c++ - 使用 teensy 3.2 的旋转开关

Question

我有一个旋转开关，想与我的 teensy 3.2 一起使用。我有这个代码：

#include <Bounce.h>
Bounce button3 = Bounce(3, 10);   // Key 'Q'
Bounce button4 = Bounce(4, 10);   // Key 'W'
Bounce button5 = Bounce(5, 10);   // Key 'E'
Bounce button6 = Bounce(6, 10);   // Key 'R'
Bounce button7 = Bounce(7, 10);   // Key 'T'

int modeNum;

void setup() {
pinMode(3, INPUT_PULLUP);
pinMode(4, INPUT_PULLUP);
pinMode(5, INPUT_PULLUP);
pinMode(6, INPUT_PULLUP); 
pinMode(7, INPUT_PULLUP);
}

void loop {

button3.update();
button4.update();
button5.update();
button6.update();
button7.update();

 if (button3.read() == LOW)
 {
  if (modeNum != 1)
  {
    modeNum = 1;
    usb_keyboard_press(KEY_Q, 0);
  }
 }
 else if (button4.read() == LOW)
 {
  if (modeNum != 2)
  {
   modeNum = 2;
   usb_keyboard_press(KEY_W, 0);
  }
 }
 else if (button5.read() == LOW)
 {
   if (modeNum != 3)
   {
     modeNum = 3;
     usb_keyboard_press(KEY_E, 0);
   }
 }
 else if (button6.read() == LOW)
 {
   if (modeNum != 4)
   {
     modeNum = 4;
     usb_keyboard_press(KEY_R, 0);
   }
 }
 else if (button7.read() == LOW)
 {
   if (modeNum != 5)
   {
     modeNum = 5;
     usb_keyboard_press(KEY_T, 0);
   }
 }
}

我已正确初始化它。而且我的旋转编码器接线正确。我只是不知道为什么当我旋转表盘时我的代码没有发送击键。