i2cbus.h

Microsoft WinCE 6.0 BSP FINAL release source code for use with the i.MX27ADS TO2 WCE600_FINAL_MX27_S

//      wClkRate
//          [out]   Contains the divisor index. Refer to I2C specification to
//          obtain the true clock frequency.
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_GET_CLOCK_RATE(hDev, wClkRate) \
    (DeviceIoControl(hDev, I2C_IOCTL_GET_CLOCK_RATE, NULL, 0, (PBYTE) &wClkRate, sizeof(wClkRate), NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_SET_CLOCK_RATE
//
// This macro will initialize the I2C device with the given clock rate. Note
// that this macro does not expect to receive the absolute peripheral clock
// frequency. Rather, it will be expecting the clock rate divisor index stated
// in the I2C specification. If absolute clock frequency must be used, please
// use the macro I2C_MACRO_SET_FREQUENCY.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//      wClkRate
//          [in]    Contains the divisor index. Refer to I2C specification to
//          obtain the true clock frequency.
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_SET_CLOCK_RATE(hDev, wClkRate) \
    (DeviceIoControl(hDev, I2C_IOCTL_SET_CLOCK_RATE, (PBYTE) &wClkRate, sizeof(wClkRate), NULL, 0, NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_SET_FREQUENCY
//
// This macro will estimate the nearest clock rate acceptable for I2C device
// and initialize the I2C device to use the estimated clock rate divisor. If
// the estimated clock rate divisor index is required, please refer to the macro
// I2C_MACRO_GET_CLOCK_RATE to determine the estimated index.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//      dwFreq
//          [in]    The desired frequency.
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_SET_FREQUENCY(hDev, dwFreq) \
    (DeviceIoControl(hDev, I2C_IOCTL_SET_FREQUENCY, (PBYTE) &dwFreq, sizeof(dwFreq), NULL, 0, NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_SET_SELF_ADDR
//
// This macro will initialize the I2C device with the given address. The device
// will be expected to respond when any master within the I2C bus wish to
// proceed with any transfer. Note that this macro will have no effect if the
// I2C device is in Master mode.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//      bySelfAddr
//          [in]    The expected I2C device address. The valid range of address
//          is [0x00, 0x7F].
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_SET_SELF_ADDR(hDev, bySelfAddr) \
    (DeviceIoControl(hDev, I2C_IOCTL_SET_SELF_ADDR, (PBYTE) &bySelfAddr, sizeof(bySelfAddr), NULL, 0, NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_GET_SELF_ADDR
//
// This macro will retrieve the address of the I2C device. Note that this macro
// is only meaningful if it is currently in Slave mode.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//      bySelfAddr
//          [out]   The current I2C device address. The valid range of address
//          is [0x00, 0x7F].
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_GET_SELF_ADRR(hDev, bySelfAddr) \
    (DeviceIoControl(hDev, I2C_IOCTL_GET_SELF_ADRR, NULL, 0, (PBYTE) &bySelfAddr, sizeof(bySelfAddr), NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_TRANSFER
//
// This macro performs one or more I2C read or write operations.  pPackets contains
// a pointer to the first of an array of I2C packets to be processed by the I2C.
// All the required information for the I2C operations should be contained
// in the array elements of pPackets.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//      pI2CTransferBlock
//          [in]    I2C_TRANSFER_BLOCK structure type. 
//                  The fields of I2C_TRANSFER_BLOCK are described below:
//                  pI2CPackets[in]     Holds the pointer to the I2C Packets
//                                      to transfer.
//                  iNumPackets[in]     Number of packets in pI2CPackets array.
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_TRANSFER(hDev, pI2CTransferBlock) \
    (DeviceIoControl(hDev, I2C_IOCTL_TRANSFER, (PBYTE) pI2CTransferBlock, sizeof(I2C_TRANSFER_BLOCK), NULL, 0, NULL, NULL))

//-----------------------------------------------------------------------------
//
// Macro:   I2C_MACRO_RESET
//
// This macro perform a hardware reset. Note that the I2C driver will still
// maintain all the current information of the device, which includes all the
// initialized addresses.
//
// Parameters:
//      hDev
//          [in]    The I2C device handle retrieved from CreateFile().
//
// Returns:  
//      Return TRUE or FALSE. If the result is TRUE, the operation is
//      successful.
//
//-----------------------------------------------------------------------------
#define I2C_MACRO_RESET(hDev) \
    (DeviceIoControl(hDev, I2C_IOCTL_RESET, NULL, 0, NULL, 0, NULL, NULL))

//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------

// I2C Packet
typedef struct
{
    BYTE byAddr;       // I2C slave device address for this I2C operation
    BYTE byRW;         // Read = I2C_READ or Write = I2C_WRITE
    PBYTE pbyBuf;      // Message Buffer
    WORD wLen;         // Message Buffer Length
    LPINT lpiResult;   // Contains the result of last operation
} I2C_PACKET, *PI2C_PACKET;

// I2C Transfer Block
typedef struct
{
    I2C_PACKET *pI2CPackets;
    INT32 iNumPackets;
} I2C_TRANSFER_BLOCK, *PI2C_TRANSFER_BLOCK;

//------------------------------------------------------------------------------
// Functions
//------------------------------------------------------------------------------
HANDLE I2COpenHandle(LPCWSTR lpDevName);
BOOL I2CCloseHandle(HANDLE hI2C);
BOOL I2CSetSlaveMode(HANDLE hI2C);
BOOL I2CSetMasterMode(HANDLE hI2C);
BOOL I2CIsMaster(HANDLE hI2C, PBOOL pbIsMaster);
BOOL I2CIsSlave(HANDLE hI2C, PBOOL pbIsSlave);
BOOL I2CGetClockRate(HANDLE hI2C, PWORD pwClkRate);
BOOL I2CSetClockRate(HANDLE hI2C, WORD wClkRate);
BOOL I2CSetFrequency(HANDLE hI2C, DWORD dwFreq);
BOOL I2CSetSelfAddr(HANDLE hI2C, BYTE bySelfAddr);
BOOL I2CGetSelfAddr(HANDLE hI2C, PBYTE pbySelfAddr);
BOOL I2CTransfer(HANDLE hI2C, PI2C_TRANSFER_BLOCK pI2CTransferBlock);
BOOL I2CReset(HANDLE hI2C);
BOOL I2CEnableSlave(HANDLE hI2C);
BOOL I2CDisableSlave(HANDLE hI2C);
BOOL I2CGetSlaveSize(HANDLE hI2C, PDWORD pdwSize);
BOOL I2CSetSlaveSize(HANDLE hI2C, DWORD dwSize);
BOOL I2CGetSlaveText(HANDLE hI2C, PBYTE pbyTextBuf, DWORD dwBufSize, PDWORD pdwTextLen);
BOOL I2CSetSlaveText(HANDLE hI2C, PBYTE pbyTextBuf, DWORD dwTextLen);

#ifdef __cplusplus
}
#endif

#endif  // __I2CBUS_H__