//I2C.h //Declare some functions void I2C_Init(void); // khởi tạo I2C ở chế độ Master, Baud = 100 Khz void I2C_waitForIdle(void); // Chờ khi nào đường bus ở chế độ Idle (rảnh rỗi) void I2C_Start(void); // Khởi động I2C - Master chiếm đường bus void I2C_repStart(void); // Chế độ Restart void I2C_stop(void); // Stop I2C - Master nhường đường bus cho thiết bị khác unsigned char I2C_write( unsigned char I2CWriteData ); // ghi một byte lên đường SDA unsigned char I2C_read( unsigned char ack ); // Đọc một byte với mã ACK (ACK = 0 nếu ack = 1, và ACK = 1 nếu ack = 0) -> dùng xác nhận từ master đối với slave. void I2C_NACK(void); // tạo bít Not Ack
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// I2C.c
# include "pic.h"
# include "I2C.h"
//======================================================================================================
void I2C_Init(void){
/* // Configure for Master Mode
SSPM3 = 1;
SSPM2 = 0;
SSPM1 = 0;
SSPM0 = 0; ss // I2C Master Mode, clock = Fosc/(4*(SSPADD + 1));
WCOL = 0; //No conllision
SSPEN = 1; // Enables the serial port and
*/
SSPCON = 0b00101000; // set IIC port to Master mode with BRG
SSPSTAT = 0b00000000; // Standard speed mode - 100Hz
SSPCON2 = 0;
//TRIS_SCL = 0;
//TRIS_SDA = 0; // configure SDA and SCL as Output
SSPADD = 9; // BAUD = 100KHz
SSPIF = 0; // clear SSPIF interrupt flag
BCLIF = 0; // clear bus collision flag
STAT_CKE = 0; // use I2C levels worked also with '0'
STAT_SMP = 1; // disable slew rate control worked also with '0'
}
//=============================================================================
void I2C_waitForIdle(void)
{
while (( SSPCON2 & 0x1F ) | STAT_RW) ; //CLRWDT(); // wait for idle and not writing
}
//=============================================================================
void I2C_Start(void){
//SSPIF = 0;
SEN = 1;
//while(!SSPIF);
while(SEN);
}
//==============================================================================
void I2C_repStart(void)
{
I2C_waitForIdle();
RSEN = 1;
}
//=============================================================================
void I2C_stop(void)
{
I2C_waitForIdle();
PEN = 1;
}
//==============================================================================
unsigned char I2C_write( unsigned char I2CWriteData ){
I2C_waitForIdle();
SSPBUF = I2CWriteData;
I2C_waitForIdle();
return (!ACKSTAT); // function returns '1' if transmission is acknowledged
// 1: Success
// 0: Fail to send
}
//============================================================================
unsigned char I2C_read( unsigned char ack ){
unsigned char I2C_ReadData;
I2C_waitForIdle();
RCEN = 1;
I2C_waitForIdle();
I2C_ReadData = SSPBUF;
I2C_waitForIdle();
if ( ack ) ACKDT=0;
else ACKDT = 1;
ACKEN = 1; // send acknowledge sequence
I2C_waitForIdle();
return( I2C_ReadData );
}
/******************************************************************************************/
void I2C_NACK(void)
{
I2C_waitForIdle();
if (ACKSTAT){
PEN=1; //Stop
I2C_waitForIdle(); //Wait until action is finished
while(PEN);
};
}
?#include <pic18.h>
#include <stdio.h>
#include "delay.h"
#include "i2c.h"
#include "LCD.h"
//***************************************************************************//
__CONFIG(1,HSPLL & USBPLL & PLLDIV5 & CPUDIV1 & FCMDIS & IESODIS);
__CONFIG(2,VREGEN & PWRTDIS & BOREN & BORV20 & WDTDIS & WDTPS32K);
__CONFIG(3,CCP2RC1 & PBADDIS & LPT1DIS & MCLREN);
__CONFIG(4,STVREN & LVPDIS & XINSTDIS & DEBUGDIS);
__CONFIG(5,UNPROTECT);
__CONFIG(6,UNPROTECT);
__CONFIG(7,UNPROTECT);
//=============================================================================
typedef unsigned char BYTE;
//==========================
// initial DS1307
//==========================
void init_DS1307()
{
SSPMode(MASTER_MODE);
}
//==========================
// write data one byte to
// DS1307
//==========================
void write_DS1307(BYTE address, BYTE data)
{
short int status;
i2c_Start();
i2c_SendByte(0xd0);
i2c_SendByte(address);
i2c_SendByte(data);
// i2c_Stop();
i2c_Restart();
status=i2c_SendByte(0xd0);
while(status==1)
{
i2c_Start();
status=i2c_SendByte(0xd0);
}
}
//==========================
// read data one byte from DS1307
//==========================
BYTE read_DS1307(BYTE address)
{
BYTE data;
i2c_Start();
i2c_SendByte(0xd0);
i2c_SendByte(address);
i2c_Start();
i2c_SendByte(0xd1);
data=i2c_GetByte(0);
i2c_Stop();
return(data);
}
void main(void)
{
int sec,min,hour,day,date,month,year;
char buffer[16];
//Timer
T1CON = 0b00011101; //Clock chia 2
LCD_Init();
init_DS1307();
sec=read_DS1307(0);
write_DS1307(0,sec & 0x7F); // enable oscillator(bit 7 =0)
while(1)
{
sec=read_DS1307(0); // read second
min=read_DS1307(1); // read minute
hour=read_DS1307(2); // read hour
day=read_DS1307(3); // read day
date=read_DS1307(4); // read date
month=read_DS1307(5); // read month
year=read_DS1307(6); // read year
sprintf(buffer,"Time:%02X:%02X:%02X",hour,min,sec);
LCD_Gotoxy(1,1); //Cot 1, dong 2
LCD_WriteString(buffer);
sprintf(buffer,"Date:%02X/%02X/20%02X\r\n",date,month,year);
LCD_Gotoxy(1,2); //Cot 1, dong 2
LCD_WriteString(buffer);
DelayBigMs(500);
CLRWDT();
}
}
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