Revision 4:fdf14a259af8, committed 2013-05-30

Comitter:

clemente

Date:

Thu May 30 07:27:24 2013 +0000

Parent:

3:a2f1752add9a

Child:

5:9edec5ee8bf4

Commit message:

Added and tested the data acquisition using Interrupt. Added code for Altimeter trigger Interrupt but not yet tested.

Changed in this revision

--- a/MPL3115A2.cpp	Wed May 29 11:56:52 2013 +0000
+++ b/MPL3115A2.cpp	Thu May 30 07:27:24 2013 +0000
@@ -3,6 +3,7 @@
 #define REG_WHO_AM_I        0x0C        // return 0xC4 by default
 #define REG_STATUS          0x00
 #define REG_CTRL_REG_1      0x26
+#define REG_CTRL_REG_3      0x28
 #define REG_CTRL_REG_4      0x29
 #define REG_CTRL_REG_5      0x2A
 #define REG_PRESSURE_MSB    0x01        // 3 byte pressure data
@@ -36,6 +37,11 @@
 MPL3115A2::MPL3115A2(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
     MPL3115A2_mode = BAROMETRIC_MODE;
     MPL3115A2_oversampling = OVERSAMPLE_RATIO_1;
+    //
+    user1_fptr = NULL;
+    user2_fptr = NULL;
+    MPL3115A2_Int1.fall( NULL);
+    MPL3115A2_Int2.fall( NULL);
 }
 
 void MPL3115A2::Reset( void)
@@ -55,21 +61,18 @@
     unsigned char dt[5];
     unsigned char data[2];
     
+    // Soft Reset
     Reset();
     
-    /*
-    ** Read contents of CTRL_REG_1
-    ** Clear SBYB mask while holding all other values of CTRL_REG_1.
-    ** To put part into Standby mode
-    */
     Standby();
     
-    /*
-    ** Clear all interrupts by reading the output registers.
-    ** Activate sensor in Altimeter mode.
-    */
+    // Clear all interrupts by reading the output registers.
     readRegs( REG_ALTIMETER_MSB, &dt[0], 5);
     getStatus();
+    // Configure INT active low and pullup
+    data[0] = REG_CTRL_REG_3;
+    data[1] = 0x00;
+    writeRegs(data, 2);    
     // Enable Interrupt fot data ready
     data[0] = REG_CTRL_REG_4;
     data[1] = 0x80;
@@ -78,12 +81,20 @@
     data[0] = REG_CTRL_REG_5;
     data[1] = 0x00;
     writeRegs(data, 2);    
+    data[0] = REG_PT_DATA_CFG;
+    data[1] = 0x07;
+    writeRegs(data, 2);    
 
-    /*
-    ** Configure the OverSampling rate, Altimeter mode and set the sensor Active
-    */
+    // Configure the OverSampling rate, Altimeter/Barometer mode and set the sensor Active
     data[0] = REG_CTRL_REG_1;
-    data[1] = 0x81 | (OS<<3);
+    data[1] = (OS<<3);
+    //
+    if (MPL3115A2_mode == BAROMETRIC_MODE)
+        data[1] &= 0x7F;
+    else
+        data[1] |= 0x80;
+    //
+    data[1] |= 0x01; 
     writeRegs(data, 2);    
 
     user2_fptr = fptr;
@@ -115,14 +126,16 @@
     getStatus();
 
     // Write Target and Window Values
-    data[0] = (level<<8);
-    data[1] = (level&0xFF);
-    writeRegs( data, 2);
+    dt[0] = REG_P_TGT_MSB;
+    dt[1] = (level>>8);
+    dt[2] = (level&0xFF);
+    writeRegs( dt, 3);
     
     // Window values are zero
-    data[0] = 0;
-    data[1] = 0;
-    writeRegs( data, 2);
+    dt[0] = REG_P_WND_MSB;
+    dt[1] = 0;
+    dt[2] = 0;
+    writeRegs( dt, 3);
 
     // Enable Pressure Threshold interrupt
     data[0] = REG_CTRL_REG_4;
@@ -132,8 +145,13 @@
     data[0] = REG_CTRL_REG_5;
     data[1] = 0x08;
     writeRegs( data, 2);
-
-    Active();
+    data[0] = REG_PT_DATA_CFG;
+    data[1] = 0x07;
+    writeRegs(data, 2);    
+    // Configure the OverSampling rate, Altimeter mode and set the sensor Active
+    data[0] = REG_CTRL_REG_1;
+    data[1] = 0x81 | (MPL3115A2_oversampling<<3);    
+    writeRegs(data, 2);    
 
     user1_fptr = fptr;
     MPL3115A2_Int1.fall( this, &MPL3115A2::AltitudeTrg_IRQ);

--- a/MPL3115A2.h	Wed May 29 11:56:52 2013 +0000
+++ b/MPL3115A2.h	Thu May 30 07:27:24 2013 +0000
@@ -145,9 +145,9 @@
     void DataReady( void(*fptr)(void), unsigned char OS);
 
     /**
-    * Configure the sensor to streaming data using Interrupt
+    * Configure the sensor to generate an Interrupt crossing the center threshold
     *
-    * @param user functin callback, oversampling values. See MPL3115A2.h
+    * @param user functin callback, level in meter
     * @return none
     */
     void AltitudeTrigger( void(*fptr)(void), unsigned short level);