Revision 4:489573e65d47, committed 2013-10-16

Comitter:

nherriot

Date:

Wed Oct 16 14:12:28 2013 +0000

Parent:

3:6d888ac31d2c

Child:

5:34fa5db89a3a

Commit message:

A test utility for the mma8452 accelerometer.

Changed in this revision

--- a/MMA8452.lib	Tue Oct 08 15:25:46 2013 +0000
+++ b/MMA8452.lib	Wed Oct 16 14:12:28 2013 +0000
@@ -1,1 +1,1 @@
-MMA8452#ef026bf28798
+http://mbed.org/users/nherriot/code/MMA8452/#ffb0b1650ca2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/helperFunctions.cpp	Wed Oct 16 14:12:28 2013 +0000
@@ -0,0 +1,24 @@
+
+#include "helperFunctions.h"
+
+//Serial pc(USBTX, USBRX);
+
+// This function will print a 7 bit char as a binary number on the screen
+void printbincharpad(char c)
+{
+    for (int i = 7; i >= 0; --i)
+    {
+        putchar( (c & (1 << i)) ? '1' : '0' );
+        if (i==4){putchar(':');}
+    }
+    
+}
+
+// This function will take two characters and print formatted as a binary number on the screen
+void print2bytebinchar(char *buffer)
+{
+    printbincharpad(buffer[0]);
+    printf(" -- ");
+    printbincharpad(buffer[1]);
+    printf("\n");
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/helperFunctions.h	Wed Oct 16 14:12:28 2013 +0000
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include "mbed.h"
+
+// This function will print a 7 bit char as a binary number on the screen
+void printbincharpad(char c);
+
+// This function will take two characters and print formatted as a binary number on the screen
+void print2bytebinchar(char *buffer);
+

--- a/main.cpp	Tue Oct 08 15:25:46 2013 +0000
+++ b/main.cpp	Wed Oct 16 14:12:28 2013 +0000
@@ -1,7 +1,7 @@
 #include "mbed.h"
 //#include <bitset>
 #include "MMA8452.h"
-
+#include "helperFunctions.h"
 
 // I2C i2c(p28,p27);
 Accelerometer_MMA8452 accelerometer(p28, p27, 40000);
@@ -12,6 +12,14 @@
 DigitalOut led2(LED2);
 DigitalOut led3(LED3);
 
+
+
+
+
+
+
+
+
 int main() {
     led1 = 0;
     led2 = 0;
@@ -19,11 +27,13 @@
     char cmd[6];
     char add[1];
     char init[2];
-    add[0] = OUT_X_MSB;                  // x-axis register
-    init[0] = CTRL_REG_1;                 // control register 1
-    init[1] = 0x01;                 // set to active
+    add[0] = OUT_X_MSB;                                     // x-axis register
+    init[0] = CTRL_REG_1;                                   // control register 1
+    init[1] = 0x01;                                         // sets the accelerometer to active
     int number=0;
-    //i2c.frequency(40000);
+    char x_buffer[2];                                       // used to store a bit array from the x axis acclerometer 
+    char y_buffer[2];                                       // this represents the raw data value from the acclerometer
+    char z_buffer[2];                                       // which is converted from 12bit to 16bit value 2s compliment.
 
     // just playing with address values
     char mcu_address = 0x00;
@@ -37,9 +47,32 @@
     //init
     //set active mode
     pc.printf("\nWriting to master register\n"); 
-    // while(i2c.write(mcu_address,init,2));
-    for (int i=0;i<=400;i++)
+    for (int i=0;i<=50;i++)
+        {
+        int deviceSystemMode= 0;
+        if (accelerometer.get_SystemMode(deviceSystemMode)==0)
+        {
+            pc.printf("\nGot the device System Mode - device system mode which is: 0x%x \n", deviceSystemMode);
+        }
+        else
         {
+            pc.printf("\nFailed to get the device system mode. The id is set as: 0x%x ", deviceSystemMode);
+        
+        }
+        
+        int deviceStatus = 0;
+        if (accelerometer.get_Status(deviceStatus)==0)
+        {
+            pc.printf("\nGot the device Status - device status which is: 0x%x \n", deviceStatus);
+        }
+        else
+        {
+            pc.printf("\nFailed to get the device status. The id is set as: 0x%x ", deviceStatus);
+        
+        }
+        
+        
+        
         if (accelerometer.activate()==0)
         {
             led1 = 1;
@@ -47,27 +80,132 @@
             led3 = 1;
             pc.printf("\nActivated chip\n"); 
             wait(0.5);
-            /*int x=0;int y=0;int z=0;
-            for(int i=0; i<20;i++)
+            
+            //int x=0;//int y=0;int z=0;
+            for(int i=0; i<5;i++)
             {
-                z = accelerometer.read_z();
-                x = accelerometer.read_x();
-                y = accelerometer.read_y();
+                
+                
+                if (accelerometer.read_x_raw(x_buffer)==0)
+                {
+                    //pc.printf("\nThe x-axis LSB is: 0x%x", x);
+                    pc.printf("The value of my x_buffer[0] in digit form is: %d  in hex:  0x%x  \n",x_buffer[0],x_buffer[0]);
+                    pc.printf("The value of my x_buffer[1] in digit form is: %d  in hex:  0x%x  \n",x_buffer[1],x_buffer[1]);
+                    print2bytebinchar(x_buffer);
+                    
+                }
+                else
+                {
+                    pc.printf("\nError - could not get xaxis LSB! ....\n");
+                }
+                
+                
                 
-                pc.printf("\nAxis acceleration in x is: %i  , y is: %i, z is %z \n", x,y,z);
-                wait(3);
-            }
-            */       
+                if (accelerometer.read_y_raw(y_buffer)==0)
+                {
+                    //pc.printf("\nThe x-axis LSB is: 0x%x", x);
+                    pc.printf("The value of my y_buffer[0] in digit form is: %d  in hex:  0x%x  \n",y_buffer[0],y_buffer[0]);
+                    pc.printf("The value of my y_buffer[1] in digit form is: %d  in hex:  0x%x  \n",y_buffer[1],y_buffer[1]);
+                    print2bytebinchar(y_buffer);
+                    
+                }
+                else
+                {
+                    pc.printf("\nError - could not get yaxis LSB! ....\n");
+                }
+                
+
+                
+                if (accelerometer.read_z_raw(z_buffer)==0)
+                {
+                    //pc.printf("\nThe x-axis LSB is: 0x%x", x);
+                    pc.printf("The value of my z_buffer[0] in digit form is: %d  in hex:  0x%x  \n",z_buffer[0],z_buffer[0]);
+                    pc.printf("The value of my z_buffer[1] in digit form is: %d  in hex:  0x%x  \n",z_buffer[1],z_buffer[1]);
+                    print2bytebinchar(y_buffer);
+                    
+                }
+                else
+                {
+                    pc.printf("\nError - could not get zaxis LSB! ....\n");
+                }
+                
+
+                
+                //y = accelerometer.read_y();
+                
+                //pc.printf("\nAxis acceleration in x is: %i  , y is: %i, z is %z \n", x,y,z);
+                wait(1);
+            }      
         }
         else
         {
             pc.printf("Could not activate the chip\n");
         }
-        pc.printf("In loop %d, of repeated initialisation.\n",i); i++;
+        
+        
+        int deviceID= 0;
+        if (accelerometer.get_DeviceID(deviceID)==0)
+        {
+            pc.printf("\nGot the who am I - device id which is: 0x%x \n", deviceID);
+        }
+        else
+        {
+            pc.printf("\nFailed to get the device id. The id is set as: 0x%x ", deviceID);
+        
+        }
+        
+        if (accelerometer.get_Status(deviceStatus)==0)
+        {
+            pc.printf("\nGot the device Status - device system mode which is: 0x%x \n", deviceSystemMode);
+        }
+        else
+        {
+            pc.printf("\nFailed to get the device system mode. The id is set as: 0x%x ", deviceSystemMode);
+        
+        }
+
+        wait(3);
+        
+        pc.printf("In loop %d, of repeated initialisation.\n",i); 
+        i++;
      }   
     
     //get analog data
-    pc.printf("Getting analog data");
+    pc.printf("Set system into standby mode.........");
+    
+    if(accelerometer.standby()==0)
+    {
+        pc.printf("Device set into standby...\n");
+    }
+    else
+    {
+        pc.printf("Device failed to set into standby...\n");
+    }
+    int deviceSystemMode = 0;
+    pc.printf("\nGet system mode, it should now be standby! ...\n");
+    if (accelerometer.get_SystemMode(deviceSystemMode)==0)
+    {
+        pc.printf("\nGot the device System Mode - device system mode which is: 0x%x \n", deviceSystemMode);
+    }
+    else
+    {
+        pc.printf("\nFailed to get the device system mode. The id is set as: 0x%x ", deviceSystemMode);
+        
+    }
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
     /*
     while(1) 
     {