| Embedded IDE Link™ CC | |
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When you create an object that accesses a bitfield symbol in your source code, the object constructor createobj returns a struct object the includes the bitfield as members of the struct object. Bitfields are always parts of structures, so you create struct objects to access bitfields. createobj uses the information in your source code to set the properties of the object appropriately to match the code. Within the properties and their values, you find all the information about the symbol, so that MATLAB understands how to handle the symbol in your MATLAB workspace.
To add to the properties of the class, bitfield objects inherit properties and methods from the numeric and memoryobj classes.
Object properties can include both properties that the object inherits from its superclass, if any, and some properties that are unique to the class itself. For this reason, many objects in Embedded IDE Link CC share common properties; as you use the objects you will become familiar with the common and special properties for each.
| Property Name | Property Type | Default Value | Description |
|---|---|---|---|
address | mxArray | [0 0] | Memory address of the symbol, in [Offset Page] format |
arrayorder | {col-major,row | row-major | Ordering of values when moving data from linear memory storage to N-D arrays in MATLAB |
binarypt | int | 0 | Location of the binary point for fractional data types |
bitsperstorageunit | double | 8 | Bits per addressable unit in the signal processor |
endianness | {little, big} | little | Specifies whether the data is stored as little endian or big endian data |
length | int | 0 | Number of bits in the bitfield |
link | MATLAB handle | None | Object handle that identifies the object |
name | string | None | Name of the embedded symbol in the symbol table |
numberofstorageunits | double | 1 | Number of memory units needed to represent the object |
offset | int | 0 | Starting point of the bitfield in relation to bit 0 |
postpad | int | 0 | Number of bits of padding added at the end of the memory buffer. Added bits are ignored in final numeric values |
prepad | int | 0 | Number of bits of padding added at the beginning of the memory buffer. Added bits are ignored in final numeric values |
represent | {signed, unsigned, float, fract, ufract} | signed | Reports the data type of the values |
size | mxArray | 1 | Size of the array created in MATLAB from the data received from memory |
storageunitspervalue | int | 32 | Addressable units (au) per value in memory. May be less than one when you use bit packing |
timeout | double | 10 seconds | Time out period for Embedded IDE Link CC methods |
wordsize | int | 32 | Number of bits in a word for the processor |
Like properties, methods for objects may come from the superclass or derive only from the class itself.
| Name | Overloaded? | Description |
|---|---|---|
| cast | Yes | Copy an object and change the data type for a value at the same time |
| convert | No | Change the data type for a value |
| copy | Yes | Copy an existing object by creating a new pointer to the object |
| display | Yes | Display the properties of the object |
| read | Yes | Return the contents of the memory location specified by the symbol |
| write | Yes | Write one or more values to the memory location |
| Numeric Objects — Their Methods and Properties | Enum Objects — Their Methods and Properties | |
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