#ifdef SIUSBXP_LIB_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

// RX Queue status flags
#define		SI_RX_NO_OVERRUN			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*4
#define		SI_MAX_WRITE_SIZE			4096*4

// 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

//Port Config definitions
typedef		struct
{
	WORD Mode;			// Push-Pull = 1, Open-Drain = 0
	WORD Reset_Latch;	// Logic High = 1, Logic Low = =0
	WORD Suspend_Latch;	// Logic High = 1, Logic Low = =0
	unsigned char EnhancedFxn;
} PORT_CONFIG;

// Define bit locations for Mode/Latch for Reset and Suspend structures
#define PORT_RI_ON				0x0001
#define PORT_DCD_ON				0x0002
#define PORT_DTR_ON				0x0004
#define PORT_DSR_ON				0x0008
#define PORT_TXD_ON				0x0010
#define PORT_RXD_ON				0x0020
#define PORT_RTS_ON				0x0040
#define PORT_CTS_ON				0x0080

#define PORT_GPIO_0_ON			0x0100
#define PORT_GPIO_1_ON			0x0200
#define PORT_GPIO_2_ON			0x0400
#define PORT_GPIO_3_ON			0x0800

#define PORT_SUSPEND_ON			0x4000	//  Can't configure latch value
#define PORT_SUSPEND_BAR_ON		0x8000	//  Can't configure latch value

// Define bit locations for EnhancedFxn
#define EF_GPIO_0_TXLED				0x01	//  Under device control
#define EF_GPIO_1_RXLED				0x02	//  Under device control
#define EF_GPIO_2_RS485				0x04	//  Under device control
#define EF_RESERVED_0				0x08	//	Reserved, leave bit 3 cleared
#define EF_WEAKPULLUP				0x10	//  Weak Pull-up on
#define EF_RESERVED_1				0x20	//	Reserved, leave bit 5 cleared
#define EF_SERIAL_DYNAMIC_SUSPEND	0x40	//  For 8 UART/Modem signals
#define EF_GPIO_DYNAMIC_SUSPEND		0x80	//  For 4 GPIO signals

#ifdef __cplusplus
extern "C" {
#endif

SI_USB_XP_API
SI_STATUS WINAPI SI_GetNumDevices(
	LPDWORD lpdwNumDevices
	);

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
	);

SI_USB_XP_API 
SI_STATUS WINAPI SI_Write(
	HANDLE cyHandle,
	LPVOID lpBuffer,
	DWORD dwBytesToWrite,
	LPDWORD lpdwBytesWritten
	);

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_ReadLatch (
	HANDLE cyHandle, 
	LPBYTE Latch
	);

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

SI_USB_XP_API
SI_STATUS	WINAPI SI_SetPortConfig(
	HANDLE cyHandle,
	PORT_CONFIG*	PortConfig
	);

SI_USB_XP_API
SI_STATUS	
WINAPI 
SI_GetPortConfig(	
	HANDLE cyHandle,
	PORT_CONFIG*	PortConfig
	);

SI_USB_XP_API
SI_STATUS	
WINAPI 
SI_GetBaudRate(
	HANDLE cyHandle,
	LPDWORD lpdwBaudRate
	);

#ifdef __cplusplus
}
#endif