need explanation of this little code step by step

[ect_09]

Code: [Select]

do
{ if (Button(&Switch_Port, Switch_Pin, Debounce_Time, 0)) {
 if (!Switch) { LED = ~LED; }
while (!Switch); // Wait for release of the button } }
 while(1); // Infinite Loop }
code is taken from this link
http://embedded-lab.com/blog/?p=164

[Jeroen3]

do{
 if (Button(&Switch_Port, Switch_Pin, Debounce_Time, 0)) {
  if (!Switch) {
   LED = ~LED;
  }
  while (!Switch); // Wait for release of the button
 }
}
while(1); // Infinite Loop
}

Does not compile.
But it should toggle the led is the result of Button() is true and Switch is false. It will continue to the infinite loop when Switch is/becomes true.

[briselec]

Code: [Select]

do{
        if (Button(&Switch_Port, Switch_Pin, Debounce_Time, 0)) {     // calls a library function that debounces  the button press
                if (!Switch) {                   // if Switch is equal to 0.
                        LED = ~LED;        // bitwise negation. If the Switch is equal to 0 and the LED is off it becomes on, on becomes off.
                }
               while (!Switch);            //an empty while loop. execution is stuck here till Switch is not equal to 0.
        }
 } while(1);    // Infinite Loop }       // 1 is always 1 so we're stuck in a continuous do..while loop.