Keisha Brathwaite / KBrat-SSD645-HW-8_1_MMA8451Q8

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Fork of MMA8451Q8 by Keisha Brathwaite

Files at this revision

API Documentation at this revision

Revision 9:1e7f9d65ad29, committed 2017-03-08

Comitter:
tisbrat
Date:
Wed Mar 08 03:59:56 2017 +0000
Parent:
8:65da360cf088
Commit message:
KBrat-SSD645-HW-8_1_lib

Changed in this revision

MMA8451Q8.cpp Show annotated file Show diff for this revision Revisions of this file
MMA8451Q8.h Show annotated file Show diff for this revision Revisions of this file 
--- a/MMA8451Q8.cpp	Mon Mar 06 17:39:43 2017 +0000
+++ b/MMA8451Q8.cpp	Wed Mar 08 03:59:56 2017 +0000
@@ -34,6 +34,14 @@
 #define MAX_8G            0x02
 
 #define GSCALING          1024.0
+//#define GSCALING          4096.0
+#define NUM_DATA            2
+#define ADDRESS_INDEX       0
+#define DATA_INDEX          1
+
+
+
+float gScaling[3] = {4095.0, 2048.0,1024.0}; //scaling for acceleration of gravity values
 
 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
     // activate the peripheral
@@ -49,24 +57,35 @@
     return who_am_i;
 }
 
-void MMA8451Q::standbyMode(void){
-    byte n;
-    uint8_t data[2] = {REG_CTRL_REG_1, 0x00};
-    n= readRegs(data, 2);
-    data[0] = XYZ_DATA_CFG;
-    data[1] = MAX_8G;
-    writeRegs(data, 2 , n);
+void MMA8451Q::standbyMode(){
+#define ACTIVEMASK 0x01
+    uint8_t registerData[1];
+    uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
+    
+    readRegs(REG_CTRL_REG_1, registerData, 1);
+    data[1] = registerData[0] & ~ACTIVEMASK;
+    writeRegs(data, NUM_DATA); //Standby Mode
     
 }
 
 void MMA8451Q::activeMode(){
+#define ACTIVEMASK 0x01
+    uint8_t registerData[1];
+    uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
+    
+    readRegs(REG_CTRL_REG_1, registerData, 1);
     data[0] = REG_CTRL_REG_1;
-    data[1] = 0x01;
-    writeRegs(data, 2, (readRegs(data, 2)));
+    data[1] = registerData[0] | ACTIVEMASK;
+    writeRegs(data, NUM_DATA); //Active Mode
 }
 
-void MMA8451Q::setGLimit() {   
+void MMA8451Q::setGLimit(int gSelect) {   
+    uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
+    gChosen = gSelect;
     standbyMode();
+    data[ADDRESS_INDEX] = XYZ_DATA_CFG;
+    data[DATA_INDEX] = gChosen;
+    writeRegs(data, 2);//change GLimit
     activeMode();
 }
 
@@ -93,6 +112,7 @@
     return (float(getAccAxis(REG_OUT_Z_MSB))/GSCALING);
 }
 
+
 void MMA8451Q::getAccAllAxis(float * res) {
     res[0] = getAccX();
     res[1] = getAccY();

--- a/MMA8451Q8.h	Mon Mar 06 17:39:43 2017 +0000
+++ b/MMA8451Q8.h	Wed Mar 08 03:59:56 2017 +0000
@@ -97,18 +97,23 @@
    * @param res array where acceleration data will be stored
    */
   void getAccAllAxis(float * res);
-
+  int16_t getAccAxis(uint8_t addr); //remove from private and make public
 
   I2C m_i2c;
   int m_addr;
+  int gChosen;
+  
+  /**allow user to set max g's**/
+  void setGLimit(int gSelect); 
+  void standbyMode();
+  void activeMode();
   void readRegs(int addr, uint8_t * data, int len);
   void writeRegs(uint8_t * data, int len);
-  void setGLimit(); 
-  void standbyMode();
-  void activeMode();
+  
+  
   
 private: 
-  int16_t getAccAxis(uint8_t addr);
+  
 
 };