Add tempo, live status

pyleds/lib/Tempo.py

@@ -0,0 +1,45 @@
+import time
+from typing import Optional
+
+
+class Tempo(object):
+    _last_beat: float
+    _override_beat: Optional[float] = None
+    
+    def __init__(self, bpm: float = 60):
+        self._bpm: float = bpm
+        self.update_last_beat()
+    
+    def set_bpm(self, bpm: float) -> None:
+        self._bpm = bpm
+    
+    def get_bpm(self) -> float:
+        return self._bpm
+    
+    def update_last_beat(self) -> None:
+        self._last_beat = time.time()
+    
+    def get_beat_time(self) -> float:
+        return 1000 / (self._bpm / 60)
+    
+    def get_beat_delay(self) -> Optional[float]:
+        tick = self._override_beat
+        if tick is None:
+            return None
+        self._override_beat = None
+        return tick - self._last_beat
+    
+    def sync_beat(self):
+        self._override_beat = time.time()
+        
+    def wait(self, beat_divider: int = 1):
+        now = time.time()
+        next_beat = self._last_beat + (self.get_beat_time() / beat_divider / 1000)
+        wait_time = next_beat - now
+        beat_delay = self.get_beat_delay()
+        if beat_delay is not None:
+            wait_time += beat_delay
+        if wait_time > 0:
+            time.sleep(wait_time)
+        self.update_last_beat()
+        return True