int main(void)
{
// (Using SDA1 and SCL1
// Configure I2C Port
i2cInit(1,157);
delay_ms(500);
while(1)
{
// Start bit + Address + read or write bit
i2c1StartAddress(I2Caddr, 0); //(7-seg address, write (0))
// Data + Ack
i2c1WriteByte(clrDisplay);
i2c1WriteByte('1');
i2c1WriteByte('2');
i2c1WriteByte('3');
i2c1WriteByte('4');
// Stop Bit
i2c1Stop();
delay_ms(1000);
// Start bit + Address + read or write bit
i2c1StartAddress(I2Caddr, 0); //(7-seg address, write (0))
// Data + Ack
i2c1WriteByte(clrDisplay);
i2c1WriteByte('a');
i2c1WriteByte('5');
i2c1WriteByte('d');
i2c1WriteByte('b');
// Stop Bit
i2c1Stop();
delay_ms(1000);
}
return (EXIT_SUCCESS);
}
void __attribute__((__interrupt__, no_auto_psv)) _MI2C1Interrupt(void){
switch (i2c1State) {
case CONFIG_START:
if (!I2C1CONbits.SEN){
// change the state
i2c1State = CONFIG_IDTX;
// Send the address to write
i2c1Write(MAG_WRITE);
}
break;
case CONFIG_IDTX:
if (!I2C1STATbits.ACKSTAT){
// change the state
i2c1State = CONFIG_REG_TX;
// send the register address
i2c1Write(reg2Config);
}
break;
case CONFIG_REG_TX:
if (!I2C1STATbits.ACKSTAT){
i2c1State = CONFIG_VAL_TX;
if (reg2Config==REGISTER_A){
// send the actual configuration for 50Hz
i2c1Write(MODE_50_HZ);
} else {
// send the configuration for continuous sampling
i2c1Write(MODE_CONTINUOS);
}
}
break;
case CONFIG_VAL_TX:
if (!I2C1STATbits.ACKSTAT){
i2c1State = CONFIG_DONE;
// Send a bus Stop
i2c1Stop();
}
break;
case CONFIG_STOP:
if (!I2C1CONbits.PEN){
if (reg2Config!=MODE_REGISTER){
// Set the Config to idle, wait for next config
i2c1State = CONFIG_IDLE;
} else {
// Ready to read magnetometer data
i2c1State = READ_IDLE;
}
}
break;
case READ_START:
if (!I2C1CONbits.SEN){
// change the state
i2c1State = READ_IDTX;
// Send the address to write
i2c1Write(MAG_READ);
}
break;
case READ_IDTX:
//if (!I2C1CONbits.RSEN){
if (!I2C1STATbits.ACKSTAT){
// change the state
i2c1State = READ_DATA;
// Start Clocking Data
I2C1CONbits.RCEN = 1;
}
break;
case READ_DATA:
if (I2C1STATbits.RBF){
//printToUart2("br:%d wr:%d dc:%d\n\r",byteRead, wordRead,byteCount);
byteCount++;
// read the received Data
if (byteCount < 7) {
currentMag.chData[byteRead] = (unsigned char)I2C1RCV;
//printToUart2("byte:%d\n\r", I2C1RCV);
} else {
wordRead= (unsigned char)I2C1RCV;
byteRead = 1;
//printToUart2("ignored:%d\n\r", I2C1RCV);
}
// if we just read a word (i.e. byteRead == 1)
if(byteRead == 0)
{
//printToUart2("%u\n\r",currentMag.usData);
readMag(wordRead,currentMag.shData);
wordRead++;
}
// flip the byte
byteRead = byteRead == 0? 1 : 0;
//if (wordRead >= 3){
if (byteCount >= 7 ){
// Done Generate a NACK
I2C1CONbits.ACKDT = 1;
I2C1CONbits.ACKEN = 1;
} else {
// Generate the AKN
I2C1CONbits.ACKDT = 0;
I2C1CONbits.ACKEN = 1;
}
} else if (!I2C1STATbits.ACKSTAT){
//if (wordRead < 3){
if (byteCount < 7){
// Enable reading
I2C1CONbits.RCEN = 1;
} else {
// change the state
i2c1State = READ_DONE;
i2c1Stop();
}
}
break;
case READ_STOP:
if (!I2C1CONbits.PEN){
// Ready to read next magnetometer data
i2c1State = READ_IDLE;
}
break;
}
//
IFS1bits.MI2C1IF = 0; // Clear the master interrupt
I2C1STATbits.IWCOL = 0; // Clear the collision flag just in case
}
