Diff: main.cpp

Revision:

18:8b3efa4d4a36

Parent:

17:c2e21d347ca5

Child:

19:c0d59019de53

--- a/main.cpp	Sun Dec 02 15:10:57 2018 +0000
+++ b/main.cpp	Mon Dec 03 15:51:51 2018 +0000
@@ -3,6 +3,10 @@
 
 m3pi m3pi;
 
+//File name
+#define FILESYS "robot"
+#define FILENAME "/robot/data.txt"
+
 // Minimum and maximum motor speeds
 #define MAX 0.3
 #define MIN 0
@@ -12,6 +16,50 @@
 #define I_TERM 0
 #define D_TERM 8
 
+
+//typedef -> definer som type i C++
+//uden typedef - det er ikke en type, så du skal skrive struct performance_data
+typedef struct performance_data { //<- navn på structen
+    float wh;
+    int pitstops;
+} performance_data;  //<- navn på typen
+
+
+void write_to_file(performance_data data) {
+
+    //Define file system
+    LocalFileSystem local(FILESYS);
+    
+    //Make a pointer to the file
+    FILE *fp = fopen(FILENAME, "w");  //"w" "r" "a"
+    
+    fprintf(fp, "%0.2f %d", data.wh, data.pitstops);  //write to the file
+    
+    fclose(fp);  //close when done.
+
+}
+
+performance_data read_from_file() {
+
+    performance_data data;
+    
+    
+    //Define file system
+    LocalFileSystem local(FILESYS);
+    
+    //Make a pointer to the file
+    FILE *fp = fopen(FILENAME, "r");  //"w" "r" "a"
+    
+    //Make some error prevention later
+    fscanf(fp, "%f %d", &(data.wh), &(data.pitstops) );  //write to the file
+    
+    fclose(fp);  //close when done.
+    
+    return data;
+   
+}
+
+
 void sensor_all(int arr[]) //lav en funktion? ved ikke hvad jeg skal her
      {
         m3pi.putc(0x87); // send noget sensor data
@@ -48,6 +96,24 @@
 }
 
 int main() {
+    
+    //test the function to write to a local file
+    performance_data robot_stats;
+    robot_stats.wh = 120.5;
+    robot_stats.pitstops = 200;
+    
+    write_to_file(robot_stats);
+    
+    performance_data new_data;
+    new_data = read_from_file();
+    //might get an error here due to timing
+    
+    
+    new_data.wh = new_data.wh * 2;
+    new_data.pitstops = new_data.pitstops * 2;
+    
+    write_to_file(new_data);
+    //should get 247... and 246
 
     m3pi.locate(0,1);
     m3pi.printf("Line PID");