void OneWireWriteByte(unsigned char sendbyte)
{
unsigned char status;
int poll_count = 0;
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_1WWB);
I2CWrite(sendbyte);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CAck();
do
{
status = I2CRead();
}
while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));
I2CNotAck();
I2CStop();
status = I2CRead();
if (poll_count >= POLL_LIMIT)
DS2482Reset();
}
/******读SD2200实时数据寄存器******/
void I2CReadDate(void)
{
uchar m,tmp;
if(!I2CStart())return;
I2CSendByte(0x65,1);//从年开始读取数据
if(!I2CWaitAck()){I2CStop();return;}
for(m=0;m<7;m++)
{
timeBuf[m]=I2CReceiveByte();
if (m!=6) //最后一个数据不应答
{
I2CAck();
}
}
I2CNoAck();
I2CStop();
/*
for(m=0;m<SEND_TIME_LEN;m++)
{ //BCD处理
tmp=timeBuf[m+4]/16;
sendTimeBuf[m]=timeBuf[m+4]%16;
sendTimeBuf[m]=sendTimeBuf[m]+tmp*10;
showTimeBuf[2*m]=timeBuf[m+4]/16;
showTimeBuf[2*m+1]=timeBuf[m+4]%16;
}*/
//展开处理 因小时需单独处理 12点以上的需减去40
tmp=timeBuf[4]/16;
sendTimeBuf[0]=timeBuf[4]%16;
sendTimeBuf[0]=sendTimeBuf[0]+tmp*10;
if(sendTimeBuf[0]>=40){
sendTimeBuf[0]-=40;
}
showTimeBuf[0]=sendTimeBuf[0]/10;
showTimeBuf[1]=sendTimeBuf[0]%10;
tmp=timeBuf[5]/16;
sendTimeBuf[1]=timeBuf[5]%16;
sendTimeBuf[1]=sendTimeBuf[1]+tmp*10;
showTimeBuf[2]=sendTimeBuf[1]/10;
showTimeBuf[3]=sendTimeBuf[1]%10;
tmp=timeBuf[6]/16;
sendTimeBuf[2]=timeBuf[6]%16;
sendTimeBuf[2]=sendTimeBuf[2]+tmp*10;
showTimeBuf[4]=sendTimeBuf[2]/10;
showTimeBuf[5]=sendTimeBuf[2]%10;
//年月日
tmp=timeBuf[0]/16;
sendTimeBuf[3]=timeBuf[0]%16;
sendTimeBuf[3]=sendTimeBuf[3]+tmp*10;
tmp=timeBuf[1]/16;
sendTimeBuf[4]=timeBuf[1]%16;
sendTimeBuf[4]=sendTimeBuf[4]+tmp*10;
tmp=timeBuf[2]/16;
sendTimeBuf[5]=timeBuf[2]%16;
sendTimeBuf[5]=sendTimeBuf[5]+tmp*10;
}
void main()
{
/* Buffer where we will read/write our data */
unsigned char I2CData[] = {0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x09, 0x00};
unsigned char i;
/* Initialize I2C Port */
I2CInit();
/* Send Start condition */
I2CStart();
/* Send DS1307 slave address with write operation */
I2CSend(0xD0);
/* Send subaddress 0x00, we are writing to this location */
I2CSend(0x00);
/* Loop to write 8 bytes */
for (i = 0; i < 8; i++)
{
/* send I2C data one by one */
//I2CSend(I2CInitval[i]);
I2CSend(I2CData[i]);
}
/* Send a stop condition - as transfer finishes */
I2CStop();
/* We will now read data from DS1307 */
/* Reading for a memory based device always starts with a dummy write */
/* Send a start condition */
I2CStart();
/* Send slave address with write */
I2CSend(0xD0);
/* Send address for dummy write operation */
/* this address is actually where we are going to read from */
I2CSend(0x00);
/* Send a repeated start, after a dummy write to start reading */
I2CRestart();
/* send slave address with read bit set */
I2CSend(0xD1);
/* Loop to read 8 bytes from I2C slave */
for (i = 8; i > 0; i--) {
/* read a byte */
I2CData[i] = I2CRead();
/* ACK if its not the last byte to read */
/* if its the last byte then send a NAK */
if (i - 1)
I2CAck();
else
I2CNak();
}
/* Send stop */
I2CStop();
/* end of program */
while(1);
}
/**
* Use the DS2482 help command '1-Wire triplet' to perform one bit of a 1-Wire
* search. This command does two read bits and one write bit. The write bit is
* either the default direction (all device have same bit) or in case of a
* discrepancy, the 'search_direction' parameter is used.
*
* @param search_direction
* @return The DS2482 status byte result from the triplet command
*/
unsigned char DS2482SearchTriplet(int search_direction)
{
unsigned char status;
int poll_count = 0;
// 1-Wire Triplet (Case B)
// S AD,0 [A] 1WT [A] SS [A] Sr AD,1 [A] [Status] A [Status] A\ P
// \--------/
// Repeat until 1WB bit has changed to 0
// [] indicates from slave
// SS indicates byte containing search direction bit value in msbit
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_1WT);
I2CWrite(search_direction ? 0x80 : 0x00);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CAck();
do
{
status = I2CRead();
}
while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));
I2CNotAck();
I2CStop();
I2CRead();
// check for failure due to poll limit reached
if (poll_count >= POLL_LIMIT)
{
DS2482Reset();
return false;
}
// return status byte
return status;
}
unsigned char OneWireReadByte(void)
{
unsigned char data, status;
int poll_count = 0;
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_1WRB);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CAck();
do
{
status = I2CRead();
}
while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));
I2CNotAck();
I2CStop();
I2CRead();
if (poll_count >= POLL_LIMIT)
{
DS2482Reset();
return false;
}
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_SRP);
I2CWrite(DS2482_READPTR_RDR);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CNotAck();
I2CStop();
data = I2CRead();
return data;
}
unsigned char OneWireTouchBit(unsigned char sendbit)
{
unsigned char status;
int poll_count = 0;
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_1WSB);
I2CWrite(sendbit ? 0x80 : 0x00);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CAck();
do
{
status = I2CRead();
}
while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));
I2CNotAck();
I2CStop();
status = I2CRead();
if (poll_count >= POLL_LIMIT)
{
DS2482Reset();
return false;
}
// check for single bit result
if (status & DS2482_STATUS_SBR)
return true;
else
return false;
}
unsigned char OneWireReset(void)
{
unsigned char status = 0;
int poll_count = 0;
I2CStart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);
I2CWrite(DS2482_CMD_1WRS);
I2CRestart();
I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);
I2CAck();
do
{
status = I2CRead();
}
while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));
I2CNotAck();
I2CStop();
status = I2CRead();
if (poll_count >= POLL_LIMIT)
{
DS2482Reset();
return false;
}
// check for presence detect
if (status & DS2482_STATUS_PPD)
return true;
else
return false;
}
