Diff: Settings/Settings.h

Revision:

3:7666de697752

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Settings/Settings.h	Sat Feb 04 20:17:44 2017 +0000
@@ -0,0 +1,148 @@
+#ifndef SETTINGS_H
+#define SETTINGS_H
+
+class Settings
+{
+
+public:
+    Settings();
+    void setBackgroundColor(int);
+    uint16_t getBackgroundColor();
+    void setLCDBrightness(double);
+    float getLCDBrightness();
+
+private:
+    void initialiseSettings();  // intialises the settings
+    
+    bool settingsExist(const char *fname);  // checks whether the setting file exists
+    
+    static MbedJSONValue holder;    // JSON Data structure to store settings read from file
+    static uint16_t backgroundColor;  //
+    static float LCDBrightness; // tracks the LCDBrightness
+    static bool settingsInitialised;    // tracks if settings have already been created
+};
+
+
+Settings::Settings()
+{
+    // initialise the settings first
+
+    // remember to set the varaible to false
+    if (!settingsInitialised) {
+        initialiseSettings();
+        settingsInitialised = true;
+    }
+}
+
+void Settings::initialiseSettings()
+{
+    // pointer to the settings file
+    FILE *ptr_myfile;
+
+    // buffer to store settings data
+    char read_string [256];
+
+    // if the settings file does not exit, create it
+    if (!settingsExist("/local/settings.txt")) {
+
+        // create the settings file
+        FILE *fp;
+        // prepare file for writing
+        fp = fopen("/local/settings.txt", "w");
+
+        // create temporary JSON object
+        MbedJSONValue temp;
+
+        // construct the settings data
+        temp["LCDBrightness"] = 1;
+        temp["LCDColor"] = 1;
+        temp["Data"] = 1;
+
+        // convert json object to string
+        std::string s;
+        s = temp.serialize();
+
+        // write settings to file
+        fprintf(fp, "%s", s.c_str());
+
+        // close the file
+        fclose(fp);
+    }
+
+    // prepare the settings file for reading
+    ptr_myfile = fopen("/local/settings.txt", "r");
+
+    // read the settings string into buffer
+    fgets(read_string,256,ptr_myfile);
+
+    // convert string into JSON Data
+    parse(holder,read_string);
+
+    // initialise all the settings
+
+    // LCD Background Color
+    int color = holder["LCDColor"].get<int>();
+    if (color == 1)
+        backgroundColor = ST7735_BLACK;
+    else
+        backgroundColor = ST7735_WHITE;
+
+    // LCD Brightness
+
+    // close the file
+    fclose(ptr_myfile);
+
+
+}
+
+bool Settings::settingsExist( const char *fname)
+{
+    FILE *file;
+    if (file = fopen(fname, "r")) {
+        fclose(file);
+        return true;
+    }
+    return false;
+}
+
+void Settings::setBackgroundColor( int num )
+{
+    // change the background color apropriately
+    if (num == 1)
+        backgroundColor = ST7735_BLACK;
+    else
+        backgroundColor = ST7735_WHITE;
+
+    // pointer to access file
+    FILE *ptr_myfile;
+
+    // prepare file for writing
+    ptr_myfile = fopen("/local/settings.txt", "w");
+
+    // write the new LCD background value in JSON Object
+    holder["LCDColor"] = num;
+
+    // convert json data to string
+    std::string s;
+    s = holder.serialize();
+
+    // write it to the file
+    fprintf(ptr_myfile, "%s", s.c_str());
+
+    fclose(ptr_myfile);
+
+
+}
+
+uint16_t Settings::getBackgroundColor()
+{
+    // returns the background color
+    if (settingsInitialised){
+        return backgroundColor;
+    }
+    
+    // blue background is a sign of an error
+    return ST7735_BLUE;
+}
+
+#endif
\ No newline at end of file