multi slave in I2C bus

" If you have both devices on the same bus, you will have to use 100KHz for everything."

So kind of your regular and a quick response.

Yes, As per the specification i bring the clock rate from 400 kHz to 100 kHz by setting the appropriate value in SSPADDR register, the slave doesn't acknowledge to the slave address. I'm am putting I2C_READ module with the initialization. Please verify where the mistake may be.

/*

I2C CLOCK RATE W/BRG
---------------------
FCY FCY*2 BRG VALUE FSCL (2 rollovers of BRG)
--------------------------------------------------------------
10 MHz 20 MHz 19h 400 kHz(1)
10 MHz 20 MHz 20h 312.5 kHz
10 MHz 20 MHz 3Fh 100 kHz
4 MHz 8 MHz 0Ah 400 kHz(1)
4 MHz 8 MHz 0Dh 308 kHz
4 MHz 8 MHz 28h 100 kHz
1 MHz 2 MHz 03h 333 kHz(1)
1 MHz 2 MHz 0Ah 100 kHz
1 MHz 2 MHz 00h 1 MHz(1)

Note 1: The I2C interface does not conform to the 400 kHz I2C specification (which applies to rates greater than
100 kHz) in all details, but may be used with care where higher rates are required by the application.
*/

void i2c_init(void)
{ TRISC3=1; TRISC4=1;

SSPCON=0x28; SSPCON2=00; SSPADD=0x28;
}

unsigned char DS1307_READ(unsigned char addr) // addr=0x03
{ unsigned char read_data; start(); write(0xd0); //while(!ACKSTAT){} // test here whether acknowledged: it hangs up here. write(addr); restart(); write(0xd1); check_idle(); RCEN=1; check_idle(); read_data= SSPBUF; check_idle(); ACKDT=1; ACKEN=1; stop(); return read_data;
}

" If you have both devices on the same bus, you will have to use 100KHz for everything."

So kind of your regular and a quick response.

Yes, As per the specification i bring the clock rate from 400 kHz to 100 kHz by setting the appropriate value in SSPADDR register, the slave doesn't acknowledge to the slave address. I'm am putting I2C_READ module with the initialization. Please verify where the mistake may be.

/*

I2C CLOCK RATE W/BRG
---------------------
FCY FCY*2 BRG VALUE FSCL (2 rollovers of BRG)
--------------------------------------------------------------
10 MHz 20 MHz 19h 400 kHz(1)
10 MHz 20 MHz 20h 312.5 kHz
10 MHz 20 MHz 3Fh 100 kHz
4 MHz 8 MHz 0Ah 400 kHz(1)
4 MHz 8 MHz 0Dh 308 kHz
4 MHz 8 MHz 28h 100 kHz
1 MHz 2 MHz 03h 333 kHz(1)
1 MHz 2 MHz 0Ah 100 kHz
1 MHz 2 MHz 00h 1 MHz(1)

Note 1: The I2C interface does not conform to the 400 kHz I2C specification (which applies to rates greater than
100 kHz) in all details, but may be used with care where higher rates are required by the application.
*/

void i2c_init(void)
{ TRISC3=1; TRISC4=1;

SSPCON=0x28; SSPCON2=00; SSPADD=0x28;
}

unsigned char DS1307_READ(unsigned char addr) // addr=0x03
{ unsigned char read_data; start(); write(0xd0); //while(!ACKSTAT){} // test here whether acknowledged: it hangs up here. write(addr); restart(); write(0xd1); check_idle(); RCEN=1; check_idle(); read_data= SSPBUF; check_idle(); ACKDT=1; ACKEN=1; stop(); return read_data;
}

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