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| author | Marti Bolivar <mbolivar@mit.edu> | 2010-12-21 10:27:37 -0500 | 
|---|---|---|
| committer | Marti Bolivar <mbolivar@mit.edu> | 2010-12-21 10:27:37 -0500 | 
| commit | c45bccad44187da27505cf5808424e709e3f54a1 (patch) | |
| tree | 18a459a50f8d0551ba046e30462c93999d982725 /docs/source/arduino/static.rst | |
| parent | 84fd2532a7f23d20354ff590790b3f892cb7e7d7 (diff) | |
| parent | d5ad2a27f4e69e6cc9324331945937c983c30366 (diff) | |
| download | librambutan-c45bccad44187da27505cf5808424e709e3f54a1.tar.gz librambutan-c45bccad44187da27505cf5808424e709e3f54a1.zip  | |
Merge branch 'master' into debug-serialusb.
Chose debug-serialusb version in cases of conflict.
Conflicts:
	libmaple/usb/usb_callbacks.c
Diffstat (limited to 'docs/source/arduino/static.rst')
| -rw-r--r-- | docs/source/arduino/static.rst | 71 | 
1 files changed, 0 insertions, 71 deletions
diff --git a/docs/source/arduino/static.rst b/docs/source/arduino/static.rst deleted file mode 100644 index 1c0340e..0000000 --- a/docs/source/arduino/static.rst +++ /dev/null @@ -1,71 +0,0 @@ -.. _arduino-static: - -Static -====== - -The static keyword is used to create variables that are visible to -only one function. However unlike local variables that get created -and destroyed every time a function is called, static variables -persist beyond the function call, preserving their data between -function calls. - - - -Variables declared as static will only be created and initialized -the first time a function is called. - - - -Example -------- - -:: - -     -     -    /* RandomWalk -    * Paul Badger 2007 -    * RandomWalk wanders up and down randomly between two -    * endpoints. The maximum move in one loop is governed by -    * the parameter "stepsize". -    * A static variable is moved up and down a random amount. -    * This technique is also known as "pink noise" and "drunken walk". -    */ -     -    #define randomWalkLowRange -20 -    #define randomWalkHighRange 20 -    int stepsize; -     -    int thisTime; -    int total; -     -    void setup() -    { -      Serial.begin(9600); -    } -     -    void loop() -    {        //  tetst randomWalk function -      stepsize = 5; -      thisTime = randomWalk(stepsize); -      Serial.println(thisTime); -       delay(10); -    } -     -    int randomWalk(int moveSize){ -      static int  place;     // variable to store value in random walk - declared static so that it stores -                             // values in between function calls, but no other functions can change its value -     -      place = place + (random(-moveSize, moveSize + 1)); -     -      if (place < randomWalkLowRange){                    // check lower and upper limits -        place = place + (randomWalkLowRange - place);     // reflect number back in positive direction -      } -      else if(place > randomWalkHighRange){ -        place = place - (place - randomWalkHighRange);     // reflect number back in negative direction -      } -     -      return place; -    } -     -  | 
