Diff: metronome.hpp

Revision:

0:dbad57390bd1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/metronome.hpp	Sun May 14 18:37:05 2017 +0000
@@ -0,0 +1,37 @@
+#pragma once
+
+#include "mbed.h"
+
+class metronome
+{
+public:
+    enum { beat_samples = 30 };
+
+public:
+    metronome()
+    : m_timing(false), m_beat_count(0) {}
+    ~metronome() {}
+
+public:
+	// Call when entering "learn" mode
+    void start_timing();
+	// Call when leaving "learn" mode
+    void stop_timing();
+
+	// Should only record the current time when timing
+	// Insert the time at the next free position of m_beats
+    void tap();
+
+    bool is_timing() const { return m_timing; }
+	// Calculate the BPM from the deltas between m_beats
+	// Return 0 if there are not enough samples
+    size_t get_bpm() const;
+
+private:
+    bool m_timing;
+    Timer m_timer;
+
+	// Insert new samples at the end of the array, removing the oldest
+    size_t m_beats[beat_samples];
+    size_t m_beat_count;
+};