PIC microcontroller (PIC16F877A) DS1302 chip Program

# Include <pic. h> typedef unsigned char uchar; typedef unsigned int uint; # define rs_h PORTC | = 0x01 # define rs_l PORTC & = 0xfe # define rw_h PORTC | = 0x02 # define rw_l PORTC & = 0xfd # define en_h PORTC | = 0x04 # define en_l PORTC & = 0xfb # define rst_h PORTC | = 0x08 # define rst_l PORTC & = 0xf7 # define sck_h PORTC | = 0x10 # define sck_l PORTC & = 0xef # define io_h PORTC | = 0x20 # define io_l PORTC & = 0xdf # define SECADD 0X80/S Register address # define MINADD 0x82 # define HRADD 0x84 # define DATEADD 0x86 # define MONTHADD 0x88 # define DAYADD 0x8a # define YEARADD 0x8c # define CONTROLADD 0x8e # define PORT (PORTB) void delayms (uint x); void LCD _com (uchar com); void LCD _dat (uchar dat); void LCD _write (uchar c, uchar r, uchar dat); void LCD _init (void ); void Ds1302Init (void); void WriteByte (uchar dat); uchar ReadByte (void); uchar BCDtoDex (uchar dat); uchar DextoBCD (uchar dat); uchar ReadByte (void ); void Ds1302Write (uchar add, uchar dat); uchar Ds1302Read (uchar add); void main (void) {uchar sec, min, hr, date, month, day, year; TRISB = 0x00; TRISC & = 0xc0; LCD _init (); Ds1302Init (); while (1) {sec = Ds1302Read (SECADD); min = Ds1302Read (MINADD ); hr = Ds1302Read (HRADD); date = Ds1302Read (DATEADD); month = Ds1302Read (MONTHADD); day = Ds1302Read (DAYADD); year = Ds1302Read (YEARADD ); sec = BCDtoDex (sec); min = BCDtoDex (min); hr = BCDtoDex (hr); date = BCDtoDex (date); month = BCDtoDex (month ); day = BCDtoDex (day); year = BCDtoDex (year); LCD _write (, 0x32); LCD _write (, 0x30); LCD _write, 0x30 + year/10); LCD _write (, 0x30 + year % 10); LCD _write (, 0x30 + month/10); LCD _write, 0x30 + month % 10); LCD _write (, 0x30 + date/10); LCD _write (, 0x30 + date % 10); LCD _write, 0x30 + day); LCD _write (, 0x30 + hr/10); LCD _write (, 0x30 + hr % 10); LCD _write, 0x30 + min/10); LCD _write (, 0x30 + min % 10); LCD _write (, 0x30 + sec/10); LCD _write (, 11, 0x30 + sec % 10); delayms (1005); // 1 ms} void Ds1302Init (void) {rst_l; sck_l; Ds1302Write (CONTROLADD, 0 ); // disable write protection Ds1302Write (MINADD, DextoBCD (06); Ds1302Write (HRADD, DextoBCD (19); Ds1302Write (DATEADD, DextoBCD (20); Ds1302Write (MONTHADD, dextoBCD (5); Ds1302Write (DAYADD, DextoBCD (7); Ds1302Write (YEARADD, DextoBCD (12); Ds1302Write (SECADD, DextoBCD (30 )); // write the second and start the clock at the same time} void WriteByte (uchar dat) // output the rising edge {uchar I; TRISC & = 0xdf; for (I = 8; I> 0; I --) {sck_l; // if (dat & 0x01) io_h; elseio_l; sck_h; dat >>=1 ;}} uchar BCDtoDex (uchar dat) // convert the BCD code to the decimal {uchar I; I = dat/16; dat % = 16; I = I * 10 + dat; return I ;} uchar DextoBCD (uchar dat) // convert the code to BCD in decimal format {uchar I; I = dat/10; dat % = 10; I = I * 16 + dat; return I ;} uchar ReadByte (void) // the output of the descent edge {uchar I; uchar dat; TRISC | = 0x20; for (I = 8; I> 0; I --) // consider the status after writing. The first time you enter this loop, there is a descent edge {dat >>= 1; sck_l; if (PORTC & 0x20) dat | = 0x80; sck_h;} return dat;} void Ds1302Write (uchar add, uchar dat) {rst_l; sck_l; rst_h; WriteByte (add ); // The lowest position 0 indicates WriteByte (dat); rst_l;} uchar Ds1302Read (uchar add) {uchar dat; rst_l; sck_l; rst_h; WriteByte (add + 1 ); // The lowest address position 1 indicates read dat = ReadByte (); rst_l; return dat;} void delayms (uint x) // 1 ms {uint y, z; for (y = x; y> 0; y --) for (z = 220; z> 0; z --);} void LCD _init (void) // LCD1602 initialization {LCD _com (0x38); LCD _com (0x0c); LCD _com (0x06); LCD _write (, 0xb0); LCD _write (, 0xb0 ); LCD _write (, 0x3a); LCD _write (, 0x3a);} void LCD _com (uchar com) // write the command {rs_l; rw_l; PORT = com to LCD1602; delayms (1); en_h; delayms (1); en_l;} void LCD _dat (uchar dat) // write data to LCD1602 {rs_h; rw_l; PORT = dat; delayms (1); en_h; delayms (1); en_l;} void LCD _write (uchar c, uchar r, uchar dat) // specify rows, columns, and write data to LCD1602 {LCD _com (0x80 + 0x40 * c + r); LCD _dat (dat); delayms (1 );}