5502_eeprom.c

外设存储器接口程序

/******************************************************************************/
/*  Copyright 2004 by SEED Electronic Technology LTD.                         */
/*  All rights reserved. SEED Electronic Technology LTD.                      */
/*  Restricted rights to use, duplicate or disclose this code are             */
/*  granted through contract.                                                 */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
/*----------------------------------------------------------------------------*/
/* DESCRIPTION:  															  */
/*   																		  */
/* This is an example of writting and reading E2PROM of DEC_5502			  */
/*----------------------------------------------------------------------------*/
/* MODULE NAME... I2C and E2PROM											  */
/* FILENAME...... 5502_EEPROM.c   											  */
/* DATE CREATED.. Mon 7/20/2004	    										  */
/* COMPONENT..... 															  */
/* PREREQUISITS.. 															  */
/*----------------------------------------------------------------------------*/

#include <csl.h>
#include <csl_pll.h>
#include <csl_i2c.h>
#include <stdio.h>
#include "E2PROM_Function.h"

#undef  	E2PROM_ADDR			// Define slave I2C device address
#define  	E2PROM_ADDR 0x50

/*------------------------------------------------------------------------------------*/
//
// Config I2C: Use I2C to interface E2PROM
//
/*------------------------------------------------------------------------------------*/			
I2C_Setup Setup = {
					0, 		// 7 bit address mode 
					0x0000, // own address 
					60, 	// clkout value (Mhz) 
					400, 	// a number between 10 and 400
					0, 		// 8 bits/byte to be received or transmitted 
					0, 		// DLB mode off 
					0 		// FREE mode off,如果采用7位或10位的寻址模式,必须关闭自由模式 
				  };

// 定义写入8个字,合16个字节
#define DATALEN 0x08

/* Take two bytes addressing mode */
Uint16 SourData[DATALEN];
Uint16 DestData[DATALEN*2];
Uint16 DumyWrite[2] = {0,0};


/*------------------------------------------------------------------------------------*/
//
// FUNCTION: MAIN
//
/*------------------------------------------------------------------------------------*/

void main(void)
{	
	Uint16 i,Return;
	Uint16 StartAdd = 0;
	Uint16 Errcount = 0;
	
// Initialize CSL library - This is REQUIRED !!! 
    CSL_init();
    
// The main frequency of system is 240MHz	
    PLL_setFreq(1, 0xC, 0, 1, 3, 3, 0);

// Initialize I2C, Using parameters in MyI2c_Config structure
	MyI2C_setup(&Setup);
	
    for(i=0;i<DATALEN;i++)
    {
    	DestData[2*i]=0;
    	DestData[2*i+1]=0;
    	SourData[i] = (2*i<<8)+2*i+1;	
    }
    
    StartAdd = 0;
/*--------------  write---------------------------------------*/
  	for(i=0; i<DATALEN; i++)
   	{
   		Return = MyI2C_WriteSigWord( StartAdd, SourData[i], 1, E2PROM_ADDR, 1, 30000);
    	while(Return!=0);
    	StartAdd += 2;
   	}	
             
/*--------------  read ---------------------------------------*/
// Perform dumy write operation
    MyI2C_Write( DumyWrite,	//pointer to data array
	   	       2,					//length of data to be transmitted: 
	    	   1,					//master or slaver
	    	   E2PROM_ADDR,			//slave address to transmit to
	    	   1,					//transfer mode of operation
	    	   30000				//time out for bus busy
	    	   );   
	
    MyI2C_Read( DestData,
              DATALEN*2,			// receives bytes of data 
              1,					// in master receiver 
              E2PROM_ADDR,			// Slave I2C address 
              1,					// 该方式位必须正确设置,否则EEPROM会将数据线和时钟线拉低
              30000,				// with a timeout of 30000 
              0);					// and check for bus busy on
  	
/*----------------judge --------------------------------------------*/
	Errcount = 0;
    for(i=0; i<DATALEN; i++)
    {
    	if(DestData[2*i] != (SourData[i]&0xFF00)>>8)
    	Errcount++;
    	if(DestData[2*i+1] != (SourData[i]&0x00FF))
    	Errcount++;
    }
    
    if(Errcount != 0)
    printf("SEED_DEC5502 EEPROM 操作失败\n");
    else
    printf("SEED_DEC5502 EEPROM 操作成功\n");
}

/******************************************************************************/
//	No more
/******************************************************************************/