/**************************************************************************************/
/*														Misc.c, Libcyc source file															*/
/*														 Miscellaneous functions																*/
/*												Copyright(C)1999 Peter Armstrong														*/
/*																	Release 2.0																				*/
/**************************************************************************************/

/* includes */ 
 
#include 	<libps.h>
#include	"stdlib.h"
#include 	"sys\ioctl.h"
#include	"sys\file.h"
#include	"pad.h"
 
#include	"misc.h"
#include	"sendrec.h"
#include	"cycfcntl.h"
#include	"packets.h"
 
/* externs */
 
extern long _gp;									
struct link_info link;

/* globals */

int	time[TIME_NUM];			/* pal/ntsc timer values */
void	(*vs_func)();			/* pointer to application's VSyncCallback function */

volatile	u_int	vs_timer = 0;			/* timer updated every vertical interrupt */

int		port_fd;									/* port file descriptor */
int		vs_cmd = 1;						/* callback command processing enabled when set */

 
/*------------------------------------------------------------------------------------*/
/* Flush serial port buffer	(on read error)																						*/
/*	Arguments:																																				*/
/*		none																																						*/
/*	Return value:																																			*/
/*		none																																						*/
/*------------------------------------------------------------------------------------*/
void	Sio_Flush(void)
{
	ioctl(port_fd,FIOCSCAN,1);
	ioctl(port_fd,TIOCFLUSH,1);
} 
 
 
/**************************************************************************************/
/* Open serial port,initialize callback function, test connection type, sort time vals*/
/*	Arguments:																																				*/
/*		none																																						*/
/*	Return value:																																			*/
/*		1	- port opened																																	*/
/*		0	-	cannot open port																														*/
/**************************************************************************************/
int	sio_open(void)
{	
	int i,fps;
	
	if((port_fd = open("tty:",O_RDWR | O_NBLOCK)) >= 0)
	{
		close(1);		/* close standard i/o streams */
		close(0);

		ioctl(port_fd,TIOCRTS,1);			/* RTS line dropped when above closed, set high again */	
		ioctl(port_fd,TIOCRAW,0);			/* disable software flow control */


		/* sort timing values depending on video mode */
		fps = (GetVideoMode()) ? 50 : 60;  /* pal/ntsc */

		time[HALF_SEC] = fps>>1;

		for(i = 1; i < TIME_NUM;i++)
		{
			time[i] = fps * i;
		}		
		
		VSyncCallback(vs_Callback);		/* init library callback function */

		/* if not connected to PC, increase port baud rate */
		if(cyc_ping() != PNG_PC)
			ioctl(port_fd,TIOCBAUD,960000);		/* not right, but speeds things up */	
		
		return OK;
	}
	return NG;		/* couldn't get port fd */
}
 
 
/**************************************************************************************/
/* Close serial port, clear callback function																				  */
/*	Arguments:																																				*/
/*		none																																						*/
/*	Return value:																																			*/
/*		none																																						*/
/**************************************************************************************/
void	sio_close(void)
{
	VSyncCallback(NULL);
	close(port_fd); 
}
 

/*------------------------------------------------------------------------------------*/
/* VSyncCallback function; scan port, process cmds, execute app's callback function		*/
/*	Arguments:																																				*/
/*		none																																						*/
/*	Return value:																																			*/
/*		none																																						*/
/*------------------------------------------------------------------------------------*/
void	vs_Callback(void)
{ 
	__asm__ volatile ("la $28, _gp");
	
	vs_timer++;														/*  50/60th sec counter */
	
	ioctl(port_fd,FIOCSCAN,1);						/* shift port data to internal buffer */

	if(vs_cmd)							
		vs_PsxCmds();				/* read/write commands */

	if(vs_func)
		vs_func();						/* execute applications VSyncCallback function if there is one */
}

 
/**************************************************************************************/
/* Chain application's callback function																						  */
/*	Arguments:																																				*/
/*		*f	-	address of application function																						*/
/*	Return value:																																			*/
/*		none																																						*/
/**************************************************************************************/
void	chain_callback(void (*f)())
{ 
	vs_func = f;
}