Implement random-movement credit in the constant acceleration detector.

This makes it more forgiving of constant acceleration mid-movement, if
the beginning of the movement looks random. Handy for mice that for some
reason generate bot-like constant velocities.

Upstream/Inc/build_config.h

@@ -43,8 +43,9 @@
 #ifdef CONFIG_MOUSE_BOT_DETECT_ENABLED
     //-----------------------------------------------------------
     //Adjust these thresholds first to tune mouse bot detection. Lower values = more sensitive
-    #define MOUSE_BOTDETECT_JUMP_VELOCITY_THRESHOLD         20      //Varies by mouse. Most short jumps are <= 10
-    #define MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_COUNT    30      //20 is ok for most mice. But some mice (or users!) generate longer sequences.
+    #define MOUSE_BOTDETECT_JUMP_VELOCITY_THRESHOLD         20      //Varies by mouse. Most short jumps are <= 10 velocity
+    #define MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_LIMIT    30      //10 is ok for most mice. But some mice (or users!) generate longer sequences.
+    #define MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_CREDIT   40      //Non-constant-acceleration movements can build a credit that will be used before hitting the ACCEL_COUNT limit above. Handy for mice or users that exhibit constant velocity characteristics mid-movement.
     //-----------------------------------------------------------
 
     #define MOUSE_BOTDETECT_VELOCITY_MULTIPLIER             10

Upstream/Src/upstream_hid_botdetect.c

@@ -63,10 +63,11 @@ volatile LockoutStateTypeDef    LockoutState = LOCKOUT_STATE_INACTIVE;
     //Constant acceleration detection stuff
     uint16_t    MouseVelocityHistory[MOUSE_BOTDETECT_VELOCITY_HISTORY_SIZE] = {0};
     int32_t     PreviousSmoothedAcceleration    = 0;
-    uint8_t     ConstantAccelerationCounter     = 0;
+    int8_t      ConstantAccelerationCounter     = 0;
 
     //Debug:
-//    uint8_t     ConstantAccelerationCounterMax  = 0;
+//    int8_t     ConstantAccelerationCounterMax   = 0;
+//    int8_t     ConstantAccelerationCounterMin   = 0;
 
     static void Upstream_HID_BotDetectMouse_DoLockout(void);
 #endif
@@ -406,6 +407,9 @@ void Upstream_HID_BotDetectMouse(uint8_t* mouseInData)
     //Did the mouse stop moving?
     if ((now - LastMouseMoveTime) > ((MOUSE_BOTDETECT_MOVEMENT_STOP_PERIODS * HID_FS_BINTERVAL) - (HID_FS_BINTERVAL / 2)))
     {
+        //Constant acceleration detection
+        ConstantAccelerationCounter = 0;
+
         //Jump detection
         if (MouseIsMoving)
         {
@@ -457,19 +461,20 @@ void Upstream_HID_BotDetectMouse(uint8_t* mouseInData)
                 ((PreviousSmoothedAcceleration - smoothedAccelerationMatchError) <= newSmoothedAcceleration))
             {
                 ConstantAccelerationCounter++;
-                if (ConstantAccelerationCounter > MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_COUNT)
+                if (ConstantAccelerationCounter > MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_LIMIT)
                 {
                     Upstream_HID_BotDetectMouse_DoLockout();
                 }
-
-                //Debug:
-//                if (ConstantAccelerationCounter > ConstantAccelerationCounterMax) ConstantAccelerationCounterMax = ConstantAccelerationCounter;
             }
             else
             {
-                ConstantAccelerationCounter = 0;
+                if (ConstantAccelerationCounter > -MOUSE_BOTDETECT_LOCKOUT_CONSTANT_ACCEL_CREDIT) ConstantAccelerationCounter--;
             }
             PreviousSmoothedAcceleration = newSmoothedAcceleration;
+
+            //Debug:
+//            if (ConstantAccelerationCounter > ConstantAccelerationCounterMax) ConstantAccelerationCounterMax = ConstantAccelerationCounter;
+//            if (ConstantAccelerationCounter < ConstantAccelerationCounterMin) ConstantAccelerationCounterMin = ConstantAccelerationCounter;
         }
     }
     else