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/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC89-90xx Series MCU ISP/IAP/EEPROM Demo -------------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* If you want to use the program or the program referenced in the */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
/*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 0x80 //if SYSCLK<40MHz
#define ENABLE_IAP 0x81 //if SYSCLK<20MHz
//#define ENABLE_IAP x82 //if SYSCLK<10MHz
//#define ENABLE_IAP 0x83 //if SYSCLK<5MHz
//Start address for STC89C58xx EEPROM
//#define IAP_ADDRESS 0x08000
#define IAP_ADDRESS 0x02000 //宏定義EEPROM起始地址
void Delay(BYTE n);
void IapIdle();//關閉IAP
BYTE IapReadByte(WORD addr);//IAP讀字節
void IapProgramByte(WORD addr, BYTE dat);//寫字節
void IapEraseSector(WORD addr);//扇區擦除
void main()
{
WORD i;
P1 = 0xfe; //1111,1110 System Reset OK
Delay(10); //Delay
IapEraseSector(IAP_ADDRESS); //Erase current sector//IAP_ADDRESS扇區擦除
for (i=0; i<512; i++) //Check whether all sector data is FF
{
if (IapReadByte(IAP_ADDRESS+i) != 0xff)//讀IAP_ADDRESS+i是否=0xff
goto Error; //If error, break（ goto Error;無條件跳轉語句）
}
P1 = 0xfc; //1111,1100 Erase successful
Delay(10); //Delay
for (i=0; i<512; i++) //Program 512 bytes data into data flash
{
IapProgramByte(IAP_ADDRESS+i, (BYTE)i);//寫IAP_ADDRESS扇區數據
}
P1 = 0xf8; //1111,1000 Program successful
Delay(10); //Delay
for (i=0; i<512; i++) //Verify 512 bytes data
{
if (IapReadByte(IAP_ADDRESS+i) != (BYTE)i)//讀IAP_ADDRESS扇區數據
goto Error; //If error, break
}
P1 = 0xf0; //1111,0000 Verify successful
while (1);
Error:
P1 &= 0x7f; //0xxx,xxxx IAP operation fail
while (1);
}
/*----------------------------
Software delay function
----------------------------*/
void Delay(BYTE n)
{
WORD x;
while (n--)
{
x = 0;
while (++x);
}
}
/*----------------------------
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
----------------------------*/
BYTE IapReadByte(WORD addr)
{
BYTE 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(WORD addr, BYTE 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(WORD 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();
}

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