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Pin 9 is the most significant bit of the parallel data byte. A short length of wire inserted into the appropriate holes in the parallel portĬonnector on the back of your system creates this connection. (short of hooking up a printer to the port) is to connect pins 9 and 10 of the parallelĬonnector.
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The simplest way to force the interface to generate interrupts Generates an interrupt whenever the electrical signal at pin 10 (the so-called ACK bit)Ĭhanges from low to high. Once interrupts are enabled, the parallel interface Outb call to set the bit is performed by short Of port 2 ( 0x37a, 0x27a, or whatever) enables interrupt reporting. Interrupts before it’s instructed to do so the parallel standard states that setting bit 4 Like most devices, the parallel port doesn’t actually generate Used by the printer to notify the lp driver that it is ready to accept Understanding of concurrency control techniques is vital when working with interrupts.Īlthough the parallel interface is simple, it can trigger interrupts. But we also recommend that you turn back and have another look now. Temptation to pass over the discussion in Chapter 5, Issues of concurrency and contention for data structures and hardware. Handlers, by their nature, run concurrently with other code. It?), to remind us that it handles interrupts.īefore we get into the topic, however, it is time for one cautionary note. Short, actually means short int (it is C, isn’t Short module from the previous chapter with some small additions itĬan generate and handle interrupts from the parallel port. Ports are starting to become scarce on modern hardware, but, with luck, most people are stillĪble to get their hands on a system with an available port.
What does thread stuck in device driver mean code#
Thus, the sample code used in this chapter works with the parallel port. It is difficult to demonstrate the use of interrupts without a real hardware device to Interrupt handlers are somewhat limited in the actions they can perform as a result of how Of course, underneath that simple picture there is some complexity in particular, Only register a handler for its device’s interrupts, and handle them properly when theyĪrrive. In much the same way that it handles signals in user space. That the hardware can send when it wants the processor’s attention. Since it is almost always undesirable to have the processor wait on externalĮvents, there must be a way for a device to let the processor know when something has Much has to be done in a time frame that is different from, and far slower than, that Which often includes things such as spinning disks, moving tape, wires to distant places, and Devices have to deal with the external world,
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The only thing that has worked has been the workaround mentioned in the first post.which is not ideal.Although some devices can be controlled using nothing but their I/O regions, most realĭevices are a bit more complicated than that. Every release so far has frozen at driver install. I can confirm that this did not solve my problem of freezing at Driver Install. Q: How many machines have you tested this with?Ī: This has worked on 7 different machines at the moment. (Note: On step 5 you will drag the slider to the 2nd notch thus putting it back at default.) Simply repeat steps 1-8 to turn UAC back on. Drag slider to the bottom to turn off UAC.Ī: Just turns off UAC to avoid permission issues while installing CUE.Ī: You sure can.Click Change User Account Control Settings.This is a simple fix which seems to work on multiple systems. I have noticed quite a few people are having this issue.