tin_dma.c

瑞萨CAN通讯单片机程序

/*  FILE COMMENT   ****************************************************
 *	M32R C Programming		Rev. 1.00
 *		< Sample Program for TIN-DMAC >
 *
 *	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		init_func(void);			/* Initial setup function */
	void		port_init(void);			/* Initialize port */
	void		dma_init(void);				/* Initialize DMA  */

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

/* DMAC setting data */

						/* 0123 4567	*/
#define	DMA2_INIT	(unsigned char)0x2c	/* 0010 1100B	DMA2 channel control register		*/
						/* |||| |||+---	Destination address fixed		*/
						/* |||| ||+----	Source address fixed			*/
						/* |||| |+-----	Transfer size of 8-bit			*/
						/* |||| +------	Transfer enabled			*/
						/* ||++--------	10: start upon TIN18 input signal	*/
						/* |+----------	No transfer request			*/
						/* +-----------	Normal mode				*/

/* TIN setting data */

						/* 0123 4567 89AB CDEF	*/
#define	TIN18_MASK	(unsigned short)0x3000	/* 0011 0000 0000 0000B	TIN input processing control register 3	*/
#define	TIN18_R_Edge	(unsigned short)0x1000	/* 0001 0000 0000 0000B	*/
						/*   ++---------------- TIN 18 rising edge			*/

/************************************************************************/
/*		Variable definition					*/
/************************************************************************/

unsigned char DMA_DUMMY;

/*""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壔 */
	dma_init();					/* Initialize DMA  */
}

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

/*** LED output port ***/

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

/*** Switch input port ***/

	P13DIR = 0x00;						/* PP130-P137 : Input mode */
	P13MOD |= 0x0020;					/* P132:TIN18 */
	TINCR3 = ( TINCR3 & ~TIN18_MASK) | TIN18_R_Edge;	/* Set rise on TIN18 to be the active edge */
}


/*""FUNC COMMENT""*******************************************************
 * Function name : dma_init()
 *-----------------------------------------------------------------------
 * Description 	: - Initialize DMAC
 *		:   DMA2: transferred upon TIN18 input signal
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Transfer is dummy
 *		: Restart is required if the number of transfers is 256 or more
 *""FUNC COMMENT END""***************************************************/
void dma_init(void)
{
/*** DMA2 initial setting ***/

	DM04ITMK |= DMITMK2;				/* Inhibit DMA2 interrupt */
	DM04ITST = ~DMITST2;				/* Clear DMA2 interrupt request */

	DM2SA = (unsigned short)&DMA_DUMMY;		/* Source address -> dummy */
	DM2DA = (unsigned short)&DMA_DUMMY;		/* Destination address -> dummy */

	DM2TCT = 0xff;					/* Number of DMA2 transfer (256 times) */
	DM2CNT = DMA2_INIT;				/* Start and enable transfer upon TIN18 input signal */
}

/*""FUNC COMMENT""*******************************************************
 * Function name : main()
 *-----------------------------------------------------------------------
 * Description	: - Start DMA2 upon rising edge of TIN18 and count the
 *		:   number of transfers, then output number of edge 
 *		:   inputs (number of transfers) to LED (PORT11)
 *-----------------------------------------------------------------------
 * Argument	: -
 *-----------------------------------------------------------------------
 * Returns	: -
 *-----------------------------------------------------------------------
 * Notes	: Transfer counter is counting down from 255
 *""FUNC COMMENT END""***************************************************/
void main(void)
{
/*** Initialize microcomputer ***/

	DisInt();						/* Disable interrupt */

	init_func();

	EnInt();						/* Enable interrupt */

	while(1) {
		P11DATA = (255 - DM2TCT);			/* Display the value for DM2TCT on LED */
	}
}