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/txbuzzer.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "Arduino.h"
+
+#define PATTERN_CYCLE_OFF 127
+#define PATTERN_CYCLE_ON -1
+#define PATTERN_CYCLE_IGNORE -2
+
+#define PATTERN_MODES_NUMBER 6
+#define PATTERN_ELEMENT_NUMBER 4
+
+enum {
+    BUZZER_MODE_OFF = 0,
+    BUZZER_MODE_CONTINUOUS = 1,
+    BUZZER_MODE_SLOW_BEEP = 2,
+    BUZZER_MODE_FAST_BEEP = 3,
+    BUZZER_MODE_CHIRP = 4,
+    BUZZER_MODE_DOUBLE_CHIRP = 5
+};
+
+struct BuzzerState_t {
+    bool enabled = false; //Continous mode buzzer
+    bool singleModeEnabled = false;
+    uint8_t mode = BUZZER_MODE_OFF;
+    
+    uint32_t updateTime = 0;
+
+    uint8_t tick = 0;
+    uint8_t element = 0;
+    const uint8_t patternMaxTick = 20;
+    const uint8_t patternTickPerdiod = 75;
+
+    const int8_t pattern[PATTERN_MODES_NUMBER][PATTERN_ELEMENT_NUMBER] = {
+        {PATTERN_CYCLE_OFF},
+        {PATTERN_CYCLE_ON},
+        {0, 7, 10, 17},
+        {0, 4, 10, 14},
+        {0, 1, PATTERN_CYCLE_IGNORE, PATTERN_CYCLE_IGNORE},
+        {0, 1, 2, 3}
+    };
+
+};
+
+void buzzerSingleMode(uint8_t mode, BuzzerState_t *buzzer);
+void buzzerContinousMode(uint8_t mode, BuzzerState_t *buzzer);
+void buzzerProcess(uint8_t pin, uint32_t timestamp, BuzzerState_t *buzzer);