16F88 Master & Slave Mode

[Joan]

I've adapted these codes from a 16F877 to a 16F88 with internal oscillator at 8 MHz. The Idea is to transmit data with I2C protocol between two 16F88 and a PCF8574 I/O Expander. The I/O works fine but the 16F88 in Slave mode doesn't works. Anybody knows why?

Thanx in advance.

Joan.

-------------------------------------------------------------------------------

For Master:

/* Standard Include for 16F88 Chip */
#include <16F88.h>
#byte OSCCON = 0x8F
#fuses NOWDT,NOPROTECT,NOLVP, NOMCLR, INTRC_IO

/* Delay for 8 mhz crystal */
#use delay (clock=8000000)

/* Setup RS232 */
#use RS232(baud=9600, xmit=PIN_A4,rcv=PIN_A5, INVERT)

/* Setup I2C */
#use I2C(MASTER, SDA=PIN_B1, SCL=PIN_B4, SLOW)

#define LED PIN_A1

main()
{
int8 i2c_command = 66;
int dato;
dato=0b10000000;
OSCCON = 0x7C;

while (true)
{

delay_ms(1000);
printf("Outputting: %c", i2c_command);

/* Master */
i2c_start(); // Start condition
i2c_write(0xa0); // Device address
i2c_write(i2c_command); // Write Command
i2c_stop(); // Stop condition

delay_ms (125);

//i2c_start(); // Condición de inicio en el bus I2C
//i2c_write(0b01110000); // Dirección (modo escritura) del dispositivo PCF8574
//rotate_right( &dato, 1);
//i2c_write(dato); // Se envía el dato al PCF8574
//i2c_stop(); // Condición de stop

output_high(LED);
delay_ms(100);
output_low(LED);
delay_ms(100);
output_high(LED);
delay_ms(100);
output_low(LED);
delay_ms(100);

}
}

-------------------------------------------------------------------------------

For Slave:


/* Standard Include for 16F88 Chip */
#include <16F88.h>
#byte OSCCON = 0x8F
#fuses NOWDT,NOPROTECT,NOLVP, NOMCLR, INTRC_IO

/* Delay for 8 mhz crystal */
#use delay (clock=8000000)

/* Setup RS232 */
#use RS232(baud=9600, xmit=PIN_A4,rcv=PIN_A5, INVERT)

/* Setup I2C */
#use I2C(SLAVE, SDA=PIN_B1, SCL=PIN_B4, address=0xa0, SLOW)

#define LED PIN_A1

#INT_SSP
void ssp_interupt ()
{
byte incoming;
incoming = i2c_read();
incoming = i2c_read();

output_high(LED);
delay_ms(1);
output_low(LED);
delay_ms(1);

}


main()
{
OSCCON = 0x7C;

delay_ms(500);
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);



while (true)
{

}
}

-------------------------------------------------------------------------------

[ben500]

It seams to have a lot of people who have that kind of problem: the slave does not acknowledge received bytes! Nobody knows the solution?
Is possible that it comes from compatibility between PICs or oscillator frequency or fuses or ...? I'm a newbie in pic programming so I can not see from where it could come from. Can someone help, please?
THANKS!