Revision 1:03f0a25c5a86, committed 2014-05-22

Comitter:

donoman

Date:

Thu May 22 18:58:25 2014 +0000

Parent:

0:75c161b9fc38

Commit message:

Step logging working, but double counting;

Changed in this revision

--- a/main.cpp	Wed Apr 30 00:44:56 2014 +0000
+++ b/main.cpp	Thu May 22 18:58:25 2014 +0000
@@ -1,6 +1,7 @@
 #include "mbed.h"
 #include "MMA8451Q_tb.h"
 #include "SDFileSystem.h"
+#include "math.h"
  
  
 #define MMA8451_I2C_ADDRESS (0x1d<<1)
@@ -13,26 +14,51 @@
 int main(void) {
     
 //Initialize
-    int now; //used for timestamping  
+    int now;                //used for timestamping  
+    int counter = 0;        //used for step counting
+    int step_flag = 0;      //used to sense transition into step
+    float threshold = 1.43; //tunable in g's [m/s^2]
+    float mag = 0; 
+    float x = 0;
+    float y = 0;
+    float z = 0;
     timer.start(); 
     MMA8451Q acc(PTE25, PTE24, MMA8451_I2C_ADDRESS);
     printf("MMA8451 ID: %d\n", acc.getWhoAmI());
 
 //Open File
-    mkdir("/sd/mydir", 0777);
-    FILE *fp = fopen("/sd/mydir/sdtest.txt", "a");
-    if(fp == NULL) {
-        error("Could not open file for write\n");
-    }
+    //mkdir("/sd/mydir", 0777);
+    //FILE *fp = fopen("/sd/mydir/sdtest.txt", "a");
+    //if(fp == NULL) {
+    //    error("Could not open file for write\n");
+    //}
 
-    for(int i=0; i<2000; i++) {
+    while(1){
+    //for(int i=0; i<2000; i++) {
         pinout = !pinout;
         now = timer.read_ms();
         acc.fastRead(&acc_all[0]);
-       
+        x = acc_all[0];
+        y = acc_all[1];
+        z = acc_all[2];
+        
+        mag = sqrt(x*x + y*y + z*z);
        //Print to file
-        fprintf(fp, "%d, %f,%f,%f\n",now, acc_all[0],acc_all[1],acc_all[2]);
+     //   fprintf(fp, "%d, %f,%f,%f\n",now, acc_all[0],acc_all[1],acc_all[2]);
+        
+    //}
+    //fclose(fp);
+   // pc.printf("mag: %f\n", mag);
+        if (mag > threshold){
+            if (step_flag == 0){
+                counter++;
+                pc.printf("step_count:%d mag: %f\n", counter, mag);
+            }  
+            step_flag = 1;
+        }
+        else {
+            step_flag = 0;
+            }  
         
     }
-    fclose(fp);
 }