Figure 2.1 demonstrates typical calling sequences using the basic WinDriver WD_xxx() PCI/PCMCIA/ISA functions.

PCMCIA is supported only on Windows. Memory addresses can be accessed directly, using the user-mode mapping of the address returned by WD_CardRegister() [2.8] (or the kernel mapping, when accessing memory from the Kernel PlugIn). Direct memory access is more efficient than using WD_Transfer() [2.11]. It is possible (although not recommended) to replace the use of the high-level InterruptEnable() convenience function [2.18] with the low-level WD_IntEnable() [3.2], WD_IntWait() [3.3] and WD_IntCount() [3.4] functions, and replace the call to InterruptDisable() [2.19] with a call to the low-level WD_IntDisable() function [3.5]. For more information on the low-level WinDriver interrupt handling API, refer to Chapter 3 of the manual. WinDriver's general-use APIs, such as WD_DebugAdd() [5.6] or WD_Sleep() [5.8], can be called anywhere between the calls to WD_Open() and WD_Close(). For more details, refer to Chapter 5.

Figure 2.1. WinDriver PCI/PCMCIA/ISA Calling Sequence