bool is_school_zone_detected() {
char buf[10];
bool ret_val = false;
DisableExternalInterrupts();
int a1 = A2D_GetSingleCh_10bit(PIN_IR_SENSOR_1_ADC);
int a3 = A2D_GetSingleCh_10bit(PIN_IR_SENSOR_3_ADC);
int a5 = A2D_GetSingleCh_10bit(PIN_IR_SENSOR_5_ADC);
if(a1 < ADC_BLACK_REFERENCE) {
if(a5 < ADC_BLACK_REFERENCE) {
if(a3 < ADC_BLACK_REFERENCE) {
ret_val = true;
}
}
}
EnableExternalInterrupts();
return ret_val;
}
int getDistance(int channel){
static const int adcCh[2] ={2,3};
static int distanceValue[2][9]={{255,255,255,255,255,255,255,255,255}
,{255,255,255,255,255,255,255,255,255}
};
int tempData[9];
volatile int i,adcValue,distance;
adcValue = (int)A2D_GetSingleCh_10bit((unsigned long)adcCh[channel]);
adcValue = (int)adcToDistance(adcValue); //new distance
//shift
for(i=8;i>0;i--)
distanceValue[channel][i] = distanceValue[channel][i-1];
distanceValue[channel][0] = adcValue;
for(i=0;i<9;i++)
tempData[i] = distanceValue[channel][i];
//median filter
distance = medianFilter(tempData,9,5);
return distance;
}