Diff: MMA8451Q8.cpp

Revision:

9:1e7f9d65ad29

Parent:

8:65da360cf088

--- 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();