Stanley Cohen / MMA8451Q8b

For experimentation NMHU Ambient computing

Dependents:   KL46z_single_tap_empty_DE_4_1_PROJECT1B_wInterrupts KL46z_single_tap_empty_DE_4_1_PROJECT1D KL46z_single_tap_generic RAHUL_KL46z_single_tap_generic_copy ... more

Fork of MMA8451Q8a by Stanley Cohen

Files at this revision

API Documentation at this revision

Revision 12:12b18fdb72f7, committed 2016-02-22

Comitter:
scohennm
Date:
Mon Feb 22 16:54:40 2016 +0000
Parent:
9:3229b6691c89
Commit message:
updated active/standby mode change

Changed in this revision

MMA8451Q8g.cpp Show annotated file Show diff for this revision Revisions of this file
MMA8451Q8g.h Show annotated file Show diff for this revision Revisions of this file 
diff -r 3229b6691c89 -r 12b18fdb72f7 MMA8451Q8g.cpp
--- a/MMA8451Q8g.cpp	Mon Feb 09 20:05:35 2015 +0000
+++ b/MMA8451Q8g.cpp	Mon Feb 22 16:54:40 2016 +0000
@@ -56,31 +56,45 @@
     readRegs(REG_WHO_AM_I, &who_am_i, 1);
     return who_am_i;
 }
+void MMA8451Q::setStandbyMode(){
+#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); // put in standby
+}
+void MMA8451Q::setActiveMode(){
+#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); // put in standby
+}
+
 void MMA8451Q::setGLimit(int gSelect) {   
     uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00};
     gChosen = gSelect;
-    writeRegs(data, NUM_DATA); // put in standby
+    setStandbyMode();
     data[ADDRESS_INDEX ] = XYZ_DATA_CFG;
     data[DATA_INDEX] = gChosen;
     writeRegs(data, 2);// change g limit
-    data[ADDRESS_INDEX ] = REG_CTRL_REG_1;
-    data[DATA_INDEX] = 0x01;
-    writeRegs(data, 2); // make active
+    setActiveMode(); // make active
 }
 // add Pusle configuration register access
 // Also add function prototype to .h file
 void MMA8451Q::setPulseConfiguration(uint8_t latch,uint8_t axisSet) {
     uint8_t configBits;   
-    uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00}; // put in standby mode
+    uint8_t data[NUM_DATA] = {REG_PULSE_CFG, 0x00}; // put in standby mode
 // set up configuration bits.
     configBits = latch | axisSet;
-    writeRegs(data, NUM_DATA); // put in standby
-    data[ADDRESS_INDEX ] = REG_PULSE_CFG;
+    setStandbyMode(); // put in standby
     data[DATA_INDEX] = configBits;
     writeRegs(data, NUM_DATA);
-    data[ADDRESS_INDEX ] = REG_CTRL_REG_1; // put back in active mode
-    data[DATA_INDEX] = 0x01;
-    writeRegs(data, 2); // make active
+    setActiveMode(); // make active
 }
 
 // Make a genric register updater for those commands that need to put the 
@@ -90,13 +104,11 @@
     uint8_t data[NUM_DATA] = {REG_CTRL_REG_1, 0x00}; // put in standby mode
 // set up configuration bits.
     configBits = regData;
-    writeRegs(data, NUM_DATA); // put in standby
+    setStandbyMode(); // put in standby
     data[ADDRESS_INDEX ] = regAddress;
     data[DATA_INDEX] = configBits;
     writeRegs(data, NUM_DATA);
-    data[ADDRESS_INDEX ] = REG_CTRL_REG_1; // put back in active mode
-    data[DATA_INDEX] = 0x01;
-    writeRegs(data, 2); // make active
+    setActiveMode(); // put back in active mode
 }
 
 float MMA8451Q::getAccX() {

diff -r 3229b6691c89 -r 12b18fdb72f7 MMA8451Q8g.h
--- a/MMA8451Q8g.h	Mon Feb 09 20:05:35 2015 +0000
+++ b/MMA8451Q8g.h	Mon Feb 22 16:54:40 2016 +0000
@@ -120,7 +120,8 @@
   put in standby to update
   **/
   void setRegisterInStandby(uint8_t regAddress,uint8_t regData);
-  
+  void setStandbyMode();
+  void setActiveMode();
   void readRegs(int addr, uint8_t * data, int len);
   void writeRegs(uint8_t * data, int len);