25045操作标准子程序

# include <stdio.h>
# include <reg52.h>
# define uchar unsigned char
# define uint unsigned int
 sbit SO=P1^1;/*25045输出*/
 sbit SI=P1^2;/*25045输入*/
 sbit SCK=P1^3;/*25045时钟*/
 sbit CS=P1^4;/*25045片选*/
 uchar code WREN_INST=0X06;
 /* Write enable latch instruction (WREN)*/
 uchar code WRDI_INST=0X04;
 /* Write disable latch instruction (WRDI)*/
 uchar code WRSR_INST=0X01;
 /* Write status register instruction (WRSR)*/
 uchar code RDSR_INST=0X05;
 /* Read status register instruction (RDSR)*/
 uchar code WRITE_INST=0X02;
 /* Write memory instruction (WRITE)*/
 /*写入25045的先导字,应当为0000A010,其中的A为写入25045的高位地址
 将此WRITE_INST和写入高位地址相或后即为正确的写先导字*/
 uchar code READ_INST=0X03;
 /* Read memory instruction (READ)*/
 /*读出25045的先导字,应当为0000A011,其中的A为读出25045的高位地址
 将此READ_INST和读出高位地址相或后即为正确的读先导字*/
 uint code BYTE_ADDR=0X55;
 /* Memory address for byte mode operations*/
 uchar code BYTE_DATA=0X11;
 /*Data byte for byte write operation*/
 uint  code PAGE_ADDR=0X1F;
 /* Memory address for page mode operations*/
 /*页面写入的其始地址*/
 uchar code PAGE_DATA1=0X22;
 /* 1st data byte for page write operation*/
 uchar code PAGE_DATA2=0X33;
 /* 2nd data byte for page write operation*/
 uchar code PAGE_DATA3=0X44;
 /* 3rd data byte for page write operation*/
 uchar code STATUS_REG=0X20;
 /* Status register,设置DOG时间设置为200毫秒,无写保护*/
 /*这是状态寄存器的值,他的意义在于第5,第4位为WDI1,WDI0代表DOG的时间,00为1.4秒,01为600毫秒,10为200毫秒,00为disabled
 第3位和第2位为BL1,BL0,是写保护设置位,00为无保护,01为保护180-1FF,10为保护100-1FF,11为保护000-1FF.第1位为WEL,
 当他为1时代表已经"写使能"设置了,现在可以写了,只读位.第0位为WIP,当他为1时代表正在进行写操作,是只读*/
 uchar code  MAX_POLL=0x99;
 /* Maximum number of polls*/
 /*最大写过程时间,确定25045的最大的写入过程的时间*/
 uchar code INIT_STATE=0x09;
 /* Initialization value for control ports*/
 uint code SLIC=0x30;
 /* Address location of SLIC*/
 void wren_cmd(void);/*写使能子程序*/
 void wrdi_cmd(void);/*写使能复位*/
 void wrsr_cmd(void);/*复位时间位和数据保护位写入状态寄存器*/
 uchar rdsr_cmd(void);/*读状态寄存器*/
 void byte_write(uchar aa,uint dd);/*字节写入,aa为写入的数据,dd为写入的地址*/
 uchar byte_read(uint dd);/*字节读出,dd为读出的地址,返回读出的数据*/
 void page_write(uchar aa1,uchar aa2,uchar aa3,uchar aa4,uint dd);/*页写入*/
 void sequ_read(void);/*连续读出*/
 void rst_wdog(void);/*DOG复位*/
 void outbyt(uchar aa);/*输出一个字节到25045中，不包括先导字等*/
 uchar inputbyt();/*由25045输入一个字节，不包括先导字等额外的东西*/
 void wip_poll(void);/*检查写入过程是否结束*/
 
 
/*25045操作子程序集*/
/*;*******************************************************
*
;* Name: WREN_CMD
;* Description: Set write enable latch
;* Function: This routine sends the command to enable writes to the EEPROM memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;*****************************************************
*/
/*写使能子程序*/
void wren_cmd(void)
{
 uchar aa;
 SCK=0;/* Bring SCK low */
 CS=0;/* Bring /CS low */
 aa=WREN_INST;
 outbyt(aa);/* Send WREN instruction */
 SCK=0;/* Bring SCK low */
 CS=1;/* Bring /CS high */
}

/*;***********************************************************
*
;* Name: WRDI_CMD
;* Description: Reset write enable latch
;* Function: This routine sends the command to disable writes to the EEPROM memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;***********************************************************
*/
/*写使能复位子程序*/
void wrdi_cmd(void)
{
 uchar aa;
 SCK=0;/* Bring SCK low */
 CS=0;/* Bring /CS low */
 aa=WRDI_INST;
 outbyt(aa);/* Send WRDI instruction */
 SCK=0;/* Bring SCK low */
 CS=1;/* Bring /CS high */
}

/*;********************************************************
*
;* Name: WRSR_CMD
;* Description: Write Status Register
;* Function: This routine sends the command to write the WD0, WD1, BP0 and BP0 EEPROM
;* bits in the status register
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A
;********************************************
*/
/*写状态寄存器子程序*/
void wrsr_cmd(void)
{
 uchar aa;
 SCK=0;/* Bring SCK low */
 CS=0;/* Bring /CS low */
 aa=WRSR_INST;
 outbyt(aa) ;/* Send WRSR instruction */
 aa=STATUS_REG;
 outbyt(aa);/* Send status register */
 SCK=0;/* Bring SCK low */
 CS=1;/* Bring /CS high */
 wip_poll();/* Poll for completion of write cycle */
}

/*;*************************************************************
*
;* Name: RDSR_CMD
;* Description: Read Status Register
;* Function: This routine sends the command to read the status register
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = status registerXicor Application Note AN21
;* Register Usage: A
;*******************************************************
*/
/*读状态寄存器,读出的数据放入到aa中*/
uchar rdsr_cmd (void)
{
 uchar aa;
 SCK=0;
 CS=0;
 aa=RDSR_INST;
 outbyt(aa);
 aa=inputbyt();
 SCK=0;
 CS=1;
 return aa;
}