I2c with 16f873 & 16f73

[balamagesh]

I am trying use Hardware I2c with 16F873 as master and 16F73 as slave but my code is not working. i have connected SCL & SDA pin of both the MCU's and also have 1K pull-up resistors in these pins. But my below code is not working. so can anyone point where i am making mistake

Thanks in Advance

SLAVE CODE

#include <16f73.h>
#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT
#USE DELAY(CLOCK=4000000)
#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0x10,FORCE_HW)
#byte portb=6

main()
{
byte data;
set_tris_b(0X00);
portb=0X00;
i2c_write(0x10); // slave address
data=i2c_read(); // read data
i2c_stop();
portb=data; // moving data to portb
delay_ms(1000);
}

MASTER CODE

#include <16f873.h>
#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT,NOLVP,NOCPD,NOWRT
#USE DELAY(CLOCK=4000000)
#use i2c(master,SCL=PIN_C3,SDA=PIN_C4)
main()
{
i2c_start();
i2c_write(0x10); //address of slave
i2c_write(0x44); //data to slave
i2c_stop();
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 12603

[Tomi]

Your slave code is incorrect. See the "ex_slave.c" for a correct I2C slave code.
Additionally, your master goes to sleep after i2c_stop(). Insert a while(1) cycle just after the stop call.

:=I am trying use Hardware I2c with 16F873 as master and 16F73 as slave but my code is not working. i have connected SCL & SDA pin of both the MCU's and also have 1K pull-up resistors in these pins. But my below code is not working. so can anyone point where i am making mistake
:=
:=Thanks in Advance
:=
:=SLAVE CODE
:=
:=#include <16f73.h>
:=#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT
:=#USE DELAY(CLOCK=4000000)
:=#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0x10,FORCE_HW)
:=#byte portb=6
:=
:=main()
:={
:= byte data;
:= set_tris_b(0X00);
:= portb=0X00;
:= i2c_write(0x10); // slave address
:= data=i2c_read(); // read data
:= i2c_stop();
:= portb=data; // moving data to portb
:= delay_ms(1000);
:=}
:=
:=MASTER CODE
:=
:=#include <16f873.h>
:=#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT,NOLVP,NOCPD,NOWRT
:=#USE DELAY(CLOCK=4000000)
:=#use i2c(master,SCL=PIN_C3,SDA=PIN_C4)
:=main()
:={
:= i2c_start();
:= i2c_write(0x10); //address of slave
:= i2c_write(0x44); //data to slave
:= i2c_stop();
:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 12609

[balamagesh]

:=Your slave code is incorrect. See the "ex_slave.c" for a correct I2C slave code.
:=Additionally, your master goes to sleep after i2c_stop(). Insert a while(1) cycle just after the stop call.
:=

I am trying use Hardware I2c with 16F873 as master and 16F73 as slave.My code is working to some extent.But as per below slave code i am able to receive first address, then data and some hex code( i dont know what is it).How to make my master to send continously and my slave to receive continously. Pls help me in this regard.

i have connected SCL & SDA pin of both the MCU's and also have 1K pull-up resistors in these pins.

Thanks in Advance

SLAVE CODE

#include <16f73.h>
#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT
#USE DELAY(CLOCK=4000000)
#use i2c(slave, SDA=PIN_C4, SCL=PIN_C3, address=0xa0,FORCE_HW)
#byte portb=6
main()
{
byte data;
set_tris_b(0X00);
portb=0X00;
data[0]=i2c_read(); // address of slave is received (0xa0)
portb=data[0];
delay_ms(2000);
data[1]=i2c_read(); // data is received (0x88)
portb=data[1];
delay_ms(1000);
data[2]=i2c_read(); // 0x40 is receieved
portb=data[2];
delay_ms(1000);
i2c_stop();
}

MASTER CODE

#include <16f873.h>
#FUSES XT,NOWDT,NOPROTECT,PUT,NOBROWNOUT,NOLVP,NOCPD,NOWRT
#USE DELAY(CLOCK=4000000)
#use i2c(master,SCL=PIN_C3,SDA=PIN_C4,FORCE_HW)
#byte portb=6
main()
{
set_tris_b(0x00);
portb=0x00;
while(TRUE)
{
i2c_start();
i2c_write(0xa0); //address
i2c_write(0x88); //data
i2c_stop();
}
}
___________________________
This message was ported from CCS's old forum
Original Post ID: 12781