Sampling an 8 bit WAV file with a PIC

[Spiffy]

Hey! spam -- ignore this post to all the interestee`!


How would I sample a 8 bit audio WAV file through my PIC and have good sound fidelity?
heres what I cam up with:

#include "16f877.h"
#include "stdlib.h"
#use delay (clock=4000000)
#use rs232 (baud=9600,xmit=pin_c6,rcv=pin_c7)
#bit CKE = 0x94.6
#bit SMP = 0x94.7
#bit CKP = 0x14.4
#byte SSPSTAT=0x94
#byte SSPCON=0x14
#bit ADFM=0x9f.7

//D�claration des variables


char choix;
int data=0,yx,res2;
long int i=0,resultat;

void son (void);
void ecriture (void);
void lecture (void);
void conversion (void);
void main (void)

{

set_tris_C(0x90); //configure les ports pour sortie et entree.
set_tris_A(0xff);
set_tris_E(0x04);
setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_internal);
ADFM=1;
setup_spi(spi_master|spi_l_to_h|spi_clk_div_4);

CKE = 1; // donn�e VALIDE de front descendant � front descendant
CKP = 0; // La m�moire �chantillone sur front montant
SMP = 0; // �chantillonage au centre d'un cr�neau
while(1)
{


i=0;
Printf("\n\r 1-Pour faire une simple ecriture");
Printf("\n\r 2-Pour faire une lecture");
Printf("\n\r 3-Pour faire une conversion AD");
Printf("\n\r 4-Pour faire jouer un son");
choix=getch();


if (choix=='1')

{
ecriture();
}

if (choix=='2')
{
lecture();
}
if (choix=='3')
{
conversion();
}
if (choix=='4')
{
son();
}
else
{
puts("\n\r Erreur");
}
}


}

void ecriture (void)
{


printf("\n\r appuyer sur UN chiffre:");
yx=getch();
printf("\n\rlecture:%d",yx);
getch();


output_low(pin_a4); //On choisi la memoire
spi_write(0x06); //Write enable
output_high(pin_a4);

output_low(pin_a4);
spi_write(0x02); //on veut ecrire sur la memoire
spi_write(0x00); //On choisi l'adress 1
spi_write(0x00); //On choisi l'adress 2

While(i<70)
{
spi_write(yx); //On designe le data a envoyer
i++;
}

output_high(pin_a4); //On enleve la selection de memoire
printf("\n\r ok!");

}

void lecture (void)

{
printf("\n\r SSPSTAT:%x",SSPSTAT);
printf("\n\r SSPSTAT:%x",SSPCON);



printf("\n\rReading...");
output_low(pin_a4);
spi_write(0x03);
spi_write(0x00);
spi_write(0x00);


While(i<80)
{
data=spi_read(0);
printf("\n\rlecture: %lu %x",i,data);
i++;
}
output_high(pin_a4);

}
void conversion (void)
{

set_adc_channel(2);


output_low(pin_a4); //On choisi la memoire
spi_write(0x06); //Write enable
output_high(pin_a4);

output_low(pin_a4);
spi_write(0x02); //on veut ecrire sur la memoire
spi_write(0x00); //On choisi l'adress 1
spi_write(0x00); //On choisi l'adress 2

While(i<60)
{
resultat=read_adc();

res2=(int)(resultat/4);
spi_write(res2); //On designe le data a envoyer
i++;
puts("valeur entree");
}
output_high(pin_a4);
}

void son (void)

{
output_low(pin_a5);
output_low(pin_a4);
spi_write(0x03);
spi_write(0x00);
spi_write(0x00);


While(i<80)
{
data=spi_read(0);
printf("\n\rlecture: %lu %x",i,data);
i++;
}
output_high(pin_a4);
output_high(pin_a5);
}

The main idea here is I want to sample the sound and and write to a EEPROM memory so I could reuse this sound later on and convert it with a CDA converter.

And also which CDA ( digital to analog convertor) is suitable for this task I have a MAX522 do you any idea if its good or not?

[Neutone]

There has been some post on a 1bit audio solution that works very well.

[Guest]