reading audio using mcp3008 - Raspberry Pi Forums

hello everyone,

trying read audio data microphone through mcp3008 doesn't seem work. have tested code potentiometer , working fine. when play 1 khz tone , not seem capture data microphone.
new raspberry pi, please help.

code using posted below:

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include <stdlib.h>
#include <wiringpi.h>
#include <wiringpispi.h>
#include <wiringserial.h>

#define cs_mcp3202 8 // bcm_gpio8 //pi24

#define spi_channel 0
#define spi_speed 200000 // !! start low here , if works try increase if needed on breadboard go upto 750000
#define pi 3.1416

#define spi_speed 11 // bcm_gpio8

int read_mcp3202_adc(unsigned char adcchannel)
{
unsigned char buff[3];
int adcvalue = 0;

wiringpispisetup(0, spi_speed);

buff[0] = 0x01;
buff[1]=0x00 | adcchannel;
buff[2] = 0x00;

digitalwrite(cs_mcp3202, 0); // low : cs active
usleep(0.10);

wiringpispidatarw(spi_channel, buff, 3);

buff[1] = 0x0f & buff[1];
adcvalue = ( buff[1] << 8) | buff[2];

digitalwrite(cs_mcp3202, 1); // high : cs inactive
usleep(0.27);
return adcvalue;
}


int main (void)
{
float x[360];
unsigned char adc1channel = 0x80;;
int adc1value = 0;
int i;

if(wiringpisetup() == -1)
{
fprintf (stdout, "unable start wiringpi: %s\n", strerror(errno));
return 1 ;
}

if(wiringpispisetup(spi_channel, spi_speed) == -1)
{
fprintf (stdout, "wiringpispisetup failed: %s\n", strerror(errno));
return 1 ;
}

pinmode(cs_mcp3202, output);

for(i=0 ; i<360;i++)
{
// w= (i*pi/180);
// t = (2*pi)/w;
system("clear");
//printf("\n\nmcp3202 channel output.\n\n");
adc1value = read_mcp3202_adc(adc1channel);
//printf("adc0 value = %04u", adc1value);
//printf("\tvoltage = %.3f\n", ((3.3/1024) * adc1value));
x= ((3.3/1024)*adc1value);

usleep(1);
}

for(i=1;i<360;i++)
{
printf("%f \n ",x);
}

return 0;
}

code compiled , csv file made analyze recorded data. since csv file not being attatched, going post data it in nxt post.

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