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01.27.2004 at 09:17AM PST, ID: 20864441
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6.8

Using EPP Parallel Port Mode via VB6 either thru parport.sys or inpout32.dll

Asked by cosbit in Visual Basic Programming

Tags: ,

I've got custom hardware attached to the parallel port.  The firmware is being developed to Tx/Rx data using EPP.

I'm familiar with the protocol and have read "Parallel Port Complete" and beyondlogic.com, etc.

I currently am trying inpout32.dll (logix4u.cjb.net) under WinXP to write a byte to the device using EPP: Here's my code:

       'Initialize Control Register
        Call Out(Control, 4)
       
        'Make sure port is "ready"
        RxB = Inp(Status)
        If RxB And &H80 = &H80 Then Debug.Print "Port Ready"
       

        'Clear_EPP_Timeout
        Call Out(Status, 0)
        Call Out(Status, 1)
        RxB = Inp(Status)

    'Set to EPP Mode
    'Set the highest 3 bits to match the selected mode.
    ecpMode = 4
     ecrdata = (ecrdata And &H1F) + ecpMode * &H20
    'Write the result back to the ECR.
    Call Out(ECR, ecrdata)

        'Setup Port - Set to OUTPUT
        RxB = Inp(Control)
        RxB = RxB And &HDF
        Call Out(Control, RxB)

        'Send Byte
        Call Out(EPPAddress, &H88)    'Send byte to parport
        RxB = Inp(EPPAddress)
       
        'Check for timeout
        RxB = Inp(Status)
        RxB = RxB And 1
        If RxB = 1 Then Debug.Print "Timeout"


The problem is that After writing the byte to the EPPAddress register, "DataStrobe" (Pin14) never goes low.  As I understand it, the parport hardware should handle all the handshaking and should bring DataStrobe low to start the xfer.  The device on the port initializes by keeping "Wait" Pin 11 low.

As an alternative solution, how can I call the standard Windows device driver (parport.sys?) to send a byte over the parallel port via EPP under VB6.  I understand it requires some CreateFile() and DeviceIOCtl() calls but code would be helpful.

Thanks in advance!Start Free Trial
 
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[+][-]01.27.2004 at 01:54PM PST, ID: 10213599

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[+][-]01.27.2004 at 02:11PM PST, ID: 10213733

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[+][-]01.27.2004 at 03:06PM PST, ID: 10214113

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[+][-]01.27.2004 at 03:34PM PST, ID: 10214306

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[+][-]01.27.2004 at 03:54PM PST, ID: 10214497

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[+][-]01.28.2004 at 12:15AM PST, ID: 10216397

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About this solution

Zone: Visual Basic Programming
Tags: vb6, epp
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Solution Provided By: mop_se
Participating Experts: 1
Solution Grade: A
 
 
[+][-]01.30.2004 at 10:54AM PST, ID: 10237494

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[+][-]01.30.2004 at 04:21PM PST, ID: 10239910

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[+][-]01.31.2004 at 07:43PM PST, ID: 10245285

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