Assss.docx

#include <xc.h> #define _XTAL_FREQ 4000000 #define cs LATA5

void spi_Initial() { TRISCbits.TRISC4 = 1;

/* RC4 configurer comme entrée (SDI) */

TRISCbits.TRISC3 = 0;

/* RC3 configurer comme sortie (SCK) */

TRISAbits.TRISA5 = 0;

/* RA5 configurer comme sortie */

TRISCbits.TRISC5 = 0;

/* RC5 configurer comme sortie (SDO) */

/*Pour initialiser la communication SPI,configurez le registre suivant */

SSPSTAT=0x42;

/* Changement de données sur le front montant de clk, BF = 0 */

SSPCON1=0x20;

/*Mode esclave, activation de la série, état de veille élevé pour clk*/

PIR1bits.SSPIF=0; ADCON1=0x0F;

/* This makes all pins as digital I/O */

cs=1; }

void spi_write(unsigned char data) { SSPBUF=data;

/*COPIE DATA DANS LE REGISTRE SSPBUF*/

}

unsigned char spi_read() { unsigned char c; c=SSPBUF; while(!PIR1bits.SSPIF)

PIR1bits.SSPIF = 0; return(c); }

unsigned char read_data_eep(unsigned long addr) { unsigned char data; cs=0; spi_write(0X03);

/*Read data from memory array beginning at selected addres*/

spi_write(addr>>16); spi_write(addr>>8); /*read address*/ spi_write((unsigned char)addr); data=spi_read();

/*read data*/

cs=1; return data; } void write_data_eep(unsigned char data,unsigned long addr) { cs=0; spi_write(0X06);

/*Set the write enable latch (enable write operations)*/

cs=1;

cs=0; /*envoyer l'adresse suivi par le message */ spi_write(0X02); /* L'instruction de l'écriture*/ spi_write(addr>>16); spi_write(addr>>8); spi_write((unsigned char)addr); spi_write(data); cs=1; }

void main(void) { unsigned char out; TRISB=0X00; spi_Initial(); cs=0; write_data_eep(03,0X0000); out=read_data_eep(0X0000); while(1); LATB=out; }