io.cpp

来自「用于开发Atmel的AVR系列单片机的GCC集成开发环境」· C++ 代码 · 共 47 行

#include "io.h"

PORTOUT PortOut;
PORTWORDOUT PortWordOut;
PORTDWORDOUT PortDWordOut;
PORTIN PortIn;
PORTWORDIN PortWordIn;
PORTDWORDIN PortDWordIn;
SETPORTBIT SetPortBit;
CLRPORTBIT ClrPortBit;
NOTPORTBIT NotPortBit;
GETPORTBIT GetPortBit;
RIGHTPORTSHIFT RightPortShift;
LEFTPORTSHIFT LeftPortShift;
ISDRIVERINSTALLED IsDriverInstalled;

HMODULE hio = NULL;

void UnloadIODLL() {
	FreeLibrary(hio);
}

int LoadIODLL()
{
        if (hio != NULL) return 0;
	hio = LoadLibrary("io.dll");
	if (hio == NULL) return 1;

	PortOut = (PORTOUT)GetProcAddress(hio, "PortOut");
	PortWordOut = (PORTWORDOUT)GetProcAddress(hio, "PortWordOut");
	PortDWordOut = (PORTDWORDOUT)GetProcAddress(hio, "PortDWordOut");
	PortIn = (PORTIN)GetProcAddress(hio, "PortIn");
	PortWordIn = (PORTWORDIN)GetProcAddress(hio, "PortWordIn");
	PortDWordIn = (PORTDWORDIN)GetProcAddress(hio, "PortDWordIn");
	SetPortBit = (SETPORTBIT)GetProcAddress(hio, "SetPortBit");
	ClrPortBit = (CLRPORTBIT)GetProcAddress(hio, "ClrPortBit");
	NotPortBit = (NOTPORTBIT)GetProcAddress(hio, "NotPortBit");
	GetPortBit = (GETPORTBIT)GetProcAddress(hio, "GetPortBit");
	RightPortShift = (RIGHTPORTSHIFT)GetProcAddress(hio, "RightPortShift");
	LeftPortShift = (LEFTPORTSHIFT)GetProcAddress(hio, "LeftPortShift");
	IsDriverInstalled = (ISDRIVERINSTALLED)GetProcAddress(hio, "IsDriverInstalled");

	atexit(UnloadIODLL);

	return 0;
}