i2c between PIC's 16F74

[ArMo]

Hi,

I'm have some problem with my communicaton i2c between PIC16F74's...

I try to write one simple code for write/read between pic's, but my code don't read nothing.

Can someone show me where I have gone wrong? I'm a little confused.

//MASTER CODE:

#include <16F74.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //High speed Osc (> 4mhz)
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#use delay(clock=16000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#use i2c(Master,Slow,sda=PIN_C4,scl=PIN_C3)

//=============== GLOBAIS ======================
char s[]= {"- write -"};
char buffer[0x20];
char data;
int i,j;
//============================================

void led()
{
output_bit(PIN_A3,0);
delay_ms(1000);
output_bit(PIN_A3,1);
delay_ms(1000);
output_bit(PIN_A3,0);
}
void buffer()
{
if(j<25)
{
buffer[j]=data;
j++;
}
else j=0;
}

void main()
{
port_b_pullups(TRUE);
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
// TODO: USER CODE!!

while(1)
{
//================= WRITE =====================
if(!input(PIN_A0)) // write in slave
{
i2c_start(); // Begin
i2c_write(0xa0); // Control Byte (write)
i2c_write(0x20); // Address
for (i=0;i<10;i++)
{
i2c_write(s[i]); // Data (10 char's)
delay_ms(100);
}
i2c_stop(); // end
led(); // Led
}
//============= READ ===================
if(!input(PIN_A2)) // read in slave
{
i2c_start(); // begin
i2c_write(0xA0);
i2c_write(0x20);
i2c_start();
i2c_write(0xA1);
for(j=0;j<25;j++)
{
data = i2c_read();
buffer();
}
i2c_stop();
led();
}
}
}



// SLAVE CODE:

#include <16F74.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Crystal osc (>4mhz)
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#use delay(clock=16000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#use i2c(Slave,Slow,sda=PIN_C4,scl=PIN_C3,address=0xA0)

//============= GLOBAIS ==================
BYTE buffer[0x20];
char c;
int8 data;
char r[]="- Ok -";
int i=0;
int j;

//=========( BUFFER )========================
/*
void buffer()
{
if (i<25> state=0: Address match received with R/W bit clear
{
}
*/
//=========( STATE<80 )======================

if(state<0x80>1)
{
data=rx;
c=data;
putc(c);
buffer();
}

//=====( STATE=80 )=======================

if(state==0x80) // Address match received with R/W bit set
{
i2c_start();
i2c_write(0x20);
for (j=0;j<10;j++)
{
i2c_write(r[j]);
delay_ms(100);
}
i2c_stop();
}

//=====( STATE<FF )==================
/*
if(state<0xFF) //Transmission completed and acknowledged
{
}
*/
}
void main ()
{
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
while (1)
{
}
}


//--------------------------------------------------------------------

Thank you for your time.
ArMo

[PCM programmer]

[ArMo]

I do it... that's all rigth now ???

[PCM programmer]

[ArMo]

I did it ... it´s ok ?? PLEASE HELP ME

[PCM programmer]

The code is not posted OK. Look at it. Many statements are messed up.
I suggest that you give up on posting the code. Instead, try the
following:

Use the CCS example file code, Ex_Slave.c, for the Slave PIC.
It's in this directory: