C語言巨集定義技巧

轉載自:
http://miaozl.spaces.live.com/?_c11_blogpart_blogpart=blogview&_c=blogpart&_c02_owner=1&partqs=amonth%3d2%26ayear%3d2007


C語言巨集定義技巧
1，防止一個頭檔被重複包含 

#ifndef COMDEF_H

#define COMDEF_H

//頭檔內容

#endif 
2，重新定義一些類型，防止由於各種平臺和編譯器的不同，而產生的類型位元組數差異，方便移植。 

[Arduino]參考資料

[Arduino] setup() loop() 不在*.ino草稿檔中，如何做？

一般而言在Arduino中，開啟新檔後，就會在其INO檔中看到setup()及loop()這二個函數

例如：
Blink.ino 內容如下：
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}

本文打算要來把setup和loop這二個函數搬位置，應該如何實現呢？
在開啟新的arduino檔案時，會有一個INO檔
我們可以加入其它的檔案，如*.h的標頭檔，或是*.cpp的檔

RamPs1.4 基本組裝與步進馬達測試

RamPs1.4 基本組裝與步進馬達測試
1、安裝好Arduino IDE程式，並裝好Aduino Mega 2560的驅動程式
2、將RamPs1.4模組組裝到Mega 2560上，並將RamPs1.4上的步進馬達Jumpper選擇至所需的檔位
3、插入A4988步進馬達驅動器組裝至RamPs1.4上。請注意方向

[Arduino] 指令表 (出自於www.arduino.cc)

出處：https://www.arduino.cc/en/Reference/HomePage

Structure setup() loop() Control Structures if if...else for switch case while do... while break continue return goto Further Syntax ; (semicolon) {} (curly braces) // (single line comment) /* */ (multi-line comment) #define #include Arithmetic Operators = (assignment operator) +  (addition) - (subtraction) * (multiplication) / (division) % (modulo) Comparison Operators == (equal to) != (not equal to) < (less than) > (greater than) <= (less than or equal to) >= (greater than or equal to) Boolean Operators && (and) || (or) ! (not) Pointer Access Operators * dereference operator & reference operator Bitwise Operators & (bitwise and) | (bitwise or) ^ (bitwise xor) ~ (bitwise not) << (bitshift left) >> (bitshift right) Compound Operators ++ (increment) -- (decrement) += (compound addition) -= (compound subtraction) *= (compound multiplication) /= (compound division) %= (compound modulo) &= (compound bitwise and) |= (compound bitwise or)

Variables Constants HIGH | LOW INPUT | OUTPUT | INPUT_PULLUP LED_BUILTIN true | false integer constants floating point constants Data Types void boolean char unsigned char byte int unsigned int word long unsigned long short float double string - char array String - object array Conversion char() byte() int() word() long() float() Variable Scope & Qualifiers variable scope static volatile const Utilities sizeof() PROGMEM

Functions Digital I/O pinMode() digitalWrite() digitalRead() Analog I/O analogReference() analogRead() analogWrite() - PWM Due & Zero only analogReadResolution() analogWriteResolution() Advanced I/O tone() noTone() shiftOut() shiftIn() pulseIn() Time millis() micros() delay() delayMicroseconds() Math min() max() abs() constrain() map() pow() sqrt() Trigonometry sin() cos() tan() Characters isAlphaNumeric() isAlpha() isAscii() isWhitespace() isControl() isDigit() isGraph() isLowerCase() isPrintable() isPunct() isSpace() isUpperCase() isHexadecimalDigit() Random Numbers randomSeed() random() Bits and Bytes lowByte() highByte() bitRead() bitWrite() bitSet() bitClear() bit() External Interrupts attachInterrupt() detachInterrupt() Interrupts interrupts() noInterrupts() Communication Serial Stream USB (32u4 based boards and Due/Zero only) Keyboard Mouse

[Arduino] C前置處理

 C 前置處理

對於一個 C 程式 編譯之前， C 編譯器 會先處理 C 程式 中含有
 #define、#undef、#if、#ifdef、#ifndef、#endif、#elif、#else 及 #include 敘述， 將之置換成一新 C 程式， 再將之編譯 成一 assembly 程式， 再轉成 machine code(或 object code)。 再經由 linker 變成一執行檔。