Diff: EPS.cpp

Revision:

0:7b4c00e3912f

Child:

1:446a959e36ce

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EPS.cpp	Thu Dec 24 19:15:43 2015 +0000
@@ -0,0 +1,403 @@
+#include "EPS.h"
+#include "pin_config.h"
+/***********************************************global variable declaration***************************************************************/
+extern uint32_t BAE_STATUS;
+extern uint32_t BAE_ENABLE;
+
+
+//m_I2C.frequency(10000)
+const char RCOMP0= 0x97;
+BAE_HK_actual actual_data;
+BAE_HK_quant quant_data;
+BAE_HK_min_max bae_HK_minmax;
+BAE_HK_arch arch_data;
+
+//......................................Peripheral declarations.........................................................//
+Serial pc_eps(USBTX,USBRX);
+I2C m_I2C(PIN85,PIN84);
+DigitalOut TRXY(TRXY_DR_EN);            //active high
+DigitalOut TRZ(TRZ_DR_EN);              //active high
+DigitalOut EN3V3A(ENBL3V3A);
+DigitalOut EN_BTRY_HT(BATT_HEAT);
+//DigitalIn BTRY_HT_OUTPUT(BATT_HEAT_OUTPUT);
+AnalogIn Vbatt_ang(VBATT);
+
+//*********************************************************flags********************************************************//
+extern char EPS_INIT_STATUS ;
+extern char EPS_BATTERY_GAUGE_STATUS ;
+extern char EPS_MAIN_STATUS;
+extern char EPS_BATTERY_TEMP_STATUS ;
+extern char EPS_STATUS ;
+
+extern char EPS_BATTERY_HEAT_ENABLE ;
+
+//........................................... FUCTIONS.................................................//
+
+void FCTN_EPS_INIT()
+{
+    printf("\n\r eps init \n");
+    EPS_INIT_STATUS = 's' ;             //set EPS_INIT_STATUS flag
+   // FLAG();
+    FCTN_BATTERYGAUGE_INIT();
+    //FCTN_EPS_BTEMP_INIT();
+    EN3V3A = 1;                             //enable dc dc converter A  
+    char value=alertFlags();
+    unsigned short value_u= (short int )value;
+    value_u &=0x0001;                     
+    if(value_u ==0x0001)                       // battery gauge not initialised
+    {
+        actual_data.power_mode = 1;
+        EPS_BATTERY_GAUGE_STATUS = 'c';               //clear EPS_BATTERY_GAUGE_STATUS
+    }
+    else
+    {
+        actual_data.Batt_gauge_actual[1] = soc();
+        actual_data.Batt_voltage_actual = Vbatt_ang.read()*3.3;
+        FCTN_EPS_POWERMODE(actual_data.Batt_gauge_actual[1]);
+        EPS_BATTERY_GAUGE_STATUS = 's';               //set EPS_BATTERY_GAUGE_STATUS
+    }
+   
+    EPS_INIT_STATUS = 'c' ;             //clear EPS_INIT_STATUS flag
+
+}
+
+//----------------------------------------------------Power algo code--------------------------------------------------------------------//
+void FCTN_EPS_POWERMODE(float soc)              //dummy algo
+{
+    if(soc >= 80)
+        actual_data.power_mode = 4;
+    else if(soc >= 70 & soc < 80)
+        actual_data.power_mode = 3;
+    else if(soc >= 60 & soc < 70)
+        actual_data.power_mode = 2;
+    else if(soc < 60)
+        actual_data.power_mode = 1;
+}
+
+//...................................................HK...........................................//
+
+int quantiz(float start,float step,float x)
+{
+    int y=(x-start)/step;
+    if(y<=0)y=0;
+    if(y>=255)y=255;
+    return y;
+}
+
+void HK_main()
+{
+    
+}
+
+//............................................BATTERY GAUGE......................................//
+void FCTN_BATTERYGAUGE_INIT()
+{
+        disable_sleep();
+        disable_hibernate();
+        socChangeAlertEnabled(true); //enabling alert on soc changing by 1%
+        emptyAlertThreshold(32);//setting empty alert threshold to 32% soc
+        vAlertMinMaxThreshold();//set min, max value of Valrt register
+        vResetThresholdSet();//set threshold voltage for reset
+        vResetAlertEnabled(true);//enable alert on reset for V < Vreset
+}
+
+void FCTN_BATTERYGAUGE_MAIN(float Battery_parameters[4])
+{
+    
+
+        float temp=25;    //=Battery_temp  (from temp sensor on battery board)       //value of battery temperature in C currently given a dummy value. Should be updated everytime.
+        tempCompensation(temp);
+    
+        
+        Battery_parameters[0]=vcell();
+        Battery_parameters[1]=soc();
+        Battery_parameters[2]=crate();
+       
+        printf("\nVcell=%f",vcell());       //remove this for final code
+        printf("\nSOC=%f",soc());           //remove this for final code
+        printf("\nC_rate=%f",crate());      //remove this for final code
+
+       
+        if (alerting()== true)       //alert is on
+        {   
+            Battery_parameters[3]=alertFlags();
+            clearAlert();//clear alert
+            clearAlertFlags();//clear all alert flags
+        }
+        
+}
+
+unsigned short read(char reg)
+    {
+         
+         //Create a temporary buffer
+        char buff[2];
+ 
+        //Select the register
+        m_I2C.write(m_ADDR, &reg, 1, true);
+ 
+        //Read the 16-bit register
+        m_I2C.read(m_ADDR, buff, 2);
+ 
+        //Return the combined 16-bit value
+        return (buff[0] << 8) | buff[1];
+    }
+ 
+    
+    void write(char reg, unsigned short data)
+    {
+        //Create a temporary buffer
+        char buff[3];
+ 
+        //Load the register address and 16-bit data
+        buff[0] = reg;
+        buff[1] = data >> 8;
+        buff[2] = data;
+ 
+        //Write the data
+        m_I2C.write(m_ADDR, buff, 3);
+    }
+   
+ 
+ 
+    // Command the MAX17049 to perform a power-on reset
+    void reset()
+    {
+        //Write the POR command
+        write(REG_CMD, 0x5400);
+    }
+    
+    // Command the MAX17049 to perform a QuickStart
+     void quickStart()
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_MODE);
+ 
+        //Set the QuickStart bit
+        value |= (1 << 14);
+ 
+        //Write the value back out
+        write(REG_MODE, value);
+    }
+    
+    
+   //disable sleep
+   void disable_sleep()
+    {
+        unsigned short value = read(REG_MODE);
+        value &= ~(1 << 13);
+        write(REG_MODE, value);
+    }
+  
+    //disable the hibernate  of the MAX17049
+    void disable_hibernate()
+    {
+        write(REG_HIBRT, 0x0000);
+    }
+  
+    
+    // Enable or disable the SOC 1% change alert on the MAX17049
+    void socChangeAlertEnabled(bool enabled)
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_CONFIG);
+ 
+        //Set or clear the ALSC bit
+        if (enabled)
+            value |= (1 << 6);
+        else
+            value &= ~(1 << 6);
+ 
+        //Write the value back out
+        write(REG_CONFIG, value);
+} 
+
+
+void compensation(char rcomp)
+{
+    //Read the current 16-bit register value
+    unsigned short value = read(REG_CONFIG);
+ 
+    //Update the register value
+    value &= 0x00FF;
+    value |= rcomp << 8;
+ 
+    //Write the value back out
+    write(REG_CONFIG, value);
+}
+
+ 
+void tempCompensation(float temp)
+{
+    //Calculate the new RCOMP value
+    char rcomp;
+    if (temp > 20.0) {
+        rcomp = RCOMP0 + (temp - 20.0) * -0.5;
+    } else {
+        rcomp = RCOMP0 + (temp - 20.0) * -5.0;
+    }
+ 
+    //Update the RCOMP value
+    compensation(rcomp);
+}
+
+  // Command the MAX17049 to de-assert the ALRT pin
+    void clearAlert()
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_CONFIG);
+ 
+        //Clear the ALRT bit
+        value &= ~(1 << 5);
+ 
+        //Write the value back out
+        write(REG_CONFIG, value);
+    }
+  
+ 
+    //Set the SOC empty alert threshold of the MAX17049
+    void emptyAlertThreshold(char threshold)
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_CONFIG);
+ 
+        //Update the register value
+        value &= 0xFFE0;
+        value |= 32 - threshold;
+ 
+        //Write the 16-bit register
+        write(REG_CONFIG, value);
+    }
+    
+    // Set the low and high voltage alert threshold of the MAX17049
+    void vAlertMinMaxThreshold()
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_VALRT);
+ 
+        //Mask off the old value
+    
+                value = 0x96D2;
+     
+        //Write the 16-bit register
+        write(REG_VALRT, value);
+    }
+
+    
+    // Set the reset voltage threshold of the MAX17049
+    void vResetThresholdSet()
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_VRESET_ID);
+ 
+        //Mask off the old //value
+        value &= 0x00FF;//Dis=0
+ 
+        value |= 0x9400;//corresponding to 2.5 V
+    
+ 
+        //Write the 16-bit register
+        write(REG_VRESET_ID, value);
+    }
+    
+    
+    // Enable or disable the voltage reset alert on the MAX17049
+     void vResetAlertEnabled(bool enabled)
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_STATUS);
+    
+        //Set or clear the EnVR bit
+        if (enabled)
+            value |= (1 << 14);
+        else
+            value &= ~(1 << 14);
+ 
+        //Write the value back out
+        write(REG_STATUS, value);
+    }
+ 
+    //Get the current alert flags on the MAX17049
+    //refer datasheet-status registers section to decode it.
+    char alertFlags()
+    {
+        //Read the 16-bit register value
+        unsigned short value = read(REG_STATUS);
+ 
+        //Return only the flag bits
+        return (value >> 8) & 0x3F;
+    }
+    
+    // Clear all the alert flags on the MAX17049
+    void clearAlertFlags()
+    {
+        //Read the current 16-bit register value
+        unsigned short value = read(REG_STATUS);
+ 
+        //Clear the specified flag bits
+        value &= ~( 0x3F<< 8);
+ 
+        //Write the value back out
+        write(REG_STATUS, value);
+    }
+    
+    // Get the current cell voltage measurement of the MAX17049
+    float vcell()
+    {
+        //Read the 16-bit raw Vcell value
+        unsigned short value = read(REG_VCELL);
+ 
+        //Return Vcell in volts
+        return value * 0.000078125*2;
+    }
+    
+    // Get the current state of charge measurement of the MAX17049 as a float
+    float soc()
+    {
+        unsigned short value;
+        char buff[2];
+ 
+        //Select the register
+        m_I2C.write(m_ADDR, &REG_SOC, 1, true);
+ 
+        //Read the 16-bit register
+        bool ack = true; 
+        ack = m_I2C.read(m_ADDR, buff, 2);
+ 
+        //Return the combined 16-bit value
+        value =  (buff[0] << 8) | buff[1];
+       /* 
+        //Read the 16-bit raw SOC value
+        unsigned short value = read(REG_SOC);*/
+ 
+        //Return SOC in percent
+        if(ack == 0)
+        return value * 0.00390625;
+        else 
+        return 200;
+    }
+    
+   
+ 
+    // Get the current C rate measurement of the MAX17049
+    float crate()
+    {
+        //Read the 16-bit raw C/Rate value
+        short value = read(REG_CRATE);
+ 
+        //Return C/Rate in %/hr
+        return value * 0.208;
+    }
+    
+    // Determine whether or not the MAX17049 is asserting the ALRT pin
+    bool alerting()
+    {
+        //Read the 16-bit register value
+        unsigned short value = read(REG_CONFIG);
+ 
+        //Return the status of the ALRT bit
+        if (value & (1 << 5))
+            return true;
+        else
+            return false;
+    }
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