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--- comfilehmi:hmieditor_susik:index [2019/01/05 00:49]
COMFILE Technology [Bitwise Expressions]
+++ comfilehmi:hmieditor_susik:index [2024/02/01 13:27] (current)
COMFILE Technology
@@ Line 1: / Line 1: @@
+====== Internal Variables and Expressions======
+===== Internal Variables =====
+In the ComfileHMI, a //Internal variable// refers to a named location in the ComfileHMI hardware's memory.
+{{ :comfilehmi:hmieditor_susik:hmiandplc2.png?nolink |}}
+If a Internal variable is used without first being declared, it will be implicitly declared and available for use immediately.
+  * All variables are global, so **they must be given unique names**, and can be used on any screen.
+  * Variables can only store numeric values.  Integers, floating point, and even 64-bit integers are supported).
+  * Variables names are case-sensitive and support Unicode, so variable names can be expressed in any language.
+  * Variable names cannot begin with numeric digits; they must begin with a letter or an underscore character.  Variables names should not contain spaces.
+    * A good example for a motor status variable could be //Motor1//
+    * //123abc// is invalid because it begins with a numeric digit
+    * //Motor Status// is invalid because it contains a space
+A list of variables in use can be obtained from Comfile Studio's main menu: //Project//->//View Addresses and Variables in Use//.
+==== String Variables ====
+String variables were added in a subsequent version of Comfile Studio.  They are declared and used with a ''$'' prefix.  For example <html><code>$a=&quot;hello&quot;</code></html>.
+===== Internal Memory =====
+Internal memory is a specific memory region in the ComfileHMI hardware.  It is volatile, so it will be erased when the ComfileHMI hardware is powered off.
+{{ :comfilehmi:hmieditor_susik:arrayexplain2.png?nolink |}}
+There are 1024 memory locations (indexed 0~1023) that can be written and read to.  They can store 64-bit integers and double-precision floating point values.
+  * ''set_mem(index, value)'' : Writes ''value'' to internal memory at ''index''.
+  * ''mem(index)'' : Reads the value current stored in internal memory at ''index''.
+Multiple values can be stored adjacently in internal memory by passing multiple value arguments to the ''set_mem'' function.
+  * ''set_mem(index, value1, value2, ..., valueN)''
+See the [[comfilehmi:hmieditor_function:index#internal_memory_functions|internal memory functions]].
+===== Conditional Expressions =====
+Conditional expressions provide the ability to compare variables.
+''<'',  <html><code><=</code></html>,  ''=='',  ''>='',  ''>'', ''!='' operators are supported.  They are identical to the [[https://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Comparison_operators/relational_operators|comparison operators used in the C programming language]]. \\
+''&&'' and ''||'' are boolean AND and boolean OR operators respectively.
+(Example) \\
+''MotorStatus > 1'' \\
+''Heater1 == 0''      <= ''true'' if ''Heater1'' is equal to 0 \\
+''Heater1 != 0''      <= ''true'' if ''Heater1'' does not equal 0
+===== Mathematical Expressions =====
+''+'',  ''-'',  ''*'',  ''/'',  and ''%'' operators are supported for performing math on variables. They are identical to the [[https://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Arithmetic_operators|arithmetic operators used in the C programming language]].
+(Example)\\
+''MotorStatus + 1''
+===== Bitwise Expressions =====
+<html><code>>></code></html>, <html><code><<</code></html>, ''|'', and ''&'' operators are supported for bitwise operations.  They are identical to the [[https://en.wikipedia.org/wiki/Bitwise_operations_in_C|bitwise operators used in the C programming language]].
+(Example)\\
+<html><code>(bits >> 2) & 1</code></html>
+----
+[[comfilehmi:index#screens| Back to ComfileHMI]]

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