diff options
Diffstat (limited to 'src/modules/land_detector/LandDetector.cpp')
-rw-r--r-- | src/modules/land_detector/LandDetector.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/modules/land_detector/LandDetector.cpp b/src/modules/land_detector/LandDetector.cpp new file mode 100644 index 000000000..a39e53818 --- /dev/null +++ b/src/modules/land_detector/LandDetector.cpp @@ -0,0 +1,77 @@ +#include "LandDetector.h" +#include <unistd.h> //usleep +#include <drivers/drv_hrt.h> + +LandDetector::LandDetector() : + _landDetectedPub(-1), + _landDetected({0, false}), + _taskShouldExit(false), + _taskIsRunning(false) +{ + //Advertise the first land detected uORB + _landDetected.timestamp = hrt_absolute_time(); + _landDetected.landed = false; + _landDetectedPub = orb_advertise(ORB_ID(vehicle_land_detected), &_landDetected); +} + +LandDetector::~LandDetector() +{ + _taskShouldExit = true; + close(_landDetectedPub); +} + +void LandDetector::shutdown() +{ + _taskShouldExit = true; +} + +void LandDetector::start() +{ + //Make sure this method has not already been called by another thread + if(isRunning()) { + return; + } + + //Task is now running, keep doing so until shutdown() has been called + _taskIsRunning = true; + _taskShouldExit = false; + while(isRunning()) { + + bool landDetected = update(); + + //Publish if land detection state has changed + if (_landDetected.landed != landDetected) { + _landDetected.timestamp = hrt_absolute_time(); + _landDetected.landed = landDetected; + + /* publish the land detected broadcast */ + orb_publish(ORB_ID(vehicle_land_detected), _landDetectedPub, &_landDetected); + } + + //Limit loop rate + usleep(1000000 / LAND_DETECTOR_UPDATE_RATE); + } + + _taskIsRunning = false; + _exit(0); +} + +bool LandDetector::orb_update(const struct orb_metadata *meta, int handle, void *buffer) +{ + bool newData = false; + + //Check if there is new data to grab + if (orb_check(handle, &newData) != OK) { + return false; + } + + if (!newData) { + return false; + } + + if (orb_copy(meta, handle, buffer) != OK) { + return false; + } + + return true; +} |