 2);
int prev_x[7] = {0};
int prev_y[7] = {0};
unsafe unsafe
{ {
@@ -52,15 +61,17 @@ void example(streaming chanend c_ds_output_0, streaming chanend c_ds_output_1, s
buffer = 1 - buffer; buffer = 1 - buffer;
//The data has already been bit reversed in the downsampler
// audio[buffer] is good to go // audio[buffer] is good to go
//xscope_int(0, audio[buffer].data[0][0].ch_a);
//xscope_int(1, audio[buffer].data[0][0].ch_b); 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]);
xscope_int(0,a);
xscope_int(1,b);
c_pcm_out :> unsigned req; c_pcm_out :> unsigned req;
c_pcm_out <: audio[buffer].data[0][0].ch_a; c_pcm_out <: (a>>14);
c_pcm_out <: audio[buffer].data[0][0].ch_b; c_pcm_out <: (b>>14);
//printintln(audio[buffer].data[0][0].ch_b);
} }
} }
} }