/*
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/*
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Converts PWM output from 1942.v to .log file
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Converts PWM output from 1942.v to .log file
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the output can be piped into log2wav in order to get the wav file
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the output can be piped into log2wav in order to get the wav file
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(c) Jose Tejada Gomez, 9th May 2013
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(c) Jose Tejada Gomez, 9th May 2013
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You can use this file following the GNU GENERAL PUBLIC LICENSE version 3
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You can use this file following the GNU GENERAL PUBLIC LICENSE version 3
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Read the details of the license in:
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Read the details of the license in:
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http://www.gnu.org/licenses/gpl.txt
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http://www.gnu.org/licenses/gpl.txt
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Send comments to: jose.tejada@ieee.org
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Send comments to: jose.tejada@ieee.org
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*/
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*/
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// Compile with g++ pwm2wav.cc -o pwm2wav
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// Compile with g++ pwm2wav.cc -o pwm2wav
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#include <iostream>
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#include <iostream>
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#include <string.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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using namespace std;
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using namespace std;
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struct ym_output {
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struct ym_output {
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double a,b,c;
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double a,b,c;
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};
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};
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void parse( char *buf, int len, double pwm[6] ) {
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void parse( char *buf, int len, double pwm[6] ) {
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int k=0;
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int k=0;
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buf=strtok( buf, ",");
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buf=strtok( buf, ",");
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for( k=0; k<6; k++ ) {
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for( k=0; k<6; k++ ) {
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if( buf==NULL ) throw "incomplete line (1)";
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if( buf==NULL ) throw "incomplete line (1)";
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pwm[k] = (double)atoi( buf );
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pwm[k] = (double)atoi( buf );
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if( pwm[k]!=0 && pwm[k]!=1 ) pwm[k]=0;
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if( pwm[k]!=0 && pwm[k]!=1 ) pwm[k]=0;
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buf=strtok( NULL, " ");
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buf=strtok( NULL, " ");
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}
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}
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}
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}
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void calc_voltage( double& vcap, double pwm[3] ) {
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void calc_voltage( double& vcap, double pwm[3] ) {
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const double res = 7.23;
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const double res = 7.23;
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const double cap = 4e-6; // if RC=7.23 us => f0=22kHz
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const double cap = 4e-6; // if RC=7.23 us => f0=22kHz
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double dv=0;
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double dv=0;
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const double dt = 20e-9;
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const double dt = 20e-9;
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for(int k=0; k<3; k++ )
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for(int k=0; k<3; k++ )
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dv += pwm[k] - vcap;
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dv += pwm[k] - vcap;
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vcap += dv*dt/res/cap;
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vcap += dv*dt/res/cap;
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}
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}
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int main( int argc, char *argv[] ) {
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int main( int argc, char *argv[] ) {
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double vcap_left=0, vcap_right=0;
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double vcap_left=0, vcap_right=0;
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char buf[1024];
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char buf[1024];
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int skip = 1; // lines to skip
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int skip = 1; // lines to skip
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for(int k=0; k<skip; k++ )
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for(int k=0; k<skip; k++ )
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cin.getline( buf, sizeof(buf) );
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cin.getline( buf, sizeof(buf) );
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// conversion
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// conversion
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try {
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try {
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long int sample=0;
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long int sample=0;
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// skip first line
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// skip first line
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buf[0]=0;
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while( strncmp("1942 START",buf, 11 ) && !cin.eof() && !cin.fail() )
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cin.getline( buf, sizeof(buf) );
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cin.getline( buf, sizeof(buf) );
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cin.getline( buf, sizeof(buf) );
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cin.getline( buf, sizeof(buf) );
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while( buf[0] && !cin.eof() ) {
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while( buf[0] && !cin.eof() ) {
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double pwm[6];
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double pwm[6];
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parse( buf, sizeof(buf), pwm );
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parse( buf, sizeof(buf), pwm );
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calc_voltage( vcap_left, pwm );
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calc_voltage( vcap_left, pwm );
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calc_voltage( vcap_right, &pwm[3] );
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calc_voltage( vcap_right, &pwm[3] );
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if( sample == 1134 ) {
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if( sample == 1134 ) {
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cout << (int)(vcap_left*65535) << "\n";
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cout << (int)(vcap_left*65535) << "\n";
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cout << (int)(vcap_right*65535) << "\n";
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cout << (int)(vcap_right*65535) << "\n";
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sample = 0;
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sample = 0;
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} else sample++;
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} else sample++;
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cin.getline( buf, sizeof(buf) );
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cin.getline( buf, sizeof(buf) );
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}
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}
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return 0;
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return 0;
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}
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}
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catch( const char *x ) {
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catch( const char *x ) {
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cout << "ERROR: " << x << "\n";
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cout << "ERROR: " << x << "\n";
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return -1;
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return -1;
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}
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}
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}
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}
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