Winford Engineering www.winfordeng.com ********** GENERAL INFORMATION ********** This simple program demonstrates how to access the CRD155B card using Winford Engineering's Portal API. ********** PROGRAM FUNCTION ********** This is a simple counter program. A bit of the input port acts as the clock (Port 2, bit 0). We assume that a bounceless pushbutton or some low-frequency clock source is connected to this bit of the input port. The program counts the number of times the pushbutton is pressed and outputs the count to the screen as well as to the output port (Port 1). While this is a simplistic program, it provides a framework to guide the programmer in using the Portal API. ********** HARDWARE SETUP ********** This program assumes that your CRD155B card is set for base address 384 decimal. It automatically configures Port 1 as an OUTPUT port and Port 2 as an INPUT port. Port 3 will not be used, but it will also be configured as an INPUT port. To prevent data conflicts, be sure that Port 1 is not connected to the outputs of any devices, as this port will become an output port when this program runs. You can connect 8 LEDs to Port 1 to view the current count, or you can just watch it on the screen. To increment the count, you will need to either connect a pushbutton with a pull-up resistor or a low frequency clock source to Port 2, Bit 0. ********** DRIVER AND LIBRARY REQUIRED ********* This program requires that the Portal driver and library be installed on the system. Please see the installation instructions in the Portal documentation. For the Visual Basic 5 executable, you must also have the Visual Basic 5 runtime (MSVBVM50.dll) on your system. This can be downloaded from Winford Engineering's web site if you do not have it on your system. For the Visual Basic .NET executable, you will need the .NET Framework installed on your computer. This can be downloaded from Microsoft's web site if you do not have it on your system.Download Driver Pack
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