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#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit din=P3^0; //引腳定義
sbit clk=P3^1;
sbit sck=P3^2;
sbit SDA=P3^3;
sbit SCL=P3^4;
sbit set=P3^5;
bit ack; //應答位
#define DS3231_WriteAddress 0xD0//器件寫地址
#define DS3231_ReadAddress 0xD1//器件讀地址
#define DS3231_SECOND 0x00//秒
#define DS3231_MINUTE 0x01//分
#define DS3231_HOUR 0x02//時
#define DS3231_WEEK 0x03//星期
#define DS3231_DAY 0x04//日
#define DS3231_MONTH 0x05//月
#define DS3231_YEAR 0x06//年
//#define bcd_hex(bcd) ((((uchar)bcd) & 0xF0) >> 4) * 10 + (((uchar)bcd) & 0x0F) //8421碼轉16進制
//uchar bcd_hex(uchar bcd){return((bcd/16*10)+(bcd&0x0f));}
//#define hex_bcd(hex) (((u8)hex) % 10) + ((((u8)hex) /10) << 4)//16進制轉8421碼
void delayus(uint us) {while(--us);}
void Start_I2C(void){SDA=1;delayus(1);SCL=1;delayus(5);SDA=0;delayus(5);SCL=0;delayus(2);} //I2C開始
void Stop_I2C(void) {SDA=0;delayus(1);SCL=1;delayus(5);SDA=1;delayus(5);} //I2C停止
void SendByte_595(uchar date); //74hc595發送字節時序
void SendByte_3231(uchar date); //ds3231發送字節時序
uchar write_byte_3231(uchar addr,uchar write_date);//指定地址寫入字節
uchar RcvdByte_3231(void); //ds3231接收字節時序
void Ack_3231(bit a); // 發送應答與否
uchar read_current(void);
uchar read_random(uchar random_addr);
// uchar date[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
code uchar code_led[]={
0x40, // 0
0x79, // 1
0x24, // 2
0x30, // 3
0x19, // 4
0x12, // 5
0x02, // 6
0x78, // 7
0x00, // 8
0x10, // 9
0x08, // A
0x03, // B
0x46, // C
0x21, // D
0x06, // E
0x0E // F
//0x00
};
void main()
{
uint d=0;//點閃計時
uchar i;
uchar miao,fen,shi,ri,yue,nian;
uchar w[4];
//uchar n=20,y=10,r=3,s=14,f=16,m=31;//調整時間用
while(1){
////////////////////////////
d=d+1;
if(d%1000==0)
{
if(miao!=read_random(DS3231_SECOND))
{
d=0;
miao =read_random(DS3231_SECOND);
fen =read_random(DS3231_MINUTE);
shi =read_random(DS3231_HOUR);
ri =read_random(DS3231_DAY);
yue =read_random(DS3231_MONTH);
nian =read_random(DS3231_YEAR);
w[0]=code_led[shi/16];w[1]=code_led[shi%16];
w[2]=code_led[fen/16];w[3]=code_led[fen%16];
// w[0]=code_led[fen/16];w[1]=code_led[fen%16];
// w[2]=code_led[miao/16];w[3]=code_led[miao%16];
for (i=0; i<4; i++) SendByte_595(w[i]); sck=0;delayus(5);sck=1;delayus(5);
}
}
if(d==26000)
{
w[1]=code_led[shi%16]^0x80;
w[2]=code_led[fen/16]^0x80;
// w[0]=code_led[fen/16];w[1]=code_led[fen%16]^0x80;
// w[2]=code_led[miao/16]^0x80;w[3]=code_led[miao%16];
for (i=0; i<4; i++) SendByte_595(w[i]); sck=0;delayus(5);sck=1;delayus(5);
}
/////////////////////////////////////
while(set==0)
{
w[0]=code_led[yue/16];w[1]=code_led[yue%16];
w[2]=code_led[ri/16]^0x80;w[3]=code_led[ri%16];
for (i=0; i<4; i++) SendByte_595(w[i]); sck=0;delayus(5);sck=1;delayus(5);
// write_byte_3231(DS3231_SECOND,m/10*16+m%10);
// write_byte_3231(DS3231_MINUTE,f/10*16+f%10);
// write_byte_3231(DS3231_HOUR,s/10*16+s%10);
// write_byte_3231(DS3231_DAY,r/10*16+r%10);
// write_byte_3231(DS3231_MONTH,y/10*16+y%10);
// write_byte_3231(DS3231_YEAR,n/10*16+n%10);
}
}
}
void SendByte_595(uchar date){uchar i;for(i=0;i<8;i++){clk=0;delayus(2);date<<=1;din=CY;delayus(5);clk=1;delayus(5);}}//595移位輸出
void SendByte_3231(uchar date) //發送一個字節
{
uchar i;
for (i=0;i<8;i++){date<<=1;SDA=CY;delayus(1);SCL=1;delayus(5);SCL=0;}
delayus(2);SDA=1;delayus(2);SCL=1;delayus(3);//釋放SDA 準備接收應答信號
if(SDA==1)ack=0;else ack=1; //檢測應答信號
SCL=0; delayus(2);
}
uchar RcvdByte_3231(void)//讀取一個字節的數據
{
uchar i;
uchar date=0;
SDA=1;
for(i=0;i<8;i++)
{
delayus(1);
SCL=0;delayus(5); SCL=1;delayus(3);
date=date<<1;
if(SDA==1)date+=1; delayus(2);
}
SCL=0;
delayus(2);
return(date);
}
void Ack_3231(bit a){if(a==0)SDA=0;else SDA=1; delayus(3);SCL=1;delayus(5);SCL=0;delayus(2);} //發送應答與否
// uchar write_byte_3231(uchar addr,uchar write_date)
// {
// Start_I2C();
// SendByte_3231(DS3231_WriteAddress);//呼叫ds3231傳送
// if(ack==0)return 0;
// SendByte_3231(addr);//送地址
// if(ack==0)return 0;// 無應答退出
// SendByte_3231(write_date);//送數據
// if(ack==0)return 0;// 無應答退出
// Stop_I2C();
// delayus(10);
// return 1;// 發送成功
// }
uchar read_current(void)
{
uchar read_date;
Start_I2C();
SendByte_3231(DS3231_ReadAddress);
if(ack==0)return 0;// 無應答退出
read_date=RcvdByte_3231();
Ack_3231(1);//接收到一個字節數據后非應答
Stop_I2C();
return read_date;
}
uchar read_random(uchar random_addr)
{
Start_I2C();
SendByte_3231(DS3231_WriteAddress);//呼叫ds3231傳送
if(ack==0)return 0;// 無應答退出
SendByte_3231(random_addr);
if(ack==0)return 0;// 無應答退出
return (read_current());
}

復制代碼