eeprom.c

RFID模块 RF24E1读卡程序,用Keil C编译成功!

/*= eeprom.c ===================================================================
 *
 * Copyright (C) 2004 Nordic Semiconductor
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT
 * WARRANTY OF ANY KIND.
 *
 * Author(s): Ole Saether
 *
 * COMPILER:
 *
 *   This program has been tested with Keil C51 V7.09
 *
 * $Revision: 3 $
 *
 *==============================================================================
*/
//#include "nrfexx.h"
//#include "util.h"
#include "eeprom.h"

#define EE_WRSR     0x01
#define EE_WRITE    0x02
#define EE_READ     0x03
#define EE_WRDI     0x04
#define EE_RDSR     0x05
#define EE_WREN     0x06

void EEInit(void)
{

    P0_DIR &= ~0x01;                        // EECSN is output
    SPICLK = 2;                             // CLK/32 SPI clock
    EECSN = 1;
    SPI_CTRL = 0x01;                        // Connect internal SPI to P1
}

unsigned char EEStatus(void)
{
    unsigned char b;

    EECSN = 0;
    SpiReadWrite(EE_RDSR);
    b = SpiReadWrite(0);
    EECSN = 1;
    return b;
}
/***************************************************************************************
  Function:        	EERead
  Description:     	从eeprom中读出一个数据
  Calls:            SpiReadWrite()；
  Called By:      
  			 		void EERxbyte(unsigned int addr_str,unsigned char *a)
  Input:  			
  			 addr: 要读出数据的地址    					 		   
  Output:    
  Return:         	
             b：读出的数据	
  Others:    
***************************************************************************************/
unsigned char EERead(unsigned int addr)
{
    unsigned char b;

    while ((EEStatus() & 0x01) != 0x00)     // Wait if busy
        ;
    EECSN = 0;
    SpiReadWrite(EE_READ);
    SpiReadWrite(addr >> 8);
    SpiReadWrite(addr & 0xff);
    b = SpiReadWrite(0);
    EECSN = 1;
    return b;
}
/***************************************************************************************
  Function:        	EEWrite
  Description:     	写一个数据到eeprom中，
  Calls:            SpiReadWrite()；
  Called By:      
  			 		vvoid EEWxbyte(unsigned int addr_str,unsigned char *a)
  Input:  			
  			 addr: 要写入的地址  b，要写入的数据  					 		   
  Output:    
  Return:    	
  Others:    
***************************************************************************************/
void EEWrite(unsigned int addr, unsigned char b)
{
    while((EEStatus() & 0x01) != 0x00)      // Wait if busy
        ;
    EECSN = 0;
    SpiReadWrite(EE_WREN);
    EECSN = 1;
    EECSN = 0;
    SpiReadWrite(EE_WRITE);
    SpiReadWrite(addr >> 8);
    SpiReadWrite(addr & 0x00ff);
    SpiReadWrite(b);
    EECSN = 1;
}

/***************************************************************************************
  Function:        	EEWxbyte
  Description:     	连续的写四个数到eeprom中
  Calls:            EEWrite(unsigned int addr, unsigned char b)
  Called By:      
  			 		void main(void)
  Input:  			
  			 addr: 写数据的开始地址  a：写入数据的开始地址 I:写入数据的个数 					 		   
  Output:    a[0]-a[I-1]; 
  Return:         	          	
  Others:    
***************************************************************************************
void EEWxbyte(unsigned int addr_str,unsigned char *a,unsigned char I)
{
   unsigned char i;
   unsigned char *snr;
   memcpy(snr,a,I);
   for(i=0;i++;i<I)
   {
    EEWrite(addr_str, snr[i]);
	//EEWrite(addr_str, 0x23);
	addr_str++;
   }
   memcpy(a,snr,I); 
}   

***************************************************************************************
  Function:        	EERxbyte
  Description:     	连续的写四个数到eeprom中
  Calls:            EERrite(unsigned int addr, unsigned char b)
  Called By:      
  			 		void main(void)
  Input:  			
  			 addr: 读数据的开始地址  a：读数据的开始地址 I:写入数据的个数 					 		   
  Output:    a[0]-a[i]; 
  Return:         	          	
  Others:    
***************************************************************************************
void EERxbyte(unsigned int addr_str,unsigned char *a,unsigned char I)
{
   unsigned char i;
   unsigned char *snr;
   memcpy(snr,a,I);
   for(i=0;i++;i<I)
   {
    snr[i] = EERead(addr_str);
	addr_str++;
   } 
   memcpy(a,snr,I) ;
}   
*/