dac.cpp

2410/wince下应用程序例程brick,COMMApp,DAC,DCMotor,mediaplayer,spi,stepmotor,tictac

#include "windows.h"
#include "s2410.h"
#include "winbase.h"


#define EXIO_BASE   			0xA2000000			//扩展IO物理地址
#define DAC_IOCTRL_WRITEDA		0x01				//写MAX504	

typedef void (* INIT)(void);
typedef BOOL  (* SEND)(unsigned char);
INIT SpiInit;
SEND SpiSend;
HINSTANCE hmode;


typedef struct{									
	
	unsigned int a;
	
}EXIO_TEST;
EXIO_TEST *exio=NULL;



bool   
DllEntry(HANDLE hinstdll, 
              DWORD dwreason, 
              LPVOID  lpvreserved )
{
	
    return true;
}


//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
bool DAC_Close(DWORD hopencontext)
{
    bool bret = true;
    
    return bret;
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
bool DAC_Deinit(DWORD hdevicecontext)
{
    bool bret = true;
    
    return bret;
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_Init(DWORD dwcontext)
{
	hmode=LoadLibrary(_T("spidrv.dll"));		//获取SPI动态链接库句柄
	
	RETAILMSG(1,(TEXT("DAC.DLL: init  !!!\r\n")));
		
	if(hmode)
	{
		
		SpiInit=(INIT)GetProcAddress(hmode,_T("SPI_Init"));			//获取函数地址
		SpiSend=(SEND)GetProcAddress(hmode,_T("SPI_SendByte"));
	}
	else
		RETAILMSG(1,(TEXT("LoadLibrary failed!!!\r\n")));
	SpiInit();														//初始化SPI总线
	
	
	///////////////////////映射扩展IO地址///////////////////
	exio=(EXIO_TEST *)VirtualAlloc(0,sizeof(EXIO_TEST),MEM_RESERVE, PAGE_NOACCESS);
	if(!exio)
	{
		RETAILMSG(1,(TEXT("DACdriver:exio virualalloc failed\r\n")));
		return 0;
		
	}
	if(!VirtualCopy((PVOID)exio,(PVOID)(EXIO_BASE),sizeof(EXIO_TEST),PAGE_READWRITE | PAGE_NOCACHE ))
	{
		RETAILMSG(1,(TEXT("DACdriver:virtualcopy failed! \r\n")));
		return 0;
	}
	
	
	exio=(EXIO_TEST *)((unsigned char *)exio+0x100);
	
	exio->a &= 0xFFFFFFF0;						//EXIO低4位清零
	exio->a |= 0x00000007;						//选中MAX504芯片
	
	//hmode =GetModuleHandle(_T("spidrv.dll"));

		
	
	
    return 1;
    
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_IOControl(
    DWORD Handle,
    DWORD dwIoControlCode,
    PBYTE pInBuf,
    DWORD nInBufSize,
    PBYTE pOutBuf,
    DWORD nOutBufSize,
    PDWORD pBytesReturned
    )
{
	unsigned int value=0;
    switch(dwIoControlCode)
    {
		case DAC_IOCTRL_WRITEDA:
				exio->a &= 0xFFFFFFF0;						//EXIO低4位清零
				exio->a |= 0x00000007;						//选中MAX504芯片
				
				value=(*((unsigned int *)pInBuf));
				
				value <<= 2;						//电压值左移两位
				
				SpiSend((value>>8)&0xff);			//传送电压值高8位
				
				SpiSend(value&0xff);				//传送电压值低8位
				
				exio->a |= 0x0000000f;				//拉高片选，锁存电压值
				
			  break;
		
				
		default :
		      return 0;
    }
    return 1;
}

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_Open(DWORD hdevicecontext, DWORD accesscode, DWORD sharemode)
{
    DWORD dwret = 0;
    

    dwret = 1; // have to make non-zero for this call to succeed.
    return dwret;
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void DAC_Powerdown(DWORD hdevicecontext)
{
    
} 

//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
void DAC_Powerup(DWORD hdevicecontext)
{
    
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_Read(DWORD hopencontext,LPVOID pbuffer, DWORD count)
{
    DWORD dwret = 0;
    
    return dwret;
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_Seek(DWORD hopencontext, long amount, DWORD type)
{
    DWORD dwret = 0;
    
    return dwret;
} 

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
DWORD DAC_Write(DWORD hopencontext, LPVOID psourcebytes, DWORD numberofbytes)
{
    DWORD dwret = 0;
    

    return dwret;
}