Diff: motion.cpp

Revision:

0:00669618559e

Child:

1:8f545f45d899

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/motion.cpp	Thu Nov 24 16:37:00 2016 +0000
@@ -0,0 +1,62 @@
+#include "rtos.h"
+#include "pinmap.h"
+#include "FXOS8700Q.h"
+
+
+FXOS8700Q_acc acc(PTE25, PTE24, FXOS8700CQ_SLAVE_ADDR1);
+
+/* Constants and Declares */
+int numCount;
+int const MAX_NUM_COUNTS = 3;
+int const TIMING_PERIOD = 20; // Sensor polling interval
+
+uint8_t motion_exceeded_threshold = 0;
+
+void initialize_motion () {
+    acc.enable();
+}
+
+bool isMotionThresholdExceeded () {
+    return motion_exceeded_threshold;    
+}
+
+void resetMotionDetection () {
+    motion_exceeded_threshold = 0;
+}
+
+/**** Function: a_count
+ * return: void
+ * parameters: none
+ * A function called if motion detection interrupt flag is set.  Maintains
+ * a global counter and sets a timer to keep track of number of flags within
+ * timing limit.
+ */ 
+void a_count(void) {
+    /* step 1 increment the counter */
+    numCount++;
+    
+
+    if (numCount >= MAX_NUM_COUNTS) {
+        rled = !rled;   // toggle LEDs to show acceleration threshold reached
+        gled = !gled;   // toggle LEDS to show acceleration threshold reached
+        
+        motion_exceeded_threshold = 1;
+    }
+}
+
+void motion_thread () {
+    while(true) {
+
+        float xAcc, yAcc, zAcc;
+        acc.getX(&xAcc);
+        acc.getY(&yAcc);
+        acc.getZ(&zAcc);
+        float magtd = xAcc*xAcc + yAcc*yAcc + zAcc*zAcc;
+        
+        if (magtd > 3.0f) { // Greater than (1.5G of Accel.)^2
+            a_count();      // increment acceleration event counter
+        }
+
+        Thread::wait(TIMING_PERIOD); 
+    }   
+}
\ No newline at end of file