stc89c52单片机eeprom问题 - - Powered by Discuz!

标题: stc89c52单片机eeprom问题 [打印本页]

作者: whuwuh666 时间: 2020-8-19 17:13
标题: stc89c52单片机eeprom问题
近期制作了一个计数器，想增加eeprom来掉电存储。但是发现数码管数字增加一次就不再增加（从512跳到2），不知是何故，求指教

#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
float c=2;
uchar duan[]={
 0x3f, /*0*/
 0x06, /*1*/
 0x5b, /*2*/
 0x4f, /*3*/
 0x66, /*4*/
 0x6d, /*5*/
 0x7d, /*6*/
 0x07, /*7*/
 0x7f, /*8*/
 0x6f, /*9*/
 0x00 //ximie
 };
sbit key=P3^2;//霍尔传感器
sbit nnn=P1^7;//小数点dp控制位
unsigned long jishu=4294967295;
double meterd;
unsigned long meter;//在此以上是原来的，无误
/*eeprom（这些是复制的stc示例程序）*/
/*Declare SFR associated with the IAP */
sfr IAP_DATA = 0xE2; //Flash data register
sfr IAP_ADDRH = 0xE3; //Flash address HIGH
sfr IAP_ADDRL = 0xE4; //Flash address LOW
sfr IAP_CMD = 0xE5; //Flash command register
sfr IAP_TRIG = 0xE6; //Flash command trigger
sfr IAP_CONTR = 0xE7; //Flash control register
/*Define ISP/IAP/EEPROM command*/
#define CMD_IDLE 0 //Stand-By
#define CMD_READ 1 //Byte-Read
#define CMD_PROGRAM 2 //Byte-Program
#define CMD_ERASE 3 //Sector-Erase
/*Define ISP/IAP/EEPROM operation const for IAP_CONTR*/
#define ENABLE_IAP 0x81 //if SYSCLK<20MHz
//Start address for STC89C58xx EEPROM
#define IAP_ADDRESS 0x2000//这里已经改成89c52的eeprom地址

/*MCU初始设置（开中断）*/
void init_MCU(void)
{
 EX0=1;
 IT0=1;
 EA=1;
}

/*1ms delay*/
void delayms(uint xms)
{
uint timems;
for(;xms>0;xms--)
 for(timems=115;timems>0;timems--);
}
/*显示*/
void display(uint dat)
{
uchar ge,shi,bai,qian;
ge=dat%1000%100%10;
shi=dat%1000%100/10;
bai=dat%1000/100;
qian=dat/1000;
P2=0XF7;//个位
P1=duan[ge];
delayms(3);
P2=0XFB;//十位
P1=duan[shi];
delayms(3);
P2=0XFD;//百位
P1=duan[bai];
delayms(3);
P2=0XFE;//千位
P1=duan[qian];
delayms(3);
}
/*eeprom（也是示例程序）*/
/*----------------------------
Disable ISP/IAP/EEPROM function
Make MCU in a safe state
----------------------------*/
void IapIdle()
{
IAP_CONTR = 0; //Close IAP function
IAP_CMD = 0; //Clear command to standby
IAP_TRIG = 0; //Clear trigger register
IAP_ADDRH = 0x80; //Data ptr point to non-EEPROM area
IAP_ADDRL = 0; //Clear IAP address to prevent misuse
}
/*----------------------------
Read one byte from ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
Output:Flash data
----------------------------*/
uchar IapReadByte(uint addr)
{
uchar dat; //Data buffer

IAP_CONTR = ENABLE_IAP; //Open IAP function, and set wait time
IAP_CMD = CMD_READ; //Set ISP/IAP/EEPROM READ command
IAP_ADDRL = addr; //Set ISP/IAP/EEPROM address low
IAP_ADDRH = addr >> 8; //Set ISP/IAP/EEPROM address high
IAP_TRIG = 0x46; //Send trigger command1 (0x46)
IAP_TRIG = 0xb9; //Send trigger command2 (0xb9)
_nop_(); //MCU will hold here until ISP/IAP/EEPROM operation complete
dat = IAP_DATA; //Read ISP/IAP/EEPROM data
IapIdle(); //Close ISP/IAP/EEPROM function

return dat; //Return Flash data
}
/*----------------------------
Program one byte to ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
 dat (ISP/IAP/EEPROM data)
Output:-
----------------------------*/
void IapProgramByte(uint addr, uchar dat)
{
IAP_CONTR = ENABLE_IAP; //Open IAP function, and set wait time
IAP_CMD = CMD_PROGRAM; //Set ISP/IAP/EEPROM PROGRAM command
IAP_ADDRL = addr; //Set ISP/IAP/EEPROM address low
IAP_ADDRH = addr >> 8; //Set ISP/IAP/EEPROM address high
IAP_DATA = dat; //Write ISP/IAP/EEPROM data
IAP_TRIG = 0x46; //Send trigger command1 (0x46)
IAP_TRIG = 0xb9; //Send trigger command2 (0xb9)
_nop_(); //MCU will hold here until ISP/IAP/EEPROM operation complete
IapIdle();
}
/*----------------------------
Erase one sector area
Input: addr (ISP/IAP/EEPROM address)
Output:-
----------------------------*/
void IapEraseSector(uint addr)
{
IAP_CONTR = ENABLE_IAP; //Open IAP function, and set wait time
IAP_CMD = CMD_ERASE; //Set ISP/IAP/EEPROM ERASE command
IAP_ADDRL = addr; //Set ISP/IAP/EEPROM address low
IAP_ADDRH = addr >> 8; //Set ISP/IAP/EEPROM address high
IAP_TRIG = 0x46; //Send trigger command1 (0x46)
IAP_TRIG = 0xb9; //Send trigger command2 (0xb9)
_nop_(); //MCU will hold here until ISP/IAP/EEPROM operation complete
IapIdle();
}

/*主程序（和原来一样）*/
void main()
{
uint i;
init_MCU();
while(1)
{
meterd=jishu*c;
meter=meterd;
if (meter<10000)
{
P1=0X00;
P2=0XFE;
nnn=1;
delayms(3);
P2=0XFF;
display (meter);
}
else
{
P1=0X00;
P2=0XFD;
nnn=1;
delayms(3);
P2=0XFF;
display(meter/10);
}
}
}
void Int0() interrupt 0//这里面改了
{
delayms(50);
if(key==0)
{
jishu=IapReadByte(IAP_ADDRESS);
jishu++;
IapProgramByte(IAP_ADDRESS,jishu);
}
}

作者: wulin 时间: 2020-8-19 21:10
stc单片机的eeprom哪怕只写1个字节也得先把整个扇区擦除才能正常写入。如果只改写某一个或多个字节就得把有效地址的数据全部读出来保存，改变其中一个或多个数据后再将整个扇区擦除，把改变后的和原样的数据一道按原地址写回去。
void Int0() interrupt 0
{
delayms(50);
if(key==0)
{
jishu=IapReadByte(IAP_ADDRESS);
jishu++;
IapEraseSector(IAP_ADDRESS);//擦除扇区
IapProgramByte(IAP_ADDRESS,jishu);
}
}

作者: lmn2005 时间: 2020-8-20 07:58

wulin 发表于 2020-8-19 21:10
stc单片机的eeprom哪怕只写1个字节也得先把整个扇区擦除才能正常写入。如果只改写某一个或多个字节就得把有 ...

没错，读写STC内部eeprom麻烦变麻烦在这里

作者: wulin 时间: 2020-8-20 10:05

新新科技发表于 2020-8-20 07:58
没错，读写STC内部eeprom麻烦变麻烦在这里

这是由于硬件材料的物理特性所致，Data Flash只能写0不能写1，只有全部擦除后全部都为1。

作者: whuwuh666 时间: 2020-8-21 13:24
谢谢大家的帮助。问题现在已经解决了,一个是大家所说的问题.需要先把整个扇区给擦掉才能写。第二点是对eeprom操作时候要关掉系统的总中断，我的程序是在中断里边儿直接就把中断给关了，还没有写入进去，中断就跳出。

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