(Engine-Level Function)
Deprecated. This function relies on the VTSIO driver, which is no longer included in new installations. Will continue to function in legacy installations but should not be used in new code.
| Description: | Read I/O Byte. This function returns the byte read from an I/O port. |
| Returns: | Byte |
Usage:  |
Script or steady state. |
| Function Groups: | Memory I/O, Stream and Socket |
| Related to: | InWord | Out | OutWord |
| Format: |
In(Port) |
| Parameters: |
| Port |
| Required. Any numeric expression, which specifies which I/O port to read. Port must be in the range 0 to 65535 |
| Comments: | This function requires that the VTSIO driver be installed. If In is used in a statement or an action trigger, it will be evaluated at a very fast rate. In is a high priority function, and should be used sparingly to avoid reducing overall system performance. |
Example:
reg = In(0x300);
This reads a byte from CPU input port 300 hex. If this statement appears in a script the read takes place when the script is executed. If this statement appears in steady state, it is updated very rapidly as a high-priority function.
