wince +6410 IIC 驅動問題

                                                      
wince +6410 IIC 驅動問題

最近調試6410的IIC驅動，要求上層將資料寫入eeprom永久儲存，開始由於bsp包裡的camera驅動裡，有操作IIC的樣本，自然就參考camera驅動裡依葫蘆畫瓢就行了，

// Initialize IIC1
 hI2C = CreateFile(_T("IIC0:"), GENERIC_READ|GENERIC_WRITE,
                   FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0);
 if(INVALID_HANDLE_VALUE == hI2C)
 {
  MessageBox(L"無法開啟I2C");
  dwErr = GetLastError();
  return FALSE;
 }
 if (!DeviceIoControl(hI2C,
  IOCTL_IIC_SET_CLOCK,
  &IICClock, sizeof(UINT32),
  NULL, 0,
  &bytes, NULL) )
 {
  dwErr = GetLastError();
  MessageBox(L"無法設定I2C clock");
  return FALSE;
 }      
 uiIICDelay = 0;
 if ( !DeviceIoControl(hI2C,
  IOCTL_IIC_SET_DELAY,
  &uiIICDelay, sizeof(UINT32),
  NULL, 0,
  &bytes, NULL) )
 {
  dwErr = GetLastError();
  MessageBox(L"無法設定I2C delay");
  
  return FALSE;
 }

 

開啟iic 沒有問題，設定時鐘 和延時時間就出問題了，iic壓根就沒反應，後開啟調試資訊，發現進入IIC_IOControl 後，到

if (GetDirectCallerProcessId() != GetCurrentProcessId()){
       RETAILMSG(1, (TEXT(" mao IIC_IOControl  1: \r\n"))); //add mao
       return ERROR_ACCESS_DENIED;
    }

就沒往下走了，

後來網上查資料才知道本身驅動不支援應用程式調用，是給其他驅動程式調用的。因為在IIC_IOControl前面添加了個判斷

   if (GetDirectCallerProcessId() != GetCurrentProcessId()){
       RETAILMSG(1, (TEXT(" mao IIC_IOControl  1: \r\n"))); //add mao
       return ERROR_ACCESS_DENIED;
    }

應用程式調用時需要將上面的判斷注釋掉，注釋掉後，可以讀寫了，可有好幾次 連續讀資料時就報錯，

Exception 'Data Abort' (4): Thread-Id=01970006(pth=8617c2ec), Proc-Id=00400002(pprc=82ab9308) 'NK.EXE', VM-active=058b0006(pprc=84954618) 'explorer.exe'
PC=c0e32b98(s3c6410_iic.dll+0x00002b98) RA=c0e32b10(s3c6410_iic.dll+0x00002b10) SP=d285fe64, BVA=001aeee8

一直納悶，查原始碼沒找出根本原因，無意中看到一文章，說可能是IIC_IO_DESC這個參數裡麵包括指標，需要進行指標的映射，如下：

BOOL        HW_Read             (PHW_OPEN_INFO pOpenContext, PIIC_IO_DESC pInData ,PIIC_IO_DESC pOutData)
{
  HRESULT   hr; //add mao for iic
    BOOL    retVal           = TRUE;        // Initialize to success
 PBYTE     MappedEmbedded;
 PBYTE     Marshalled;
    DEBUGMSG (ZONE_FUNCTION,
              (TEXT("+HW_Read(0x%X)\r\n"),
               pOpenContext));

    HW_SetRegister(pOpenContext);
    HW_Write(pOpenContext, pInData);
    ResetEvent(g_hTransferDone);
    //    Wait until IIC bus is free.
    if(!WaitForReg((PVOID)&(g_pIICReg->IICSTAT), (1<<5), 0x0, TIMEOUT_MS_RX))
    {
        DEBUGMSG(ZONE_ERROR,(TEXT("[IIC ERROR]IIS BUS is busy.\r\n")));
        retVal = FALSE;
        goto CleanUp;
    }

 //  核心地址映射
 hr = CeOpenCallerBuffer((PVOID*) &MappedEmbedded, pOutData->Data, pOutData->Count, ARG_O_PTR, FALSE);
 hr = CeAllocAsynchronousBuffer((PVOID*) &Marshalled, MappedEmbedded, pOutData->Count, ARG_O_PTR);

    g_pcIIC_BUFFER    =  Marshalled;//pOutData->Data;
    g_uIIC_PT        =    0;
    g_uIIC_DATALEN    =    pOutData->Count;

    g_pIICReg->IICCON |= (1<<7);        //    Ack generation Enable

    g_pIICReg->IICDS = pInData->SlaveAddress;

    g_pIICReg->IICSTAT = MRX_START;
 // RETAILMSG(1,(TEXT("mao g_pIICReg->IICDS Slave Address is 0x%02X\n"),pInData->SlaveAddress)); //add mao

    if(WaitForSingleObject(g_hTransferDone, TIMEOUT_MS_RX) == WAIT_TIMEOUT)
    {
        DEBUGMSG(ZONE_ERROR,(TEXT("[IIC ERROR]RX Time out.\r\n")));
        retVal = FALSE;
    }
 //  核心地址釋放
 hr = CeFreeAsynchronousBuffer((PVOID)Marshalled, MappedEmbedded, pOutData->Count, ARG_O_PTR);
 hr = CeCloseCallerBuffer((PVOID)  MappedEmbedded, pOutData->Data, pOutData->Count, ARG_O_PTR);

CleanUp:
    DEBUGMSG (ZONE_FUNCTION,
              (TEXT("+HW_Read(0x%X)\r\n"),
               pOpenContext));
    return retVal;
}

 

BOOL        HW_Write        (PHW_OPEN_INFO pOpenContext, PIIC_IO_DESC pInData)
{
    BOOL    retVal           = TRUE;        // Initialize to success
  PBYTE     MappedEmbedded;
  PBYTE     Marshalled;
  HRESULT   hr; //add mao for iic

    DEBUGMSG (ZONE_FUNCTION,
              (TEXT("+HW_Write(0x%X)\r\n"),
               pOpenContext));

    HW_SetRegister(pOpenContext);

    ResetEvent(g_hTransferDone);
    //    Wait until IIC bus is free.
    if(!WaitForReg((PVOID)&(g_pIICReg->IICSTAT), (1<<5), 0x0, TIMEOUT_MS_TX))
    {
        DEBUGMSG(ZONE_ERROR,(TEXT("[IIC ERROR]IIC BUS is busy.\r\n")));
        return FALSE;
    }
   // add mao
 hr = CeOpenCallerBuffer((PVOID*) &MappedEmbedded, pInData->Data, pInData->Count, ARG_I_PTR, FALSE);
 hr = CeAllocAsynchronousBuffer((PVOID*) &Marshalled, MappedEmbedded, pInData->Count, ARG_I_PTR);
    g_pcIIC_BUFFER    =    Marshalled;;//pInData->Data;
    g_uIIC_PT        =    0;
    g_uIIC_DATALEN    =    pInData->Count;

    g_pIICReg->IICCON |= (1<<7);        //    Ack generation Enable

    g_pIICReg->IICDS = pInData->SlaveAddress;
   // RETAILMSG(1,(TEXT("mao [IIC TX]Slave Address is 0x%02X\n"),pInData->SlaveAddress)); //add mao
    DEBUGMSG(ZONE_INFO,(TEXT("[IIC TX]Slave Address is 0x%02X\n"),pInData->SlaveAddress));

    g_pIICReg->IICSTAT = MTX_START;
 
    if(WaitForSingleObject(g_hTransferDone, 500) == WAIT_TIMEOUT)
    {
        DEBUGMSG(ZONE_ERROR,(TEXT("[IIC ERROR]TX Time out.\r\n")));
        retVal = FALSE;
    }
 hr = CeFreeAsynchronousBuffer((PVOID)Marshalled, MappedEmbedded, pInData->Count, ARG_I_PTR);
 hr = CeCloseCallerBuffer((PVOID)  MappedEmbedded, pInData->Data, pInData->Count, ARG_I_PTR);

    DEBUGMSG (ZONE_FUNCTION,
              (TEXT("-HW_Write(0x%X)\r\n"),
               pOpenContext));
    return retVal;
}

重新編譯後，讀寫正常了。

 

 

 

 

 

 

 

 

 

參考文章：http://bbs.csdn.net/topics/310115283

http://blog.csdn.net/knock/article/details/4770325

http://jazka.blog.51cto.com/809003/702584

http://blog.csdn.net/fgwntg/article/details/6798420