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#include "DS3231.H"
/************************* Global Variables ***************************/
xdata uchar sec, min, hour, day, date, month, year;
xdata uchar Dtemp;
/**************************** functions ******************************/
void delay()
{
;;
}
void start() /* --------- Initiate start condition ---------- */
{
sda = 1; delay();
scl = 1; delay();
sda = 0; delay();
scl = 0;
}
void stop() /* ---------- Initiate stop condition ----------- */
{
sda = 0; delay();
scl = 1; delay();
sda = 1; delay();
scl = 0;
}
void i2cack()
{
uchar i=0;
scl=1;delay();
while(sda==1 && i<255) i++;
scl=0;delay();
}
void i2cwrite(uchar d) /* ----------------------------- */
{
uchar i;
scl = 0;
for (i = 0;i < 8; i++)
{
sda = d & 0x80; /* Send the msbits first */
scl = 0;delay();
scl = 1;delay();
d = d << 1; /* do shift here to increase scl high time */
scl = 0;
}
sda = 1;delay(); /* Release the sda line */
scl = 0;delay();
}
uchar i2cread(uchar b) /* ----------------------------------- */
{
uchar i, d;
d = 0;
sda = 1;delay(); /* Let go of sda line */
scl = 0;delay();
for (i = 0; i < 8; i++) /* read the msb first */
{
scl = 1;delay();
d = d << 1;
d = d | (uchar)sda;
scl = 0;delay();
}
sda = b;delay(); /* low for ack, high for nack */
scl = 1;delay();
scl = 0;delay();
sda = 1;delay(); /* Release the sda line */
return d;
}
void i2cwrite_add(uchar address,uchar dat)//指定地址寫一個字節數據
{
start();
i2cwrite(ADDRTC);
i2cack();
i2cwrite(address);
i2cack();
i2cwrite(dat);
i2cack();
stop();
}
uchar i2cread_add(uchar address)
//指定地址讀一個字節數據
{
uchar dd;
start();
i2cwrite(ADDRTC);
i2cack();
i2cwrite(address);
i2cack();
start();
i2cwrite(ADDRTC);
i2cack();
dd=i2cread(0);
stop();
return dd;
}
void InitDS3231() /* ----- set time & date; user data entry ------ */
{
scl=1;delay();
sda=1;delay();
start();
i2cwrite(ADDRTC); /* write slave address, write 1339 */
i2cwrite(0x00); /* write register address, 1st clock register */
i2cwrite(0x00); //秒
i2cwrite(0x01); //分
i2cwrite(0x01); //時
i2cwrite(0x03); //星期
i2cwrite(0x12); //日
i2cwrite(0x01); //月
i2cwrite(0x11); //年
//i2cwrite(0x10); /* enable sqw, 1hz output */
stop();
}
void GetTime() /* --- get date/time from DS3231 --- */
{
//while(int0); /* loop until int pin goes low */
//start();
//i2cwrite(ADDRTC);
//i2cwrite(0x0f);
//i2cwrite(0); /* clear alarm flags */
//stop();
start();
i2cwrite(ADDRTC);
i2cwrite(0);
start();
i2cwrite(ADDRTC | 1);
sec = i2cread(ACK);
min = i2cread(ACK);
hour= i2cread(ACK);
day = i2cread(ACK);
date= i2cread(ACK);
month= i2cread(ACK);
year= i2cread(NACK);
stop();
}
void read_temp() /* -------- read temperature -------- */
{
int itemp;
float ftemp;
do
{
start();
i2cwrite(ADDRTC);
i2cwrite(0x0e); /* address of control register */
start();
i2cwrite(ADDRTC + 1); /* send the device address for read */
itemp = i2cread(NACK); /* get the control register value */
stop();
} while(itemp & 0x20); /* wait until CNVT bit goes inactive */
start();
i2cwrite(ADDRTC);
i2cwrite(0x11); /* address of temperature MSB */
start();
i2cwrite(ADDRTC + 1); /* send the device address for read */
itemp = ( (int) i2cread(ACK) << 5 );
itemp += ( i2cread(NACK) >> 3);
stop();
if(itemp & 0x1000) itemp += 0xe000; /* if sign bit set, make 16 bit 2's comp */
ftemp = 0.03125 * (float) itemp; /* convert to degrees C */
/* ftemp = ftemp * 9 / 5 + 32; /* skip this if you don't want degrees F */
Dtemp = (uchar) ftemp;
}
/*void frq_out_tog() // --- toggle en32khz bit to enable/disable sqw ---
{
uchar val;
start();
i2cwrite(ADDRTC);
i2cwrite(0x0f); // control/status reg address
start();
i2cwrite(ADDRTC + 1); //send the device address for read
val = i2cread(NACK);
stop();
val ^= 0x08; //toggle en32khz bit
start();
i2cwrite(ADDRTC);
i2cwrite(0x0f); //control/status reg address
i2cwrite(val);
stop();
}*/
void init_alrm() /* --- enable alarm 1 for once-per-second --- */
{
start();
i2cwrite(ADDRTC);
i2cwrite(7); /* 1st alarm 1 reg address */
i2cwrite(0x80); /* mask alarm register */
i2cwrite(0x80);
i2cwrite(0x80);
i2cwrite(0x80);
stop();
start();
i2cwrite(ADDRTC);
i2cwrite(0x0e); /* control/status reg address */
i2cwrite(0x05); /* enable interrupts, alarm 1 output */
}
void comm_init() /* ------ reset DS3231 comm interface ------ */
{
do /* because the DS3231 I2C interface is active for both supplies */
{ /* after a micro reset, we must get the comm into a known state */
sda = 1; /* make sure master has released SDA */
scl = 1;
if(sda) /* if sda is high, generate a start */
{
sda = 0; /* The DS3231 will recognize a valid start */
sda = 1; /* condition anywhere in a I2C data transfer */
}
scl = 0;
} while(sda == 0); /* if the DS3231 is holding sda low, try again */
}

復制代碼

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