// 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 SISiUSB_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

// GetProductString() function flags
#define		SI_RETURN_SERIAL_NUMBER	0x00
#define		SI_RETURN_DESCRIPTION		0x01

// 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*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		// 01







#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
	);

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
	);


#ifdef __cplusplus
}
#endif