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libraries/Adafruit_GPS_Library/examples/GPS_SPI_EchoTest/GPS_SPI_EchoTest.ino

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+// Test code for Adafruit GPS That Support Using SPI
+//
+// This code shows how to test a passthru between USB and SPI
+//
+// Pick one up today at the Adafruit electronics shop
+// and help support open source hardware & software! -ada
+
+#include <Adafruit_GPS.h>
+
+// Connect to the GPS on the hardware SPI port
+// with CS on pin #10
+Adafruit_GPS GPS(&SPI, 10);
+#define RESET_PIN 9
+
+void setup() {
+  // wait for hardware serial to appear
+  while (!Serial);
+
+  // make this baud rate fast enough to we aren't waiting on it
+  Serial.begin(115200);
+
+  Serial.println("Adafruit GPS library basic SPI test!");
+  pinMode(RESET_PIN, OUTPUT);
+  digitalWrite(RESET_PIN, LOW);
+  delay(10);
+  digitalWrite(RESET_PIN, HIGH);
+  delay(100);
+  GPS.begin(100000);  // use 100kHz for SPI data rate
+  GPS.println(PMTK_SET_NMEA_UPDATE_10HZ);
+  GPS.println(PMTK_SET_NMEA_OUTPUT_ALLDATA); 
+}
+
+
+void loop() {
+  if (Serial.available()) {
+    char c = Serial.read();
+    GPS.write(c);
+  }
+  if (GPS.available()) {
+    char c = GPS.read();
+    Serial.write(c);
+  }
+}