Revision 3:b1f5d765d066, committed 2016-08-30

Comitter:

faithcerebral

Date:

Tue Aug 30 13:37:28 2016 +0000

Parent:

2:41dd6f412728

Commit message:

to

Changed in this revision

--- a/main.cpp	Mon Apr 07 19:36:26 2014 +0000
+++ b/main.cpp	Tue Aug 30 13:37:28 2016 +0000
@@ -4,35 +4,144 @@
 SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); // MOSI, MISO, SCK, CS
 Serial pc(USBTX, USBRX);
 FILE *fp;
+FILE *dp; 
+
 char buffer[1024];
 
-int main() {
+AnalogIn sensor(PTB2); 
+
+InterruptIn event(PTB3);
+AnalogOut led(PTC10);
+
+int interrupt = 0;
+Timer clk; 
+Timer clkb;
+
+/*Configuration_settings*/
+typedef struct {
+        float min_angle;
+        float max_angle;
+        float step_size;
+    } data;
+    data config;
+    
+void ReadConfigurationSettings()
+{   
+    //http://www.inmoov.fr/wp-content/uploads/2015/02/Introduction-to-Servo-Motors-Arduino.pdf
+    //length of pulse corresponds to angle the servo must turn to
+    //1 ms = 0deg, 1.5ms = 90
+    //2 ms = 180deg
+  
+    
     pc.printf("Initializing \n");
-    wait(2);
+     dp = fopen("/sd/config.txt", "r");
+    if(dp == NULL) {
+        pc.printf("Could not open file for write\r\n");
+    }
+    
+     pc.printf("Found the file!");
+     while(!feof (dp)){
+       fscanf(dp, "%f ", &config.min_angle);// in degrees
+       fscanf(dp, "%f ", &config.max_angle);// in degrees
+       fscanf(dp, "%f  ", &config.step_size);//in degrees
+             
+       }
+       pc.printf("%f, %f, %f", config.min_angle, config.max_angle, config.step_size);
+       fclose(dp);
+     
+       
+    
+}
+
 
-    fp = fopen("/sd/hello.txt", "r");
-    if (fp != NULL) {
-        fclose(fp);
-        remove("/sd/hello.txt");
-        pc.printf("Remove an existing file with the same name \n");
+void trigger(){
+    interrupt = abs((interrupt - 1) );
+    led = !led; 
+    //angle = angle+step_size;
+   // return angle; 
+    }
+    
+void BackgroundReading()
+//this function opens the sd folder and saves the background reading for 10seconds
+{
+ float time; 
+ float reading; 
+ FILE *fp = fopen("/sd/mydir/data.csv", "a");   
+ if (fp == NULL){
+     pc.printf("Could not opne file for write \r \n");
+     }
+    //start the time and record background for 10seconds
+    clkb.start();
+    time = clkb.read(); 
+    fprintf(fp, "Background reading\n");
+     
+     while(time < 10)
+     {
+         reading = sensor.read();
+         //save in buffer 
+    }
+    //at the end of the 10 seconds write in file 
+    
+     
+}
+    
+void OpenCsv()
+{
+    mkdir("/sd/mydir", 0777); //make directrory
+    wait(0.2);
+    
+   FILE *fp = fopen("/sd/mydir/data.csv", "w");
+    if(fp == NULL) {
+        pc.printf("Could not open file for write\r\n");
+    }
+    fprintf(fp, "value, time, angle \n");
+    fclose(fp);
+}
+void SaveCsv(FILE *fp, float value, float time, float angle)
+{
+    fp = fopen("/sd/mydir/data.csv", "a");
+    fprintf(fp, "%d, %3f ,%f \n", angle, time, value);
+    fclose(fp);
     }
 
-    printf("\nWriting data to the sd card \n");
-    fp = fopen("/sd/hello.txt", "w");
-    if (fp == NULL) {
-        pc.printf("Unable to write the file \n");
-    } else {
-        fprintf(fp, "mbed SDCard application!");
+int main() {
+    
+        event.rise(&trigger);
+        float value = 0.0;
+        float time_ms = 0.0, time_s =0.0, step_time = 0.0; 
+        int angle =0 ;
+        
+        
+        
+        ReadConfigurationSettings();
+        wait(2);
+        OpenCsv();
+        
+        clk.start(); 
+        time_s = (clk.read_ms())/1000;
+        
+        while (1){ //run for specific time.
+        value = sensor.read();
+         time_ms = clk.read_ms();
+        if (time_ms < 500)
+        {
+            time_s = time_ms/1000;
+            }
+        else {
+        time_s =  ((time_ms + 500)/1000 );  //convert milliseconds to seconds
+        }
+        __disable_irq();
+        if(interrupt == 0){
+        SaveCsv(fp, angle, time_s, value);
+        pc.printf("%f, %3f\n", value, time_s);
+        }
+        
+        __enable_irq();
+        }
+        
         fclose(fp);
-        pc.printf("File successfully written! \n");
-    }
+     
+    
+}
 
-    printf("\nReading data from the SD card. \n");
-    fp = fopen("/sd/hello.txt", "r");
-    if (fp != NULL) {
-        int size = fread(buffer, sizeof(char), 1024, fp);
-        printf("Number of data read: %d, text from hello.txt file: %s \n", size, buffer);
-        fclose(fp);
-    }
-    printf("End of Lab 4. \n");
-}
+