/*****************************************************************************/
/*                                                                           */
/*                                 serial.h                                  */
/*                                                                           */
/*                         Serial communication API                          */
/*                                                                           */
/*                                                                           */
/*                                                                           */
/* (C) 2003      Ullrich von Bassewitz                                       */
/*               Römerstrasse 52                                             */
/*               D-70794 Filderstadt                                         */
/* EMail:        uz@cc65.org                                                 */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
/*                                                                           */
/*****************************************************************************/



#ifndef _SERIAL_H
#define _SERIAL_H



/*****************************************************************************/
/*			  	     Data				     */
/*****************************************************************************/



/* Baudrate settings */
#define SER_BAUD_45_5           0x00
#define SER_BAUD_50            	0x01
#define SER_BAUD_75             0x02
#define SER_BAUD_110           	0x03
#define SER_BAUD_134_5         	0x04
#define SER_BAUD_150            0x05
#define SER_BAUD_300           	0x06
#define SER_BAUD_600           	0x07
#define SER_BAUD_1200          	0x08
#define SER_BAUD_1800           0x09
#define SER_BAUD_2400          	0x0A
#define SER_BAUD_3600           0x0B
#define SER_BAUD_4800          	0x0C
#define SER_BAUD_7200           0x0D
#define SER_BAUD_9600          	0x0E
#define SER_BAUD_19200         	0x0F
#define SER_BAUD_38400         	0x10
#define SER_BAUD_57600         	0x11
#define SER_BAUD_115200        	0x12
#define SER_BAUD_230400        	0x13

/* Data bit settings */
#define SER_BITS_5             	0x00
#define SER_BITS_6             	0x01
#define SER_BITS_7             	0x02
#define SER_BITS_8             	0x03

/* Stop bit settings */
#define SER_STOP_1             	0x00    /* One stop bit */
#define SER_STOP_2             	0x01    /* Two stop bits */

/* Parity settings */
#define SER_PAR_NONE           	0x00
#define SER_PAR_ODD            	0x01
#define SER_PAR_EVEN           	0x02
#define SER_PAR_MARK           	0x03
#define SER_PAR_SPACE          	0x04

/* Handshake settings. The latter two may be combined. */
#define SER_HS_NONE             0x00    /* No handshake */
#define SER_HS_HW               0x01    /* Hardware (RTS/CTS) handshake */
#define SER_HS_SW               0x02    /* Software handshake */

/* Bit masks to mask out things from the status returned by ser_status.
 * These are 6551 specific and must be mapped by drivers for other chips.
 */
#define SER_STATUS_PE          	0x01	/* Parity error */
#define SER_STATUS_FE  	       	0x02	/* Framing error */
#define SER_STATUS_OE           0x04	/* Overrun error */
#define SER_STATUS_DCD 	       	0x20	/* NOT data carrier detect */
#define SER_STATUS_DSR 	       	0x40	/* NOT data set ready */

/* Error codes returned by all functions */
#define SER_ERR_OK     	       	0x00	/* Not an error - relax */
#define SER_ERR_NO_DRIVER       0x01    /* No driver available */
#define SER_ERR_CANNOT_LOAD     0x02    /* Error loading driver */
#define SER_ERR_INV_DRIVER      0x03    /* Invalid driver */
#define SER_ERR_NO_DEVICE       0x04    /* Device (hardware) not found */
#define SER_ERR_BAUD_UNAVAIL   	0x05   	/* Baud rate not available */
#define SER_ERR_NO_DATA	       	0x06   	/* Nothing to read */
#define SER_ERR_OVERFLOW       	0x07   	/* No room in send buffer */
#define SER_ERR_INIT_FAILED     0x08   	/* Initialization failed */
#define SER_ERR_INV_IOCTL       0x09    /* IOCTL not supported */

/* Struct containing parameters for the serial port */
struct ser_params {
    unsigned char       baudrate;       /* Baudrate */
    unsigned char       databits;       /* Number of data bits */
    unsigned char       stopbits;       /* Number of stop bits */
    unsigned char       parity;         /* Parity setting */
    unsigned char       handshake;      /* Type of handshake to use */
};


/*****************************************************************************/
/*				     Code				     */
/*****************************************************************************/



unsigned char __fastcall__ ser_load_driver (const char* driver);
/* Load and install a serial driver. Return an error code. */

unsigned char __fastcall__ ser_unload (void);
/* Uninstall, then unload the currently loaded driver. */

unsigned char __fastcall__ ser_install (void* driver);
/* Install an already loaded driver. Return an error code. */

unsigned char __fastcall__ ser_uninstall (void);
/* Uninstall the currently loaded driver and return an error code.
 * Note: This call does not free allocated memory.
 */

unsigned char __fastcall__ ser_open (const struct ser_params* params);
/* "Open" the port by setting the port parameters and enable interrupts. */

unsigned char __fastcall__ ser_close (void);
/* "Close" the port. Clear buffers and and disable interrupts. */

unsigned char __fastcall__ ser_get (char* b);
/* Get a character from the serial port. If no characters are available, the
 * function will return SER_ERR_NO_DATA, so this is not a fatal error.
 */

unsigned char __fastcall__ ser_put (char b);
/* Send a character via the serial port. There is a transmit buffer, but
 * transmitting is not done via interrupt. The function returns
 * SER_ERR_OVERFLOW if there is no space left in the transmit buffer.
 */

unsigned char __fastcall__ ser_status (unsigned char* status);
/* Return the serial port status. */

unsigned char __fastcall__ ser_ioctl (unsigned char code, void* data);
/* Driver specific entry. */



/* End of serial.h */
#endif



