159 lines
5.4 KiB
C
159 lines
5.4 KiB
C
/*
|
|
* This file is part of Cleanflight.
|
|
*
|
|
* Cleanflight is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Cleanflight is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "stdbool.h"
|
|
#include "stdint.h"
|
|
|
|
#include "common/maths.h"
|
|
|
|
#include "drivers/adc.h"
|
|
#include "drivers/system.h"
|
|
|
|
#include "config/runtime_config.h"
|
|
#include "config/config.h"
|
|
|
|
#include "sensors/battery.h"
|
|
|
|
#include "rx/rx.h"
|
|
|
|
#include "io/rc_controls.h"
|
|
|
|
// Battery monitoring stuff
|
|
uint8_t batteryCellCount = 3; // cell count
|
|
uint16_t batteryWarningVoltage;
|
|
uint16_t batteryCriticalVoltage;
|
|
|
|
uint8_t vbat = 0; // battery voltage in 0.1V steps
|
|
uint16_t vbatLatestADC = 0; // most recent unsmoothed raw reading from vbat ADC
|
|
uint16_t amperageLatestADC = 0; // most recent raw reading from current ADC
|
|
|
|
int32_t amperage = 0; // amperage read by current sensor in centiampere (1/100th A)
|
|
int32_t mAhDrawn = 0; // milliampere hours drawn from the battery since start
|
|
|
|
batteryConfig_t *batteryConfig;
|
|
|
|
uint16_t batteryAdcToVoltage(uint16_t src)
|
|
{
|
|
// calculate battery voltage based on ADC reading
|
|
// result is Vbatt in 0.1V steps. 3.3V = ADC Vref, 0xFFF = 12bit adc, 110 = 11:1 voltage divider (10k:1k) * 10 for 0.1V
|
|
return ((uint32_t)src * batteryConfig->vbatscale * 33 + (0xFFF * 5)) / (0xFFF * 10);
|
|
}
|
|
|
|
#define BATTERY_SAMPLE_COUNT 8
|
|
|
|
void updateBatteryVoltage(void)
|
|
{
|
|
static uint16_t vbatSamples[BATTERY_SAMPLE_COUNT];
|
|
static uint8_t currentSampleIndex = 0;
|
|
uint8_t index;
|
|
uint16_t vbatSampleTotal = 0;
|
|
|
|
// store the battery voltage with some other recent battery voltage readings
|
|
vbatSamples[(currentSampleIndex++) % BATTERY_SAMPLE_COUNT] = vbatLatestADC = adcGetChannel(ADC_BATTERY);
|
|
|
|
// calculate vbat based on the average of recent readings
|
|
for (index = 0; index < BATTERY_SAMPLE_COUNT; index++) {
|
|
vbatSampleTotal += vbatSamples[index];
|
|
}
|
|
vbat = batteryAdcToVoltage(vbatSampleTotal / BATTERY_SAMPLE_COUNT);
|
|
}
|
|
|
|
batteryState_e calculateBatteryState(void)
|
|
{
|
|
if (vbat <= batteryCriticalVoltage) {
|
|
return BATTERY_CRITICAL;
|
|
}
|
|
if (vbat <= batteryWarningVoltage) {
|
|
return BATTERY_WARNING;
|
|
}
|
|
return BATTERY_OK;
|
|
}
|
|
|
|
void batteryInit(batteryConfig_t *initialBatteryConfig)
|
|
{
|
|
batteryConfig = initialBatteryConfig;
|
|
|
|
uint32_t i;
|
|
|
|
for (i = 0; i < BATTERY_SAMPLE_COUNT; i++) {
|
|
updateBatteryVoltage();
|
|
delay((32 / BATTERY_SAMPLE_COUNT) * 10);
|
|
}
|
|
|
|
unsigned cells = (vbat / batteryConfig->vbatmaxcellvoltage) + 1;
|
|
if(cells > 8) // something is wrong, we expect 8 cells maximum (and autodetection will be problematic at 6+ cells)
|
|
cells = 8;
|
|
batteryCellCount = cells;
|
|
batteryWarningVoltage = batteryCellCount * batteryConfig->vbatwarningcellvoltage;
|
|
batteryCriticalVoltage = batteryCellCount * batteryConfig->vbatmincellvoltage;
|
|
}
|
|
|
|
#define ADCVREF 3300 // in mV
|
|
int32_t currentSensorToCentiamps(uint16_t src)
|
|
{
|
|
int32_t millivolts;
|
|
|
|
millivolts = ((uint32_t)src * ADCVREF) / 4096;
|
|
millivolts -= batteryConfig->currentMeterOffset;
|
|
|
|
return (millivolts * 1000) / (int32_t)batteryConfig->currentMeterScale; // current in 0.01A steps
|
|
}
|
|
|
|
void updateCurrentMeter(int32_t lastUpdateAt, rxConfig_t *rxConfig, uint16_t deadband3d_throttle)
|
|
{
|
|
static int32_t amperageRaw = 0;
|
|
static int64_t mAhdrawnRaw = 0;
|
|
int32_t throttleOffset = (int32_t)rcCommand[THROTTLE] - 1000;
|
|
int32_t throttleFactor = 0;
|
|
|
|
switch(batteryConfig->currentMeterType) {
|
|
case CURRENT_SENSOR_ADC:
|
|
amperageRaw -= amperageRaw / 8;
|
|
amperageRaw += (amperageLatestADC = adcGetChannel(ADC_CURRENT));
|
|
amperage = currentSensorToCentiamps(amperageRaw / 8);
|
|
break;
|
|
case CURRENT_SENSOR_VIRTUAL:
|
|
amperage = (int32_t)batteryConfig->currentMeterOffset;
|
|
if(ARMING_FLAG(ARMED)) {
|
|
throttleStatus_e throttleStatus = calculateThrottleStatus(rxConfig, deadband3d_throttle);
|
|
if (throttleStatus == THROTTLE_LOW && feature(FEATURE_MOTOR_STOP))
|
|
throttleOffset = 0;
|
|
throttleFactor = throttleOffset + (throttleOffset * throttleOffset / 50);
|
|
amperage += throttleFactor * (int32_t)batteryConfig->currentMeterScale / 1000;
|
|
}
|
|
break;
|
|
case CURRENT_SENSOR_NONE:
|
|
amperage = 0;
|
|
break;
|
|
}
|
|
|
|
mAhdrawnRaw += (amperage * lastUpdateAt) / 1000;
|
|
mAhDrawn = mAhdrawnRaw / (3600 * 100);
|
|
}
|
|
|
|
uint8_t calculateBatteryPercentage(void)
|
|
{
|
|
return (((uint32_t)vbat - (batteryConfig->vbatmincellvoltage * batteryCellCount)) * 100) / ((batteryConfig->vbatmaxcellvoltage - batteryConfig->vbatmincellvoltage) * batteryCellCount);
|
|
}
|
|
|
|
uint8_t calculateBatteryCapacityRemainingPercentage(void)
|
|
{
|
|
uint16_t batteryCapacity = batteryConfig->batteryCapacity;
|
|
|
|
return constrain((batteryCapacity - constrain(mAhDrawn, 0, 0xFFFF)) * 100.0 / batteryCapacity , 0, 100);
|
|
}
|