XCore Exchange

Code: Select all

int main ( void )
{

   long A=0x7e66;
   long buf[3]={0,0x1209,0};
   int val;

    while(1)
    {

            buf[ 0 ] = ((A * buf[ 1 ]) >> 14 ) - buf[ 2 ];
            buf[ 2 ] = buf[ 1 ];
            buf[ 1 ] = buf[ 0 ];

            val = 128 + (buf[ 0 ] >> 8);

   }
}

Code: Select all

#include <platform.h>
#include <xs1.h>
#include "pwm.h"
#include <xscope.h>

#define SAMPLE_RATE 44100

on stdcore[0]: port audio = XS1_PORT_1A;

long A=0x7e66;
long buf[3]={0,0x1209,0};
int val;


void xscope_user_init( void )
{
    xscope_register( 1
        ,XSCOPE_CONTINUOUS ,"signal" ,XSCOPE_INT ,"n");
}

int main ( void )
{

    chan c_pwm;

    while(1)
    {

            buf[ 0 ] = ((A * buf[ 1 ]) >> 14 ) - buf[ 2 ];
            buf[ 2 ] = buf[ 1 ];
            buf[ 1 ] = buf[ 0 ];

            val = 32768+buf[ 0 ];

            xscope_int(0, val);

            c_pwm <: val;

            pwm_server(c_pwm, audio, SAMPLE_RATE);

            delay_microseconds (10);

    }

    return 0;
}

Code: Select all

void sine (chanend pwm){
    while(1)
    {
            buf[ 0 ] = ((A * buf[ 1 ]) >> 14 ) - buf[ 2 ];
            buf[ 2 ] = buf[ 1 ];
            buf[ 1 ] = buf[ 0 ];

            val = 32768+buf[ 0 ];

            xscope_int(0, val);

            c_pwm <: val;

            delay_microseconds (10);
    }
}

Code: Select all

void main(void) {
  chan pwm;

  par {
    sine(pwm);
    pwm_server(pwm, audio, SAMPLE_RATE);
  }
}