int checkTemperature(int channel){
//TODO: comment code
double temp = readTempSensor(channel);
if(temp < TEMP_MIN || temp > TEMP_MAX){
setRelay(RELAY_OFF);
return RED_STATUS;
}
if(temp <= TEMP_YELLOW_MIN || temp >= TEMP_YELLOW_MAX){
return OVERTEMP_STATUS;
}
else{
return GREEN_STATUS;
}
}
void main(void)
{
unsigned char address;
unsigned char byte1, byte2, slope, counter;
int temp, old_temp;
int diff, last_diff;
// zero our variables to save iteration values
old_temp = 0;
last_diff = 0;
// Set internal oscillator to 4Mhz
OSCCON = 0x6C;
// Set PORT C (TRISC<3:4> bits) as digital outputs
TRISC = 0x18;
LATC = 0x18;
// Set Port B for digital output (LEDs)
TRISB = 0x00;
LATB = 0x3F;
address = 0x07; // don't use this right now!
setTempSensorAddress(address);
// According to the datasheet, with a 4Mhz clock we
// need SSPADD set to 0x28 to get a 100KHz clock for
// the i2c master. However, this is clearly wrong
// when you look at the i2c clock with the logic tool.
// The i2c frequency is about 23 KHz. An errata sheet
// for the processor says there is an error in the data
// sheet. SSPADD = 0x0A appears to get 83KHz.
SSPADD = 0x0A;
// Init PIC I2C hardware as Master
OpenI2C (MASTER, SLEW_OFF);
configStartTempSensor();
while(1) {
// Flash top red LED to indicate that the program is running
LATBbits.LATB5 = ~(LATBbits.LATB5 & 1);
// read temp sensor, get bytes for more accurate result
readTempSensor(&byte1, &byte2, &slope, &counter);
// check to see if we have a read error. If not, check to
// see if the temperature has changed. If so, do something
// with the red LEDs.
if(byte1!=0xFF) {
temp = (int) byte1;
temp = temp << 1;
byte2 = byte2 >> 7;
temp = temp + (int) byte2;
diff = temp - old_temp;
if(diff<0) diff = -diff;
if((diff+last_diff)>=3) {
LATB = 0x3F;
} else if ((diff+last_diff)==2) {
LATB = 0x1F;
} else if ((diff+last_diff)==1) {
LATB = 0x0F;
} else {
LATB = 0x07;
}
// save temp as old_temp to compute difference
old_temp = temp;
last_diff = diff;
} else {
