Hello all,
i am having a problem with IIC Master Mode at MC9S08DZ60CLC MCU. Since two days I try to figure out how to send anything on IIC-bus.
What I did: Initialize IIC -> Try to send 1 byte.
What happens: Nothing (I monitor SDA, SCL with Logic-Analyzer, function verified). SDA, SCL lines stay high always.
What I can do: Toggle the two pins manually when setting them to GPIO.
What I read so far: Datasheet, AN3291 "How to Use IIC Module on M68HC08, HCS08, and HCS12 MCUs", HCS08QRUG.
Anybody has any idea what could be the problem?
I would expect that my code (at least once) generates a start condition on the bus and/or transmit the data byte...
Kind regards,
Alex
Here is my (complete!) code:
void main(void) {
MCU_init();
IICC_IICEN = 1;//Enable IIC module
IICC_TXAK = 1;// SEND ACK
IICC_MST = 0;//SLAVE MODE
IICA = 0b10;//set slave address in IICA //PTB6=SDA PTB7=SCL
//set baud rate = BUSCLK/(2xMULTx(SCL Divider))
// MUX | ICR|
// \\ /////
IICF = 0b10010000;//MUX=2,ICR=0x16 Speed=100Khz
IICS_SRW = 0;//R/W bit = 0
IICC_IICIE = 0;//Disable IIC interrupt
PTAD_PTAD7 = 1;
for(;;) {
if(IICC_MST == 1){
PTAD_PTAD7 = 0;
}
if(TPM1SC_TOF){
WriteBytesI2C(0xAB, 0x0);
IICC_MST = 0;
TPM1SC_TOF = 0;
}
__RESET_WATCHDOG(); //By default COP is disabled with device init. When enabling, also reset the watchdog. */
} /* loop forever */
/* please make sure that you never leave main */
}
unsigned char WriteBytesI2C (unsigned char slaveAddress,unsigned char numberOfBytes){
unsigned char Temp;
/* Format the slave address to place a 0 on the R/W bit (LSB).*/
slaveAddress &= 0xFE;
IICC_IICEN = 0;
IICC_IICEN = 1;
IICS; /* Clear any pending interrupt */
IICS_IICIF=1;
IICC_MST = 0;
IICS_SRW=0;
IICC_TX = 1; /* Select Transmit Mode */
IICC_MST = 1; /* Select Master Mode (Send Start Bit) */
for(Temp=0;Temp<50;Temp++); /* Small delay */
IICD=slaveAddress; /* Send selected slave address */
return(1);
}
