Sean Nagle / MMA8452Q_1

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of MMA8452Q by Stephen Licht

Files at this revision

API Documentation at this revision

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

MMA8452Q.cpp Show annotated file Show diff for this revision Revisions of this file
MMA8452Q.h Show annotated file Show diff for this revision Revisions of this file 
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();