Revision 1:a63e41016132, committed 2017-12-07

Comitter:

rsean10

Date:

Thu Dec 07 15:23:07 2017 +0000

Parent:

0:b3305e3c9e73

Commit message:

this works i think;

Changed in this revision

diff -r b3305e3c9e73 -r a63e41016132 MMA8452Q.cpp
--- a/MMA8452Q.cpp	Thu Oct 19 12:53:02 2017 +0000
+++ b/MMA8452Q.cpp	Thu Dec 07 15:23:07 2017 +0000
@@ -30,6 +30,7 @@
     standby();
     setScale(DEFAULT_FSR);
     setODR(DEFAULT_ODR);
+    //freefall();     //enable freefall
     active();
 
     return true;
@@ -73,6 +74,16 @@
     writeRegister(REG_CTRL_REG1, c);    // Write back to CONTROL register
 }
 
+//Enabe Freefall interrupt
+void MMA8452Q::freefall(uint8_t interrupt,uint8_t threshold)
+{
+    writeRegister(FF_CONFIG,0x38);              // Configure for freefall
+    writeRegister(FF_THS,threshold);            // Configure for threshold <"thresh"g
+    writeRegister(FF_COUNT,0x64);               // Set debounce counter for 125ms
+    writeRegister(REG_CTRL_REG4,0x04);          // enable interrupt in control register
+    writeRegister(REG_CTRL_REG5,interrupt);     // set interrupt to hardware pin 
+}
+
 // Read X registers
 float MMA8452Q::readX()
 {

diff -r b3305e3c9e73 -r a63e41016132 MMA8452Q.h
--- a/MMA8452Q.h	Thu Oct 19 12:53:02 2017 +0000
+++ b/MMA8452Q.h	Thu Dec 07 15:23:07 2017 +0000
@@ -17,6 +17,12 @@
 #define REG_WHO_AM_I        0x0D
 #define REG_XYZ_DATA_CFG    0x0E
 #define REG_CTRL_REG1       0x2A
+#define REG_CTRL_REG4       0X2D
+#define FF_CONFIG           0X15
+#define FF_THS              0X17
+#define FF_COUNT            0X18
+#define FF_SRC              0X16
+#define REG_CTRL_REG5       0X2E
 
 // WHO_AM_I check
 #define FACTORY_ID          0x2A
@@ -39,6 +45,8 @@
 // Init values
 #define DEFAULT_FSR         SCALE_2G
 #define DEFAULT_ODR         ODR_800HZ
+#define DEFAULT_PIN         0X04
+#define DEFAULT_THRESH      0x03
 
 
 // Class declaration
@@ -53,6 +61,7 @@
         void setODR(uint8_t odr);
         void standby();
         void active();
+        void freefall(uint8_t interrupt,uint8_t threshold);
         float readX();
         float readY();
         float readZ();