Variables in the source code are Identifier named memory cells in RAM (SRAM) or eeprom (eRAM). You can assign values to them and readout their value somewhere else. Detailed description (Wikipedia)
Variables have Object features:
features of numeric standard variables (boolean, byte, word, integer, long, single, ..) | |||
---|---|---|---|
Name | Description | Type | read/write |
.0-x1) | Bit n of the variable value | boolean | read+write |
.LowNibble | Low-Nibble of the variable value | byte | read+write |
.HighNibble | High-Nibble of the variable value | byte | read+write |
.Nibblen | Nibble n (1-8) of the variable value | byte | read+write |
.Byten2) | Byte n (1-4) of the variable value | byte | read+write |
.LowByte3) | Low-Byte of the variable value | byte | read+write |
.HighByte4) | High-Byte of the variable value | byte | read+write |
.LowWord5) | lower Word of the variable value | word | read+write |
.HighWord6) | higher Word of the variable value | word | read+write |
.Reverse7) | reverse the Byte order, see also Ce16(), Ce32() | word, long | read |
.Addr8) | Address of the variable 9) | word | read |
.Ptr10) | Address of the memory blocks | word | read |
.SizeOf | Read the number of Bytes the variable reserves. | byte | read |
Methods of Byte and Word arrays | |||
Name | Description | ||
.Sort | Sort array data in ascending order (very fast sorting algorithm) |
The elements Struct inherit Methods/Attributes.
The data type String and MemoryBlock have further Methods and Attributes.
Variables must be declared before they can be accessed. Variables store data values of their Data Type. See also: Dim, Chapter "Visibility of Variables"
A ssen above, you can access individual bytes for read and write operations. You may also access a Bit via another variable which has that Bit number:
Example:
Access via a constant value executes faster:
Example:
dim a,b as byte dim c as word dim s as string c=&ha1b2 ' Assign value, Hexa decimal (lie in reverse order in memory, Hex always Big-endian) a=c.LowByte ' read low Byte of the variable value, result: &hb2 b=c.HighByte ' read High-Byte of the variable value, result: &ha1 c.LowByte=b ' reverse and write c.HighByte=a c.0=1 'set Bit 0 in c a=b.7 'read Bit 7 of b a=3 c=b.a ' read Bit 3 of b, Bit number is in a Print "&h"+hex(c) ' Display: &hb2a1 s = "Hallo" ' assign text a = s.ByteValue(1) ' Read decimal value of the 1. character of the string
See also