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Hi , The following code works fine while reading the contents from the EEPROM (24C04) but does not continuously writes to EEPROM. Please suggest the correction in this code. #include <REG52.H> #include <stdio.h> #include <intrins.h> sbit SDA = P2^0; sbit SCL = P2^1; #define uchar unsigned char #define uint unsigned int #define Byte unsigned char #define Word unsigned int #define bool bit #define true 1 #define false 0 #define SomeNOP(); _nop_();_nop_();_nop_();_nop_(); void I2CStart(void); void I2CStop(void); void WaitAck(void); void SendAck(void); void SendNotAck(void); void I2CSendByte(Byte); Byte I2CReceiveByte(void); void contr(uchar); void contw(uchar,uchar); void main(void) { unsigned char count=0; PCON |= 0x80; // Set bit 7 of the PCON register (SMOD = 1) SCON = 0x50; // 0101,0000 (Mode 1 and RxD enable) TMOD |= 0x20; // Timer #1 in autoreload 8 bit mode TH1 = 0xFA; // Baud rate is determined by // Timer #1 overflow rate TR1 = 1; // Turn on Timer 1 TI = 1; contw(0,'P'); contw(1,'O'); while(1) { if(count==5) count=0; contr(count++); } } /**-------------------------------------------------------------------------------- void I2CStart(void) I2C ---------------------------------------------------------------------------------*/ void I2CStart(void) { SDA=1; SCL=1; SomeNOP();//INI SDA=0; SomeNOP(); //START SCL=0; SomeNOP(); } /**-------------------------------------------------------------------------------- void I2CStop(void) I2C ---------------------------------------------------------------------------------*/ void I2CStop(void) { SCL=0; SDA=0; SomeNOP(); //INI SCL=1; SomeNOP(); SDA=1; //STOP SomeNOP(); } /**-------------------------------------------------------------------------------- bit I2CAck(void) I2C ----------------------------------------------------------------------------------*/ void WaitAck(void) { SDA=1; SomeNOP(); SCL=1; while(SDA) SomeNOP(); SCL=0; SomeNOP(); } /**-------------------------------------------------------------------------------- void SendAck(void) I2C ---------------------------------------------------------------------------------*/ void SendAck(void) { SDA=0; SomeNOP(); SCL=1; SomeNOP(); SCL=0; } /**-------------------------------------------------------------------------------- void SendNotAck(void) I2C **--------------------------------------------------------------------------------*/ void SendNotAck(void) { SDA=1; SomeNOP(); SCL=1; SomeNOP(); SCL=0; } /**-------------------------------------------------------------------------------- void I2CSend(uchar ch) I2C ---------------------------------------------------------------------------------*/ void I2CSendByte(Byte ch) { uchar i=8; while (i--) { SCL=0; _nop_(); SDA=(bit)(ch&0x80); ch<<=1; SomeNOP(); SCL=1; SomeNOP(); } SCL=0; } /**-------------------------------------------------------------------------------- uchar I2CReceive(void) I2C ---------------------------------------------------------------------------------*/ Byte I2CReceiveByte(void) { uchar i=8; Byte ddata=0; SDA=1; while (i--) { ddata<<=1; SCL=0; SomeNOP(); SCL=1; SomeNOP(); ddata|=SDA; } SCL=0; return ddata; } /**-------------------------------------------------------------------------------- void contr(uchar) I2C Content Read ---------------------------------------------------------------------------------*/ void contr(uchar loc) { char i; I2CStart(); I2CSendByte(0xA2); WaitAck(); I2CSendByte(loc); WaitAck(); I2CStop(); I2CStart(); I2CSendByte(0xA3); WaitAck(); printf("%c",I2CReceiveByte()); SendNotAck(); I2CStop(); } /**-------------------------------------------------------------------------------- void contw(uchar,uchar) I2C Content Write *Error in function* ---------------------------------------------------------------------------------*/ void contw(uchar loc,uchar info) { I2CStart(); I2CSendByte(0xA2); WaitAck(); I2CSendByte(loc); WaitAck(); I2CSendByte(info); WaitAck(); I2CStop(); }
//24c01-24c16读写驱动程序， sbit a0=ACC^0; //定义ACC的位，利用ACC操作速度最快 sbit a1=ACC^1; sbit a2=ACC^2; sbit a3=ACC^3; sbit a4=ACC^4; sbit a5=ACC^5; sbit a6=ACC^6; sbit a7=ACC^7; void s24(void) { _nop_();scl=0;sda=1;scl=1;_nop_();sda=0;_nop_();scl=0; } void s240(void) { _nop_();scl0=0;sda0=1;scl0=1;_nop_();sda0=0;_nop_();scl0=0; } void p24(void) { sda=0;scl=1;_nop_();sda=1; } void p240(void) { sda0=0;scl0=1;_nop_();sda0=1; } unsigned char rd24(void) { sda=1; scl=1;a7=sda;scl=0; scl=1;a6=sda;scl=0; scl=1;a5=sda;scl=0; scl=1;a4=sda;scl=0; scl=1;a3=sda;scl=0; scl=1;a2=sda;scl=0; scl=1;a1=sda;scl=0; scl=1;a0=sda;scl=0; sda=1;scl=1;scl=0; return(ACC); } void wd24(unsigned char dd) { ACC=dd; sda=a7;scl=1;scl=0; sda=a6;scl=1;scl=0; sda=a5;scl=1;scl=0; sda=a4;scl=1;scl=0; sda=a3;scl=1;scl=0; sda=a2;scl=1;scl=0; sda=a1;scl=1;scl=0; sda=a0;scl=1;scl=0; sda=1;scl=1; } unsigned char read(unsigned int address){ unsigned char dd; dd=((address&0x7ff)/256)<<1; s24();wd24(0xa0|dd);scl=0;wd24(address);scl=0; s24();wd24(0xa1|dd);scl=0;dd=rd24();p24();return(dd); } void write(unsigned int address,unsigned char dd){ unsigned char ddd; ddd=((address&0x7ff)/256)<<1; s24();wd24(0xa0|ddd);scl=0;wd24(address);scl=0;wd24(dd);scl=0;p24(); time=0; //time为定时器时间参考，time增加1代表1ms,如果没有用定时器，取消该行 while (1) { s24(); wd24(0xa0|ddd); sda=1; if (sda==0) break; if (time>10) break; //此行防止由于eeprom器件损坏后的死循环 scl=0; } }