STC3100Sensor.cpp

00001 /**
00002  * Driver for the STC3100
00003  */
00004 #include "mbed.h"
00005 #include "STC3100Sensor.h"
00006 
00007 I2C i2c(D14, D15);
00008 
00009 /**
00010  * Configuring the STC3100
00011  * ------------------------
00012  * This is done for the user automatically. See datasheet STC3100 page 15 for the
00013  * configuration that is applied.
00014  */
00015 void stc3100Configure(void) {
00016 
00017     //The user need to provide the first address of the register, an increment
00018     //will be done automatically.
00019     char writeData[3];
00020     //REG_MODE address
00021     writeData[0] = 0x00;
00022     //Configuration REG_MODE
00023     writeData[1] = 0x1c;
00024     //Configuration REG_CTRL
00025     writeData[2] = 0x03;
00026 
00027     i2c.write(STC3100_ADRESS_WRITE, writeData, 3);
00028 }
00029 
00030 /**
00031  * Reading the whole memory block (that is been declared) and save it to the byteArray
00032  * of the ustc3100Data union.
00033  */
00034 void stc3100ReadChip(void) {
00035 
00036     i2c.read(STC3100_ADDRESS_READ, &(byteArray[0]), 10);
00037 }
00038 
00039 /**
00040  * Calculating of the data, they will be stored in the stc3100ActualData struct.
00041  */
00042 void updateData(void) {
00043 
00044     unsigned int high_byte = 0;
00045     int value = 0;
00046 
00047     stc3100ReadChip();
00048 
00049     // Converting to voltage
00050     high_byte = (unsigned int) VoltageHigh;
00051     high_byte <<= 8;
00052     value = (high_byte & 0xFF00) | VoltageLow;
00053     voltage = (float) value * 2.44;
00054 
00055     // Converting to current
00056     high_byte = (unsigned int) CurrentHigh;
00057     high_byte <<= 8;
00058     value = (high_byte & 0xFF00) | CurrentLow;
00059     value <<= 2;
00060     current =
00061             ((((float) value * 11.77) / 10.0) / 4.0) > 0.0 ?
00062                     ((((float) value * 11.77) / 10.0) / 4.0) :
00063                     -((((float) value * 11.77) / 10.0) / 4.0);
00064     current -= 54.0;
00065 
00066     // Converting to charge
00067     high_byte = (unsigned int) ChargeHigh;
00068     high_byte <<= 8;
00069     value = (high_byte & 0xFF00) | ChargeLow;
00070     charge = ((float) value * 6.70) / 10.0;
00071 
00072     //  // Converting to temperature
00073     //  high_byte = (unsigned int) stc3100Data.TemperatureHigh;
00074     //  high_byte <<= 8;
00075     //  value = (high_byte & 0xFF00) | stc3100Data.TemperatureLow;
00076     //  value <<= 4;
00077     //  stc3100ActualData.temperature = ((float) value * 0.125) / 16.0;
00078 
00079 }
00080 
00081 /**
00082  * Method for returning the voltage
00083  */
00084 float getVoltage(void) {
00085     return voltage;
00086 }
00087 
00088 /**
00089  * Method for returning the current
00090  */
00091 float getCurrent(void) {
00092     return current;
00093 }
00094 
00095 /**
00096  * Method for returning the charge
00097  */
00098 float getCharge(void) {
00099     return charge;
00100 }