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i2c communication between 2 pic877 problem

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uav
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i2c communication between 2 pic877 problem

Posted: Fri Aug 24, 2007 12:44 pm

uav wrote:

hi i've a problem with i2c communication with following code

Code:

master
while (1)
{
while(~porta0){}
while(porta0){}
i2c_start(); // Start condition
i2c_write(0x54); // Device address
i2c_write(8); // Write Command
i2c_stop();
delay_us(50);
i2c_start(); // Start condition
i2c_write(0x54 + 1); // read
[b]for (i = 0; i <7>=0x80)
{

[b]portd++;
i2c_write(0xf1);[/b]

}
else if (state >0)
{
portb = i2c_read();
}
}

i test these codes with protues by checking port values. At this debbuging step slave pic freezes. master demands only 8bytes from slave. but i found that slave tries to send 9 bytes to master (portd indicates 9) and i think program stuck up there. how can i solve this problem thanks for your helps.

sorry for wrong post at different topic

uav
Guest

Posted: Fri Aug 24, 2007 12:45 pm

oops i forget slave codes

Code:

void ssp_interupt ()
{ state=i2c_isr_state();
if (state>=0x80)
{

portd++;
i2c_write(0xf1);

}
else if (state >0)
{
portb = i2c_read();
}
}

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