noise_cap.c

瑞萨CAN通讯单片机程序

/*  FILE COMMENT   ****************************************************
 *	M32R C Programming		Rev. 1.00
 *		< Sample Program for TIO5 noize processing input & TML0 Capture >
 *
 *	Copyright (c) 2003 Renesas Technology Corporation
 *			   And Renesas Solutions Corporation
 *			   All Rights Reserved
 **********************************************************************/

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

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

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

	void		main(void);			/* Main function */
	void		init_func(void);		/* Initial setup function */
	void		port_init(void);		/* Initialize port */
	void		TIO5_noise_init( void );	/* Initialize TIO5 noise processing input mode */
	void		TML0_Cap_init( void );		/* Initialize TML0 capture input */
	void		TIO5_noiseInt( void );		/* Process TIO5 noise processing input interrupt (user processing) */
	void		TIO4_7_Int(void);		/* Process TIO4-7 output interrupt */

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

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

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

/*** Noise processing input (TIO5) ***/

						/* 0123 4567	*/
#define	IEB03_MASK	(unsigned char)0xc4	/* 1100 0100B	Clock bus & input event bus control register		*/
#define	IEB03_INIT	(unsigned char)0x04	/* 0000 0100B	*/
						/* ||	 +----- Input event bus 0 :Select TIO5 (TIO5 output) for output	*/
						/* ++---------- Input event bus 3 :TIN3					*/

						/* 0123 4567 89AB CDEF	*/
#define	TIN3_MASK	(unsigned short)0x0700	/* 0000 0111 0000 0000B	*/
#define	TIN3_HLevel	(unsigned short)0x0600	/* 0000 0110 0000 0000B	*/
						/*	 +++------------ Set high on TIN3 to be the active level	*/

						/* 0123 4567	*/
#define	TIO5_Noise	(unsigned char)0x9e	/* 1001 1110B	*/
						/* |||| |+++--- Set TIO5 noise processing input mode	*/
						/* |||+-+------ Measurement input source :		*/
						/* |||			Input event bus 3 selected	*/
						/* +++--------- Select clock bus 0			*/

#define	TIO5_NoiseTime	(unsigned short)100 - 1	/* Count value for noise judgment time */

/*** Capture(TML0) ***/

						/* 0123 4567	*/
#define	TML0SS0_MASK	(unsigned char)0x81	/* 1000 0001B	TML0 control register			*/
#define	TML0SS0_IEB0	(unsigned char)0x80	/* 1000 0000B						*/
						/* |	   +--- Select 1/2 internal peripheral clock	*/
						/* +----------- Input event bus 0 selected		*/

/************************************************************************/
/*		Global variable						*/
/************************************************************************/

	unsigned long	capture_time;			/* Measurement count value */

/*""FUNC COMMENT""*******************************************************
 * Function name: init_func()
 *-----------------------------------------------------------------------
 * Description	: Initialize ICU
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	:
 *""FUNC COMMENT END""***************************************************/
void init_func(void)
{
	port_init();					/* Initialize those related to port */
}

/*""FUNC COMMENT""*******************************************************
 * Function name :port_init()
 *-----------------------------------------------------------------------
 * Description	: Initialize port
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	:
 *""FUNC COMMENT END""***************************************************/
void port_init(void)
{
	PIEN = PIEN0;					/* Enable port input */

	P11DATA = 0x00;					/* Output data (must be set prior to mode) */
	P11DIR = 0xff;					/* P110-P117 : Output mode */
	P11MOD = 0x00;					/* P110-P117 : Input/output port */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : TIO5_noise_init()
 *-----------------------------------------------------------------------
 * Description	: Initialize TIO5 noise processing input mode
 *		: - TIO5 is used in noise processing input mode to detect 
 *		:   high on TIN3 via input event bus 3
 *		: - Output TIO5 underflow to input event bus 0 (to TML0_Cap0)
 *		: - Use clock bus 0 as a count source
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Set prescaler, clock bus, etc. separately
 *		: Set functions of ICU's interrupt control related registers separately
 *		: Port input function must be enabled
 *		: For M32R/E#1,2,3, PnMOD cannot be accessed for R/M/W
 *		: The function must be executed while interrupt is disabled
 *""FUNC COMMENT END""***************************************************/
void	TIO5_noise_init()
{
	unsigned char	temp;

	PRS0 = ( 100 - 1);					/* Set prescaler(10us@10MHz) */

/*** Setting input event bus 0,3 ***/

	CKIEBCR = ( CKIEBCR & ~IEB03_MASK) | IEB03_INIT;	/* Select input event bus 0,3 for input */

/*** Setting noise processing input mode (TIO5) ***/

	TIO5CR = TIO5_Noise;					/* Set TIO5 noise processing input mode */
	TIO5RL0 = TIO5_NoiseTime;				/* Set TIO5 noise judgment time */

/*** Setting P153 (TIN3) high level active ***/

	TINCR0 = ( TINCR0 & ~TIN3_MASK) | TIN3_HLevel;		/* Set high on TIN3 to be the active level */
	P15MOD |= 0x10;						/* Select P153 for TIN */

/*** Setting interrupt (TIO5) ***/

	temp = TIOIR1;
	temp |= ( TIOIS7 | TIOIS6 | TIOIS4);
	temp &= ~( TIOIS5 | TIOIM5);				/* Enable TIO5 interrupt */
	TIOIR1 = temp;
	IMJTOCR4 = 0x01;					/* TIO4-7 ILEVEL=1 */

/*** Setting interrupt (TIN3) ***/

	temp = TINIR1;
	temp |= ( TINIS4 | TINIS5 | TINIS6) | TINIM3;		/* Disable TIN3 interrupt */
	TINIR1 = temp;

/*** Starting count ***/

	TIOPRO = ~TIO5PRO;					/* Enable TIO5 enable protect rewrite */
	TIOCEN = 0xffff;					/* Starting count TIO5 */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : TML0_Cap_init()
 *-----------------------------------------------------------------------
 * Description	: Initialize TML0 capture input
 *		: - Capture upon input event bus 0 (TIO5 underflow)
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: TML0 counter is not initialized
 *		: Counter start counting upon reset 
 *		: The function must be executed while interrupt is disabled
 *""FUNC COMMENT END""***************************************************/
void	TML0_Cap_init()
{
/*** Setting measure timer (TML0) ***/

	TML0CR = ( TML0CR & ~TML0SS0_MASK) | TML0SS0_IEB0;	/* TML0 measure 0 -> input event bus 0 (TIO5 underflow) */
}

/*""FUNC COMMENT""*******************************************************
 * Function name: main()
 *-----------------------------------------------------------------------
 * Description	: - Interrupt processing is executed when TIO5 is operated
 *		:   in noise processing input mode and high-level duration
 *		:   on TIN3 is 1ms or more (source clock frequency: 10 MHz)
 *		:   LED (PORT11) is incremented when an interrupt occurred
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: -
 *""FUNC COMMENT END""***************************************************/
void main(void)
{
	DisInt();						/* Disable interrupt */

	init_func();

	TML0_Cap_init();					/* Set TML0 capture */
	TIO5_noise_init();					/* Start TIO5 count */

	EnInt();						/* Enable interrupt */

	while(1);
}

/*""FUNC COMMENT""*******************************************************
 * Function name : TIO4_7_Int()
 *-----------------------------------------------------------------------
 * Description	: - Process TIO4-7 output interrupt
 *		:   Clear request if the interrupt is TIO5 interrupt and 
 *		:   TIO5 interrupt processing will be executed
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: TIO4,6,7 output interrupt not considered
 *""FUNC COMMENT END""***************************************************/
void TIO4_7_Int(void)
{
	unsigned char	temp;

/*** Interrupt judgment(TIO5) ***/

	if(( TIOIR1 & TIOIS5) != 0) {
		DisInt();					/* Disable interrupt */
		temp = TIOIR1;
		temp |= ( TIOIS4 | TIOIS6 | TIOIS7);
		temp &= ~TIOIS5;				/* Clear TIN0 interrupt request */
		TIOIR1 = temp;
		EnInt();					/* Enable interrupt */

		TIO5_noiseInt();				/* Process TIO5 interrupt */
	}
}
/*""FUNC COMMENT""*******************************************************
 * Function name: TIO5_noiseInt()
 *-----------------------------------------------------------------------
 * Description	: Process TIO5 interrupt
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * 拲堄帠崁 	: In the noise processing mode, the counter is stopped upon
 *		: an underflow and count must be started over again to	
 *		: restart processing. The interrupt processing time until 
 *		: recount is not considered 
 *""FUNC COMMENT END""***************************************************/
void	TIO5_noiseInt()
{
	DisInt();						/* Disable interrupt */
	TIOPRO = ~TIO5PRO;					/* TIO5 Enable TIO5 enable protect rewrite */
	TIOCEN = 0xffff;					/* TIO5 Starting count TIO5 */
	EnInt();						/* Enable interrupt */

	(P11DATA)++;						/* Increment the port when an interrupt occurred */
	capture_time = TML0MR0;					/* Copy the TML0 measure 0 register value to the RAM */

}