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--- arduino_rotary_encoder [2022/02/05 13:45]
gongyusu
+++ arduino_rotary_encoder [2022/02/05 13:53] (当前版本)
gongyusu [2. 参考技术资料]
@@ 行 4: / 行 4: @@
   * {{ :circuit-schematic-v2.jpg |}}
   * {{ :close-view-v2.jpg |}}
-  * {{ :filtered-signal-v2 |}}
+  * {{ :filtered-signal-v2.jpg |}}
   * {{ :top-view-v2.jpg |}}
+### 2. 代码示例
+初始化管脚以及中断服务程序
+<code c>
+#include
+#include
+#include
+volatile byte seqA = 0;
+volatile byte seqB = 0;
+volatile byte cnt1 = 0;
+volatile byte cnt2 = 0;
+volatile boolean right = false;
+volatile boolean left = false;
+volatile boolean button = false;
+boolean backlight = true;
+byte menuitem = 1;
+byte page = 1;
+Adafruit_PCD8544 display = Adafruit_PCD8544(13, 12,11, 8, 10);
+void setup() {
+  pinMode(A0, INPUT);
+  pinMode(A1, INPUT);
+  pinMode(A2, INPUT);
+  // Enable internal pull-up resistors
+  digitalWrite(A0, HIGH);
+  digitalWrite(A1, HIGH);
+  digitalWrite(A2, HIGH);
+  // Turn on LCD backlight
+  pinMode(9, OUTPUT);
+  digitalWrite(9, HIGH);
+  PCICR =  0b00000010; // 1. PCIE1: Pin Change Interrupt Enable 1
+  PCMSK1 = 0b00000111; // Enable Pin Change Interrupt for A0, A1, A2
+  // Initialize LCD
+  display.setRotation(2); // Set LDC orientation
+  display.begin(60);      // Set LCD contrast
+  display.clearDisplay(); // Clear display
+  display.display();      // Apply changes
+  sei();
+}
+void loop() {
+  // Create Menu Pages
+  if (page==1) {
+    display.setTextSize(1);
+    display.clearDisplay();
+    display.setTextColor(BLACK, WHITE);
+    display.setCursor(15, 0);
+    display.print("MAIN MENU");
+    display.drawFastHLine(0,10,83,BLACK);
+    display.setCursor(0, 15);
+    if (menuitem==1) { display.setTextColor(WHITE, BLACK);}
+    else {display.setTextColor(BLACK, WHITE);}
+    display.print(">Contrast: 99%");
+    display.setCursor(0, 25);
+    if (menuitem==2) { display.setTextColor(WHITE, BLACK);}
+    else {display.setTextColor(BLACK, WHITE);}
+    display.print(">Test Encoder");
+    if (menuitem==3) { display.setTextColor(WHITE, BLACK);}
+    else {display.setTextColor(BLACK, WHITE);}
+    display.setCursor(0, 35);
+    display.print(">Backlight:");
+    if (backlight) {display.print("ON");}
+    else {display.print("OFF");}
+    display.display();}
+  else if (page==2) {
+    display.setTextSize(1);
+    display.clearDisplay();
+    display.setTextColor(BLACK, WHITE);
+    display.setCursor(15, 0);
+    display.print("ENC. TEST");
+    display.drawFastHLine(0,10,83,BLACK);
+    display.setCursor(5, 15);
+    display.print("LEFT    RIGHT");
+    display.setTextSize(2);
+    display.setCursor(5, 25);
+    display.print(cnt1);
+    display.setCursor(55, 25);
+    display.print(cnt2);
+    display.setTextSize(2);
+    display.display();
+  }
+  // Take action if a new command received from the encoder
+  if (left) {
+    left = false;
+    menuitem--;
+    if (menuitem==0) {menuitem=3;}
+  }
+  if (right) {
+    right = false;
+    menuitem++;
+    if (menuitem==4) {menuitem=1;}
+  }
+  if (button) {
+    button = false;
+    if (page == 1 && menuitem==3) {
+      digitalWrite(9, LOW);
+      if (backlight) {backlight = false; digitalWrite(9, LOW);}
+      else {backlight = true; digitalWrite(9, HIGH);}
+      }
+    else if (page == 1 && menuitem==2) {
+      page=2;
+      cnt1=0;
+      cnt2=0;
+     }
+    else if (page == 2) {
+      page=1;
+     }
+   }
+  }
+ISR (PCINT1_vect) {
+// If interrupt is triggered by the button
+  if (!digitalRead(A0)) {
+    button = true;}
+// Else if interrupt is triggered by encoder signals
+  else {
+    // Read A and B signals
+    boolean A_val = digitalRead(A1);
+    boolean B_val = digitalRead(A2);
+    // Record the A and B signals in seperate sequences
+    seqA <<= 1;
+    seqA |= A_val;
+    seqB <<= 1;
+    seqB |= B_val;
+    // Mask the MSB four bits
+    seqA &= 0b00001111;
+    seqB &= 0b00001111;
+    // Compare the recorded sequence with the expected sequence
+    if (seqA == 0b00001001 && seqB == 0b00000011) {
+      cnt1++;
+      left = true;
+      }
+    if (seqA == 0b00000011 && seqB == 0b00001001) {
+      cnt2++;
+      right = true;
+      }
+  }
+}
+</code>
 ### 2. 参考技术资料
   * [[https://microcontrollerslab.com/rotary-encoder-arduino-tutorial/|Rotary Encoder Module with Arduino]]
+  * [[https://www.electronicshub.org/arduino-rotary-encoder/|Rotary Encoder With Arduino – Know it all]]