Name:
loop
Syntax:

DO
  {code}
LOOP

DO WHILE/UNTIL condition
  {code}
LOOP

DO
  {code}
LOOP WHILE/UNTIL condition

Condition  - The condition which will cause the associated code commands to be executed or not.

Code - Command statements which will be executed dependant upon the evaluation of the condition.

Description:

Indicates the end of a do..loop block, a section of code that will execute continuously, or while or until a condition is met.


Conditions

The condition determine whether the code will be executed or not. Each condition takes the form -

  variable comparison value
 

The variable's value is compared with the value to determine if the condition is met. For example -

DO WHILE pinC.1 = 0
  TOGGLE B.7
LOOP

or  
  variable comparison variable
 

The left variable's value is compared with the right variable's value to determine if the condition is met. For example -

DO WHILE b0 < b1
  TOGGLE B.7
  b0 = b0 + 1
LOOP

The comparison operator may be any of ...

  = equal to
  is equal to
  <> not equal to
  != not equal to
  > greater than
  < less than
  >= greater than or equal to
  <= less than or equal to

Note that when testing an input pin, the 'pin' variable name must be used and not the pin number or the pin's port.number label. For example -

  DO WHILE pin2 = 1
  LOOP UNTIL pinC.0 = 0

If the 'pin' variable name is not specified a 'syntax error' will likely be raised for the 'do' or 'loop' command. Care needs to be taken when specifying an input pin to test using the symbol command.


Multiple conditions

Multiple conditions may be specified in a 'do' or 'loop' conditional command. These can either be 'and' or 'or' combinations -

  condition AND condition
  condition OR condition

An 'and' combined condition will only evaluate as true when both conditions are true while an 'or' combined condition  will evalauate as true when either condition is true.

It is possible to add addditional 'and' or 'or' combinations but it is recommended not to mix both in a combined conditional. For example -

  DO WHILE pin2 = 1 AND pin4 = 1
  LOOP UNTIL b0 = 2 OR b3 > b4

 

DO
  {code}
LOOP

The code within the do...loop will be continually executed.  An exit command can be used to exit out of the do...loop, execution will continue after the 'loop' command.

 

DO WHILE condition
 
{code}
LOOP
  DO UNTIL condition
  {code}
LOOP

The code within the do...loop will execute while (or until) the specfied condition is met.  An exit command can be used to exit out of the do...loop, execution will immediately continue after the 'loop' command.

 

DO
 
{code}
LOOP WHILE condition
  DO
  {code}
LOOP UNTIL condition

The code within the do...loop will execute at least once and continule to execute while (or until) the specfied condition is met.  An exit command can be used to exit out of the do...loop, execution will immediately continue after the 'loop' command.

Applies To:
All
See Also:
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    A do / loop while structure

    Flash an LED 5 times

    Code Example:
    	let b2 = 1			'reset vaiable b2 to 1
    	do
    	  high B.1			'turn on the LED on B.1
    	  pause 1000			'wait 1 second
    	  low B.1			'turn off the LED on B.1
    	  pause 1000			'wait 1 second
    	  inc b2			'increment the loop counter
    	  if pinC.1 = 1 then exit	'exit the loop early if C.1 is high
    	loop while b2 < 5		'otherwise loop 
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