Adding an alternative hardware design-

DesignMicroAPRSNavspark/MicroAprsNavspark/MicroAprsNavspark.ino

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+/*
+Copyright 2014 Institute IRNAS Race - S56MC - Musti, musti@irnas.eu
+
+MicroAprsNavspark is to be used with NavSpark Arduino environment, for more information visit http://navspark.com.tw
+
+The MicroAprsNavspark is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by the
+Free Software Foundation, either version 3 of the License, or (at your
+option) any later version.
+
+The MicroAprsNavspark is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with the MicroAprsNavspark. If not, see http://www.gnu.org/licenses/.
+*/
+#include "sti_gnss_lib.h"
+#include "GNSS.h"
+
+#define POSITIONRATE 60 // periodically send the location - in seconds
+uint16_t delayer = 0;
+uint8_t gpio_bit = 0;
+
+// Generally, you shuould use "unsigned long" for variables that hold time
+// The value will quickly become too large for an int to store
+unsigned long previousMillis = 0;        // will store last time LED was updated
+float lla_deg=0;
+float lla_min=0;
+float llo_deg=0;
+float llo_min=0;
+float lla=0;
+float llo=0;
+
+void setup() {
+  // put your setup code here, to run once:
+  GnssConf.setNavMode(STGNSS_NAV_MODE_AUTO);
+  GnssConf.setUpdateRate(STGNSS_POSITION_UPDATE_RATE_1HZ);
+  GnssConf.setDopMaskMode(STGNSS_DOP_MASK_AUTO);
+  GnssConf.setPdopMask(30.0);
+  GnssConf.setHdopMask(30.0);
+  GnssConf.setGdopMask(30.0);
+  GnssConf.init(); /* do initialization for GNSS */
+  gnss_gpio_set_output(gpio_bit);
+  
+  //set up the serail port to talk to MicroAPRS
+  Serial.config(STGNSS_UART_8BITS_WORD_LENGTH, STGNSS_UART_1STOP_BITS, STGNSS_UART_NOPARITY);
+  Serial.begin(9600);
+  //configure the reset pin and reset MicroAPRS
+  pinMode(14,OUTPUT);
+  digitalWrite(14,LOW);
+  delay(100);
+  digitalWrite(14,HIGH);
+  delay(100);
+  // send settings
+  configureMicroAPRS();
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}
+
+void configureMicroAPRS(){
+  Serial.println("c<CALL>"); //callsign
+  Serial.println("sc7"); //SSID
+  Serial.println("S"); //save
+}
+
+/*
+  NOTE: "task_called_after_GNSS_update()" will be called about every second
+        (for 1Hz update rate), so we display the info. here.
+*/
+void task_called_after_GNSS_update(void)
+{
+  static uint8_t val = 0;
+  char buf[64];
+  
+  //blinking the blue LED
+  if (val == 1) gnss_gpio_high(gpio_bit);
+  else gnss_gpio_low(gpio_bit);
+  val = 1 - val; 
+  
+  //triggering the position update on the defined interval
+  delayer++;
+  if(delayer>POSITIONRATE){
+    aprs_send();
+    delayer=0;
+  }
+  //send the counter state to PC serial port
+  int len = sprintf(buf, "Counter: %d\r\n",delayer);
+  gnss_uart_putline(0,(U08*)buf,len);
+}
+
+void aprs_send(){
+  char buf[64];
+  char lla_sign;
+  char llo_sign;
+  // first get the updated location
+  GnssInfo.update();
+  
+  //check if the location has been updated - valid fix
+  if (GnssInfo.isUpdated() == true) {
+      //get location information
+      lla=GnssInfo.location.latitude();
+      llo=GnssInfo.location.longitude();
+      
+      //determine hemisphere
+      if(lla>=0){
+        lla_sign=0x4e; //capital N
+      }
+      else{
+        lla_sign=0x53; //capital S
+        lla*=-1;//make the number positive
+      }
+      if(llo>=0){
+        llo_sign=0x45; //capital E
+      }
+      else{
+        llo_sign=0x57; //capital W
+        llo*=-1;//make the number positive
+      }
+      
+      //convert it to deg, min format
+      lla_deg=(int)lla;
+      lla_min=(lla-lla_deg)*60;
+      llo_deg=(int)llo;
+      llo_min=(llo-llo_deg)*60;
+      
+      //print to serial port
+      uint8_t len=sprintf(buf, "!=%02.0f%.2f%c/%03.0f%.2f%c-PHG2/3060/MicroAPRS+Navspark\r\n",lla_deg,lla_min,lla_sign,llo_deg,llo_min,llo_sign);
+      Serial.print(buf);
+      gnss_uart_putline(0,(U08*)buf,len);
+    }
+}
+