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libraries/TinySuite/examples/nmea-time/main.cpp

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+#include <string.h>
+#include <stdint.h>
+#include <avr/interrupt.h>
+#include <TinySleep.h>
+#include <TinyTimer1Compare.h>
+#include <TinyPinChangeB.h>
+#include <TinyUartReader.h>
+#include <TinyNmea.h>
+
+struct NmeaData {
+  bool fresh; // custom data readiness indicator
+  char time[18]; // "hh:mm:ss DD/MM/YY"
+};
+
+// result data holder
+NmeaData data;
+
+// parser configuration array
+NmeaParser config[] = {
+  // this function will be called for every term in ZDA statement
+  {{'Z','D','A'}, [](const char* term, const uint8_t index) {
+    // i.e. $GPZDA,201530.00,04,07,2002,00,00*60
+    switch (index) {
+      case 0: // time (term = "201530.00")
+        for (uint8_t i = 0, j = 0; i < 6; i+=2, j+=3) {
+          memcpy(&data.time[j], &term[i], 2);
+        }
+        data.time[2] = ':';
+        data.time[5] = ':';
+        data.time[8] = ' ';
+        break;
+      case 1: // day (term = "04")
+        memcpy(&data.time[9], &term[0], 2);
+        data.time[11] = '/';
+        break;
+      case 2: // month (term = "07")
+        memcpy(&data.time[12], &term[0], 2);
+        data.time[14] = '/';
+        break;
+      case 3: // year (term = "2002")
+        memcpy(&data.time[15], &term[2], 2);
+        data.time[17] = 0;
+        data.fresh = true;
+        break;
+    }
+  }}
+};
+
+TinyNmea nmea(config, sizeof(config));
+
+int main() {
+  sei();
+  // continuously read from PB2 (pin 7) at 9600 baud using Timer1 in compare mode
+  uartReader.on(PB2, 9600, Timer1Compare, PinChangeB);
+  while (1) {
+    while (uartReader.inputAvailable()) {
+      // send each symbol to NMEA parser
+      nmea.next(uartReader.read());
+    }
+    if (data.fresh) {
+      data.fresh = false;
+      // make use of data.time value
+    }
+    idleSleep();
+  }
+  return 0;
+}