4.Program [Kembali]
#include "Includes.h"
// Global RTC Array and temp variable
unsigned char pRTCArray[4];
unsigned char Temp;
// Function Purpose: Write_Byte_To_DS1307_RTC writes a single byte on given address
// Address can have any value fromm 0 to 0xFF, and DataByte can have a value of 0 to 0xFF.
void Write_Byte_To_DS1307_RTC(unsigned char Address, unsigned char DataByte)
{
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_Write_Byte(DataByte); // Write data byte
I2C_Stop(); // Stop i2c communication
}
// Function Purpose: Read_Byte_From_DS1307_RTC reads a single byte from given address
// Address can have any value fromm 0 to 0xFF.
unsigned char Read_Byte_From_DS1307_RTC(unsigned char Address)
{
unsigned char Byte = 0; // Variable to store Received byte
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c
// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(Device_Address_DS1307_EEPROM + 1);
Byte = I2C_Read_Byte(); // Read byte from EEPROM
// Make SCK low, so that slave can stop driving SDA pin
// Send a NACK to indiacate single byte read is complete
I2C_Send_NACK();
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
__delay_us(HalfBitDelay); // Half bit delay
Set_SDA_High; // Make SDA high
__delay_us(HalfBitDelay); // Half bit delay
return Byte; // Return the byte received from 24LC64 EEPROM
}
// Function Purpose: Write_Bytes_To_DS1307_RTC writes mulitple bytes from given starting address.
// Address can have any value fromm 0 to 0xFF and pData is pointer to the array
// containing NoOfBytes bytes in it. NoOfBytes is the number of bytes to write.
void Write_Bytes_To_DS1307_RTC(unsigned char Address,unsigned char* pData,unsigned char NoOfBytes)
{
unsigned int i;
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
for(i=0;i<NoOfBytes;i++) // Write NoOfBytes
I2C_Write_Byte(pData[i]); // Write data byte
I2C_Stop(); // Stop i2c communication
}
// Function Purpose: Read_Bytes_From_DS1307_RTC reads a NoOfBytes bytes from given starting address.
// Address can have any value fromm 0 to 0xFF. NoOfBytes is the number of bytes to write.
// Read bytes are returned in pData array.
void Read_Bytes_From_DS1307_RTC(unsigned char Address, unsigned char* pData, unsigned int NoOfBytes)
{
unsigned int i;
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c
// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(Device_Address_DS1307_EEPROM + 1);
pData[0] = I2C_Read_Byte(); // Read First byte from EEPROM
for(i=1;i<NoOfBytes;i++) // Read NoOfBytes
{
I2C_Send_ACK(); // Give Ack to slave to start receiving next byte
pData[i] = I2C_Read_Byte(); // Read next byte from EEPROM
}
// Make SCK low, so that slave can stop driving SDA pin
// Send a NACK to indiacate read operation is complete
I2C_Send_NACK();
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
__delay_us(HalfBitDelay); // Half bit delay
Set_SDA_High; // Make SDA high
__delay_us(HalfBitDelay); // Half bit delay
}
// Function Purpose: Set_DS1307_RTC_Time sets given time in RTC registers.
// Mode can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// Hours can have value from 0 to 23 only.
// Mins can have value from 0 to 59 only.
// Secs can have value from 0 to 59 only.
void Set_DS1307_RTC_Time(unsigned char Mode, unsigned char Hours, unsigned char Mins, unsigned char Secs)
{
// Convert Hours, Mins, Secs into BCD
pRTCArray[0] = (((unsigned char)(Secs/10))<<4)|((unsigned char)(Secs%10));
pRTCArray[1] = (((unsigned char)(Mins/10))<<4)|((unsigned char)(Mins%10));
pRTCArray[2] = (((unsigned char)(Hours/10))<<4)|((unsigned char)(Hours%10));
switch(Mode) // Set mode bits
{
case AM_Time: pRTCArray[2] |= 0x40; break;
case PM_Time: pRTCArray[2] |= 0x60; break;
default: break; // do nothing for 24HoursMode
}
// WritepRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x00, pRTCArray, 3);
}
// Function Purpose: Get_DS1307_RTC_Time returns current time from RTC registers.
// Pointer to pRTCArray is returned, in this array
// pRTCArray[3] can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// pRTCArray[2] (Hours byte) can have value from 0 to 23 only.
// pRTCArray[1] (Mins byte) can have value from 0 to 59 only.
// pRTCArray[0] (Secs byte) can have value from 0 to 59 only.
unsigned char* Get_DS1307_RTC_Time(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x00, pRTCArray, 3);
// Convert Secs back from BCD into number
Temp = pRTCArray[0];
pRTCArray[0] = ((Temp&0x7F)>>4)*10 + (Temp&0x0F);
// Convert Mins back from BCD into number
Temp = pRTCArray[1];
pRTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Hours back from BCD into number
if(pRTCArray[2]&0x40) // if 12 hours mode
{
if(pRTCArray[2]&0x20) // if PM Time
pRTCArray[3] = PM_Time;
else // if AM time
pRTCArray[3] = AM_Time;
Temp = pRTCArray[2];
pRTCArray[2] = ((Temp&0x1F)>>4)*10 + (Temp&0x0F);
}
else // if 24 hours mode
{
Temp = pRTCArray[2];
pRTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);
pRTCArray[3] = TwentyFourHoursMode;
}
return pRTCArray;
}
// Function Purpose: Set_DS1307_RTC_Date sets given date in RTC registers.
// Year can have a value from 0 to 99 only.
// Month can have value from 1 to 12 only.
// Date can have value from 1 to 31 only.
// Day can have value from 1 to 7 only. Where 1 means Monday, 2 means Tuesday etc.
void Set_DS1307_RTC_Date(unsigned char Date, unsigned char Month, unsigned char Year, unsigned char Day)
{
// Convert Year, Month, Date, Day into BCD
pRTCArray[0] = (((unsigned char)(Day/10))<<4)|((unsigned char)(Day%10));
pRTCArray[1] = (((unsigned char)(Date/10))<<4)|((unsigned char)(Date%10));
pRTCArray[2] = (((unsigned char)(Month/10))<<4)|((unsigned char)(Month%10));
pRTCArray[3] = (((unsigned char)(Year/10))<<4)|((unsigned char)(Year%10));
// WritepRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x03, pRTCArray, 4);
}
// Function Purpose: Get_DS1307_RTC_Date returns current date from RTC registers.
// Pointer to pRTCArray is returned, in this array
// pRTCArray[3] (Year byte) can have value from 0 to 99 only.
// pRTCArray[2] (Month byte) can have value from 1 to 12 only.
// pRTCArray[1] (Date byte) can have value from 1 to 31 only.
// pRTCArray[0] (Day byte) can have value from 1 to 7 only.
unsigned char* Get_DS1307_RTC_Date(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x03, pRTCArray, 4);
// Convert Date back from BCD into number
Temp = pRTCArray[1];
pRTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Month back from BCD into number
Temp = pRTCArray[2];
pRTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Year back from BCD into number
Temp = pRTCArray[3];
pRTCArray[3] = (Temp>>4)*10 + (Temp&0x0F);
return pRTCArray;
}
// Global RTC Array and temp variable
unsigned char pRTCArray[4];
unsigned char Temp;
// Function Purpose: Write_Byte_To_DS1307_RTC writes a single byte on given address
// Address can have any value fromm 0 to 0xFF, and DataByte can have a value of 0 to 0xFF.
void Write_Byte_To_DS1307_RTC(unsigned char Address, unsigned char DataByte)
{
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_Write_Byte(DataByte); // Write data byte
I2C_Stop(); // Stop i2c communication
}
// Function Purpose: Read_Byte_From_DS1307_RTC reads a single byte from given address
// Address can have any value fromm 0 to 0xFF.
unsigned char Read_Byte_From_DS1307_RTC(unsigned char Address)
{
unsigned char Byte = 0; // Variable to store Received byte
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c
// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(Device_Address_DS1307_EEPROM + 1);
Byte = I2C_Read_Byte(); // Read byte from EEPROM
// Make SCK low, so that slave can stop driving SDA pin
// Send a NACK to indiacate single byte read is complete
I2C_Send_NACK();
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
__delay_us(HalfBitDelay); // Half bit delay
Set_SDA_High; // Make SDA high
__delay_us(HalfBitDelay); // Half bit delay
return Byte; // Return the byte received from 24LC64 EEPROM
}
// Function Purpose: Write_Bytes_To_DS1307_RTC writes mulitple bytes from given starting address.
// Address can have any value fromm 0 to 0xFF and pData is pointer to the array
// containing NoOfBytes bytes in it. NoOfBytes is the number of bytes to write.
void Write_Bytes_To_DS1307_RTC(unsigned char Address,unsigned char* pData,unsigned char NoOfBytes)
{
unsigned int i;
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
for(i=0;i<NoOfBytes;i++) // Write NoOfBytes
I2C_Write_Byte(pData[i]); // Write data byte
I2C_Stop(); // Stop i2c communication
}
// Function Purpose: Read_Bytes_From_DS1307_RTC reads a NoOfBytes bytes from given starting address.
// Address can have any value fromm 0 to 0xFF. NoOfBytes is the number of bytes to write.
// Read bytes are returned in pData array.
void Read_Bytes_From_DS1307_RTC(unsigned char Address, unsigned char* pData, unsigned int NoOfBytes)
{
unsigned int i;
I2C_Start(); // Start i2c communication
// Send i2c address of DS1307 with write command
while(I2C_Write_Byte(Device_Address_DS1307_EEPROM + 0) == 1)// Wait until device is free
{ I2C_Start(); }
I2C_Write_Byte(Address); // Write Address byte
I2C_ReStart(); // Restart i2c
// Send i2c address of DS1307 RTC with read command
I2C_Write_Byte(Device_Address_DS1307_EEPROM + 1);
pData[0] = I2C_Read_Byte(); // Read First byte from EEPROM
for(i=1;i<NoOfBytes;i++) // Read NoOfBytes
{
I2C_Send_ACK(); // Give Ack to slave to start receiving next byte
pData[i] = I2C_Read_Byte(); // Read next byte from EEPROM
}
// Make SCK low, so that slave can stop driving SDA pin
// Send a NACK to indiacate read operation is complete
I2C_Send_NACK();
// Send start bit and then stop bit to stop transmission
Set_SDA_Low; // Make SDA Low
__delay_us(HalfBitDelay); // Half bit delay
Set_SDA_High; // Make SDA high
__delay_us(HalfBitDelay); // Half bit delay
}
// Function Purpose: Set_DS1307_RTC_Time sets given time in RTC registers.
// Mode can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// Hours can have value from 0 to 23 only.
// Mins can have value from 0 to 59 only.
// Secs can have value from 0 to 59 only.
void Set_DS1307_RTC_Time(unsigned char Mode, unsigned char Hours, unsigned char Mins, unsigned char Secs)
{
// Convert Hours, Mins, Secs into BCD
pRTCArray[0] = (((unsigned char)(Secs/10))<<4)|((unsigned char)(Secs%10));
pRTCArray[1] = (((unsigned char)(Mins/10))<<4)|((unsigned char)(Mins%10));
pRTCArray[2] = (((unsigned char)(Hours/10))<<4)|((unsigned char)(Hours%10));
switch(Mode) // Set mode bits
{
case AM_Time: pRTCArray[2] |= 0x40; break;
case PM_Time: pRTCArray[2] |= 0x60; break;
default: break; // do nothing for 24HoursMode
}
// WritepRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x00, pRTCArray, 3);
}
// Function Purpose: Get_DS1307_RTC_Time returns current time from RTC registers.
// Pointer to pRTCArray is returned, in this array
// pRTCArray[3] can have a value AM_Time or PM_Time or TwentyFourHoursMode only.
// pRTCArray[2] (Hours byte) can have value from 0 to 23 only.
// pRTCArray[1] (Mins byte) can have value from 0 to 59 only.
// pRTCArray[0] (Secs byte) can have value from 0 to 59 only.
unsigned char* Get_DS1307_RTC_Time(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x00, pRTCArray, 3);
// Convert Secs back from BCD into number
Temp = pRTCArray[0];
pRTCArray[0] = ((Temp&0x7F)>>4)*10 + (Temp&0x0F);
// Convert Mins back from BCD into number
Temp = pRTCArray[1];
pRTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Hours back from BCD into number
if(pRTCArray[2]&0x40) // if 12 hours mode
{
if(pRTCArray[2]&0x20) // if PM Time
pRTCArray[3] = PM_Time;
else // if AM time
pRTCArray[3] = AM_Time;
Temp = pRTCArray[2];
pRTCArray[2] = ((Temp&0x1F)>>4)*10 + (Temp&0x0F);
}
else // if 24 hours mode
{
Temp = pRTCArray[2];
pRTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);
pRTCArray[3] = TwentyFourHoursMode;
}
return pRTCArray;
}
// Function Purpose: Set_DS1307_RTC_Date sets given date in RTC registers.
// Year can have a value from 0 to 99 only.
// Month can have value from 1 to 12 only.
// Date can have value from 1 to 31 only.
// Day can have value from 1 to 7 only. Where 1 means Monday, 2 means Tuesday etc.
void Set_DS1307_RTC_Date(unsigned char Date, unsigned char Month, unsigned char Year, unsigned char Day)
{
// Convert Year, Month, Date, Day into BCD
pRTCArray[0] = (((unsigned char)(Day/10))<<4)|((unsigned char)(Day%10));
pRTCArray[1] = (((unsigned char)(Date/10))<<4)|((unsigned char)(Date%10));
pRTCArray[2] = (((unsigned char)(Month/10))<<4)|((unsigned char)(Month%10));
pRTCArray[3] = (((unsigned char)(Year/10))<<4)|((unsigned char)(Year%10));
// WritepRTCArray to DS1307
Write_Bytes_To_DS1307_RTC(0x03, pRTCArray, 4);
}
// Function Purpose: Get_DS1307_RTC_Date returns current date from RTC registers.
// Pointer to pRTCArray is returned, in this array
// pRTCArray[3] (Year byte) can have value from 0 to 99 only.
// pRTCArray[2] (Month byte) can have value from 1 to 12 only.
// pRTCArray[1] (Date byte) can have value from 1 to 31 only.
// pRTCArray[0] (Day byte) can have value from 1 to 7 only.
unsigned char* Get_DS1307_RTC_Date(void)
{
// Read Hours, Mins, Secs register from RTC
Read_Bytes_From_DS1307_RTC(0x03, pRTCArray, 4);
// Convert Date back from BCD into number
Temp = pRTCArray[1];
pRTCArray[1] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Month back from BCD into number
Temp = pRTCArray[2];
pRTCArray[2] = (Temp>>4)*10 + (Temp&0x0F);
// Convert Year back from BCD into number
Temp = pRTCArray[3];
pRTCArray[3] = (Temp>>4)*10 + (Temp&0x0F);
return pRTCArray;
}
5.Flow chart [Kembali]
6.Rangkayan Simulasi [Kembali]
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