Battery Management Routines for the eXPal Prototype A. More...
#include <avr/io.h>Go to the source code of this file.
Defines | |
| #define | HL_BAT_VOLT_INVALID 0x7fff |
| Invalid Voltage Value. | |
| #define | HL_BAT_MEASURE_ACTIVE 0x8000 |
| MSB in voltage value used to indicate measurement in progress. | |
| #define | HL_BAT_FULL_VOLT 4500 |
| Voltage to recognize full battery. | |
| #define | HL_BAT_MIN_VOLT 2500 |
| Voltage to recognize an empty battery. | |
| #define | HL_BAT_MIN_GPS_VOLT 3500 |
| Min voltage to allow GPS power on When the system voltage is below this value, the GPS will not be activated. | |
| #define | HL_BAT_MAX_VOLT_GRADIENT -50 |
| Gradient Threshold Gradient value when battery state is checked. | |
| #define | HL_BAT_GRADIENT_COUNT_PON -5 |
| Voltage Gradient Counter Variables. | |
| #define | HL_BAT_GRADIENT_COUNT_MAX 32400 |
| 9 hours, Value will not be incremented beyond this limit | |
| #define | HL_BAT_ST_FOPMAX 0x09 |
| BatteryStates and Limits. | |
| #define | HL_BAT_V_FOPMAX HL_BAT_FULL_VOLT |
| #define | HL_BAT_ST_FOP4 0x08 |
| Battery full (8). | |
| #define | HL_BAT_V_FOP4 HL_BAT_MIN_GPS_VOLT + (4 * (HL_BAT_FULL_VOLT - HL_BAT_MIN_GPS_VOLT) / 5) |
| #define | HL_BAT_ST_FOP3 0x07 |
| Battery full (7). | |
| #define | HL_BAT_V_FOP3 HL_BAT_MIN_GPS_VOLT + (3 * (HL_BAT_FULL_VOLT - HL_BAT_MIN_GPS_VOLT) / 5) |
| #define | HL_BAT_ST_FOP2 0x06 |
| Battery full (6). | |
| #define | HL_BAT_V_FOP2 HL_BAT_MIN_GPS_VOLT + (2 * (HL_BAT_FULL_VOLT - HL_BAT_MIN_GPS_VOLT) / 5) |
| #define | HL_BAT_ST_FOP1 0x05 |
| Battery full (5). | |
| #define | HL_BAT_V_FOP1 HL_BAT_MIN_GPS_VOLT + (1 * (HL_BAT_FULL_VOLT - HL_BAT_MIN_GPS_VOLT) / 5) |
| #define | HL_BAT_ST_FOPMIN 0x04 |
| Min Level for full operation (4). | |
| #define | HL_BAT_V_FOPMIN HL_BAT_MIN_GPS_VOLT |
| #define | HL_BAT_ST_LIM3 0x03 |
| Battery Limited (3). | |
| #define | HL_BAT_V_LIM3 HL_BAT_MIN_VOLT + (3 * (HL_BAT_MIN_GPS_VOLT - HL_BAT_MIN_VOLT)/ 4) |
| #define | HL_BAT_ST_LIM2 0x02 |
| Battery Limited (2). | |
| #define | HL_BAT_V_LIM2 HL_BAT_MIN_VOLT + (2 * (HL_BAT_MIN_GPS_VOLT - HL_BAT_MIN_VOLT)/ 4) |
| #define | HL_BAT_ST_LIM1 0x01 |
| Battery Limited (1). | |
| #define | HL_BAT_V_LIM1 HL_BAT_MIN_VOLT + (1 * (HL_BAT_MIN_GPS_VOLT - HL_BAT_MIN_VOLT)/ 4) |
| #define | HL_BAT_ST_EMPTY 0x00 |
| Battery Limited (0). | |
| #define | HL_BAT_V_EMPTY HL_BAT_MIN_VOLT |
| #define | HL_BAT_ST_MASK 0x0F |
| BatteryStatus byte section. | |
| #define | HL_BAT_UPDATE 0x80 |
| Check Bat Condition when set (xpal_bat internal bit). | |
| #define | HL_BAT_NEWSTAT 0x40 |
| Status is new and returned for the first time. | |
| #define | HL_BAT_BLED_OFF 0x20 |
| Notice that Battery level is fast decreasing. | |
| #define | HL_BAT_GPS_STOP 0x10 |
| Notice that GPS will be powered off. | |
| #define | HL_BAT_MV_PER_DIGIT 5 |
| convert ADC result into millivolt | |
Functions | |
| void | hl_InitBatMan (void) |
| Init battery management system. | |
| uint8_t | hl_bat_GetBatStatus (void) |
| Estimate the Battery condition and return the state for the. | |
| uint16_t | hl_pwr_GetBatVoltage (void) |
| Request current bat voltage. | |
| uint16_t | hl_pwr_GetBatGradient (void) |
| Request current bat voltage gradient. | |
| uint16_t | hl_adc_correct (uint16_t r) |
| correct the value read from ADC | |
| uint16_t | hl_adc_convert (uint16_t r) |
Variables | |
| volatile uint8_t | BatStatus |
| Battery status byte. | |
| volatile uint16_t | BatVoltage |
| voltage in mV | |
| volatile int16_t | BatGradient |
| voltage gradient in mV | |
| volatile int16_t | BatGradientTimer |
| BatGradient was collected over this time [s]. | |
| int8_t | adc_calibration |
| ADC calibration value. | |
Battery Management Routines for the eXPal Prototype A.
| #define HL_BAT_GRADIENT_COUNT_PON -5 |
Voltage Gradient Counter Variables.
Loaded at power up to ignore the first 5 cycles
| #define HL_BAT_MV_PER_DIGIT 5 |
convert ADC result into millivolt
mV per digits 2.56V reference / 10bit -> 1024 = 2.5mV per digit The board implements a 1/2 Voltage divider -> 5mV per digit
| r | output from ADC |
| #define HL_BAT_ST_FOPMAX 0x09 |
BatteryStates and Limits.
Battery full (9)
| #define HL_BAT_ST_MASK 0x0F |
BatteryStatus byte section.
Battery State bits
| #define HL_BAT_VOLT_INVALID 0x7fff |
Invalid Voltage Value.
Voltage unknown or not measured yet
| uint16_t hl_adc_correct | ( | uint16_t | r | ) | [inline] |
correct the value read from ADC
hl_adc_correct() adjusts the value read from ADC according to the calibration value stored in adc_calibration.
The correction is performed by adding the fraction specified by adc_calibration to the value read from ADC.
The range (factor 0.5 .. 1.5) should be sufficient.
{
return r + ((int32_t)r * adc_calibration >> 8);
}
| uint8_t hl_bat_GetBatStatus | ( | void | ) |
Estimate the Battery condition and return the state for the.
The battery voltage is evaluated to estimate the battery status
{
// return old value when no reevaluation event happened
if((BatStatus & HL_BAT_UPDATE) == 0){
// return old value when no reevaluation event happened
BatStatus &= ~(HL_BAT_NEWSTAT);
}else{
// clear update state
BatStatus &= ~(HL_BAT_UPDATE);
// clear battery state
BatStatus &= ~(HL_BAT_ST_MASK);
if(BatVoltage >= HL_BAT_V_FOPMIN){
// we have enough power for full operation
if (BatVoltage > HL_BAT_V_FOPMAX){
BatStatus |= HL_BAT_ST_FOPMAX;
}else if(BatVoltage > HL_BAT_V_FOP4){
BatStatus |= HL_BAT_ST_FOP4;
}else if(BatVoltage > HL_BAT_V_FOP3){
BatStatus |= HL_BAT_ST_FOP3;
}else if(BatVoltage > HL_BAT_V_FOP2){
BatStatus |= HL_BAT_ST_FOP2;
}else if(BatVoltage > HL_BAT_V_FOP1){
BatStatus |= HL_BAT_ST_FOP1;
}else{
BatStatus |= HL_BAT_ST_FOPMIN;
}
}else{
// we are in limited op mode now
if (BatVoltage > HL_BAT_V_LIM3){
BatStatus |= HL_BAT_ST_LIM3;
}else if(BatVoltage > HL_BAT_V_LIM2){
BatStatus |= HL_BAT_ST_LIM2;
}else if(BatVoltage > HL_BAT_V_LIM1){
BatStatus |= HL_BAT_ST_LIM1;
}else if(BatVoltage > HL_BAT_V_EMPTY){
BatStatus |= HL_BAT_ST_LIM1;
}else{
BatStatus |= HL_BAT_ST_EMPTY;
}
}
// mark status as new value
BatStatus |= HL_BAT_NEWSTAT;
// !!!! debug
printf("\n\r.%X %imV", BatStatus, BatVoltage);
}
// Evaluate discharge Gradient
if(BatGradient < HL_BAT_MAX_VOLT_GRADIENT){
// Need to collect data on this value
// useful code comming soon
// !!!! debug
printf(":%imV_%is \n\r", BatGradient, BatGradientTimer);
BatGradientTimer = 1;
BatGradient = 0;
}
return BatStatus;
}
| void hl_InitBatMan | ( | void | ) |
Init battery management system.
Initialize
Initialize
This function needs to be called early in main(), before the 1s timer is running to ensure that there is an initial value for the battery voltage available
The init function will take some time to do the first measurement.
{
int8_t calvalue;
BatVoltage = HL_BAT_VOLT_INVALID;
BatGradient= 0;
BatGradientTimer = HL_BAT_GRADIENT_COUNT_PON;
// Start with low bat setting and activate update
BatStatus = HL_BAT_ST_FOP1 & HL_BAT_UPDATE;
// Start initial voltage measurement
hl_adc_init();
// Do the initial measurement
// This is required for the later gradient calculation
hl_adc_StartNwait4conversion();
/* read calibration value from EEPROM */
calvalue = eeprom_read_byte (CFG_CALIB_BATT_VOLT);
if (calvalue != 0xFF)
adc_calibration = calvalue;
BatVoltage = adc_calibration + hl_adc_convert(hl_adc_result ());
// register 1s timer call back
hl_asyn_Register1sTimer( (&hl_bat_slow), NULL);
}
| uint16_t hl_pwr_GetBatGradient | ( | void | ) | [inline] |
Request current bat voltage gradient.
{
return BatGradient;
};
| uint16_t hl_pwr_GetBatVoltage | ( | void | ) | [inline] |
Request current bat voltage.
{
return (BatVoltage & ~HL_BAT_MEASURE_ACTIVE);
};
| int8_t adc_calibration |
ADC calibration value.
The calibration value is read from EEPROM during initialization. To get the corrected ADC output, use hl_adc_correct().
1.7.1