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I really like Microsoft s Visual Basic 6.0 as a quick and dirty Microsoft Windows application-development tool. I nd that I can create Visual Basic applications very quickly and can update them as the application gets more complex. It is also an excellent tool for experimenting (although my experiments usually turn into applications). If you are willing to prowl around and look through what kind of extra controls are available, you will nd that there is the MSComm serial communications control. This control allows you direct access to the serial ports within the PC and allows you to interface directly with the serial port hardware without having to load in device drivers. The MSComm control itself is very easy to use; the biggest problem that you will have is trying to gure out how to enable it. When you rst load up Visual Basic, you are given a basic number of controls in the Toolbox down the left hand side of the development screen. These controls, as I pointed out earlier in this chapter, are a basic number needed to execute most initial (beginner s) Visual Basic applications. The basic controls can be expanded with not only the MSComm serial port controls but also with Microsoft le objects, ActiveX, and OLE controls, Kodak Image, Macrovision Shockwave controls along with a lot of other controls and objects that you can use in your application.
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For adding the MSComm serial port control to the available selection, you can click on Project, followed by Component and then Apply Microsoft Comm Control. With the control added to the toolbox, you can now use MSComm with your applications. The YAP programmer is a fairly complex programmer that was designed to interface only with PC and workstation serial ports to program PIC microcontrollers. When I originally designed the YAP, I designed it for use with a generic terminal emulator. By using MSComm, I was able to come up with a reasonably attractive Windows front end that runs quickly and easily for the application. To work with the MSComm control, after loading the control onto the toolbox, I place MSComm s Telephone icon on the dialog box, similarly as I would with the timer. When the application is executing, the Telephone is invisible to the user. To initialize the MSComm control, I used the recommended sequence that consists of
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Specify the hardware serial port to be used. Set the speed and data format to be used. De ne the buffer size. Open the port and begin to use it.
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The code used to perform these functions is placed in the Form_Load subroutine, which means that the port is enabled before the primary dialog box is executing.
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Private Sub Form_Load() On Form Load, Setup Serial Port 3 for YAP Programmer MSComm3.CommPort = 3 MSComm3.Settings = 1200,N,8,1 MSComm3.InputLen = 0 MSComm3.PortOpen = True Text1.Text = Turn on YAP Programmer End Sub
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With the port initialized and executing, I use a 50-ms timer to continually poll the serial port and display data in the Text box when it is received:
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Private Sub Timer1_Timer() Interrupt every 50 msecs and Read in the Buffer Dim InputString InputString MSComm3.Input
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If (InputString <> ) Then
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If (Text1.Text = Turn on YAP Programmer ) Then Text1.Text = Clear the Display Buffer End If Text1.Text = Text1.Text + InputString End If End Sub
This application code rst prompts the user to turn on the programmer, and if it is done when data is received, the Text display is cleared, and data is placed in sequence on the display. For specialized operations (such as selecting Flash versus EPROM control store types), I use CommandButton controls, which send data to the YAP via the serial port using the code
Private Sub Command1_Click() Put the Programmer into Flash Mode Text1.Text = MSComm3.Output = f + Chr$(13) End Sub
With these controls, the YAP can be controlled using the buttons and the mouse with the dialog much more quickly and ef ciently (i.e., little chance for error) than if the commands were entered manually by the user. One nice feature of this application is the text box that is continually updated by the timer interrupt routine, showing what is actually happening with the YAP and allowing the user to debug problems very quickly. Further enhancing the usefulness of the MSComm control is the OnComm event. This feature is similar to an interrupt because it is requested after speci ed events in the serial port. The CommEvent property contains the reason code for the event. These codes are listed in Table 19.3. These values can be processed in the OnComm event handler like this:
Private Sub Object_OnComm() Handle Serial Port Events Select Case Object.CommEvent Case comEventBreak Handle a Break Received Beep : Handle other events End Select End Sub
To identify the serial port object, I have italicized the word Object in the OnComm event handler to make the label used for the serial port more noticeable.
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