k0r_sfr_set.c

NEC upd78F0485 uart通信C代码

/***************************************************************************************************************
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;														
;    NEC Electronics	78K0R/Kx3 Series									
;丂丂														
;亂License Agreement亃
;. This sample program is subject to change without notice.
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;. NEC Electronics does not assume any liability for infringement of patents, copyrights or other intellectual
;  property rights of third parties by or arising from the use of this sample program. No license, express,
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;. Descriptions of commands, program, and other related information in this sample program are provided for
;  illustrative purposes in semiconductor product operation and application examples. The incorporation of
;  this sample program in the design of a customer's equipment shall be done under the full responsibility of
;  the customer. NEC Electronics assumes no responsibility for any losses incurred by customers or third parties
;  arising from the use of this sample program.
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;丂Please use this sample program under the agreement listed above.
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;***************************************************************************************************************
;	78K0R/Kx3 Series	sample program								
;***************************************************************************************************************
;	IIC0 Communication (Master Operation) (SFR Setting)
;***************************************************************************************************************
; [History]
;	2007.07 new
;***************************************************************************************************************/

/***************************************************************************
*	Title:	SFR setting
*---------------------------------------------------------------------------
*	Rev.: 0.00
*---------------------------------------------------------------------------
* Note:
*	fCLK = 20MHz
*	operation mode: fast mode
*	number of data to send: 1 byte
*	number of data to send: 2 byte
*	data to send: A9H
*	slave address: A0H
*   	communication format: 
*	ST + ADR/W + DT + ST + ADR/R + DT + DT + SP
*		ST: start condition
*		SP: stop condition
*		ADR/W: slave address + _W
*		ADR/R: slave address + R
*		DT: data
*	use INTIIC0 (end of IIC0 communication)
*
***************************************************************************/
#pragma	sfr					/* definition for using SFR */
#pragma	NOP					/* definition for using NOP */

void IIC_SMMIN(void);
void IIC_SMMST(void);
void IIC_SMMSP(void);

/***************************************************************************
*	data definition
***************************************************************************/
unsigned char PCTXCT;				/* counter of sending data */
unsigned char PCRXCT;				/* 庴counter of receiving data */
unsigned char PCRXDT;				/* reception data buffer (1 byte) */
unsigned char PCRXBF[20];			/* reception data storage */

unsigned char PCTXSS;				/* status flag
						   0: initial state
						   1: data sending
						   2: data receiving */
unsigned char PCADR;				/* address setting (slave address + R/_W) */

#define	D_IIC_SLV_ADR_W	 0x0A0 			/* slave address + W(0) */
#define	D_IIC_SLV_ADR_R	 (0x0A0+0x1)		/* slave address + R(1) */
#define	D_IIC_SND_SIZE	 0x1			/* number of data to send: 1 byte */
#define	D_IIC_RCV_SIZE	 0x2			/* number of data to receive: 2 bytes */
#define	D_IIC_SND_DATA	 0x0A9			/* data to send */

/***************************************************************************
*	Title:	IIC0 Communication (Master Operation)
*		initial setting
****************************************************************************
*	Module:	void IIC_SMMIN(void)
*	Arg:
*	Ret:
***************************************************************************/
void IIC_SMMIN(void)
{
	IIC0EN = 1;				/* supplies input clock */

	/**************************************************
	  transfer clock setting */
	IICX0 = 0x00;				/* CLX0 = 0: no expansion */

	IICCL0 = 0b00001010;			/* CLD0=0: SCL0 pin was detected at low level
						   DAD0=0: SDA0 pin was detected at low level
						   SMC0=1: operates in fast mode
						   DFC0=0: digital filter off
						   CL01=1, CL00=0: transfer clock = fCLK/96 */

	/**************************************************
	  slave address setting (sets a local address when used as a master device) */
	SVA0 = 0x00;

	/**************************************************
	  sets start condition */
	IICF0 = 0x00;				 /* STCF=0: clear STT0 (start condition) flag
						    IICBSY=0: clear IICBSY (I2C bus status) flag
						    STCEN=0: after operation is enabled (IICE0=1), enable generation of a start condition upon detection of s stop condition
						    IICRSV=0: enable communication reservation */

	/**************************************************
	  IIC0 mode setting */
	IICC0 = 0b00011100;			/* IICE0=0: stop I2C operation
						   LREL0=0: exit from communication: normal operation
						   WREL0=0: do not cancel wait
						   SPIE0=1: enable generation of interrupt request when stop condition is detected
						   WTIM0=1: interrupt request is generated at the ninth clock's falling edge
						   ACKE0=1: enable acknowledge
						   STT0=0: do not generate a start condition
						   SPT0=0: stop condition is not generated */

	IICE0 = 1;				/* enable operation */

	/**************************************************
	 port setting (after IICE0 = 1) */
	P6 = 0b00000000;			/* P61/SDA0 = low level
						   P60/SCL0 = low level */

	PM6.0 = 0;				/* SCL0: output mode */
	PM6.1 = 0;				/* SDA0: output mode */

	IICIF0 = 0;				/* clear interrupt request flag (INTIIC0) */

	if(STCEN == 1){				/* initial start enable trigger ? */
		return;				/*  YES... */
	}

	/**************************************************
	  prepares for starting communication */
	SPT0 = 1;				/* generates a stop condition */

	while(IICIF0 == 0){			/* INTIIC0 occurs? */
		NOP();
	}
	IICIF0 = 0;
}

/***************************************************************************
*	Title: IIC0 Communication (Master Operation)
*		communication processing
****************************************************************************
*	Module:	void IIC_SMMST(void)
*	Arg:
*	Ret:
***************************************************************************/
void IIC_SMMST(void)
{
	PCTXCT = 0;				/* clear counter of sending data */
	PCRXCT = 0;				/* clear counter of receiving data */
	PCTXSS = 1;				/* set status flag to 1 (data sending) */

	while(1){

		/**************************************************
		  set slave address and transfer direction */
		if(PCTXSS == 1){			/* check status flag -> data sending? */
			PCADR = D_IIC_SLV_ADR_W;	/* slave address + W(0) */
		}
		else{
			PCADR = D_IIC_SLV_ADR_R;	/* slave address + R(1) */
		}

		STT0 = 1;				/* generates start condition */

		IIC0 = PCADR;				/* send slave address and direction */

		while(IICIF0 == 0){			/* INTIIC0 occurs? */
			NOP();
		}
		IICIF0 = 0;

		if(ACKD0 == 0){				/* ACK detected? */
			goto JIC_SMMS10;
		}

		/**************************************************
		 detection of transmit/ receive status */
		if(TRC0 == 1){				/* receive status? YES */

			/**************************************************
			  transmit status */
			do{
				IIC0 = D_IIC_SND_DATA;	/* send data */

				while(IICIF0 == 0){	/* INTIIC0 occurs? data sent? */
					NOP();
				}
				IICIF0 = 0;

				if(ACKD0 == 0){		/* ACK detected? NO */
					goto JIC_SMMS10; /* YES */
				}

				PCTXCT++;		/* counter of sending data increment */

				/**************************************************
				  check if transmission ends? */

			} while(PCTXCT != D_IIC_SND_SIZE);	/* transmission ends? */

			PCTXSS = 2;			/* set status flag to 02H -> data receiving */
		}
		else{
			/**************************************************
			 receive status */

			ACKE0 = 1;			/* enable acknowledge */

			WTIM0 = 0;			/* interrupt request is generated at the eighth clock's falling edge */

			do{
				WREL0 = 1;		/* cancel wait */

				while(IICIF0 == 0){	/* INTIIC0 occurs? data received? */
					NOP();
				}
				IICIF0 = 0;

				PCRXDT = IIC0;		/* read receiving data */

				if(PCRXCT == 20-1){	/* receiving data area full? */
					PCRXCT = 0;
				}
				PCRXBF[PCRXCT] = PCRXDT;	/* store receiving data */

				PCRXCT++;			/* counter of receiving data increment */

			/**************************************************
			 check if receiving ends? */
			}while(PCRXCT != D_IIC_RCV_SIZE);	/* receiving ends? */

			ACKE0 = 0;				/* disable acknowledge */

			WTIM0 = 1;				/* interrupt request is generated at the ninth clock's falling edge */

			WREL0 = 1;				/* cancel wait */

			while(IICIF0 == 0){			/* INTIIC0 occurs? */
				NOP();
			}
			IICIF0 = 0;
			break;					/* receiving ends */
		}
	}

	/**************************************************
	 restart */

	/*
	  Please add your program for restarting here. */

JIC_SMMS10:
	NOP();
	NOP();
	NOP();

	IIC_SMMSP();				/* stops communication */
}

/***************************************************************************
*	Title: IIC0 Communication (Master Operation)
*		stops communication
****************************************************************************
*	Module:	void IIC_SMMSP(void)
*	Arg:
*	Ret:
***************************************************************************/
void IIC_SMMSP(void)
{
	SPT0 = 1;				/* generates stop condition */
}