Theoretical implementation of tick

Completely untested

platformio.ini

@@ -14,6 +14,5 @@ board = esp12e
 framework = arduino
 upload_speed = 115200
 lib_deps =
-  Hash
   ArduinoJson
   ESP Async WebServer

src/main.cpp

@@ -96,11 +96,14 @@ void setup()
   WiFi.mode(WIFI_OFF);
 
   #ifdef SerialDebug
-  // onEvent is already deprecated, but since I'm only using it
-  // for debug purposes we'll see how long it lasts...
-  WiFi.onEvent(wifiEvent);
-  _d("WiFi :: MAC address: ");
-  _dln(WiFi.macAddress());
+    // onEvent is already deprecated, but since I'm only using it
+    // for debug purposes we'll see how long it lasts...
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+    WiFi.onEvent(wifiEvent);
+    _d("WiFi :: MAC address: ");
+    _dln(WiFi.macAddress());
+    #pragma GCC diagnostic pop
   #endif
 
   initWiFi();

src/stairs.cpp

@@ -37,61 +37,95 @@ void Stairs::init(PCA9685* pwmDriver)
 }
 
 
-/*
-struct Step
+uint8_t Stairs::ease(uint8_t startValue, uint8_t targetValue, uint16_t transitionTime, uint16_t elapsedTime)
 {
-  uint16_t currentValue;
-  uint16_t startValue;
-  uint16_t targetValue;
-  uint16_t startTime;
-  uint16_t endTime;
-};
-*/
+  bool up = targetValue > startValue;
 
+  uint16_t diff = up ? targetValue - startValue : startValue - targetValue;
+  uint16_t delta = (diff * elapsedTime) / transitionTime;
+
+  int16_t currentValue = up ? startValue + delta : startValue - delta;
+  if (currentValue < 0) currentValue = 0;
+  if (currentValue > 255) currentValue = 255;
+
+  return currentValue;
+}
+
+
+inline void Stairs::updateCurrentValue(Step* stepState)
+{
+  int32_t stepElapsedTime = -stepState->startTime;
+  stepState->currentValue = ease(stepState->startValue, stepState->targetValue, stepState->remainingTime + stepElapsedTime, stepElapsedTime);
+}
+
+
+inline void Stairs::applyCurrentValue(uint8_t step)
+{
+  mPWMDriver->setPWM(step, this->getPWMValue(step, mStep[step].currentValue));
+}
 
 
 void Stairs::tick()
 {
   if (!mTick) return;
+
+  uint32_t elapsedTime = mLastTransitionTime != 0 ? currentTime - mLastTransitionTime : 0;
+  if (!elapsedTime) return;
+
+
+  mLastTransitionTime = currentTime;
   mTick = false;
 
-  uint32_t elapsedTime = mTransitionStart != 0 ? currentTime - mTransitionStart : 0;
 
   for (uint8_t step = 0; step < stepsSettings->count(); step++)
   {
-    if (mStep[step].currentValue != mStep[step].targetValue)
+    Step* stepState = &mStep[step];
+
+    if (stepState->currentValue != stepState->targetValue)
     {
-      // TODO more maths!
+      // If there is a startup delay request, wait for it first
+      if (stepState->startTime > 0)
+      {
+        stepState->startTime -= elapsedTime;
+        if (stepState->startTime < 0)
+        {
+          if (stepState->remainingTime > -stepState->startTime)
+          {
+            // Shift the remaining time equally
+            stepState->remainingTime += stepState->startTime;
+            updateCurrentValue(stepState);
+            mTick = true;
+          }
+          else
+          {
+            // End of the transition
+            stepState->remainingTime = 0;
+            stepState->currentValue = stepState->targetValue;
+          }
 
-      /*
-      uint32_t diff = this->easeState == Up ? this->parameters.brightness - this->easeStartBrightness : this->easeStartBrightness - this->parameters.brightness;
-      uint32_t delta = (diff * elapsedTime) / this->parameters.easeTime;
+          applyCurrentValue(step);
+        }
+      }
+      else if (elapsedTime >= stepState->remainingTime)
+      {
+        // End of the transition
+        stepState->remainingTime = 0;
+        stepState->currentValue = stepState->targetValue;
 
-  this->currentBrightness = this->easeState == Up ? this->easeStartBrightness + delta : this->easeStartBrightness - delta;
+        applyCurrentValue(step);
+      }
+      else
+      {
+        stepState->startTime -= elapsedTime;
+        stepState->remainingTime -= elapsedTime;
 
+        updateCurrentValue(stepState);
+        applyCurrentValue(step);
 
-  if (elapsedTime >= this->parameters.easeTime)
-  {
-    this->currentBrightness = this->parameters.brightness;
-    this->easeState = None;
-  }
-
-
-
-
-  t /= d/2;
-  if (t < 1) return c/2*t*t + b;
-  t--;
-  return -c/2 * (t*(t-2) - 1) + b;
-};
-
-*/
+        mTick = true;
+      }
     }
   }
-
-  // TODO
-  //  mPWMDriver->setPWM(step, this->getPWMValue(step, brightness));
-
 }
 
 
@@ -108,21 +142,14 @@ void Stairs::set(uint8_t step, uint8_t brightness, uint16_t transitionTime, uint
   if (mStep[step].currentValue == brightness)
     return;
 
-  // TODO continue transition if one is already going on
-
   mTick = true;
   mStep[step].targetValue = brightness;
 
   if (transitionTime > 0)
   {
-    mTransitionStart = currentTime;
     mStep[step].startValue = mStep[step].currentValue;
     mStep[step].startTime = startTime;
-    mStep[step].endTime = transitionTime;
-  }
-  else
-  {
-    mTransitionStart = 0;
+    mStep[step].remainingTime = transitionTime;
   }
 }
 

src/stairs.h

@@ -7,11 +7,11 @@
 
 struct Step
 {
-  uint16_t currentValue;
-  uint16_t startValue;
-  uint16_t targetValue;
-  uint16_t startTime;
-  uint16_t endTime;
+  uint8_t currentValue;
+  uint8_t startValue;
+  uint8_t targetValue;
+  int16_t startTime;
+  uint16_t remainingTime;
 };
 
 
@@ -21,10 +21,13 @@ class Stairs
     PCA9685* mPWMDriver;
     Step mStep[MaxStepCount];
 
-    uint32_t mTransitionStart;
+    uint32_t mLastTransitionTime;
     bool mTick = false;
 
   protected:
+    uint8_t ease(uint8_t startValue, uint8_t targetValue, uint16_t transitionTime, uint16_t elapsedTime);
+    inline void updateCurrentValue(Step* stepState);
+    inline void applyCurrentValue(uint8_t step);
     uint16_t getPWMValue(uint8_t step, uint8_t brightness);
 
   public: