Manual of Mineralogy, Including Observations of Mines, Rocks, Reduction of Ores, and the Applications of the Science to the Arts ...

That way you'll know how the device works (and that it is indeed working) when you start looking for the source of your interrupt problems. And there will almost certainly be some of those. 7.3 A Simple Timer Driver The device driver example that we're about to discuss is designed to control one of the timer/counter units contained within the 80188EB processor. I have chosen to implement this driver — and all of the remaining examples in the book — in C++. Although C++ offers no additional assistance over C in accessing hardware registers, there are many good reasons to use it for this type of abstraction. Most notably, C++ classes allow us to hide the actual hardware interface more completely than any C features or programming techniques. For example, a constructor can be included to automatically configure the hardware each time a new timer object is declared. This eliminates the need for an explicit call from the application software to the driver initialization routine. In addition, it is possible to hide the data structure that corresponds to the device registers within the private part of the associated class ...»