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I2C HELP

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GLADKIH
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I2C HELP

Posted: Thu Feb 19, 2009 12:15 pm

hello from UKRAINE.

master

Code:

i2c_start();
i2c_write(ADRES+1);
prom=i2c_read(0);
i2c_stop();

slave

Code:

#int_SSP
VOID SSP_isr()
{
signed long long int prom;

state = i2c_isr_state();

if (state>=128)
{
prom=170;
i2c_write(prom);

}

}

Why at a parcel(sending) master of this code slave two times come into interruption. First time after exhibiting the address and second time after exhibiting stop. Thus if I put if (state > =128) that the master hangs. And if if (state == 128) that all is normal. Unless on stop there should be an interruption??. And still as to me to organize the program slave if the master transfers the following

Code:

i2c_start ();
i2c_write (ADRES+1);
prom=i2c_read (0);
prom=i2c_read (0);
prom=i2c_read (0);
i2c_stop ();

It is the text I translate(transport) by the interpreter therefore excuse for rough translation.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Feb 19, 2009 6:40 pm

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

Quote:

c:\Program Files\picc\Examples\Ex_Slave.c

Use the code in this post for the Master PIC:
http://www.ccsinfo.com/forum/viewtopic.php?t=32368&start=3

This will show how to write and read a byte between the master PIC
and the slave PIC with i2c.

Make sure that you have pull-up resistors on the SDA and SCL lines.
You can use 4.7K (4700 ohms) resistors.

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