iic能否在应用程序中直接使用？

别以为你站在珠峰就能看到全世界 2013-02-21 01:39:41

平台:s3c6410
我参考摄像头里面的代码，在驱动里面调用iic，可以正常读写。
可是在应用程序里面直接调用同样的代码，createfile没有问题，但是读写都不行。
DeviceIoControl返回TURE，但是读到字节数都为0.
难道iic驱动只能被其他驱动调用，而不能被应用程序调用吗？

...全文

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别以为你站在珠峰就能看到全世界 2013-02-25

to glchild514:你的代码中读有错误。 memcpy(&IoDescOut, pBufIn, sizeof(IIC_IO_DESC)); 这里必须使用pBufOut。应用程序要调用iic 1.去掉下面代码 if (GetDirectCallerProcessId() != GetCurrentProcessId()){ return ERROR_ACCESS_DENIED; } 2.根据驱动的情况，看是否需要蒋CeOpenCallerBuffer等接口改为异步方式的接口CeAllocAsynchronousBuffer。

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glchild514 2013-02-22

恩那我不知道了

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别以为你站在珠峰就能看到全世界 2013-02-22

to glchild514：我测试你的代码，读的时候没有异常，但是没有数据（驱动都读不到），也并没有超时。下面是我的读代码。


RETAILMSG(SHOW_FUNCTION_MSG, (TEXT("IIC_IOControl: IOCTL_IIC_READ.\r\n")));
        if ( (dwLenIn < sizeof(IIC_IO_DESC)) || (NULL == pBufIn) || (dwLenOut < sizeof(IIC_IO_DESC)) || (NULL == pBufOut) ) {
            SetLastError (ERROR_INVALID_PARAMETER);
            RetVal = FALSE;
            DEBUGMSG (ZONE_ERROR, (TEXT(" Invalid parameter\r\n")));
            break;
        }            

		if(FAILED(CeOpenCallerBuffer(&pMarshalledInBuf, pBufIn, dwLenIn, ARG_I_PTR, TRUE)))
		{
			RETAILMSG(1, (TEXT("IIC_IOControl: CeOpenCallerBuffer failed in IOCTL_IIC_READ for IN buf.\r\n")));
			return FALSE;
		}
		if(FAILED(CeOpenCallerBuffer(&pMarshalledOutBuf, pBufOut, dwLenOut, ARG_O_PTR, TRUE)))
		{
			RETAILMSG(1, (TEXT("IIC_IOControl: CeOpenCallerBuffer failed in IOCTL_IIC_READ for OUT buf.\r\n")));
			return FALSE;
		}

		EnterCriticalSection(&(pInitContext->CritSec));    
		if(HW_Read(pOpenContext, (PIIC_IO_DESC)pMarshalledInBuf, (PIIC_IO_DESC)pMarshalledOutBuf))
		{
			// success
			*pdwActualOut = sizeof(IIC_IO_DESC);                        
		}
		else
		{
			RETAILMSG(1, (TEXT("IIC_IOControl: IOCTL_IIC_READ ERROR_TIMEOUT.\r\n")));
			SetLastError(ERROR_TIMEOUT);
			*pdwActualOut = 0;
			RetVal = FALSE;            
		}			  
		LeaveCriticalSection(&(pInitContext->CritSec));

		if(FAILED(CeCloseCallerBuffer(pMarshalledInBuf, pBufIn, dwLenIn, ARG_I_PTR)))
		{		  
			RETAILMSG(1, (TEXT("IIC_IOControl: CeCloseCallerBuffer failed in IOCTL_IIC_READ for IN buf.\r\n")));
			return FALSE;
		}
		if(FAILED(CeCloseCallerBuffer(pMarshalledOutBuf, pBufOut, dwLenOut, ARG_O_PTR)))
		{
			RETAILMSG(1, (TEXT("IIC_IOControl: CeCloseCallerBuffer failed in IOCTL_IIC_READ for OUT buf.\r\n")));
			return FALSE;
		}

其实看起来大同小异。

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别以为你站在珠峰就能看到全世界 2013-02-22

发现原来是 if (GetDirectCallerProcessId() != GetCurrentProcessId()){ return ERROR_ACCESS_DENIED; } 引起的，难怪没有错，但是app读不到内容。不过去掉后发现还是有点问题，读多几次会出现data abort。

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别以为你站在珠峰就能看到全世界 2013-02-21

引用 7 楼 yybing 的回复:

你确信你的代码读写的时候没有错误？我的做法和你的一样，读写的时候就会出错，我在驱动里看到的是读写前要做I2C初始化的过程了不过我还没试过怎么搞，只想找一下示例代码

上面的代码其实我只是做测试用，本来就放在触摸屏里面，触摸效果很好，没有出过错。你出错或者是iic驱动的问题。我怀疑我的问题是不是也是驱动还有BUG。bsp自带的代码读写是会报错的，我自己改了一下。 to glchild514：谢谢。晚点我比较一下代码看看跟你的有什么区别。

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yybing 2013-02-21

你确信你的代码读写的时候没有错误？我的做法和你的一样，读写的时候就会出错，我在驱动里看到的是读写前要做I2C初始化的过程了不过我还没试过怎么搞，只想找一下示例代码

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glchild514 2013-02-21

case IOCTL_IIC_GET_CLOCK: if ( (dwLenOut < sizeof(UINT32)) || (NULL == pBufOut) || (NULL == pdwActualOut) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { *(UINT32*)pBufOut = pOpenContext->PDDContextVal.Clock; // Return the size *pdwActualOut = sizeof(UINT32); } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_GET_CLOCK] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_SET_MODE: if ( (dwLenIn < sizeof(UINT32)) || (NULL == pBufIn) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { pOpenContext->PDDContextVal.ModeSel = (IIC_MODE)*(UINT32*)pBufIn; pOpenContext->DirtyBit = TRUE; } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_SET_MODE] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_GET_MODE: if ( (dwLenOut < sizeof(UINT32)) || (NULL == pBufOut) || (NULL == pdwActualOut) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { *(UINT32*)pBufOut = pOpenContext->PDDContextVal.ModeSel; // Return the size *pdwActualOut = sizeof(UINT32); } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_GET_MODE] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_SET_FILTER: if ( (dwLenIn < sizeof(UINT32)) || (NULL == pBufIn) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { pOpenContext->PDDContextVal.FilterEnable = (*(UINT32*)pBufIn) ? 1 : 0; // Filter Enable is a bit a non-zero input value will turn this bit on pOpenContext->DirtyBit = TRUE; } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_SET_FILTER] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_GET_FILTER: if ( (dwLenOut < sizeof(UINT32)) || (NULL == pBufOut) || (NULL == pdwActualOut) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { *(UINT32*)pBufOut = pOpenContext->PDDContextVal.FilterEnable; // Return the size *pdwActualOut = sizeof(UINT32); } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_GET_FILTER] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_SET_DELAY: if ( (dwLenIn < sizeof(UINT32)) || (NULL == pBufIn) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { pOpenContext->PDDContextVal.Delay = (IIC_DELAY)*(UINT32*)pBufIn; pOpenContext->DirtyBit = TRUE; } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_SET_DELAY] exception...\n")); RetVal = FALSE; } break; case IOCTL_IIC_GET_DELAY: if ( (dwLenOut < sizeof(UINT32)) || (NULL == pBufOut) || (NULL == pdwActualOut) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } __try { *(UINT32*)pBufOut = pOpenContext->PDDContextVal.Delay; // Return the size *pdwActualOut = sizeof(UINT32); } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_GET_FILTER] exception...\n")); RetVal = FALSE; } break; default: DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Unknown IOCTL code (%d)\r\n"), dwCode)); SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; } DEBUGMSG (ZONE_FUNCTION|(RetVal == FALSE?ZONE_ERROR:0), (TEXT("-IIC_IOControl %s Ecode=%d (len=%d)\r\n"), (RetVal == TRUE) ? TEXT("Success") : TEXT("Error"), GetLastError(), (NULL == pdwActualOut) ? 0 : *pdwActualOut)); return(RetVal); }

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glchild514 2013-02-21

driver改一下這樣行不行 BOOL IIC_IOControl(PHW_OPEN_INFO pOpenContext, DWORD dwCode, PBYTE pBufIn, DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut) { BOOL RetVal = TRUE; // Initialize to success PHW_INIT_INFO pInitContext; IIC_IO_DESC IoDescIn; IIC_IO_DESC IoDescOut; PVOID pUnMarshalledInBuf = NULL; PVOID pUnMarshalledOutBuf = NULL; //if caller is not kernel mode, do not allow setting power state if (GetDirectCallerProcessId() != GetCurrentProcessId()){ return ERROR_ACCESS_DENIED; } if (pOpenContext==NULL) { SetLastError (ERROR_INVALID_HANDLE); return(FALSE); } pInitContext = pOpenContext->pInitContext; if ( pInitContext == NULL ) { SetLastError (ERROR_INVALID_HANDLE); return(FALSE); } DEBUGMSG (ZONE_FUNCTION, (TEXT("+IIC_IOControl(0x%X, %d, 0x%X, %d, 0x%X, %d, 0x%X)\r\n"), pOpenContext, dwCode, pBufIn, dwLenIn, pBufOut, dwLenOut, pdwActualOut)); if ( !pInitContext->OpenCnt ) { DEBUGMSG (ZONE_ERROR, (TEXT(" IIC_IOControl - device was closed\r\n"))); SetLastError (ERROR_INVALID_HANDLE); return(FALSE); } switch ( dwCode ) { case IOCTL_POWER_CAPABILITIES: if ( !pdwActualOut || !pBufOut || (dwLenOut < sizeof(POWER_CAPABILITIES)) ) { RetVal = FALSE; SetLastError (ERROR_INVALID_PARAMETER); break; } __try { memcpy(pBufOut, &g_PowerCaps, sizeof(POWER_CAPABILITIES)); *pdwActualOut = sizeof(POWER_CAPABILITIES); } __except(EXCEPTION_EXECUTE_HANDLER) { RetVal = FALSE; SetLastError (ERROR_INVALID_PARAMETER); break; } break; case IOCTL_POWER_QUERY: break; case IOCTL_POWER_SET: break; case IOCTL_IIC_WRITE: if ( (dwLenIn < sizeof(IIC_IO_DESC)) || (NULL == pBufIn) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } EnterCriticalSection(&(pInitContext->CritSec)); __try { memcpy(&IoDescIn, pBufIn, sizeof(IIC_IO_DESC)); pUnMarshalledInBuf = IoDescIn.Data; if(FAILED(CeOpenCallerBuffer((PVOID *)&IoDescIn.Data, pUnMarshalledInBuf, IoDescIn.Count, ARG_I_PTR, FALSE))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeOpenCallerBuffer failed in IOCTL_IIC_WRITE for IN buf.\r\n"))); RetVal = FALSE; break; } if((HW_Write(pOpenContext, &IoDescIn)==NULL)) { SetLastError(ERROR_TIMEOUT); RetVal = FALSE; } if(FAILED(CeCloseCallerBuffer(IoDescIn.Data, pUnMarshalledInBuf, IoDescIn.Count, ARG_I_PTR))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeCloseCallerBuffer failed in IOCTL_IIC_WRITE for IN buf.\r\n"))); return FALSE; } } __except(EXCEPTION_EXECUTE_HANDLER) { RetVal = FALSE; SetLastError (ERROR_INVALID_PARAMETER); } LeaveCriticalSection(&(pInitContext->CritSec)); break; case IOCTL_IIC_READ: if ( (dwLenIn < sizeof(IIC_IO_DESC)) || (NULL == pBufIn) || (dwLenOut < sizeof(IIC_IO_DESC)) || (NULL == pBufOut) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } EnterCriticalSection(&(pInitContext->CritSec)); __try { memcpy(&IoDescIn, pBufIn, sizeof(IIC_IO_DESC)); pUnMarshalledInBuf = IoDescIn.Data; if(FAILED(CeOpenCallerBuffer((PVOID *)&IoDescIn.Data, pUnMarshalledInBuf, IoDescIn.Count, ARG_I_PTR, FALSE))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeOpenCallerBuffer failed in IOCTL_IIC_READ for IN buf.\r\n"))); RetVal = FALSE; break; } memcpy(&IoDescOut, pBufIn, sizeof(IIC_IO_DESC)); pUnMarshalledOutBuf = IoDescOut.Data; if(FAILED(CeOpenCallerBuffer((PVOID *)&IoDescOut.Data, pUnMarshalledOutBuf, IoDescOut.Count, ARG_O_PTR, FALSE))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeOpenCallerBuffer failed in IOCTL_IIC_READ for OUT buf.\r\n"))); RetVal = FALSE; break; } if(HW_Read(pOpenContext, &IoDescIn, &IoDescOut)) { // success *pdwActualOut = sizeof(IIC_IO_DESC); } else { SetLastError(ERROR_TIMEOUT); *pdwActualOut = 0; RetVal = FALSE; } if(FAILED(CeCloseCallerBuffer(IoDescIn.Data, pUnMarshalledInBuf, IoDescIn.Count, ARG_I_PTR))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeCloseCallerBuffer failed in IOCTL_IIC_READ for IN buf.\r\n"))); RetVal = FALSE; } if(FAILED(CeCloseCallerBuffer(IoDescOut.Data, pUnMarshalledOutBuf, IoDescOut.Count, ARG_O_PTR))) { RETAILMSG(1, (TEXT("IIC_IOControl: CeCloseCallerBuffer failed in IOCTL_IIC_READ for OUT buf.\r\n"))); RetVal = FALSE; } } __except(EXCEPTION_EXECUTE_HANDLER) { RetVal = FALSE; SetLastError (ERROR_INVALID_PARAMETER); } LeaveCriticalSection(&(pInitContext->CritSec)); break; case IOCTL_IIC_SET_CLOCK: if ( (dwLenIn < sizeof(UINT32)) || (NULL == pBufIn) ) { SetLastError (ERROR_INVALID_PARAMETER); RetVal = FALSE; DEBUGMSG (ZONE_ERROR, (TEXT("IIC_IOControl: Invalid parameter\r\n"))); break; } EnterCriticalSection(&(pInitContext->CritSec)); __try { pOpenContext->PDDContextVal.Clock = *(UINT32*)pBufIn; HW_SetClock(pOpenContext); pOpenContext->DirtyBit = TRUE; } __except(EXCEPTION_EXECUTE_HANDLER) { RETAILMSG(1, (L"[IOCTL_IIC_SET_CLOCK] exception...\n")); RetVal = FALSE; } LeaveCriticalSection(&(pInitContext->CritSec)); break;

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别以为你站在珠峰就能看到全世界 2013-02-21


#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <types.h>
#include "iic.h"

#define FT5X06_I2C_ADDR     0x70
#define I2C_DEVICE_BUS_0	_T("IIC0:")

static HANDLE g_hFT5X06 = NULL;

//-----------------------------------------------------------------------------
//  Function:  FT5X06_Initialize
//
//  Initialize PMIC
//
BOOL FT5X06_Initialize()
{
    // Open I2C handle
    g_hFT5X06 = CreateFile(I2C_DEVICE_BUS_0,
	                   GENERIC_READ|GENERIC_WRITE,
	                   FILE_SHARE_READ|FILE_SHARE_WRITE,
	                   NULL, OPEN_EXISTING, 0, 0);
                   
    if ( INVALID_HANDLE_VALUE == g_hFT5X06 ) 
	{
        DWORD dwErr = GetLastError();
        RETAILMSG(TRUE, (TEXT("Error %d opening device '%s' \r\n"), dwErr, I2C_DEVICE_BUS_0 ));
        return FALSE;
    }
    
    return TRUE;
}

//-----------------------------------------------------------------------------
//  Function:  FT5X06_Deinitialize
//
//  Denitialize PMIC
//
VOID FT5X06_Deinitialize()
{
    // Close I2C handle
    if(g_hFT5X06 != INVALID_HANDLE_VALUE)
        CloseHandle(g_hFT5X06);
}

//-----------------------------------------------------------------------------
//  Function:  FT5X06_Write
//
//  Write PMIC Registers
//
BOOL FT5X06_Write(UINT8 addr, UINT8 val)
{
    BOOL rc = TRUE;

    if (g_hFT5X06 == INVALID_HANDLE_VALUE)
    {
        DEBUGMSG(TRUE, (L"FT5X06_Write: Invalide handle\r\n"));
        rc = FALSE;
    }
    else
    {
        DWORD dwErr=0;
        DWORD bytes;
        IIC_IO_DESC IIC_Data;
        UINT8 Data[16] = {0};
            
        Data[0] = addr;
        Data[1] = val;
        
        IIC_Data.SlaveAddress = FT5X06_I2C_ADDR;
        IIC_Data.Count = 2;
        IIC_Data.Data = Data;
        
        // use iocontrol to write
        if ( !DeviceIoControl(g_hFT5X06,
                              IOCTL_IIC_WRITE, 
                              &IIC_Data, sizeof(IIC_IO_DESC), 
                              NULL, 0,
                              &bytes, NULL) ) 
        {
            dwErr = GetLastError();
            RETAILMSG(TRUE,(TEXT("IOCTL_IIC_WRITE ERROR: %u \r\n"), dwErr));
            rc = FALSE;
        }   
    }

    return rc;
}

//-----------------------------------------------------------------------------
//  Function:  FT5X06_Read
//
//  Read PMIC Registers
//
BOOL FT5X06_Read(UINT8 addr, UINT8 *val, UINT8 size)
{
    BOOL rc = TRUE;

    if (g_hFT5X06 == INVALID_HANDLE_VALUE)
    {
        DEBUGMSG(TRUE, (L"FT5X06_Read: Invalide handle.\r\n"));
        rc = FALSE;
    }
    else
    {
        DWORD dwErr=0;
        DWORD bytes;
        IIC_IO_DESC IIC_AddressData, IIC_Data;

        IIC_AddressData.SlaveAddress = FT5X06_I2C_ADDR;
        IIC_AddressData.Data = &addr;
        IIC_AddressData.Count = 1;

        IIC_Data.SlaveAddress = FT5X06_I2C_ADDR | 0x01;
        IIC_Data.Data = val;
        IIC_Data.Count = size;
        
        // use iocontrol to read    
        if ( !DeviceIoControl(g_hFT5X06,
                              IOCTL_IIC_READ, 
                              &IIC_AddressData, sizeof(IIC_IO_DESC), 
                              &IIC_Data, sizeof(IIC_IO_DESC),
                              &bytes, NULL) ) 
        {
            dwErr = GetLastError();
            RETAILMSG(TRUE,(TEXT("IOCTL_IIC_WRITE ERROR: %u \r\n"), dwErr));
            rc = FALSE;
        }  
    }

    return rc;
}

代码如上。我觉得驱动应该没有这种限制，所以很想怀疑是硬件问题，不过在驱动中他又能工作，那么也就证明硬件应该是通的。好晕，没想清楚。