travis build

different configurations are specified in the configurations directory
 to select one copy it replcing the config.h file (as the travis script does)
 or change the include file directive in crossbow.ino

crossbow/qsp.h

@@ -0,0 +1,21 @@
+#include "Arduino.h"
+
+void qspDecodeRcDataFrame(QspConfiguration_t *qsp, RxDeviceState_t *rxDeviceSate);
+void decodeRxHealthPayload(QspConfiguration_t *qsp, RxDeviceState_t *rxDeviceState);
+
+uint8_t get10bitHighShift(uint8_t channel);
+uint8_t get10bitLowShift(uint8_t channel);
+void qspComputeCrc(QspConfiguration_t *qsp, uint8_t dataByte);
+void encodeRxHealthPayload(QspConfiguration_t *qsp, RxDeviceState_t *rxDeviceState, volatile RadioState_t *radioState);
+void encodeRcDataPayload(QspConfiguration_t *qsp, volatile int16_t channels[], uint8_t noOfChannels);
+void qspDecodeIncomingFrame(
+    QspConfiguration_t *qsp, 
+    uint8_t incomingByte, 
+    RxDeviceState_t *rxDeviceState,
+    TxDeviceState_t *txDeviceState,
+    volatile RadioState_t *radioState
+);
+void qspClearPayload(QspConfiguration_t *qsp);
+void qspEncodeFrame(QspConfiguration_t *qsp, uint8_t buffer[], uint8_t *size);
+
+void encodePingPayload(QspConfiguration_t *qsp, uint32_t currentMicros);