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I2C Slave

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Joined: 16 May 2006
Posts: 39

I2C Slave

Posted: Thu Nov 05, 2009 8:13 am

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I need to set up a slave mode I2C. The device need to send out a character according to the character the master device sends

I don't know is the i2c_write() should follow immediate after the i2c_read() or I need to wait under the master device send a read request. I want to know which function is correct.

Code:

#int_SSP
SSP_isr()
{
int state, n;

state = i2c_isr_state();

if(state < 0x80) { // Master is sending data
n = i2c_read();
switch (n) {
case 0:
i2c_write( targetID[ 0 ] );
break;
case 1:
i2c_write( targetID[ 1 ] );
break;
}

if(state >= 0x80) { // Master is requesting data from slave
}
}

OR

Code:

static int n;
#int_SSP
SSP_isr()
{
int state;

state = i2c_isr_state();

if(state < 0x80) { // Master is sending data
n = i2c_read();
}

if(state >= 0x80) { // Master is requesting data from slave
switch (n) {
case 0:
i2c_write( targetID[ 0 ] );
break;
case 1:
i2c_write( targetID[ 1 ] );
break;
}
}

Thanks for the help.

Rgds.

epitalon
Guest


Posted: Thu Nov 05, 2009 9:35 am

2nd solution, of course

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