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examples/rf22/rf22_cw/rf22_cw.ino

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+// rf22_cw.ino
+// -*- mode: C++ -*-
+// Example sketch showing how to emit a continuous carrier wave (CW)
+// for test purposes
+// Tested on Duemilanove, Uno with Sparkfun RFM22 wireless shieldg
+
+#include <SPI.h>
+#include <RH_RF22.h>
+
+// Singleton instance of the radio driver
+RH_RF22 rf22;
+
+void setup() 
+{
+  Serial.begin(9600);
+  if (!rf22.init())
+    Serial.println("init failed");
+  // Defaults after init are 434.0MHz, 0.05MHz AFC pull-in, modulation FSK_Rb2_4Fd36
+
+  // CW mode:
+  rf22.setModemConfig(RH_RF22::UnmodulatedCarrier);
+
+}
+
+void loop()
+{
+  rf22.setModeTx();
+  delay(1000);
+  rf22.setModeIdle();
+  delay(1000);
+}