Revision 1:f7206e74c970, committed 2017-11-17

Comitter:

stoilivanov

Date:

Fri Nov 17 14:17:20 2017 +0000

Parent:

0:95bf84c286f5

Commit message:

Submission from a team (Ivan Mihov, Stoil Ivanov, Zdravko Dimitrov) in HEPTA-Sat training, Bulgaria.

Changed in this revision

diff -r 95bf84c286f5 -r f7206e74c970 3daf572bcae1/main.cpp
--- a/3daf572bcae1/main.cpp	Sat Nov 11 14:34:04 2017 +0000
+++ b/3daf572bcae1/main.cpp	Fri Nov 17 14:17:20 2017 +0000
@@ -1,3 +1,16 @@
+/*This is the RECEIVER code of Laser Communication Protocol v1.0 developed by
+Ivan Mihov, Stoil Ivanov and Zdravko Dimitrov. The protocol was developed during
+the HEPTA-Sat training held in the Faculty of Physics at Sofia University
+"St. Kliment Ohridski", Bulgaria. The training was conducted from 24th to
+28th of October 2017 with instructors Dr. Masahiko Yamazaki, Mr. Takafumi
+Umezawa and Mr. Riku Sato.
+
+For contacting the developers, please use e-mails:
+ipmihov@gmail.com - Ivan Mihov
+stoil.n.ivanov@gmail.com - Stoil Ivanov
+z.dimitrov91@gmail.com - Zdravko Dimitrov
+We will be glad to help!*/
+
 #include "mbed.h"
 #include "SDFileSystem.h"
 #include "HeptaXbee.h"
@@ -21,439 +34,314 @@
 HeptaBattery battery(p16,p26);
 DigitalOut myled(LED1);
 
+
+//Definition of MORSE and ASCII structure variables
 typedef struct {
-
-char* morse;
-
-char* ascii;
-
+    char* morse;
+    char* ascii;
 } morse_table_t;
 
-
 int main()
-
 {
 
-morse_table_t table[] = { {".-", "A"},
-
-{"-...", "B"},
-
-{"-.-.", "C"},
-
-{"-.." , "D"},
-
-{"." , "E"},
-
-{"..-." , "F"},
-
-{"--." , "G"},
-
-{"...." , "H"},
-
-{".." , "I"},
-
-{".---" , "J"},
-
-{"-.-" , "K"},
-
-{".-.." , "L"},
-
-{"--" , "M"},
-
-{"-." , "N"},
-
-{"---" , "O"},
-
-{".--." , "P"},
-
-{"--.-" , "Q"},
-
-{".-." , "R"},
-
-{"..." , "S"},
-
-{"-" , "T"},
-
-{"..-" , "U"},
-
-{"...-" , "V"},
-
-{".--" , "W"},
-
-{"-..-" , "X"},
-
-{"-.--" , "Y"},
-
-{"--.." "Z"},
-
-{"-----" ,"0"},
-
-{".----" ,"1"},
-
-{"..---" , "2"},
-
-{"...--" , "3"},
-
-{"....-" , "4"},
-
-{"....." , "5"},
+//Morse code dictionary
+    morse_table_t table[] = { {".-", "A"},
+        {"-...", "B"},
+        {"-.-.", "C"},
+        {"-.." , "D"},
+        {"." , "E"},
+        {"..-." , "F"},
+        {"--." , "G"},
+        {"...." , "H"},
+        {".." , "I"},
+        {".---" , "J"},
+        {"-.-" , "K"},
+        {".-.." , "L"},
+        {"--" , "M"},
+        {"-." , "N"},
+        {"---" , "O"},
+        {".--." , "P"},
+        {"--.-" , "Q"},
+        {".-." , "R"},
+        {"..." , "S"},
+        {"-" , "T"},
+        {"..-" , "U"},
+        {"...-" , "V"},
+        {".--" , "W"},
+        {"-..-" , "X"},
+        {"-.--" , "Y"},
+        {"--.." "Z"},
+        {"-----" ,"0"},
+        {".----" ,"1"},
+        {"..---" , "2"},
+        {"...--" , "3"},
+        {"....-" , "4"},
+        {"....." , "5"},
+        {"-...." ,"6"},
+        {"--..." , "7"},
+        {"---.." , "8"},
+        {"----." , "9"},
+        {"/" , " "}
+    };
+    pc.baud(9600);
 
-{"-...." ,"6"},
-
-{"--..." , "7"},
-
-{"---.." , "8"},
-
-{"----." , "9"},
-
-{"/" , " "}
-
-};
-
-pc.baud(9600);
-
-int st=0;
+    char symbol,space;
+    char mes[100];
+    float count=0.0,count_on=0.0,count_off=0.0 ;
+    float current,vol,sig,lux;
+    
+    led = 1;
 
-char symbol,space;
-
-char mes[100];
-
-char sysp[2];
-
-float count=0.0,count_on=0.0,count_off=0.0, len = 0.0;
-
-float current,vol,sig,lux;
-
-led = 1;
-
-mkdir("/sd/LaserComms", 0777);
-
-FILE *fp = fopen("/sd/LaserComms/message.txt", "w");
+//Creating directory for storing the laser message on the SD card
+    mkdir("/sd/LaserComms", 0777);
+    
+//Creating and opening a file 'for writing' the morse message
+    FILE *fp = fopen("/sd/LaserComms/message.txt", "w");
+    if(fp == NULL) {
+        error("Could not open file for writing\r\n");
+    }
 
-if(fp == NULL) {
-
-error("Could not open file for writing\r\n");
-
-}
-
-while (1) {
-
-do {
-
-vol = light.read();
-
-sig = 3.3*1.947*vol;
-
-current = sig * 100;
+//Sequence for 'start bit'
+    while (1) {
+        do {
+            vol = light.read();
+            sig = 3.3*1.947*vol;
+            current = sig * 100;
+            lux = (current)*2;
+            
+            if (lux > 300) {
+                count = count + 0.1;
+            } else {
+                count = 0.0;
+            }
 
-lux = (current)*2;
-
-if ( lux > 300 ) {
-
-count = count + 0.1;
-
-} else {
+            xbee.printf("lux= %f , current= %f ,vol= %f , count= %f \r\n",lux,current,vol,count);
+            wait (0.1);
+        } while (count <= 3.0); //Condition for 'start bit'
 
-count = 0.0;
-
-}
-
-xbee.printf("lux= %f , current= %f ,vol= %f , count= %f \r\n",lux,current,vol,count);
-
-wait (0.1);
-
-} while ( count <= 3.0 );
-
+//'Start bit' received
 xbee.printf("LASER COMMUNICATION ESTABLISHED! RECEIVING MODE ON!\r\n");
 
-
-
-lux=0;
-
-while(1) {
-
-count_on = 0.0;
-
-count_off = 0.0;
-
-/*vol = light.read();
-
-sig = 3.3*1.947*vol;
-
-current = sig * 100;
-
-lux = (current)*2;*/
-
-
-
-while(lux<300) {
-
-xbee.printf("lux= %f, count_off= %f \r\n",lux,count_off);
-
-count_off = count_off + 0.05;
-
-wait(0.05);
-
-vol = light.read();
-
-sig = 3.3*1.947*vol;
+//Laser signal reading starts
+        lux=0;
+        while(1) {
+            count_on = 0.0;
+            count_off = 0.0;
 
-current = sig * 100;
-
-lux = (current)*2;
-
-}
-
-if (count_off >= 0.5) {
-
-space = '/';
-
-} else {
-
-space = '\0';
-
-}
+//----------- While loop for 'spaces' in the message
+            while(lux < 300) {
+                xbee.printf("lux= %f, count_off= %f \r\n",lux,count_off);
+                count_off = count_off + 0.05;
+                wait(0.05);
+                vol = light.read();
+                sig = 3.3*1.947*vol;
+                current = sig * 100;
+                lux = (current)*2;
+            }
+ 
+ //Condition for defining the type of the 'space signal'
+ //Currently developed for single words only
+            if (count_off >= 0.5) {
+                space = 'x';
+                fprintf(fp,"%c",space);
+            }
 
-if (count_off > 3.0) {
-
-break;
-
-}
-
-
-
-while(lux>=300) {
-
-xbee.printf("lux= %f, count_on= %f \r\n",lux,count_on);
-
-count_on = count_on + 0.05;
-
-wait(0.05);
+//Check for 'stop bit'
+            if (count_off > 3.0) {
+                break;
+            }
 
-vol = light.read();
-
-sig = 3.3*1.947*vol;
-
-current = sig * 100;
-
-lux = (current)*2;
-
-}
-
-if (count_on >= 0.5) {
-
-symbol = '-';
-
-} else {
-
-symbol = '.';
-
-}
-
-if (count_off > 3.0) {
-
-break;
-
-}
-
-pc.printf("%c%c", space,symbol);
-
-fprintf(fp,"%c",symbol);
-
-
+//----------- While loop for 'symbols' in the message
+            while(lux >= 300) {
+                xbee.printf("lux= %f, count_on= %f \r\n",lux,count_on);
+                count_on = count_on + 0.05;
+                wait(0.05);
+                vol = light.read();
+                sig = 3.3*1.947*vol;
+                current = sig * 100;
+                lux = (current)*2;
+            }
+            
+//Condition for defining the type of the 'symbol signal'
+            if (count_on >= 0.5) {
+                symbol = '-';
+                fprintf(fp,"%c",symbol);
+            } else {
+                symbol = '.';
+                fprintf(fp,"%c",symbol);
+            }
 
-}
-
-fclose(fp);
-
-fp = fopen("/sd/LaserComms/message.txt","r");
-
-fgets(mes,100,fp);
+//Check for 'stop bit'
+            if (count_off > 3.0) {
+                break;
+            }
+        }
 
-pc.printf("%s\n",mes);
-
-fclose(fp);
+//At this point the 'stop bit' has been received    
+    fclose(fp);
 
-
-
-if (mes != "\0") {
+//The message was written in a file on the SD card
 
-xbee.printf("Message accepted successfully! \r\n");
-
-xbee.printf("Morse: %s\r\n Translating... \r\n",mes);
-
-}
-
-
+//Now we open the same file to read the message and store it in a string 
+    fp = fopen("/sd/LaserComms/message.txt","r");
+    fgets(mes,100,fp);
+    fclose(fp);
 
-char* segment,final_mes;
-
-int i;
+//Check if the message is not empty
+        if (mes != "\0") {
+            xbee.printf("Message accepted successfully! \r\n");
+            xbee.printf("Morse: %s\r\n Translating... \r\n",mes);
+        }
 
-segment = strtok(mes, " ");
-
-xbee.printf("Translated: ");
-
-FILE *fh = fopen("/sd/LaserComms/final_message.txt", "w");
+//Definitiom of characters and strings for the Morse Code Translator
+        char* segment;
+        char final_mes[100];
+        int i;
 
-if(fh == NULL) {
-
-error("Could not open file for writing\r\n");
-
-}
-
-while(segment) {
-
-for(i=0; i<37; ++i) {
-
-if (!strcmp(segment, table[i].morse)) {
-
-xbee.printf("%s",(table[i].ascii));
-
-fprintf(fh,"%s",(table[i].ascii));
-
-}
-
-}
-
-segment = strtok(NULL, " ");
-
-}
-
-
-
-fclose(fh);
-
-fh = fopen("/sd/LaserComms/final_message.txt","r");
-
-fgets(&final_mes,100,fh);
+//Here we divide the message in 'segments' using the symbol for space 'x'
+        segment = strtok(mes, "x");
+        
+        xbee.printf("Translated: ");
+        
+//We create a file to store the final translated message
+        FILE *fh = fopen("/sd/LaserComms/final_message.txt", "w");
+        if(fh == NULL) {
+            error("Could not open file for writing\r\n");
+        }
 
-fclose(fh);
-
-
-
-
-
-if ( "final_mes" == "TELEMETRY" ) {
-
-xbee.printf("Telemetry requested!");
-
-cam_gps.gps_setting();
-
-float gx,gy,gz,ax,ay,az,mx,my,mz,bt,temper;
-
-char ns='A',ew='B',aunit='m';
+//The Morse-to- text translation sequence starts
+        while(segment) {
+            for(i=0; i<37; ++i) {
+//Here we compare the message segment with the defined Morse code dictionary
+                if (!strcmp(segment, table[i].morse)) {
+//The translated message is sent to the Ground Station
+                    xbee.printf("%s",(table[i].ascii));
+//The translated message is stored in a file on the SD card                    
+                    fprintf(fh,"%s",(table[i].ascii));
+                    break;
+                }
+            }
+            segment = strtok(NULL, "x");
+        }
+        fclose(fh);
 
-float time=0.0,latitude=0.0,longitude=0.0,hacu=0.0,altitude=0.0;
-
-int quality=0,stnum=0,gps_check=0;
-
-for(int i = 0; i < 10; i++) {
-
-n_axis.sen_gyro(&gx,&gy,&gz);
+//We open the file, which contains the translated message
+        fh = fopen("/sd/LaserComms/final_message.txt","r");
+//The file is read and the translated message is stored in a string
+        fgets(final_mes,100,fh);
+        fclose(fh);
 
-n_axis.sen_acc(&ax,&ay,&az);
-
-n_axis.sen_mag(&mx,&my,&mz);
-
-battery.vol(&bt);
-
-temp.temp_sense(&temper);
-
-cam_gps.gga_sensing(&time, &latitude, &ns, &longitude, &ew, &quality, &stnum, &hacu, &altitude, &aunit, &gps_check);
+//From here on we define few commands, depending on the message content
 
-
-
-xbee.printf("gx = %f gy = %f gz = %f\r\n",gx,gy,gz);
-
-xbee.printf("ax = %f ay = %f az = %f\r\n",ax,ay,az);
-
-xbee.printf("mx = %f my = %f mz = %f\r\n",mx,my,mz);
-
-xbee.printf("Temperature = %f\r\n",temper);
-
-xbee.printf("Battery voltage: = %f[V]\r\n",bt);
-
-xbee.printf("%f,%f,%c,%f,%c,%d,%d,%f,%f,%c\r\n\n",time,latitude,ns,longitude,ew,quality,stnum,hacu,altitude,aunit);
-
-led = (i%2);
-
-wait(1.0);
-
-}
-
-xbee.initialize();
-
-}
-
-if ( "final_mes" == "PHOTO") {
-
-led = 0;
-
-wait(0.2);
-
-led = 1;
+//------- TELEMETRY COMMAND
+        if (!strcmp(final_mes, "TELEMETRY")) {
+            xbee.printf("Telemetry requested!");
+            cam_gps.gps_setting();
+            float gx,gy,gz,ax,ay,az,mx,my,mz,bt,temper;
+            char ns='A',ew='B',aunit='m';
+            float time=0.0,latitude=0.0,longitude=0.0,hacu=0.0,altitude=0.0;
+            int quality=0,stnum=0,gps_check=0;
+            for(int i = 0; i < 10; i++) {
+                n_axis.sen_gyro(&gx,&gy,&gz);
+                n_axis.sen_acc(&ax,&ay,&az);
+                n_axis.sen_mag(&mx,&my,&mz);
+                battery.vol(&bt);
+                temp.temp_sense(&temper);
+                cam_gps.gga_sensing(&time, &latitude, &ns, &longitude, &ew, &quality, &stnum, &hacu, &altitude, &aunit, &gps_check);
+                xbee.printf("gx = %f gy = %f gz = %f\r\n",gx,gy,gz);
+                xbee.printf("ax = %f ay = %f az = %f\r\n",ax,ay,az);
+                xbee.printf("mx = %f my = %f mz = %f\r\n",mx,my,mz);
+                xbee.printf("Temperature = %f\r\n",temper);
+                xbee.printf("Battery voltage: = %f[V]\r\n",bt);
+                xbee.printf("%f,%f,%c,%f,%c,%d,%d,%f,%f,%c\r\n\n",time,latitude,ns,longitude,ew,quality,stnum,hacu,altitude,aunit);
+                led = (i%2);
+                wait(1.0);
+            }
+            xbee.initialize();
+        }
 
-wait(0.2);
-
-led = 0;
-
-wait(0.2);
-
-led = 1;
-
-wait(0.2);
-
-led = 0;
-
-wait(0.2);
-
-led = 1;
+//------- PHOTO COMMAND
+        if (!strcmp(final_mes, "PHOTO")) {
+//---------LED blinks several times
+            for(int i = 0; i < 7; i++) {
+            led = (i%2); 
+            wait(0.2);
+            }
 
-wait(0.2);
-
-led = 0;
-
-xbee.printf("Photo requested! \r\n Camera Snapshot Mode\r\n\n Please Smile! :) \r\n");
-
-cam_gps.Sync();
+            xbee.printf("Photo requested! \r\n Camera Snapshot Mode\r\n\n Please, smile! :) \r\n");
+            cam_gps.Sync();
+            cam_gps.initialize(HeptaCamera_GPS::Baud115200, HeptaCamera_GPS::JpegResolution640x480);
+            cam_gps.test_jpeg_snapshot_picture(1);
+            led = 1;
+        }
 
-cam_gps.initialize(HeptaCamera_GPS::Baud115200, HeptaCamera_GPS::JpegResolution640x480);
-
-cam_gps.test_jpeg_snapshot_picture(1);
-
-led = 1;
-
-}
-
-if ( "final_mes" == "SOS") {
+//------- SOS COMMAND
+        if (!strcmp(final_mes, "SOS")) {
 
 // LED blinks SOS message
+xbee.printf("LEDs blinks SOS message! \r\n");
 
-}
-
-xbee.putc(xbee.getc());
+        led=0;
+        wait(0.2);
 
-led=0;
-
-wait(0.2);
-
-led = 1;
-
-wait(0.2);
+// 'S' letter: . . .      
+        led = 1;
+        wait(0.2);
+        
+        led = 0;
+        wait(0.2);
+        
+        led = 1;
+        wait(0.2);
+        
+        led = 0;
+        wait(0.2);
+        
+        led = 1;
+        wait(0.2);
+        
+//Space between letters
+        led = 0;
+        wait(0.7);
 
-led = 0;
-
-wait(0.2);
-
-led = 1;
-
-wait(0.2);
+// 'O' letter: - - -
+        led = 1;
+        wait(0.7);
+        
+        led = 0;
+        wait(0.2);
+        
+        led = 1;
+        wait(0.7);
+        
+        led = 0;
+        wait(0.2);
 
-led = 0;
-
-xbee.printf("Communication terminated! \r\n");
-
-}
-
+        led = 1;
+        wait(0.7);
+        
+//Space between letters
+        led = 0;
+        wait(0.7);
+        
+// 'S' letter: . . .      
+        led = 1;
+        wait(0.2);
+        
+        led = 0;
+        wait(0.2);
+        
+        led = 1;
+        wait(0.2);
+        
+        led = 0;
+        wait(0.2);
+        
+        led = 1;
+        wait(0.2);
+        
+        led = 0;
+        xbee.printf("SOS message sent back the Earth with the LED! \r\n");
+        }
+    }
 }
\ No newline at end of file