- Name:
- symbol
- Syntax:
-
SYMBOL symbolname = value
SYMBOL symbolname = value ?? constant
Symbolname - is a text string which must begin with an alpha-character or '_'. After the first character, it can also contains number characters ('0'-'9').
Value - is a variable or constant which is being given an alternate symbolname.
?? - can be any supported mathematical function e.g. + - * / etc.
- Description:
-
Assign a value to a new symbol name or create an alias for a variable name.
Mathematical operators can also be used on constants (not variables) Symbols are used to rename constants or variables to make them easier to remember during a program. Symbols have no effect on program length as they are converted back into 'numbers' before the download. Symbols can contain numeric characters, but must not start with a numeric character.
Naturally symbol names cannot be command names or reserved words such as input, step, etc. The list of reserved words is listed in the appendix in part 3 of the manual. When using input and output pin definitions take care to use the term 'pin0' not '0' when describing input variables to be used within if...then statements.
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Use of symbols
Use symbols instead of output, input and variable numbers
- Code Example:
-
symbol RED_LED = B.7 ; define a output pin symbol PUSH_SW = pinC.1 ; define a input switch symbol DELAY = b0 ; define a variable symbol let DELAY = 200 ; preload counter with 200 main: high RED_LED ; switch on output 7 pause DELAY ; wait 0.2 seconds low RED_LED ; switch off output 7 pause DELAY ; wait 0.2 seconds goto main ; loop back to start
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