first commit

BasicGPS/BasicGPS.ino

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+// Basic GPS with RPI Pico USART1.
+
+// Using Arduino Compatible GPS Receiver Module Jaycar (Australia) CAT.NO:  XC3710
+// https://www.jaycar.com.au/arduino-compatible-gps-receiver-module/p/XC3710
+// nblox NEO-7M Module  BAUD is 9600
+
+// // Nb: GPn pin numbers not package pin numbers
+#define TXD2 4  // Not used
+#define RXD2 5  // Connect to GPS Unit TX
+
+// Pins Ceramic Antenna side:
+// ==========================
+// PPS nc
+// RXD nc
+// TXD --> RXD2
+// GND --> GND
+// Vcc --> 3.3V
+
+// Note: USART1 is Serial2
+// RPI Pico has has 2 USART, USART0 is Serial/Serial1/USB
+
+void setup() {
+  Serial2.setRX(RXD2);  
+  Serial2.setTX(TXD2);
+  Serial2.begin(9600);
+  Serial.begin(9600);
+  delay(1000);
+}
+
+void loop() {
+  if (Serial2.available()) 
+  {
+    while(Serial2.available()) 
+    {
+      char c1 = Serial2.read(); 
+      Serial.write(c1);
+      /*while(!Serial2.available())
+      {}
+      while(Serial2.available())
+      {
+        Serial.write(toupper(Serial2.read()));
+      }*/
+    }
+    //Serial.write("\n");
+  }
+}

InteractiveGPS/InteractiveGPS.ino

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+// Interactive GPS with RPI Pico USART1.
+
+// Using Arduino Compatible GPS Receiver Module Jaycar (Australia) CAT.NO:  XC3710
+// https://www.jaycar.com.au/arduino-compatible-gps-receiver-module/p/XC3710
+// nblox NEO-7M Module  BAUD is 9600
+// NMEA Ref: https://www.opencpn.org/wiki/dokuwiki/doku.php?id=opencpn:opencpn_user_manual:advanced_features:nmea_sentences
+
+// // Nb: GPn pin numbers not package pin numbers
+#define TXD2 4  // Not used
+#define RXD2 5  // Connect to GPS Unit TX
+
+// Pins Ceramic Antenna side:
+// ==========================
+// PPS nc
+// RXD nc
+// TXD --> RXD2
+// GND --> GND
+// Vcc --> 3.3V
+
+// Note: USART1 is Serial2
+// RPI Pico has has 2 USART, USART0 is Serial/Serial1/USB
+
+bool run = true;
+bool done=false;
+char mode ='a';
+char nmea[128];
+int indx=0;
+bool starting = true;
+
+void setup() {
+  run = true;
+  mode ='d';
+  indx=0;
+  done=false;
+  starting=true;
+  nmea[0]=0;
+  Serial2.setRX(RXD2);  
+  Serial2.setTX(TXD2);
+  Serial2.begin(9600);
+  Serial.begin(9600);
+  delay(1000);
+}
+
+
+
+void loop() {
+
+  if (Serial.available()) 
+  {
+    char cmd = Serial.read();
+
+    cmd = tolower(cmd);
+    switch (cmd)
+    {
+      case 's':
+        run= true;
+        indx=0;
+        done=false;
+        starting = true;
+        Serial.println("Start");
+        nmea[0]=0;
+        break;
+      case 'p':
+        run= false;
+        Serial.println("Stop");
+        break;
+      case '\n':
+        break;
+      case '\r':
+        break;
+      default:
+        mode=cmd;
+        Serial.print("Mode: ");
+        switch (mode)
+        {
+          case 'd':
+            Serial.println("Display all");
+            break;
+          case 'n':
+            Serial.println("Display none");
+            break;
+          case 'l':
+            Serial.println("Display GLL - Geographic Position, Latitude / Longitude");
+            break;
+          case 'a':
+            Serial.println("Display GGA - Global Positioning System Fix Data");
+            break;
+          case 'v':
+            Serial.println("Display GSV - Satellites in view");
+            break;          
+          default:
+            Serial.println("Not a command!");
+            break;
+        }
+        break;
+    }
+  }
+
+  if(run)
+  {
+    if (Serial2.available()) 
+    {
+      while((Serial2.available()) &&(!done))
+      {
+        char c1 = Serial2.read();
+        if(starting)
+        {
+          if(c1=='$')
+          {
+            starting=false;
+            indx=0;
+            done=false;
+            nmea[indx]=c1;
+            indx++;
+            continue;
+          }
+          else
+          {
+            continue;
+          }
+        }
+        else if (c1=='\n')
+        {
+          done = true;
+          break;
+        }
+        else if (c1=='\r')
+        {
+          done = true;
+          break;
+        }
+        else
+        {
+          nmea[indx]=c1;
+          indx++;
+          if(indx>128)
+          {
+            Serial.println("Overrun.");
+            indx=0;
+            done=false;
+            nmea[0]=0;
+            break;
+          }
+          nmea[indx]=0;
+        }
+      } 
+      if (done)
+      {
+        // Expect starting with GP
+        if(nmea[1]=='G')
+          {
+            if(nmea[2]=='P')
+            {
+            switch (mode)
+            {
+              case 'd':
+                Serial.println(nmea);
+                break;
+              case 'n':
+                break;
+              case 'l': // $GPGLL
+                if(nmea[5]=='L')
+                {
+                  if(nmea[4]=='L')
+                  {
+                    if(nmea[3]=='G')
+                    {
+                      Serial.println(nmea);
+                    }
+                  }
+                }
+                break;
+              case 'a': // $GPGGA
+                if(nmea[5]=='A')
+                {
+                  if(nmea[4]=='G')
+                  {
+                    if(nmea[3]=='G')
+                    {
+                      Serial.println(nmea);
+                    }
+                  }
+                }
+                break;
+              case 'v': // $GPGSV
+                if(nmea[5]=='V')
+                {
+                  if(nmea[4]=='S')
+                  {
+                    if(nmea[3]=='G')
+                    {
+                      Serial.println(nmea);
+                    }
+                  }
+                }
+                break;
+              default:
+                break;
+            }
+            starting=true;
+            done=false;
+          }
+        }
+      }
+    }
+  }
+}