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I2C SET MULTI_MASTER

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david91184

Joined: 09 Apr 2011
Posts: 1
Location: Taiwan

I2C SET MULTI_MASTER

Posted: Sun Apr 10, 2011 2:39 am

I have to do is to use four dsPIC33 the value to an EEPROM using I2C transmission problems, I now hit me that the signal will be searched on the site also tried to sample a lot of information occur collision would like to ask the network signal Of you help me

Code:

#include <33FJ64MC802.h>
#fuses HS,NOWDT,NODEBUG,NOWRTSS,NOPROTECT ,PR_PLL,ALTI2C

#use delay (clock=80M, crystal=10M)

#pin_select U1TX = PIN_B4
#pin_select U1RX = PIN_B5

#use rs232(UART1,baud=115200,parity=N,bits=8)
#bit U1STA_UTXEN = 0x223.2

#use i2c(multi_master, scl=PIN_B8, sda=PIN_B9)

char cmd;
int flag=0;
int16 data_a0=0,data_a1=0,data_read=0,x=0,POS1CNT=0,y=0;

/*void init_ext_eeprom()
{
output_float(PIN_B8);
output_float(PIN_B9);
}*/

void write()
{
int status;
int state;

do
{
output_high(pin_a0);
i2c_start();
state=i2c_write(0xa0);
if(state==0)
{
if(y!=POS1CNT)
{
i2c_start();
i2c_write(0xa0);
i2c_write(0x01>>8);
i2c_write(0x01);
i2c_write(POS1CNT>>8);
i2c_stop();
i2c_start();
status=i2c_write(0xa0);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0);
}
i2c_stop();

i2c_start();
i2c_write(0xa0);
i2c_write(0x02>>8);
i2c_write(0x02);
i2c_write(POS1CNT);
i2c_stop();
i2c_start();
status=i2c_write(0xa0);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0);
}
i2c_stop();
y=POS1CNT;
}
}
if(state==1) i2c_stop();
output_low(pin_a0);
}while(state!=0);
}

int read1()
{
int state;
do
{
i2c_start();
state=i2c_write(0xa0);
if(state==0)
{
i2c_start();
i2c_write(0xa0);
i2c_write(0x01>>8);
i2c_write(0x01);
i2c_start();
i2c_write(0xa1);
data_a0=i2c_read(0);
i2c_stop();

i2c_start();
i2c_write(0xa0);
i2c_write(0x02>>8);
i2c_write(0x02);
i2c_start();
i2c_write(0xa1);
data_a1=i2c_read(0);
i2c_stop();

data_read=(data_a0<<8)+data_a1;
}
if(state==1) i2c_stop();
}while(state!=0);
return data_read;
}

#int_RDA
void RDA_isr()
{
cmd = getchar();
switch(cmd)
{
case 'S':
U1STA_UTXEN = 1;
break;

case 'E':
U1STA_UTXEN = 0;
break;

case 'Q':
flag=1;
break;

case 'W':
flag=0;
break;

}
}

#INT_TIMER1
void TIMER1_isr( )
{
set_timer1(65535-125);
x++;

if(x == 100)
{
x=0;
write();
}
}

void main (void)
{
enable_interrupts(INT_RDA);
enable_interrupts(INT_TIMER1);
enable_interrupts (INTR_GLOBAL);

setup_timer1(TMR_INTERNAL|TMR_DIV_BY_8);

U1STA_UTXEN = 0;

//init_ext_eeprom();

POS1CNT=read1();

while (1)
{
output_high(pin_b15);
if(flag==1)
{
printf("\r\nPOS1CNT:%d",POS1CNT++);
}
}
}

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