There are certain use cases – we may have to handle the non-standard custom interface to communicate between the processor and the hardware. An example is controlling the brightness of an LCD. The brightness controller is interfaced with the processor in a single GPIO pin. Communication will happen by just toggling the GPIO at a constant rate through software driver.
Since Windows CE is a multi-threading OS, task switching will happen between multiple threads. This task switching may prevent your driver to maintain the constant rate of GPIO toggling. This leads to malfunction. See more details on the following link...
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