Reduce CPU usage

joydance/__init__.py

@@ -69,7 +69,6 @@ class JoyDance:
         self.available_shortcuts = set()
 
         self.accel_data = []
-        self.last_accels = []
 
         self.ws = None
         self.disconnected = False
@@ -242,34 +241,46 @@ class JoyDance:
         async for message in self.ws:
             await self.on_message(message)
 
+    async def sleep_approx(self, target_duration):
+        tmp_duration = target_duration
+        x = 0.3
+        start = time.time()
+        while True:
+            tmp_duration = tmp_duration * x
+            await asyncio.sleep(tmp_duration)
+
+            dt = time.time() - start
+            if dt >= target_duration:
+                break
+
+            tmp_duration = target_duration - dt
+
     async def tick(self):
-        sleep_duration = FRAME_DURATION * 0.75
-        last_time = time.time()
+        sleep_duration = FRAME_DURATION
         frames = 0
 
         while True:
             if self.disconnected:
                 break
 
-            # Make sure it runs at exactly 60 FPS
-            while True:
-                time_now = time.time()
-                dt = time_now - last_time
-                if dt >= FRAME_DURATION:
-                    break
-            last_time = time_now
-            frames = frames + 1 if frames < 3 else 1
-
             if not self.should_start_accelerometer:
-                await asyncio.sleep(sleep_duration),
+                frames = 0
+                await asyncio.sleep(sleep_duration)
                 continue
 
-            await asyncio.gather(
-                asyncio.sleep(sleep_duration),
-                self.collect_accelerometer_data(frames),
-            )
+            last_time = time.time()
+            frames = frames + 1 if frames < 3 else 1
 
-    async def collect_accelerometer_data(self, frames):
+            await asyncio.gather(
+                self.sleep_approx(sleep_duration),
+                self.collect_accelerometer_data(),
+            )
+            await self.send_accelerometer_data(frames)
+
+            dt = time.time() - last_time
+            sleep_duration = FRAME_DURATION - (dt - sleep_duration)
+
+    async def collect_accelerometer_data(self):
         if self.disconnected:
             return
 
@@ -278,25 +289,15 @@ class JoyDance:
             return
 
         try:
-            start = time.time()
-            max_runtime = FRAME_DURATION * 0.5
-            while time.time() - start < max_runtime:
-                # Make sure accelerometer axes are changed
-                accels = self.joycon.get_accels()  # [(x, y, z),...]
-                if accels != self.last_accels:
-                    self.last_accels = accels
-                    break
+            accels = self.joycon.get_accels()  # (x, y, z)
 
             # Accelerator axes on phone & Joy-Con are different so we need to swap some axes
             # https://github.com/dekuNukem/Nintendo_Switch_Reverse_Engineering/blob/master/imu_sensor_notes.md
-            for accel in accels:
-                x = accel[1] * -1
-                y = accel[0]
-                z = accel[2]
-
-                self.accel_data.append([x, y, z])
-
-            await self.send_accelerometer_data(frames),
+            accel = accels[2]
+            x = accel[1] * -1
+            y = accel[0]
+            z = accel[2]
+            self.accel_data.append([x, y, z])
         except OSError:
             self.disconnect()
             return

joydance/constants.py

@@ -15,7 +15,8 @@ WS_SUBPROTOCOLS[WsSubprotocolVersion.V1.value] = 'v1.phonescoring.jd.ubisoft.com
 WS_SUBPROTOCOLS[WsSubprotocolVersion.V2.value] = 'v2.phonescoring.jd.ubisoft.com'
 
 FRAME_DURATION = 1 / 60
-ACCEL_ACQUISITION_FREQ_HZ = 200  # Hz
+SEND_FREQ_MS = 0.005
+ACCEL_ACQUISITION_FREQ_HZ = 60  # Hz
 ACCEL_ACQUISITION_LATENCY = 40  # ms
 ACCEL_MAX_RANGE = 8  # ±G