Diff: main.cpp

Revision:

1:2098adebc6da

Parent:

0:a0f7c6807a3a

Child:

2:2a57e2a50796

diff -r a0f7c6807a3a -r 2098adebc6da main.cpp
--- a/main.cpp	Thu Nov 30 20:01:44 2017 +0000
+++ b/main.cpp	Sat Dec 16 11:22:15 2017 +0000
@@ -6,11 +6,24 @@
 
 int x, y, z;
 
-Serial mySerial(SERIAL_TX, SERIAL_RX, 9600);  // tx, rx 
+volatile char input_buffer[90];             // store everything received 
+volatile char message_buffer[90];           // store message
+volatile char input_buffer_counter = 0;   
+volatile char message_counter = 0;  
+volatile char input_flag = false;
+
+volatile char latitude[13] = {' ','1',' ','3',' ',' ',' ',' ',' ',' ',' ',' ',' '};
+volatile char longtitude[13] = {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};;
+volatile char coorFlag = 0;
+
+
+Serial mySerial(SERIAL_TX, SERIAL_RX, 9600);  // tx, rx
+Serial gpsSerial(A0, A1, 9600);  // tx, rx  
 
 I2C i2cAcc(I2C_SDA, I2C_SCL);
 
 void ADXL_ISR();
+void rxHandler();
 
 int main() {
     
@@ -58,6 +71,8 @@
     
     mySerial.printf("SparkFun ADXL345 Accelerometer Hook Up Guide Example\n");
     
+    gpsSerial.attach(rxHandler);
+    
 
     
     while(1) {
@@ -71,10 +86,34 @@
         //mySerial.printf("X: %i\nY: %i\nZ: %i\n================\n", x, y, z);
         //wait(2);
       
-        ADXL_ISR();
+        //ADXL_ISR();
         // You may also choose to avoid using interrupts and simply run the functions within ADXL_ISR(); 
         //  and place it within the loop instead.  
         // This may come in handy when it doesn't matter when the action occurs. 
+        /*
+        if(input_flag)          // if message received
+        {
+          // check type of message and either send it directly, or convert to another type and send
+          //
+          // GGA input, send directly =============================================================
+          if(input_buffer[1] == 'G')      
+          {
+            for(char i=0; i<message_counter; i++)   // copy message stored to output_buffer;
+              message_buffer[i] = input_buffer[i];
+            
+            message_counter = input_buffer_counter;                    // set output pointer/counter value to input message counter value
+          }
+        }
+        */
+        
+        if(coorFlag)                // show coordinates
+        {           
+            mySerial.printf("latitude: %s\n", latitude);
+            mySerial.printf("longtitude: %s\n", longtitude);
+            
+            coorFlag = 0;
+        }
+        
         
     }
 }
@@ -119,3 +158,83 @@
   } 
 }
 
+
+// RX interrupt handler
+// stores everything into input_buffer
+void rxHandler()
+{
+  char tmp;
+  
+  do
+  {
+    tmp = gpsSerial.getc();       // read serial data
+  
+    if(tmp == '$')                    // if message start character( every nmea message starts with $)
+    {
+      input_buffer_counter = 0;       // reset inut buffer counter
+      return;
+    }
+  
+    if(tmp == '*')                    // if end of message( every nmea message ends with *+CRC)
+    {
+      if(input_buffer[3] == 'L')      // if nmea string type is GPGLL
+      {
+          int t = 0; 
+          int lat = 0;
+          int lon = 0;
+          
+          for(int i=0; i<13; i++)           // clear latitude and longtitude
+          {
+              latitude[lat++] = ' '; 
+              longtitude[lon++] = ' ';
+          }
+          
+          while(input_buffer[t] != ',')      // find coma after GPGLL
+            t++;                            // t points coma after GPGLL
+            
+          t++;              // set to to first latitude character
+          
+          
+          lat = 0;
+          
+          while(input_buffer[t] != ',')      // copy latitude value
+          {
+            latitude[lat] = input_buffer[t];
+            lat++;
+            t++;                            // t points coma after latitude 
+          }    
+          latitude[lat] = input_buffer[t];          // copy coma
+          t++; 
+          latitude[lat] = input_buffer[t];          // copy N or S direction
+          t++; 
+
+          t++;              // set t to first character of longtitude
+          
+          
+          lon = 0;
+          
+          while(input_buffer[t] != ',')      // copy longtitude value
+          {
+            longtitude[lon] = input_buffer[t];
+            lon++;
+            t++;                            // t points coma after longtitude 
+          }    
+          longtitude[lon] = input_buffer[t];          // copy coma
+          t++; 
+          longtitude[lon] = input_buffer[t];          // copy W or E direction
+          
+          coorFlag = 1;
+          
+          gpsSerial.printf("message: %s", input_buffer);
+          
+      }
+      return;
+    }
+    
+    input_buffer[input_buffer_counter] = tmp;
+    input_buffer_counter++;
+  }
+  while(gpsSerial.readable());
+}
+
+