c++ - Arduino uint8_t 变量

Question

我在处理一些 arduino 代码时遇到了问题。我正在使用我找到的以太网教程代码和我找到的一些 IR 发射器和接收器代码，我正在尝试将它们结合起来。

http://www.ladyada.net/learn/sensors/ir.html

http://g33k.blogspot.com/2010/09/arduino-data-webserver-sample-web.html

这两种代码本身都可以正常工作。

代码可以编译，但是当我调用以下 void IRDetector() 时，它不起作用。我调试了它，到目前为止我发现我使用变量 uint8_t 或 uint16_t(我尝试用 int 和 long 替换它们)。我必须导入和库才能使用 uint8_t 吗？有什么想法吗？

如有任何帮助，我们将不胜感激。

 uint16_t pulses[100][2];  // pair is high and low pulse 
   uint8_t currentpulse = 0; // index for pulses we're storing

    uint8_t highpulse, lowpulse;  // temporary storage timing

      void IRDetectCode(void)
   {
    while(true){

highpulse = lowpulse = 0; // start out with no pulse length

while (IRpin_PIN & (1 << IRpin)) {
  // pin is still HIGH

  // count off another few microseconds
  highpulse++;
  delayMicroseconds(RESOLUTION);

  // If the pulse is too long, we 'timed out' - either nothing
  // was received or the code is finished, so print what
  // we've grabbed so far, and then reset
  if ((highpulse >= MAXPULSE) && (currentpulse != 0)) {
     Serial.print(" usec, ");
  //  printpulses();
    //currentpulse=0;
    return;
  }
}
// we didn't time out so lets stash the reading
pulses[currentpulse][0] = highpulse;

// same as above
while (! (IRpin_PIN & _BV(IRpin))) {
  // pin is still LOW
   Serial.print(" usec, ");
  lowpulse++;
  delayMicroseconds(RESOLUTION);
  if ((lowpulse >= MAXPULSE)  && (currentpulse != 0)) {
  //  printpulses();
  //  currentpulse=0;
    return;
  }
}
//pulses[currentpulse][1] = lowpulse;

          // we read one high-low pulse successfully, continue!
       currentpulse++;
  }
    }

  void printpulses(void) {
        Serial.println("\n\r\n\rReceived: \n\rOFF \tON");
         for (uint8_t i = 0; i < currentpulse; i++) {
            Serial.print(pulses[i][0] * RESOLUTION, DEC);
            Serial.print(" usec, ");
            Serial.print(pulses[i][1] * RESOLUTION, DEC);
            Serial.println(" usec");
           }

         // print it in a 'array' format
     Serial.println("int IRsignal[] = {");
     Serial.println("// ON, OFF (in 10's of microseconds)");
         for (uint8_t i = 0; i < currentpulse-1; i++) {
             Serial.print("\t"); // tab
             Serial.print(pulses[i][1] * RESOLUTION / 10, DEC);
             Serial.print(", ");
            Serial.print(pulses[i+1][0] * RESOLUTION / 10, DEC);
           Serial.println(",");
        }
          Serial.print("\t"); // tab
     Serial.print(pulses[currentpulse-1][1] * RESOLUTION / 10, DEC);
      Serial.print(", 0};");
        }

Answer 1

uint8_t 是一个 8 位无符号整数。在 Arduino 中，它被称为“字节”，因此您可以这样使用它:

for (byte i = 0; i < currentpulse; i++) {....

它比使用 Arduino 的“int”类型(== int16_t)或“unsigned int”(== uint16_t)要好得多，因为 ATmega328 是 8 位的。因此处理 8 位 var 更快(很多)。

希望对您有所帮助。