Tweet
Code:
#include <regx51.h>
#define uchar unsigned char
#define pLed0 P3_2
#define pLed1 P3_3
#define pLed2 P3_4
#define pLed3 P3_5
#define DataLed P2
#define SCL P1_0
#define SDA P1_1
#define DSW 0xd0
#define DSR 0xd1
//giao thuc i2c da san sang
//================================================
//cac bien toan cuc
uchar uLed;//chu y la co 4 led thoi
uchar gio,phut,giay,tg;//se duoc cap nhat tai moi khi ham ngat duoc goi
uchar maled[10]={0x21,0x7d,0x13,0x15,0x4d,0x85,0x81,0x3d,0x1,0x5};
//================================================
void init(void);
void T0_ISR(void);
void delay(void);
void i2cstart(void);
void i2cstop(void);
uchar i2cwrite(uchar c);
uchar i2cread(void);
uchar i2creadlast(void);
void scl1(void);
void capnhatgio(void);
void khoitaods(void);//kiem tra xem con ds da duoc chay chua
//neu chua chay thi cho no chay
//==================================================
void main(void)
{
init();
while(1)
{
}
}
void init(void)
{
//khoi tao timer 0 che do tu dong nap lai
//cho phep ngat luon
//uchar c;
SDA=SCL=1;
//bat dau kiem tra con ds
khoitaods();
TMOD=1;
//che do 1 cua bo dinh thoi 0
//cho phep ngat thoi gian
EA=1;//cho phep ngat
ET0=1;//cho phep ngat thoi gian 0
//khoi tao cho t0
TH0=0xd8;
TL0=0xf0;//10.000 us
uLed=0;
TR0=1;
//them phan khoi tao cho 1307
}
void T0_ISR(void) interrupt 1
{
//dau tien la dung bo dinh thoi cai da
TR0=0;
//thuc hien quet led cai da
//kiem tra xem led nao can phuc vu
//cap nhat lai gio, phut, giay
//?????????????????????????????????????????
//?????????????????????????????????????????
capnhatgio();
pLed0=pLed1=pLed2=pLed3=0;
switch(uLed)
{
case 0:
pLed0=1;
//tach chu so
tg=gio>>4;
//tg>>=4;
DataLed=maled[tg];
break;
case 1:
pLed1=1;
tg=gio&0xf;
DataLed=maled[tg];
break;
case 2:
pLed2=1;
tg=phut>>4;
DataLed=maled[tg];
break;
case 3:
pLed3=1;
tg=phut&0xf;
DataLed=maled[tg];
break;
}
++uLed;
if(uLed==4)
uLed=0;
TH0=0xd8;
TL0=0xf0;//10.000 us
TR0=1;
}
void scl1(void)
{
SCL=1;
while(!SCL);
}
void i2cstop(void)
{
SDA=0;
scl1();
SDA=1;
delay();
}
uchar i2cwrite(char c)
{
uchar i,ret;
for(i=0;i<8;++i)
{
//lan luot gui tung bit 1 ra
SDA=0;
if(c&0x80)
SDA=1;
c<<=1;
scl1();
delay();
SCL=0;
delay();
}
ret=0;
//tao xung ack
SDA=1;
scl1();
delay();
if(!SDA)
ret=1;
SCL=0;
delay();
return ret;
}
uchar i2cread(void)
{
uchar ret,i;
for(i=0;i<8;++i)
{
ret<<=1;
scl1();
delay();
ret|=SDA;
SCL=0;
delay();
}
//gui tra lai ack
SDA=0;
scl1();
delay();
SCL=0;
delay();
return ret;
}
uchar i2creadlast(void)
{
uchar ret,i;
for(i=0;i<8;++i)
{
ret<<=1;
scl1();
delay();
ret|=SDA;
SCL=0;
delay();
}
//gui tra lai not ack
SDA=1;
scl1();
delay();
SCL=0;
delay();
return ret;
}
void i2cstart(void)
{
SDA=1;
scl1();
SDA=0;
delay();
SCL=0;
delay();
}
void delay(void)
{
uchar i;
for(i=0;i<5;++i);
}
void khoitaods(void)
{
uchar c;
i2cstart();
i2cwrite(DSW);
i2cwrite(0);//ghi vao dia chi 0
i2cstart();
i2cwrite(DSR);
c=i2creadlast();
if(c&0x80)
{
i2cstart();
i2cwrite(DSW);
i2cwrite(0);
i2cwrite(0);
}
i2cstop();
}
void capnhatgio(void)
{
//cap nhat lai gio phut giay
i2cstart();
i2cwrite(DSW);
i2cwrite(0);
i2cstart();
i2cwrite(DSR);
giay=i2cread();
phut=i2cread();
gio=i2creadlast();
i2cstop();
}
Comment