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;
}
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