diff options
| author | Keith Packard <keithp@keithp.com> | 2009-11-14 22:17:24 -0800 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2009-11-14 22:17:24 -0800 |
| commit | 1c654a9369294c9b8066c33f91161d8005b96680 (patch) | |
| tree | 10ec090548e98c5a18db47499f9889aafce83014 /src | |
| parent | 03092d1a72a9651711e22c58dca6d6aba5705c5e (diff) | |
Loosen tolerances for main->landed transition
Detecting that the rocket has landed is required for the system to
flush the eeprom log and re-enable the RDF beacon. This patch changes
the landed state entry requirements for the accelerometer to require
only that the accelerometer stay within a quarter of a g (down from
1/10g) and changes the testing interval from 20 seconds to 5
seconds.
The requirement that the barometric altitude be within 1000m of the
launch altitude and that the barometer change by no more than 0.05kPa
are unchanged.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/ao_flight.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/src/ao_flight.c b/src/ao_flight.c index f50491d9..f57573d0 100644 --- a/src/ao_flight.c +++ b/src/ao_flight.c @@ -75,10 +75,10 @@ __pdata int16_t ao_accel_2g; /* convert m/s to velocity count */ #define VEL_MPS_TO_COUNT(mps) (((int32_t) (((mps) / GRAVITY) * (AO_HERTZ/2))) * (int32_t) ao_accel_2g) -#define ACCEL_G 265 -#define ACCEL_NOSE_UP (ao_accel_2g / 4) +#define ACCEL_NOSE_UP (ao_accel_2g >> 2) #define ACCEL_BOOST ao_accel_2g -#define ACCEL_INT_LAND (ACCEL_G / 10) +#define ACCEL_COAST (ao_accel_2g >> 3) +#define ACCEL_INT_LAND (ao_accel_2g >> 3) #define ACCEL_VEL_MACH VEL_MPS_TO_COUNT(200) #define ACCEL_VEL_BOOST VEL_MPS_TO_COUNT(5) @@ -132,7 +132,7 @@ __xdata int32_t ao_raw_accel_sum, ao_raw_pres_sum; /* Landing is detected by getting constant readings from both pressure and accelerometer * for a fairly long time (AO_INTERVAL_TICKS) */ -#define AO_INTERVAL_TICKS AO_SEC_TO_TICKS(20) +#define AO_INTERVAL_TICKS AO_SEC_TO_TICKS(5) #define abs(a) ((a) < 0 ? -(a) : (a)) @@ -301,7 +301,7 @@ ao_flight(void) * deceleration, or by waiting until the maximum burn duration * (15 seconds) has past. */ - if (ao_flight_accel > ao_ground_accel + (ACCEL_G >> 2) || + if (ao_flight_accel > ao_ground_accel + ACCEL_COAST || (int16_t) (ao_flight_tick - ao_launch_tick) > BOOST_TICKS_MAX) { ao_flight_state = ao_flight_fast; @@ -432,20 +432,20 @@ ao_flight(void) ao_interval_end = ao_flight_tick + AO_INTERVAL_TICKS; ao_interval_cur_min_pres = ao_interval_cur_max_pres = ao_flight_pres; ao_interval_cur_min_accel = ao_interval_cur_max_accel = ao_flight_accel; - } - if ((uint16_t) (ao_interval_max_accel - ao_interval_min_accel) < (uint16_t) ACCEL_INT_LAND && - ao_flight_pres > ao_ground_pres - BARO_LAND && - (uint16_t) (ao_interval_max_pres - ao_interval_min_pres) < (uint16_t) BARO_INT_LAND) - { - ao_flight_state = ao_flight_landed; + if ((uint16_t) (ao_interval_max_accel - ao_interval_min_accel) < (uint16_t) ACCEL_INT_LAND && + ao_flight_pres > ao_ground_pres - BARO_LAND && + (uint16_t) (ao_interval_max_pres - ao_interval_min_pres) < (uint16_t) BARO_INT_LAND) + { + ao_flight_state = ao_flight_landed; - /* turn off the ADC capture */ - ao_timer_set_adc_interval(0); - /* Enable RDF beacon */ - ao_rdf_set(1); + /* turn off the ADC capture */ + ao_timer_set_adc_interval(0); + /* Enable RDF beacon */ + ao_rdf_set(1); - ao_wakeup(DATA_TO_XDATA(&ao_flight_state)); + ao_wakeup(DATA_TO_XDATA(&ao_flight_state)); + } } break; case ao_flight_landed: |