diff options
| author | Randy Mackay <rmackay9@yahoo.com> | 2015-03-18 20:05:45 +0900 |
|---|---|---|
| committer | Randy Mackay <rmackay9@yahoo.com> | 2015-03-19 12:09:31 +0900 |
| commit | 23075f6dab4fc3584cd17eed44196169488af626 (patch) | |
| tree | f43d04fa7aa229d0920862583e75b95f52f27965 | |
| parent | f1fa57ff4297f50ccfbee86344de02554f641a7f (diff) | |
| download | px4-firmware-23075f6dab4fc3584cd17eed44196169488af626.tar.gz px4-firmware-23075f6dab4fc3584cd17eed44196169488af626.tar.bz2 px4-firmware-23075f6dab4fc3584cd17eed44196169488af626.zip | |
batt_smbus: calculate current discharged
| -rw-r--r-- | src/drivers/batt_smbus/batt_smbus.cpp | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/src/drivers/batt_smbus/batt_smbus.cpp b/src/drivers/batt_smbus/batt_smbus.cpp index a958fc60d..4fd82de49 100644 --- a/src/drivers/batt_smbus/batt_smbus.cpp +++ b/src/drivers/batt_smbus/batt_smbus.cpp @@ -84,6 +84,7 @@ #define BATT_SMBUS_ADDR 0x0B ///< I2C address #define BATT_SMBUS_TEMP 0x08 ///< temperature register #define BATT_SMBUS_VOLTAGE 0x09 ///< voltage register +#define BATT_SMBUS_REMAINING_CAPACITY 0x0f ///< predicted remaining battery capacity as a percentage #define BATT_SMBUS_DESIGN_CAPACITY 0x18 ///< design capacity register #define BATT_SMBUS_DESIGN_VOLTAGE 0x19 ///< design voltage register #define BATT_SMBUS_SERIALNUM 0x1c ///< serial number register @@ -179,6 +180,7 @@ private: orb_advert_t _batt_topic; ///< uORB battery topic orb_id_t _batt_orb_id; ///< uORB battery topic ID uint64_t _start_time; ///< system time we first attempt to communicate with battery + uint16_t _batt_design_capacity; ///< battery's design capacity in mAh (0 means unknown) }; namespace @@ -197,7 +199,8 @@ BATT_SMBUS::BATT_SMBUS(int bus, uint16_t batt_smbus_addr) : _reports(nullptr), _batt_topic(-1), _batt_orb_id(nullptr), - _start_time(0) + _start_time(0), + _batt_design_capacity(0) { // work_cancel in the dtor will explode if we don't do this... memset(&_work, 0, sizeof(_work)); @@ -263,7 +266,7 @@ BATT_SMBUS::test() if (updated) { if (orb_copy(ORB_ID(battery_status), sub, &status) == OK) { - warnx("V=%4.2f C=%4.2f", status.voltage_v, status.current_a); + warnx("V=%4.2f C=%4.2f DismAh=%4.2f", (float)status.voltage_v, (float)status.current_a, (float)status.discharged_mah); } } @@ -371,6 +374,24 @@ BATT_SMBUS::cycle() new_report.current_a = -(float)((int32_t)((uint32_t)buff[3] << 24 | (uint32_t)buff[2] << 16 | (uint32_t)buff[1] << 8 | (uint32_t)buff[0])) / 1000.0f; } + // read battery design capacity + if (_batt_design_capacity == 0) { + usleep(1); + if (read_reg(BATT_SMBUS_DESIGN_CAPACITY, tmp) == OK) { + _batt_design_capacity = tmp; + } + } + + // read remaining capacity + if (_batt_design_capacity > 0) { + usleep(1); + if (read_reg(BATT_SMBUS_REMAINING_CAPACITY, tmp) == OK) { + if (tmp < _batt_design_capacity) { + new_report.discharged_mah = _batt_design_capacity - tmp; + } + } + } + // publish to orb if (_batt_topic != -1) { orb_publish(_batt_orb_id, _batt_topic, &new_report); |