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標題: stc89c52單片機eeprom問題 [打印本頁]

作者: whuwuh666 時間: 2020-8-19 17:13
標題: stc89c52單片機eeprom問題
近期制作了一個計數器，想增加eeprom來掉電存儲。但是發現數碼管數字增加一次就不再增加（從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;//霍爾傳感器
sbit nnn=P1^7;//小數點dp控制位
unsigned long jishu=4294967295;
double meterd;
unsigned long meter;//在此以上是原來的，無誤
/*eeprom（這些是復制的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//這里已經改成89c52的eeprom地址

/*MCU初始設置（開中斷）*/
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--);
}
/*顯示*/
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;//個位
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（和原來一樣）*/
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//這里面改了
{
delayms(50);
if(key==0)
{
jishu=IapReadByte(IAP_ADDRESS);
jishu++;
IapProgramByte(IAP_ADDRESS,jishu);
}
}

作者: wulin 時間: 2020-8-19 21:10
stc單片機的eeprom哪怕只寫1個字節也得先把整個扇區擦除才能正常寫入。如果只改寫某一個或多個字節就得把有效地址的數據全部讀出來保存，改變其中一個或多個數據后再將整個扇區擦除，把改變后的和原樣的數據一道按原地址寫回去。
void Int0() interrupt 0
{
delayms(50);
if(key==0)
{
jishu=IapReadByte(IAP_ADDRESS);
jishu++;
IapEraseSector(IAP_ADDRESS);//擦除扇區
IapProgramByte(IAP_ADDRESS,jishu);
}
}

作者: lmn2005 時間: 2020-8-20 07:58

wulin 發表于 2020-8-19 21:10
stc單片機的eeprom哪怕只寫1個字節也得先把整個扇區擦除才能正常寫入。如果只改寫某一個或多個字節就得把有 ...

沒錯，讀寫STC內部eeprom麻煩變麻煩在這里

作者: wulin 時間: 2020-8-20 10:05

新新科技發表于 2020-8-20 07:58
沒錯，讀寫STC內部eeprom麻煩變麻煩在這里

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

作者: whuwuh666 時間: 2020-8-21 13:24
謝謝大家的幫助。問題現在已經解決了,一個是大家所說的問題.需要先把整個扇區給擦掉才能寫。第二點是對eeprom操作時候要關掉系統的總中斷，我的程序是在中斷里邊兒直接就把中斷給關了，還沒有寫入進去，中斷就跳出。

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