#if !defined(DSI_SIUSBXP_3_1_H)
#define DSI_SIUSBXP_3_1_H
// The following ifdef block is the standard way of creating macros which make exporting
// from a DLL simpler. All files within this DLL are compiled with the SI_USB_XP_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see
// SI_USB_XP_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef SI_USB_XP_EXPORTS
#define SI_USB_XP_API __declspec(dllexport)
#else
#define SI_USB_XP_API __declspec(dllimport)
#endif


// Return codes
#define      SI_SUCCESS               0x00
#define      SI_DEVICE_NOT_FOUND         0xFF
#define      SI_INVALID_HANDLE         0x01
#define      SI_READ_ERROR            0x02
#define      SI_RX_QUEUE_NOT_READY      0x03
#define      SI_WRITE_ERROR            0x04
#define      SI_RESET_ERROR            0x05
#define      SI_INVALID_PARAMETER      0x06
#define      SI_INVALID_REQUEST_LENGTH   0x07
#define      SI_DEVICE_IO_FAILED         0x08
#define      SI_INVALID_BAUDRATE         0x09
#define      SI_FUNCTION_NOT_SUPPORTED   0x0a
#define      SI_GLOBAL_DATA_ERROR      0x0b
#define      SI_SYSTEM_ERROR_CODE      0x0c
#define      SI_READ_TIMED_OUT         0x0d
#define      SI_WRITE_TIMED_OUT         0x0e
#define      SI_IO_PENDING            0x0f

// GetProductString() function flags
#define      SI_RETURN_SERIAL_NUMBER      0x00
#define      SI_RETURN_DESCRIPTION      0x01
#define      SI_RETURN_LINK_NAME         0x02
#define      SI_RETURN_VID            0x03
#define      SI_RETURN_PID            0x04

// RX Queue status flags
#define      SI_RX_NO_OVERRUN         0x00
#define      SI_RX_EMPTY               0x00
#define      SI_RX_OVERRUN            0x01
#define      SI_RX_READY               0x02

// Buffer size limits
#define      SI_MAX_DEVICE_STRLEN      256
#define      SI_MAX_READ_SIZE         4096*16
#define      SI_MAX_WRITE_SIZE         4096

// Type definitions
typedef      int      SI_STATUS;
typedef      char   SI_DEVICE_STRING[SI_MAX_DEVICE_STRLEN];

// Input and Output pin Characteristics
#define      SI_HELD_INACTIVE         0x00
#define      SI_HELD_ACTIVE            0x01
#define      SI_FIRMWARE_CONTROLLED      0x02
#define      SI_RECEIVE_FLOW_CONTROL      0x02
#define      SI_TRANSMIT_ACTIVE_SIGNAL   0x03
#define      SI_STATUS_INPUT            0x00
#define      SI_HANDSHAKE_LINE         0x01

// Mask and Latch value bit definitions
#define      SI_GPIO_0               0x01
#define      SI_GPIO_1               0x02
#define      SI_GPIO_2               0x04
#define      SI_GPIO_3               0x08

// GetDeviceVersion() return codes
#define      SI_CP2101_VERSION         0x01
#define      SI_CP2102_VERSION         0x02
#define      SI_CP2103_VERSION         0x03


#ifdef __cplusplus
extern "C" {
#endif

SI_USB_XP_API
SI_STATUS WINAPI SI_GetNumDevices(
   LPDWORD lpdwNumDevices
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_GetProductString(
   DWORD dwDeviceNum,
   LPVOID lpvDeviceString,
   DWORD dwFlags
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_Open(
   DWORD dwDevice,
   HANDLE* cyHandle
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_Close(
   HANDLE cyHandle
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_Read(
   HANDLE cyHandle,
   LPVOID lpBuffer,
   DWORD dwBytesToRead,
   LPDWORD lpdwBytesReturned,
   OVERLAPPED* o
         #if defined(__cplusplus)
            = NULL
         #endif
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_Write(
   HANDLE cyHandle,
   LPVOID lpBuffer,
   DWORD dwBytesToWrite,
   LPDWORD lpdwBytesWritten,
   OVERLAPPED* o
         #if defined(__cplusplus)
            = NULL
         #endif
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_DeviceIOControl(
   HANDLE cyHandle,
   DWORD dwIoControlCode,
   LPVOID lpInBuffer,
   DWORD dwBytesToRead,
   LPVOID lpOutBuffer,
   DWORD dwBytesToWrite,
   LPDWORD lpdwBytesSucceeded
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_FlushBuffers(
   HANDLE cyHandle,
   BYTE FlushTransmit,
   BYTE FlushReceive
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_SetTimeouts(
   DWORD dwReadTimeout,
   DWORD dwWriteTimeout
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_GetTimeouts(
   LPDWORD lpdwReadTimeout,
   LPDWORD lpdwWriteTimeout
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_CheckRXQueue(
   HANDLE cyHandle,
   LPDWORD lpdwNumBytesInQueue,
   LPDWORD lpdwQueueStatus
   );

SI_USB_XP_API
SI_STATUS   WINAPI SI_SetBaudRate(
   HANDLE cyHandle,
   DWORD dwBaudRate
   );

SI_USB_XP_API
SI_STATUS   WINAPI SI_SetBaudDivisor(
   HANDLE cyHandle,
   WORD wBaudDivisor
   );

SI_USB_XP_API
SI_STATUS   WINAPI SI_SetLineControl(
   HANDLE cyHandle,
   WORD wLineControl
   );

SI_USB_XP_API
SI_STATUS   WINAPI SI_SetFlowControl(
   HANDLE cyHandle,
   BYTE bCTS_MaskCode,
   BYTE bRTS_MaskCode,
   BYTE bDTR_MaskCode,
   BYTE bDSR_MaskCode,
   BYTE bDCD_MaskCode,
   BOOL bFlowXonXoff
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_GetModemStatus(
   HANDLE cyHandle,
   PBYTE ModemStatus
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_SetBreak(
   HANDLE cyHandle,
   WORD wBreakState
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_ReadLatch(
   HANDLE cyHandle,
   LPBYTE   lpbLatch
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_WriteLatch(
   HANDLE cyHandle,
   BYTE   bMask,
   BYTE   bLatch
   );


SI_USB_XP_API
SI_STATUS WINAPI SI_GetPartNumber(
   HANDLE cyHandle,
   LPBYTE   lpbPartNum
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_GetDLLVersion(
   DWORD* HighVersion,
   DWORD* LowVersion
   );

SI_USB_XP_API
SI_STATUS WINAPI SI_GetDriverVersion(
   DWORD* HighVersion,
   DWORD* LowVersion
   );

#ifdef __cplusplus
}
#endif

#endif // !defined(DSI_SIUSBXP_3_1_H)