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I2C whatever

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PICLeo

Joined: 14 Dec 2005
Posts: 11
Location: South Africa

I2C whatever

Posted: Mon Jan 23, 2006 4:13 am

Hi

Since a few days I try to get two 18F242 connected. Here the code.

MASTER:

Code:

BYTE data;
#int_TIMER1
TIMER1_isr()
{
output_high(PIN_B3);

i2c_start();
i2c_write(0xa0);
i2c_write(0xEE);
i2c_start();
i2c_write(0xa1);
data = i2c_read(0);
i2c_stop();

printf("|%x|",data);

delay_ms(20);
output_low(PIN_B3);
}

void main()
{
output_high(PIN_B4);
delay_ms(2000);
output_low(PIN_B4);

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_2);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);

enable_interrupts(INT_TIMER1);
enable_interrupts(global);

while(1)
{}

}

Slave:

Code:

enum {address,data};
int mode;
BYTE data1 = 0;
BYTE BUFFER;

#int_SSP
SSP_isr()
{
BYTE ch;
output_high(PIN_B4);

if(i2c_poll())
{
ch = i2c_read(1);

if(mode == address)
{
mode = data;
}
else
{
data1 = ch;
mode = address;
printf("|%x|", data1);
}

}
else i2c_write(0xEE);

delay_ms(20);
output_low(PIN_B4);
}

void main()
{
output_high(PIN_B4);
delay_ms(2000);
output_low(PIN_B4);

enable_interrupts(INT_SSP);
enable_interrupts(global);
mode = address;
while(1);
}

So.

I check the send values via Hyper Terminal.
And thats my problem:
At the slave output I am getting permanently the address of the PIC |a0||a0|... and so on and not the |EE||EE|....
And at the master output |ff||ff| ....

Is there something wrong with the routines or do I have to clear the input buffer of the slave PIC? Because I think the code "should" work. I also screened the signal on the scope. And till the write command everything looks fine.

It would be very nice if somebody could help me. I tried it now to long without result. Sad

BYE

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Jan 23, 2006 10:35 am

Quote:

It would be very nice if somebody could help me. I tried it now to long without result.

My suggestion is to get the CCS example EX_SLAVE.C, working first.
It's in this folder:
c:\Program Files\Picc\Examples

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