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mateeb4u@gmail.com
Joined: 07 Feb 2012
Posts: 19
Location: pakistan
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| I2c Slave receiving Problem on Proteus |
 Posted: Tue Feb 07, 2012 11:50 pm |
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I'm trying to communicate to pic 18f452. First I try on Proteus, at master side it sends the data correctly but at the receiver side it is not responding. I'm posting codes and images.
MASTER:
| Code: |
#include<18F452.h>
#use delay(clock = 4000000)
#use I2C(MASTER, SDA=PIN_B1, SCL=PIN_B0,FAST=400000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
int first_addr=0,last_addr=0;
#fuses NOWDT,NOPROTECT,NOLVP,XT
BYTE write_bit=0x0,read_bit=0x01;
BYTE address=0x60;
BYTE merge (BYTE address,BYTE flag)
{
BYTE out_data;
out_data=((address<<1)|(flag));// to read or write
return out_data;
}
BYTE write(BYTE data ) ///by using default function //it returns ack//problem
{
int ack;
if(first_addr==0)
{
i2c_start(); // Start condition
ack=i2c_write(merge(data,write_bit));// Device address///return ack error
printf("data=%x\n",merge(data,write_bit));
//delay_ms( 2000 );
first_addr++;
}
else
{
ack=i2c_write(data);
printf("data=%x\n",data);
//delay_ms( 2000 );
last_addr++;
if(last_addr==5)
{
i2c_stop(); // Stop condition
last_addr=0;
}
}
return ack;
}
BYTE next_data (int num)
{
BYTE temp;
switch(num)
{
case 0:
temp=address;
return temp;
case 1:
temp=0xB;
return temp;
case 2:
temp=0xF3;
return temp;
case 3:
temp=0x0;
return temp;
case 4:
temp= 0x10 ;
return temp;
case 5:
temp=0x0;
return temp;
}
}
void main (void)
{
BYTE ack;
int i;
BYTE data;//problem of 1 byte
port_b_pullups(TRUE);
for(i=0;i<=5;i++)
{
data=next_data(i);
ack=write(data);
//if(ack==0x01) //if there is no ack//to restart transmission
// i=0;
}
}
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SLAVE:
| Code: |
#include <18F452.h>
#fuses NOWDT,NOPROTECT,NOLVP,XT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#use i2c(SLAVE, sda=PIN_B0, scl=PIN_B1, address=0x60,FORCE_HW)
BYTE datar;
BYTE dataw=0x60;
#INT_SSP
void ssp_interupt ()
{
BYTE state;
//printf("*/n");
state = i2c_isr_state(); //0 - Address match received with R/W bit clear
//1-0x7F - Master has written data; i2c_read() will immediately return the data
//0x80 - Address match received with R/W bit set; respond with i2c_write()
//0x81-0xFF - Transmission completed and acknowledged; respond with i2c_write()
if(state == 0x00)
{
datar=i2c_read();
printf("Adress match:%x\n",datar);
datar=0x00;
}
else if(state > 0 && state < 0x80)
{
datar= i2c_read();
printf("Bytes:%x\n",datar);
datar=0x00;
}
else if(state == 0x80)
{
i2c_write(dataw);
printf("Data write on Master:%x\n",dataw);
}
else if(state > 0x80 && state < 0x100)
{
printf("Data has been acknowledged\n");
}
}
void main ()
{
port_b_pullups(TRUE);
enable_interrupts(GLOBAL);
enable_interrupts(INT_SSP);
while (TRUE) {}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
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| Posted: Wed Feb 08, 2012 5:34 am |
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1) Forget Proteus. It is massively buggy on the PIC peripherals. Individual ones may work on some PIC's, but exactly the same peripheral then doesn't on another.
2) Get rid of the printf's in the receive code. These _will_ stop it from having any hope of working. If you want to debug what is happening, set a number as you go through the receive, and have the loop in the main check when this changes and print it then reset it.
Fundamental problem is that with I2C, things happen too fast _and have to be reacted to quickly_, meaning there is not time to be spent printing in the ISR....
Best Wishes |
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mateeb4u@gmail.com
Joined: 07 Feb 2012
Posts: 19
Location: pakistan
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