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AP_NavEKF2: Fix bug in reporting of vertical position reset 

Fixes a bug that allows the last reported reset time to to wind back and an out of date reset delta to be reported if a switch to a core that has previously been reset occurs.
Allows multiple consumers provided they access on the same frame.
This commit is contained in:
priseborough 2016-11-30 11:03:13 +11:00 committed by Randy Mackay
parent 7f347e39dd
commit 665ba1c009
1 changed files with 15 additions and 8 deletions
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23
libraries/AP_NavEKF2/AP_NavEKF2.cpp
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@ -1304,27 +1304,34 @@ const char *NavEKF2::prearm_failure_reason(void) const
return core[primary].prearm_failure_reason();
}
// return the amount of vertical position change due to the last reset in metres
// returns the time of the last reset or 0 if no reset has ever occurred
// Returns the amount of vertical position change due to the last reset or core switch in metres
// Returns the time of the last reset or 0 if no reset or core switch has ever occurred
// Where there are multiple consumers, they must access this function on the same frame as each other
uint32_t NavEKF2::getLastPosDownReset(float &posDelta)
{
if (!core) {
return 0;
}
// Record last time controller got the position reset
pos_down_reset_data.last_function_call = imuSampleTime_us / 1000;
posDelta = 0.0f;
uint32_t lastPosReset_ms = 0;
// Do the conversion to msec in one place
uint32_t now_time_ms = imuSampleTime_us / 1000;
// The last time we switched to the current primary core is the first reset event
uint32_t lastPosReset_ms = pos_down_reset_data.last_primary_change;
// There has been a change in the primary core that the controller has not consumed
if (pos_down_reset_data.core_changed) {
// allow for multiple consumers on the same frame
if (pos_down_reset_data.core_changed || pos_down_reset_data.last_function_call == now_time_ms) {
posDelta = pos_down_reset_data.core_delta;
lastPosReset_ms = pos_down_reset_data.last_primary_change;
pos_down_reset_data.core_changed = false;
}
// There has been a reset inside the core since we switched
// Record last time controller got the position reset
pos_down_reset_data.last_function_call = now_time_ms;
// There has been a reset inside the core since we switched so update the time and delta
float tempPosDelta;
uint32_t lastCorePosReset_ms = core[primary].getLastPosDownReset(tempPosDelta);
if (lastCorePosReset_ms > lastPosReset_ms) {