eePROM.rar_eeprom

#include<stdio.h> #include<reg51.h> #define PCF8583W 0xA0 #define PCF8583R 0xA1 #define lcd_dta P0 sbit RS = P0^0; sbit RW = P0^1; sbit EN = P0^2; sbit lcdBL = P0^3; sbit RTCSCL=P1^0; sbit RTCSDA=P1^1; unsigned int i1,i2; unsigned char SECS; unsigned char MINS; unsigned char idata HRS _at_ 0X3B; unsigned char idata YDATE _at_ 0X3C; unsigned char idata DMONTH _at_ 0X3D; unsigned char idata lastread _at_ 0x3E; unsigned char idata tp _at_ 0x3F; unsigned char data1; unsigned char xbyte[]=" "; /***************A short Delay Function for the LCD delay timimgs****************/ void shortdelay() { for(i1=0;i1<4;i1++) { } } /**************A long delay function for the Processor reset to LCD reset Timing***************/ void longdelay() { for (i1=0;i1<44;i1++) { for(i2=0;i2<0xFF;i2++) { } } } /************** LCD Command Write Function*****************************************************/ void write_command() { RW = 0; RS = 0; EN = 1; B = ACC; ACC= ACC & 0XF0; ACC = ACC | 0x0C; P0 = ACC; shortdelay(); EN = 0; shortdelay(); EN = 1; ACC = B; ACC = ACC & 0X0F; ACC = ACC<<4; ACC = ACC | 0x0C; P0 = ACC; shortdelay(); EN = 0; longdelay(); } /************** LCD Data Write Function*****************************************************/ void write_data() { RW = 0; RS = 1; EN=1; B = ACC; ACC = ACC & 0XF0; ACC = ACC | 0x0D; P0 = ACC; shortdelay(); EN = 0; shortdelay(); EN = 1; ACC = B; ACC = ACC & 0X0F; ACC = ACC<<4; ACC = ACC | 0x0D; P0 = ACC; shortdelay(); EN=0; longdelay(); } /********************** LCD Initialization Functions*********************************/ void init_lcd() { lcdBL = 1; ACC = 0X28; write_command(); ACC = 0X0C; write_command(); ACC = 0X06; write_command(); ACC = 0x01; write_command(); } void initialise() { longdelay(); longdelay(); longdelay(); longdelay(); init_lcd(); P0 = 0xFF; P0 = 0x08; init_lcd(); longdelay(); } /************** BCD to HEX code conversion ****************/ void bcd_to_hex(unsigned mybyte) { unsigned char x,y; x=mybyte&0x0F; x=x|0x30; y=mybyte&0xF0; y=y>>4; y=y|0x30; } void sclhigh() { hg: RTCSCL=1; if (RTCSCL!=1) { goto hg; } } void delay() { int m; for (m=0;m<9;m++ ) { } } void init_ser() { TI=0; RI=0; TMOD=0X20; TH1=0X0FD; SCON=0X50; EA =1; ET0 =1; TR1 =1; } /**********RTC start***************************/ void start() { RTCSDA = 1; sclhigh(); RTCSDA=0; delay(); RTCSCL = 0; } /**********RTC stop*****************************/ void stop() { RTCSDA=0; sclhigh(); RTCSDA=1; } /******************RTC writing byte**************/ void sendbyte() { unsigned int data2; int i; for (i=0;i<8;i++ ) { data2 = (data1 & 0x80); if (data2 == 0x80) { RTCSDA = 1; } else { RTCSDA = 0; } sclhigh(); data1=data1<<1; RTCSCL=0; } RTCSDA = 1; sclhigh(); if (RTCSDA != 1) { goto sb; } else { goto sa; } sa: sb: delay(); RTCSCL=0; delay(); } /*******************RTC Reading byte*****************/ void readbyte() { unsigned int data7,data8; int j; RTCSDA=1; for (j=0;j<8 ;j++) { sclhigh(); tp=RTCSDA; if (tp==1) { data7=(data8 | 0x01); } else { data7=(data8 & 0xfe); } data8=data7<<1; RTCSCL=0; delay(); delay(); delay(); } if(lastread==1) { goto ack1; } RTCSDA=0; ack1: sclhigh(); RTCSCL=0; ACC=data7; } /*************************READ CLOCK***********************/ void rd_clock() { lastread = 0; //before read byte set the lastread=0 start(); data1=PCF8583W; //WRITE sendbyte(); data1=0x01; sendbyte(); stop(); start(); data1=PCF8583R; //READ// sendbyte(); lastread = 1; readbyte(); MINS = ACC; stop(); } /*readbyte(); MINS = ACC; readbyte(); HRS = ACC; readbyte(); YDATE = ACC; lastread = 1; //before the lastread byte,set the lastread=1 readbyte(); DMONTH = ACC; stop(); } /********************** SET CLOCK ********************/ void set_clock() { start(); data1 = PCF8583W; sendbyte(); data1 = 0X01; sendbyte(); data1 = SECS; sendbyte(); /*data1 = MINS; sendbyte(); data1 = HRS; sendbyte(); data1 = YDATE; sendbyte(); data1 = DMONTH; sendbyte();*/ stop(); } void send (unsigned char dat1) { SBUF = dat1; while(!TI); TI=0; } void send_data(unsigned char data3) { unsigned char R; R = data3 & 0xF0; R = R >> 4; R = R + 0x30; send (R); R = data3 & 0x0F; R = R + 0x30; send (R); } void main() { init_ser(); SECS = 0x20; set_clock(); while(1) { rd_clock(); send_data(MINS); } }