#include "pressure.h"
#include "../bbb_pin.h"
#include "../log.h" // For Fatal()
+#include "../data.h"
#define PSI_TO_KPA 6.89475729
+/** Uncalibrated values in ADC readings **/
+static double high_raw[] = {642,910,1179,1445,1712,1980};
+/** Calibrated values in kPa **/
+static double high_cal[] = {95, 190, 285, 380, 474, 560};
+
/**
* Get the ADC number of a Pressure sensor
* @param id - Id of the sensor
{
//double voltage = ADC_TO_VOLTS(adc); // convert reading to voltage
+
+
+ //TODO: Fix this
switch (id)
{
case PRES_HIGH0:
case PRES_HIGH1:
{
+ /*
static const double Vs = 5e3; // In mVs
- static const double Pmin = 0.0;
+ static const double Pmin = 0.0 * PSI_TO_KPA;
static const double Pmax = 150.0 * PSI_TO_KPA;
double Vout = ADC_TO_MVOLTS(adc);
return ((Vout - 0.1*Vs)/(0.8*Vs))*(Pmax - Pmin) + Pmin;
+ */
+ return adc;
+ //return Data_Calibrate((double)adc, high_raw, high_cal, sizeof(high_raw)/sizeof(double));
}
case PRES_LOW0:
- return (200.0 * (adc / ADC_RAW_MAX));
+ // Not calibrated!
+ //return (200.0 * ((double)adc / ADC_RAW_MAX));
+ return adc;
default:
Fatal("Unknown Pressure id %d", id);
return -1; // Should never happen
//static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
//pthread_mutex_lock(&mutex);
bool result = false;
- if (ADC_Read(Pressure_GetADC(id), value))
+ int adc = 0;
+ if (ADC_Read(Pressure_GetADC(id), &adc))
{
- *value = Pressure_Callibrate(id, *value);
+ *value = Pressure_Callibrate(id, adc);
result = true;
}
//pthread_mutex_unlock(&mutex);
return result;
}
+
+/**
+ * Sanity check the pressure reading
+ * @param value - The pressure reading (calibrated)
+ * @returns true iff the value is safe, false if it is dangerous
+ */
+bool Pressure_Sanity(int id, double value)
+{
+ return (value < 590);
+}