Reading a peripheral data from status port

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Dear sir,

I am trying to read a nibble into the status port.

The gateway laptop am using support output only, ecp, epp and bidirectional modes. I set the port to bidirectional mode.

I am doing a simple status port read of reading a latched data on a 74LS374 latch. Control bits of 2 was sent to the control port bit 1 of the control port to be written to the latch enable of the 74LS374. The problem is that the visual basic 2005 program sometimes reads a correct value on the latch, reads the old value when a new value is present or hang with a value of 255 and refuse to change the value until the system is restarted. what should I do to correct this problem.

Thanks.

Olakunle

Posted 2-Mar-11 7:22am

Olafiranye

Updated 2-Mar-11 7:59am

Henry Minute

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Henry Minute 2-Mar-11 14:00pm

Unless someone else has encountered exactly the same problem as yourself it is going to be very difficult for anybody to give a meaningful answer, without seeing the section of your code where the error occurs.

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OriginalGriff · Answer 1 · 2011-03-02T08:19:00

Solution 1

I haven't played with the parallel port for a long while, but there is a complete article with source code here: Reading from Parallel Port using Inpout32.dll[^] which would probably be a good place to start.

Posted 2-Mar-11 8:19am

OriginalGriff