top0_dss.c

瑞萨CAN通讯单片机程序

/*""FILE COMMENT""*****************************************************
 *	M32R C Programming		Rev. 1.00
 *		< Sample Program for TOP0 delayed single-short output mode >
 *
 *	Copyright (c) 2003 Renesas Technology Corporation
 *			   And Renesas Solutions Corporation
 *			   All Rights Reserved
 *********************************************************************/

/************************************************************************/
/*		Include file						*/
/************************************************************************/

#include		"..\inc\sfr32170_pragma.h"

/************************************************************************/
/*		Definition of external reference			*/
/************************************************************************/

extern	void		DisInt( void );				/* Interrupt disable function */
extern	void		EnInt( void );				/* Interrupt enable function */

/************************************************************************/
/*		Function prototype declaration				*/
/************************************************************************/

	void		TOP0_DSS_init( void );			/* Initialize TOP0 delayed single-shot output mode */
	unsigned long	TOP0_DSS_out( unsigned short, unsigned short );	/* Start TOP0 delayed single-shot output */
	unsigned long	TOP0_DSS_cc( signed short );			/* Correct single-shot output time */

/************************************************************************/
/*		Define macro						*/
/************************************************************************/

#define OK	1
#define NG	0

/*** Delayed single-shot(TOP0) ***/

							/* 0123 4567 89AB CDEF	*/
#define	TOP0_MASK		(unsigned short)0x0373	/* 0000 0011 0111 0011B	*/
#define	TOP0_DSS		(unsigned short)0x0100	/* 0000 0001 0000 0000B	*/
							/*	  ||  |||   ++- Select clock bus 0	*/
							/*	  ||  +++------ don't care		*/
							/*	  ++-------- Set TOP0 delayed single-shot output mode */

/*""FUNC COMMENT""*******************************************************
 * Function name: TOP0_DSS_init()
 *-----------------------------------------------------------------------
 * Description	: Set TOP0 delayed single-shot output modeInitial settings necessary to drive TOP0 in
 *		: delayed single-shot mode
 *		: - While using TOP0 in delayed single-shot mode, this function outputs a single-shot waveform from
 *		:   the TO0 pin
 * 		: - The count source used for this operation is clock bus 0
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: The prescaler, clock bus, etc. are set separately from the above
 * 		: Must be executed while interrupts are disabled
 *""FUNC COMMENT END""***************************************************/
void	TOP0_DSS_init()
{

/*** Initializing P110 (TO0) output(low level output) ***/

	FFP0 = ~FP0;						/* Enable F/F0 rewrite */
	FFD0 = 0x0000;				/* F/F0 low(0) output (inverted to high during single-shot output) */
	P11MOD |= 0x80;						/* Select TO0 (TOP0 output) for output */

/*** Setting delayed single-shot(TOP0) ***/

	TOP05CR0 = ( TOP05CR0 & ~TOP0_MASK) | TOP0_DSS;		/* Set TOP0 delayed single-shot */
	TOPIR1 |= TOPIM0;					/* Disable TOP0 interrupt */
}

/*""FUNC COMMENT""*******************************************************
 * Function name: TOP0_DSS_out()
 *-----------------------------------------------------------------------
 * Description	: Drive TOP0 in delayed single-shot mode
 *-----------------------------------------------------------------------
 * Argument	: unsigned short delay	delay time
 * 		: unsigned short PW	pulse width
 *-----------------------------------------------------------------------
 * Returns	: Terminated normally		1
 * 		: Terminated abnormally		0
 * 		:	 - delay time = 0
 * 		:	 - pulse width = 0
 * 		:	 - Immediately before single-shot output or during output
 *-----------------------------------------------------------------------
 * Notes	: The rewrite timing judgment value needs to be calculated according to the count source
 *""FUNC COMMENT END""***************************************************/
unsigned long	TOP0_DSS_out( unsigned short delay, unsigned short PW)
{
	unsigned short	work;

	if(( delay == 0) || ( PW == 0)) {			/* Determine delay time and pulse width */
		return( NG);
	}

	if((( TOPCEN & TOP0CEN) != 0)				/* Determine rewrite timing */
	  && (( TOP0CT <= 1) || (( FFD0 & FD0) != 0))) {	/* Multiple startup or immediately before end */
		return( NG);
	}

/*** Setting counter and reload register ***/

	work = delay - 1;
	TOP0CT = work;
	TOP0RL = PW - 1;

/*** Starting count (even while counting) ***/

	DisInt();						/* Disable interrupt */

	TOPPRO = ~TOP0PRO;					/* Enable TOP0 enable protect rewrite */
	TOPCEN = 0xffff;					/* Start TOP0 count */

	while( TOP0CT == work);					/* Wait until count start */

	EnInt();						/* Enable interrupt */

	return( OK);
}

/*""FUNC COMMENT""*******************************************************
 * Function name: TOP0_DSS_cc()
 *-----------------------------------------------------------------------
 * Description	: Correct TOP0 single-shot output time
 *-----------------------------------------------------------------------
 * Argument	: signed short cc	correction time
 *-----------------------------------------------------------------------
 * Returns	: Terminated normally		1
 * 		: Terminated abnormally		0
 * 		:	 correction time = 0
 * 		:	 - No sufficient time for correction (immediately before end of single-shot output)
 * 		:	   Timing at (5) below
 * 		:
 * 		:    (1)      (2)  (3)	  (4)	 (5)
 * 		:	   |	   | |		 | |
 * 		:    Count start   | |		 | |
 * 		:	   |	     +-------------+
 * 		:	   V	     |		   |
 * 		:  ------------------+		   +----------
 * 		:
 *-----------------------------------------------------------------------
 * Notes	: The rewrite timing judgment value needs to be calculated according to the count source
 * 		: (Note that correction is made synchronously with the next active clock transition)
 * 		: Overflow after correction is not taken into consideration
 *""FUNC COMMENT END""***************************************************/
unsigned long	TOP0_DSS_cc( signed short cc)
{
	if( cc == 0) {
		return( NG);
	}

	DisInt();						/* Disable interrupt */

	if(( TOPCEN & TOP0CEN) == 0) {				/* Count halted? */
		TOP0RL += cc;					/* Timing at (1) */
	} else if( TOP0CT >= 2) {
		if(( FFD0 & FD0) != 0) {			/* During delay? */
			TOP0CC = cc - 1;			/* Timing at (4) */
		} else {
			TOP0RL += cc;				/* Timing at (2) */
		}
	} else {
		if(( FFD0 & FD0) != 0) {			/* During delay? */
			return( NG);				/* Timing at (5) */
		} else {
			while(( FFD0 & FD0) == 0);		/* Wait for end of delay, timing at (3) */
			TOP0CC = cc - 1;
		}
	}
	EnInt();						/* Enable interrupt */

	return( OK);
}