25045操作標準子程序
# include <stdio.h>
# include <reg52.h>
# define uchar unsigned char
# define uint unsigned int
sbit SO=P1^1;/*25045輸出*/
sbit SI=P1^2;/*25045輸入*/
sbit SCK=P1^3;/*25045時鐘*/
sbit CS=P1^4;/*25045片選*/
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)*/
/*寫入25045的先導(dǎo)字,應(yīng)當(dāng)為0000A010,其中的A為寫入25045的高位地址
將此WRITE_INST和寫入高位地址相或后即為正確的寫先導(dǎo)字*/
uchar code READ_INST=0X03;
/* Read memory instruction (READ)*/
/*讀出25045的先導(dǎo)字,應(yīng)當(dāng)為0000A011,其中的A為讀出25045的高位地址
將此READ_INST和讀出高位地址相或后即為正確的讀先導(dǎo)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*/
/*頁面寫入的其始地址*/
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,設(shè)置DOG時間設(shè)置為200毫秒,無寫保護*/
/*這是狀態(tài)寄存器的值,他的意義在于第5,第4位為WDI1,WDI0代表DOG的時間,00為1.4秒,01為600毫秒,10為200毫秒,00為disabled
第3位和第2位為BL1,BL0,是寫保護設(shè)置位,00為無保護,01為保護180-1FF,10為保護100-1FF,11為保護000-1FF.第1位為WEL,
當(dāng)他為1時代表已經(jīng)"寫使能"設(shè)置了,現(xiàn)在可以寫了,只讀位.第0位為WIP,當(dāng)他為1時代表正在進行寫操作,是只讀*/
uchar code MAX_POLL=0x99;
/* Maximum number of polls*/
/*最大寫過程時間,確定25045的最大的寫入過程的時間*/
uchar code INIT_STATE=0x09;
/* Initialization value for control ports*/
uint code SLIC=0x30;
/* Address location of SLIC*/
void wren_cmd(void);/*寫使能子程序*/
void wrdi_cmd(void);/*寫使能復(fù)位*/
void wrsr_cmd(void);/*復(fù)位時間位和數(shù)據(jù)保護位寫入狀態(tài)寄存器*/
uchar rdsr_cmd(void);/*讀狀態(tài)寄存器*/
void byte_write(uchar aa,uint dd);/*字節(jié)寫入,aa為寫入的數(shù)據(jù),dd為寫入的地址*/
uchar byte_read(uint dd);/*字節(jié)讀出,dd為讀出的地址,返回讀出的數(shù)據(jù)*/
void page_write(uchar aa1,uchar aa2,uchar aa3,uchar aa4,uint dd);/*頁寫入*/
void sequ_read(void);/*連續(xù)讀出*/
void rst_wdog(void);/*DOG復(fù)位*/
void outbyt(uchar aa);/*輸出一個字節(jié)到25045中，不包括先導(dǎo)字等*/
uchar inputbyt();/*由25045輸入一個字節(jié)，不包括先導(dǎo)字等額外的東西*/
void wip_poll(void);/*檢查寫入過程是否結(jié)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
;*****************************************************
*/
/*寫使能子程序*/
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
;***********************************************************
*/
/*寫使能復(fù)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
;********************************************
*/
/*寫狀態(tài)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
;*******************************************************
*/
/*讀狀態(tài)寄存器,讀出的數(shù)據(jù)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;
}
*
;* Name: BYTE_WRITE
;* Description: Single Byte Write
;* Function: This routine sends the command to write a single byte to the EEPROM memory
array
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;**********************************************************
*/[!--empirenews.page--]
/*字節(jié)寫入,aa為寫入的數(shù)據(jù),dd為寫入的地址,對于25045而言為000-1FF*/
void byte_write(aa,dd)
uchar aa;
uint dd;
{
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|WRITE_INST);/* Send WRITE instruction including MSB of address */
/*將高位地址左移3位與寫入先導(dǎo)字相或,得到正確的先導(dǎo)字寫入25045*/
outbyt((uchar)(dd));
/*輸出低位地址到25045*/
outbyt(aa);
/*寫入數(shù)據(jù)到25045的對應(yīng)單元*/
SCK=0;
CS=1;
wip_poll();
/*檢測是否寫完*/
}
*
;* Name: BYTE_READ
;* Description: Single Byte Read
;* Function: This routine sends the command to read a single byte from the EEPROM memory
array
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = read byte
;* Register Usage: A, BXicor Application Note AN21
;********************************************************
*/
/*字節(jié)讀出,其中dd為讀出的地址,返回的值為讀出的數(shù)據(jù)*/
uchar byte_read(dd)
uint dd;
{
uchar cc;
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|READ_INST);/* Send READ_INST instruction including MSB of address */
/*將高位地址左移3位與讀出先導(dǎo)字相或,得到正確的先導(dǎo)字寫入25045*/
outbyt((uchar)(dd));
/*輸出低位地址到25045*/
cc=inputbyt();/*得到讀出的數(shù)據(jù)*/
SCK=0;
CS=1;
return cc;
}
/*;**********************************************
*
;* Name: PAGE_WRITE
;* Description: Page Write
;* Function: This routine sends the command to write three consecutive bytes to the EEPROM
;* memory array using page mode
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;*****************************************************
*/
/*頁面寫入,其中aa1,aa2,aa3,aa4為需要寫入的4個數(shù)據(jù)(最大也就只能一次寫入4個字,dd為寫入的首地址*/
void page_write(aa1,aa2,aa3,aa4,dd)
uchar aa1,aa2,aa3,aa4;
uint dd;
{
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|WRITE_INST);/* Send WRITE instruction including MSB of address */
/*將高位地址左移3位與寫入先導(dǎo)字相或,得到正確的先導(dǎo)字寫入25045*/
outbyt((uchar)(dd));
/*寫入低位地址到25045*/
outbyt(aa1);
/*寫入數(shù)據(jù)1到25045的對應(yīng)單元*/
outbyt(aa2);
/*寫入數(shù)據(jù)2到25045的對應(yīng)單元*/
outbyt(aa3);
/*寫入數(shù)據(jù)3到25045的對應(yīng)單元*/
outbyt(aa4);
/*寫入數(shù)據(jù)4到25045的對應(yīng)單元*/
SCK=0;
CS=1;
wip_poll();
}
/*;********************************************
*
;* Name: SEQU_READ
;* Description: Sequential Read
;* Function: This routine sends the command to read three consecutive bytes from the EEPROM
;* memory array using sequential mode
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = last byte read
;* Register Usage: A, B
;*********************************************************
*/
/*連續(xù)讀出,由于函數(shù)的返回值只能為1個,對于連續(xù)讀出的數(shù)據(jù)只能使用指針作為函數(shù)的返回值才能做到返回一系列的數(shù)組*/
/*sequ_read:*/
unsigned int *page_read(n,dd)
uchar n;/*n是希望讀出的數(shù)據(jù)的個數(shù)，n<=11*/
unsigned int dd;/*dd是讀出數(shù)據(jù)的首地址*/
{
uchar i;
uchar pp[10];
unsigned int *pt=pp;
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|READ_INST);
for (i=0;i<n;i++)
{
pp[i]=inputbyt();
}
return (pt);
}
/*調(diào)用的方法如下*/
/*unsigned int *p;*/
/*p=page_read(4,100);*/
/*a=*(p)*/
/*b=*(p+1)*/
/*c=*(p+2)*/
/*d=*(p+3)*/
/*abcd中存放25045中由100地址開始的4個數(shù)據(jù)*/
/* Send WRITE */
/*mov DPTR, #PAGE_ADDR ; Set address of 1st byte to be read
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #READ_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send READ instruction with MSB of address
mov A, DPL
lcall outbyt ; Send low order address byte
lcall inputbyt ; Read 1st data byte
lcall inputbyt ; Read 2nd data byte
lcall inputbyt ; Read 3rd data byte
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret*/
/*;*******************************************************
*
;* Name: RST_WDOG
;* Description: Reset Watchdog Timer
;* Function: This routine resets the watchdog timer without sending a command
;* Calls: None
;* Input: None
;* Outputs: None
;* Register Usage: None
;***************************************************
*/
/*復(fù)位DOG*/
void rst_wdog (void)
{
CS=0;
CS=1;
}
*
;* Name: WIP_POLL
;* Description: Write-In-Progress Polling
;* Function: This routine polls for completion of a nonvolatile write cycle by examining the
;* WIP bit of the status register
;* Calls: rdsr_cmdXicor Application Note AN21
;* Input: None
;* Outputs: None
;* Register Usage: R1, A
;**************************************************
*/
/*檢測寫入的過程是否結(jié)束*/
void wip_poll(void)
{
uchar aa;
uchar idata my_flag;
for (aa=1;aa>MAX_POLL;aa++)
{
my_flag=rdsr_cmd();[!--empirenews.page--]
if ((my_flag&&0x01)==0) {aa=MAX_POLL;}/*判斷是否WIP=0,即判斷是否寫入過程已經(jīng)結(jié)束,若結(jié)束就跳出,否則繼續(xù)等待直到達到最大記數(shù)值*/
}
}
/*;*******************************************************
*
;* Name: OUTBYT
;* Description: Sends byte to EEPROM
;* Function: This routine shifts out a byte, starting with the MSB, to the EEPROM
;* Calls: None
;* Input: A = byte to be sent
;* Outputs: None
;* Register Usage: R0, A
;**********************************************************
*/
/*輸出一個數(shù)據(jù)到25045,此數(shù)據(jù)可能為地址,先導(dǎo)字,寫入的數(shù)據(jù)等*/
void outbyt(aa)
uchar aa;
{
uchar my_flag1,i;
for (i=0;i>7;i++)
{
my_flag1=aa;
SCK=0;
SI=(my_flag1>>i);
SCK=1;
}
SI=0;/*使SI處于確定的狀態(tài)*/
}
/*;***************************************************
*
;* Name: INPUTBYT
;* Description: Recieves byte from EEPROM
;* Function: This routine recieves a byte, MSB first, from the EEPROM
;* Calls: None
;* Input: None
;* Outputs: A = recieved byte
;* Register Usage: R0, A
;*******************************************************
*/
/*得到一個數(shù)據(jù),此數(shù)據(jù)可能為狀態(tài)寄存器數(shù)據(jù),讀出的單元數(shù)據(jù)等*/
uchar inputbyt(void)
{
uchar aa,my_flag;
char i;
for (i=7;i<0;i--)
{
SCK=0;
my_flag=(uchar)(SO);
SCK=1;
aa=(aa||(my_flag<<i));
my_flag=0x00;
}
return aa;
}
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