bt8xxaccess.cpp

bt848,bt878 a采集卡的探测

// This class represents our way to access the Hardware registers of the Bt8xx

#include "Bt8xxAccess.hpp"

// Bt8xx IDs
#define PCI_VENDOR_ID_BROOKTREE 0x109e 
#define PCI_DEVICE_ID_BT848     0x350	
#define PCI_DEVICE_ID_BT849     0x351
#define PCI_DEVICE_ID_BT878     0x36e
#define PCI_DEVICE_ID_BT879     0x36f

CBt8xxAccess::CBt8xxAccess() : dwPhysicalAddress(0) , dwMemoryBase(0)
{
	// Try to load Dscaler driver
	if (!DLL.Open(TEXT("DSDrv.dll"))) {
		return;
	}

	// Get pointers to all the required fns.
	static LPTSTR dTVFn[]={
		TEXT("isDriverOpened"),
		TEXT("pciGetHardwareResources"),
		TEXT("memoryAlloc"),
		TEXT("memoryFree"),
		TEXT("memoryMap"),
		TEXT("memoryUnmap"),
		TEXT("memoryReadBYTE"),
		TEXT("memoryReadWORD"),
		TEXT("memoryReadDWORD"),
		TEXT("memoryWriteBYTE"),
		TEXT("memoryWriteWORD"),
		TEXT("memoryWriteDWORD")
	};

	// dTV driver is loaded -- obtain entry points.
	FARPROC *ppEntries = (FARPROC *)&dTVDrv;
	for(int i=0; i<(sizeof dTVFn / sizeof dTVFn[0]); i++) {
		if (!(ppEntries[i] = DLL.GetProcAddress(dTVFn[i]))) {
			// Any failure will mean to abort here.
			return;
		}
	}

	// Map the registers...
	DWORD ids[4][2]={
		{ PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848 },
		{ PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849 },
		{ PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878 },
		{ PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879 },
	};

	// Try each device in turn...
	for(i=0; i<4; i++) {

		// Try to find the card...
		int ret = dTVDrv.pciGetHardwareResources(ids[i][0], ids[i][1], &dwPhysicalAddress,
			&dwMemoryLength, &dwSubsystem);

		if (ret == ERROR_SUCCESS) {

			// Get the Memory base... And try to map it
			dwMemoryBase = dTVDrv.memoryMap(dwPhysicalAddress, dwMemoryLength);

			// If we were able to do so, break loop!
			if (dwMemoryBase) {

				// Remember the Chip version...
				dwChip = ids[i][1];
				dwRevision = 0; // Can't use dTV to get it...

				break;
			}
		}
	}
	
}

CBt8xxAccess::~CBt8xxAccess() 
{
	// Only uninit if we can/must...
	if (DLL.IsOpen() && dTVDrv.memoryUnmap && dwPhysicalAddress) {
		dTVDrv.memoryUnmap(dwPhysicalAddress,dwMemoryLength);
		dwPhysicalAddress = NULL;
	}
}