optimize updatebycolumn function to only flip necessary dots

flipcontrol_esp32/include/image.h

@@ -10,8 +10,6 @@
 #define ROWS 16
 
 
-#define UPDATE_INTERVAL 5 //TODO: remove this
-
 enum UpdateReturn {
     wait,
     finished,
@@ -37,8 +35,9 @@ private:
 
     unsigned long lastUpdateMillis; //time when last dots where started flipping
 
-    unsigned long updateInterval;
+    unsigned long updateDelay;
 
+    void serialPrintInt(uint16_t source);
     
 
 

flipcontrol_esp32/src/flipdot.cpp

@@ -61,6 +61,7 @@ void Flipdot::selectColumnSet(uint8_t selcolumn) {
     selectColumn(selcolumn, false);
 }
 void Flipdot::selectColumn(uint8_t selcolumn, bool clear) {
+    //set shift registers for columns to select one column to positive voltage
     uint8_t sc_bit=3-(selcolumn%4); //each two shift registers control four columns
     uint8_t sc_byte=selcolumn/4;
 

flipcontrol_esp32/src/image.cpp

@@ -8,13 +8,19 @@ Image::Image()
   
 }
 
+void Image::serialPrintInt(uint16_t source)
+{
+    for(uint8_t i = 0; i < 16; i++)
+        Serial.print((source & (1 << i)) > 0);
+}
+
 void Image::init()
 {
     flipdot.init(); //sets pin modes etc.
 
     flag_updating=false;
     update_counter=0;
-    updateInterval=30;
+    updateDelay=5;
 }
 
 uint8_t Image::getW() {
@@ -63,34 +69,53 @@ UpdateReturn Image::updateByColumn(bool direction, bool clearFirst, bool optimiz
         return nochange; //finished
     }
 
-    if (millis()-lastUpdateMillis<updateInterval){ //too early
+    if (millis()-lastUpdateMillis<updateDelay){ //too early
         return wait; //not finished
     }
 
+    unsigned long functionStartMillis=millis();
+
     
-    lastUpdateMillis=millis();
 
     uint8_t x=update_counter/2;
+    bool setDot= (update_counter%2==1);
 
-    if (update_counter%2==0) { //even counter numbers are for clearing
+    if (!setDot) { //even counter numbers are for clearing
+        uint16_t _colClear=frontBuffer[x]& ~backBuffer[x]; //Front & ~Back = Which bits have to be cleared
+
+        if (!optimizeClear || _colClear>0) { //at least on dot has to be cleared in this column
             flipdot.setRow(0);
             flipdot.selectColumnClear(x);
+
             if (!flipdot.clearSelectedColumn()) {
                 Serial.println("Error clearing column!");
             }
+            lastUpdateMillis=millis();
             frontBuffer[x]=0;
-    }else{ //odd counter numbers are for setting
+        }
-        flipdot.selectColumnSet(x); //lower column number is on the left
 
-        flipdot.setRow(backBuffer[x]);
+    }else{ //odd counter numbers are for setting
-        flipdot.setSelectedDot();
+        uint16_t _colSet=backBuffer[x]& ~frontBuffer[x];
+        if (!optimizeSet || _colSet>0) { //at least on dot has to be set in this column (if optimize is enabled)
+            flipdot.selectColumnSet(x); //lower column number is on the left
+            if (!optimizeSet) {
+                flipdot.setRow(backBuffer[x]); //flip all set dots in this column
+            }else{           
+                flipdot.setRow(_colSet); //flip only currently not set dots in this column that have to be set
+            }
+
+            if (!flipdot.setSelectedDot()) {
+                Serial.println("Error setting dots!");
+            }
+            lastUpdateMillis=millis();
 
             frontBuffer[x]=backBuffer[x]; //flip current column in buffer
         }
+    }
 
     update_counter++; //next column
 
-    unsigned long _duration=millis()-lastUpdateMillis; //how long it took to shift data and flip dots in this update
+    unsigned long _duration=millis()-functionStartMillis; //how long it took to shift data and flip dots in this update
     updateDuration=max(updateDuration,_duration); //store maximum value
     
 

flipcontrol_esp32/src/main.cpp

@@ -33,7 +33,7 @@ void loop() {
         //flip.setBuffer_solid(color);
         //color=1-color;
 
-        uint8_t _randomvalue=random(256);
+        uint8_t _randomvalue=random(64);
         Serial.print("set buffer random. ");
         Serial.println(_randomvalue);
         flip.setBuffer_random(_randomvalue);
@@ -42,7 +42,7 @@ void loop() {
     }
 
 
-    UpdateReturn result=flip.updateByColumn(0,0,0,0); //0=not finished, 1=finished
+    UpdateReturn result=flip.updateByColumn(0,0,true,true); //0=not finished, 1=finished
     if (result == finished) //just finished
     {
         unsigned long duration=millis()-last_change;
@@ -51,29 +51,4 @@ void loop() {
         flip.updateDuration=0; //reset
     }
     
-
-    /*
-    if (loopmillis > last_update + UPDATE_INTERVAL) 
-    {
-        Serial.print("UpdateByColumn ");
-        bool result=flip.updateByColumn(0,0,0,0);
-        Serial.println(result);
-
-        last_update=loopmillis;
-    }
-    */
-    
-
-    /*
-    if (loopmillis > last_update + UPDATE_INTERVAL) 
-    {
-        flip.loop_drawClearTest();
-        //loop_testDots();
-
-        last_update=loopmillis;
-    }
-    */
-
-
-    
 }