Hi Folks!

I am working with the pic 16f877 and I want to request
some of you
a code source example to be able to use the protocol
I2C MSSP because
I have not been able to put it into operation.

I thank the borrowed time ahead of time.

I have made some codes but they don't work me:

void WRITEEEPROM(char DATO)
        {
        PIE1.SSPIE=0;
        SSPCON2.SEN=1;                          //Send Start Bit
        SSPBUF=SLAVE;                           //Send Adrress of device
        SSPBUF=MSW;                             //Send Word High for 24LC65
        SSPBUF=LSW;
     //Send Word Low for 24LC65
        SSPBUF=DATO;                            //Send Data to position
        SSPCON2.PEN=1;                          //Send Stop Bit
        }

char READEEPROM(char MSW,char LSW)
        {
        char DATAI;

        PIE1.SSPIE=0;
        SSPCON2.SEN=1;                          //Send Start Bit
        SSPBUF=SLAVE;                           //Send Adrress of device
        SSPBUF=MSW;
        SSPBUF=LSW;
        SSPCON2.SEN=1;                          //Send Start Bit
        SSPBUF=SLAVE | 0x01;                                //Output
SLAVE address and read option
        SSPCON2.RCEN=1;                         //Read Data of I2C port
        DATAI=SSPBUF;                           //put data in DATAI

//      SSPCON2.ACKEN=1;                                    //only if is
sequencial transfer
                                                            //should put SSPCON2
.ACKDT before
//      if(SSPCON2.ACKSTAT==1) ERROR(3);                    //Not
ACK
        SSPCON2.PEN=1;                          //Send Stop Bit
        return DATAI;
        }


void IICInit(void)
        {
        ERROR1=0;                                       //Clear error register
        STATUS.RP0=1;                           //Select page 1

//      SSPCON.SSPEN=1;                         //Enable I2C port
        SSPCON=0x3E;                            //I2C 7 bit slave mode with mast
er
        PORTC=0;                                        //Set SDA, SCL low when
not is tri-state
                                                        //mode enabled
        PIE1.SSPIE=0;                                   //desenable the interrup
tion to SSP
        SSPADD=0xA2;                            //Adrress of PIC in the protocol
        PORTC.3=1;                                      //Set SCL high
        PORTC.4=1;                                      //Set SDA high
        PIR1.SSPIF=0;                                   //Clear SSP interrupt fl
ag
        INTCON=0xC0;                                    //Enable interrupts
        SSPCON2.ACKDT=0;                                //It allows to place rec
ognition
bit

        STATUS.RP0=0;                               //Select page 0
        }

/*******************************************************************************
**********************************************************
/*******************************************************************************
**********************************************************


Ahora si en cristiano....

Hola Amigos!

Yo estoy trabajando con el pic 16f877 y quiero
solicitar a alguno de ustedes
un csdigo fuente ejemplo para poder utilizar el
protocolo I2C MSSP porque no he
podido ponerlo en funcionamiento.

yo he hecho algunos codigos pero no me funcionan:

void WRITEEEPROM(char DATO)
        {
        PIE1.SSPIE=0;
        SSPCON2.SEN=1;                          //Manda bit de arranque
        SSPBUF=SLAVE;                           //Transfiere direccion del
dispositivo esclavo
        SSPBUF=MSW;                             //Mandar palabra de direccionami
ento
para la memoria
        SSPBUF=LSW;
        SSPBUF=DATO;                            //Transfiere el dato a la Memori
a
        SSPCON2.PEN=1;                          //Manda bit de parada
        }

char READEEPROM(char MSW,char LSW)
        {
        char DATAI;

        PIE1.SSPIE=0;
        SSPCON2.SEN=1;                          //Manda bit de arranque
        SSPBUF=SLAVE;                           //Transfiere direccion del
dispositivo esclavo
        SSPBUF=MSW;
        SSPBUF=LSW;
        SSPCON2.SEN=1;                          //Manda bit de arranque
        SSPBUF=SLAVE | 0x01;                    //Output SLAVE address
        SSPCON2.RCEN=1;                         //Lee dato del puerto I2C
        DATAI=SSPBUF;                           //coloca dato en DATAI

//      SSPCON2.ACKEN=1;                        //En caso de que fuera mas de un
dato siempre
                                                //debe haber una seqal de recono
cimiento del
                                                //maestro...Pero debe colocarse
el SSPCON2.ACKDT
//      if(SSPCON2.ACKSTAT==1) ERROR(3);        //No recibio
reconocimiento
        SSPCON2.PEN=1;                          //Manda bit de parada
        return DATAI;
        }


void IICInit(void)
        {
        ERROR1=0;                                       //Clear error register
        STATUS.RP0=1;                                   //Select page 1

//      SSPCON.SSPEN=1;                                 //Habilita el puerto I2C
        SSPCON=0x3E;                                    //I2C 7 bit slave mode w
ith master
        PORTC=0;                                        //Set SDA, SCL low when
not is tri-state
                                                        //mode enabled
        PIE1.SSPIE=0;                                   //Desactiva la interrupc
ion del SSP
        SSPADD=0xA2;                                    //Direccion del PIC en e
l protocolo.
        PORTC.3=1;                                      //Set SCL high
        PORTC.4=1;                                      //Set SDA high
        PIR1.SSPIF=0;                                   //Clear SSP interrupt fl
ag
        INTCON=0xC0;                                    //Enable interrupts
        SSPCON2.ACKDT=0;                                //Permite colocar bit de
reconocimiento

        STATUS.RP0=0;                                   //Select page 0
        }

Agradezco de antemano el tiempo prestado.

Edinsson Ariza.


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