HC12 IIC - Need help

chuckles — Sat, 03 Mar 2007 05:48:37 GMT

I need some pointers/help in using IIC bus.

I'm using it to send data to a serial DAC (Max521), which is compatible with IIC. However, when I run my code I'm not convinced that it is outputting the correct wave forms...

The code is something like this:

for(; {
init_IIC();
write_IIC();

}

void init_IIC(){
//Try Setting DDRJ
DDRJ_DDRJ6=1;
DDRJ_DDRJ7=1;

IBFD = 0x20; //Frequency divider
IBAD = 0x1F; //This is to set the slave address of the IIC -- Doesn't really matter ?
IBCR= 0xB0; //Enables, makes master, sets to transmit
}

void write_IIC() {
IBDR = 0x50; // Slave Address 0101 0000

while(IBSR_TCF ==0 ) {
   asm(nop);
}

IBDR= 0x00; //DAC0

while(IBSR_TCF ==0 ) {
   asm(nop);
}

IBDR = 0xFF;//Activate DAC full tilt

while(IBSR_TCF ==0 ) {
   asm(nop);
}

IBCR = 0; //Stop Transmission.
}

Any Suggestions would be greatly appreciated. Thanks guys.

Re: HC12 IIC - Need help

erooll — Thu, 14 Jun 2007 22:48:13 GMT

Try change your code for this

void write_IIC() {
IBDR = 0x50; // Slave Address 0101 0000

//wait until transfer all byte
while(!IBSR_IBIF);

//clear flag
IBSR_IBIF = 1;

    //Check ACK
     if(IBSR_RXACK)      //if this bit its set, the device not response
       _asm nop;           //include here something
    else
       _asm nop;         //All OK, your DAC response to Address call
}

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HC12 IIC - Need help

Re: HC12 IIC - Need help