Funduino: ATtiny45 PCF8574 LCD DS1307 Show Time Only by TinyWireM.h

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Tiny45WireMasterI2C.rar
header file: TinyWireM.zip
Code:

/* ATtiny45 as an I2C Master
* I2C master reading DS1307 RTC. (display with LCD(contol by PCF8574))
* SETUP:
* ATtiny Pin 1 = (RESET) N/U ATtiny Pin 8 = VCC (2.7-5.5V)
* ATtiny Pin 2 = NC ATtiny Pin 7 = SCK (DS1307 and PCF8574)
* ATtiny Pin 3 = NC ATtiny Pin 6 = NC
* ATtiny Pin 4 = GND ATtiny Pin 5 = SDA (DS1307 and PCF8574)
*/

#include <TinyWireM.h> // I2C Master lib for ATTinys which use USI
#define PCF8574_ID 0x20//0x40
#define DS1307_ID 0x68 //1101000[R/W] ; 001=slave address ; Read=1
#define ATcommand 0x20 //LCD command EN=1 ; RS=0 0010 0000
#define ATdata 0x30 //LCD data EN=1 ; RS=1 0011 0000
//DS1307 Clock Buffer
byte second=0x00;
byte minute=0x24;
byte hour=0x19;
byte wkDay=0x01;
byte date=0x22;
byte month=0x01;
byte year=0x12;
byte ctrl=0x00;;

void PCF8574_Write(unsigned char data)
{
TinyWireM.beginTransmission(PCF8574_ID);
TinyWireM.send(data); // Access Command Register
TinyWireM.endTransmission(); // Send to the slave
//delayMicroseconds(16); // minimun~16-20
}
void Write_LCD_Byte(char command_data ,int value) //bool lcd_command ,
{
int iMSB=0;
int iLSB=0;
iMSB = (value & 0xF0)>>4;
iLSB = (value & 0x0F);
PCF8574_Write(command_data|iMSB);//0xFF
PCF8574_Write(0x00|iMSB);
PCF8574_Write(command_data|iLSB);
PCF8574_Write(0x00|iLSB);
delay(1);
}

void initial_LCD(void)
{
//delay(50);//ให้รออย่างน้อย 15ms
PCF8574_Write(0x00);//ให้ขา E = 0 ให้ขา RS= 0 กำหนดเป็นคำสั่ง ให้ขา R/W = 0 เขียนข้อมูล
//delay(50);
//ส่งข้อมูลค่ำสั่ง Function Set 3 ครั้ง ข้อมูล D4-D7 จะถูกส่งไปที่ bus
PCF8574_Write(0x23); //1 0x20 + 0x03
//delayMicroseconds(1);
PCF8574_Write(0x03);
//delay(5); //wait 4ms
PCF8574_Write(0x23); //2
//delayMicroseconds(1);
PCF8574_Write(0x03);
//delayMicroseconds(100); //wait 100us
PCF8574_Write(0x23); //3
//delayMicroseconds(1);
PCF8574_Write(0x03);
//end
//กำหนดการทำงานของ LCD ให้เป็น 4 bit 0010xxxx
PCF8574_Write(0x22);//Function Set (BIT5=1) [001DNF00 ],Sets buss size 4bit (D=0)ข้อมูลเฉพาะ D4-D7 จะถูกส่งออกไปที่บัส
//delayMicroseconds(1);
PCF8574_Write(0x02);
//end เมื่อเป็น 4 bit ต้องส่งข้อมูลคำสั่งสองครั้งๆ ละ 4 bit
//Function Set (BIT5=1) 0x28 กำหนด ขนาดข้อมูล,จำนวนบรรทัด, ขนาดตัวอักษร
Write_LCD_Byte(ATcommand,0x28);// 00101000 : [001DNF00 ],Sets buss size 4bit (D=0),number of lines=2 (N=1),font size =5x7(F=0)
//Display/Cursor (BIT3=1) 0x0C กำหนดการแสดงผล, เคอร์เซอร์
Write_LCD_Byte(ATcommand,0x0C);//00001100 : [00001DUB] ,Display On (D=1),Cursor Off (U=0) ,blinking block cursor Off (B=0)
//Entry Mode Set (BIT2=1) 0x06 โหมดการป้อนข้อมูล
Write_LCD_Byte(ATcommand,0x06);//00000110 : [000001MS] , Cursor direction right (M=1);no scroll (S=0)
//0x01 clear screen
Write_LCD_Byte(ATcommand,0x01);
//0x0F cursor on
//Write_LCD_Byte(ATcommand,0x0F);
}
//--------------------------end LCD library---------------------
void DS1307_Write(byte ibuff_write)
{
TinyWireM.beginTransmission(DS1307_ID);
TinyWireM.send(ibuff_write); // Access Command Register
TinyWireM.endTransmission(); // Send to the slave
delayMicroseconds(16); // minimun~16-20
}
byte DS1307_Read(void)
{
byte ibuff;
TinyWireM.requestFrom(DS1307_ID,1); // Request 1 byte from slave
ibuff= TinyWireM.receive(); // get the temperature
return(ibuff);
}
void GetClock(void)
{
DS1307_Write(0x00);
second = DS1307_Read();
minute = DS1307_Read();
hour = DS1307_Read();
wkDay = DS1307_Read();
date = DS1307_Read();
month = DS1307_Read();
year = DS1307_Read();
ctrl = DS1307_Read();
}
void SetClock()
{
TinyWireM.beginTransmission(DS1307_ID);
TinyWireM.send(0x00); // start Address fist
TinyWireM.send(second); // Access Command Register
TinyWireM.send(minute); // Access Command Register
TinyWireM.send(hour); // Access Command Register
TinyWireM.send(wkDay); // Access Command Register
TinyWireM.send(date); // Access Command Register
TinyWireM.send(month); // Access Command Register
TinyWireM.send(year); // Access Command Register
TinyWireM.send(ctrl); // Access Command Register
TinyWireM.endTransmission(); // Send to the slave
delayMicroseconds(16); // minimun~16-20
}
void PrintDayName(byte Name)
{
switch (Name)
{
case 1: Write_LCD_Byte(ATdata,'S');
Write_LCD_Byte(ATdata,'u');
Write_LCD_Byte(ATdata,'n');
break;
case 2: Write_LCD_Byte(ATdata,'M');
Write_LCD_Byte(ATdata,'o');
Write_LCD_Byte(ATdata,'n');
break;
case 3: Write_LCD_Byte(ATdata,'T');
Write_LCD_Byte(ATdata,'u');
Write_LCD_Byte(ATdata,'e');
break;
case 4: Write_LCD_Byte(ATdata,'W');
Write_LCD_Byte(ATdata,'e');
Write_LCD_Byte(ATdata,'d');
break;
case 5: Write_LCD_Byte(ATdata,'T');
Write_LCD_Byte(ATdata,'h');
Write_LCD_Byte(ATdata,'u');
break;
case 6: Write_LCD_Byte(ATdata,'F');
Write_LCD_Byte(ATdata,'r');
Write_LCD_Byte(ATdata,'i');
break;
case 7: Write_LCD_Byte(ATdata,'S');
Write_LCD_Byte(ATdata,'a');
Write_LCD_Byte(ATdata,'t');
break;
default: Write_LCD_Byte(ATdata,'?');
Write_LCD_Byte(ATdata,'?');
Write_LCD_Byte(ATdata,'?');
}
}
void PrintMonthName(byte Name)
{
switch (Name)
{
case 1: Write_LCD_Byte(ATdata,'J');
Write_LCD_Byte(ATdata,'a');
Write_LCD_Byte(ATdata,'n');
break;
case 2: Write_LCD_Byte(ATdata,'F');
Write_LCD_Byte(ATdata,'e');
Write_LCD_Byte(ATdata,'b');
break;
case 3: Write_LCD_Byte(ATdata,'M');
Write_LCD_Byte(ATdata,'a');
Write_LCD_Byte(ATdata,'r');
break;
case 4: Write_LCD_Byte(ATdata,'A');
Write_LCD_Byte(ATdata,'p');
Write_LCD_Byte(ATdata,'r');
break;
case 5: Write_LCD_Byte(ATdata,'M');
Write_LCD_Byte(ATdata,'a');
Write_LCD_Byte(ATdata,'y');
break;
case 6: Write_LCD_Byte(ATdata,'J');
Write_LCD_Byte(ATdata,'u');
Write_LCD_Byte(ATdata,'n');
break;
case 7: Write_LCD_Byte(ATdata,'J');
Write_LCD_Byte(ATdata,'u');
Write_LCD_Byte(ATdata,'y');
break;
case 8: Write_LCD_Byte(ATdata,'A');
Write_LCD_Byte(ATdata,'u');
Write_LCD_Byte(ATdata,'g');
break;
case 9: Write_LCD_Byte(ATdata,'S');
Write_LCD_Byte(ATdata,'e');
Write_LCD_Byte(ATdata,'p');
break;
case 10: Write_LCD_Byte(ATdata,'O');
Write_LCD_Byte(ATdata,'c');
Write_LCD_Byte(ATdata,'t');
break;
case 11: Write_LCD_Byte(ATdata,'N');
Write_LCD_Byte(ATdata,'o');
Write_LCD_Byte(ATdata,'v');
break;
case 12: Write_LCD_Byte(ATdata,'D');
Write_LCD_Byte(ATdata,'e');
Write_LCD_Byte(ATdata,'c');
break;
default: Write_LCD_Byte(ATdata,'?');
Write_LCD_Byte(ATdata,'?');
Write_LCD_Byte(ATdata,'?');
}
}
void setup()
{
TinyWireM.begin(); // initialize I2C lib
initial_LCD();
//SetClock();
}
void loop()
{
byte buff10;
GetClock();
Write_LCD_Byte(ATcommand,0x80|0x00);// line 1 เริ่มตำแหน่ง 00
buff10=hour&0x0f;
Write_LCD_Byte(ATdata,((hour>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
Write_LCD_Byte(ATdata,':');
buff10=minute&0x0f;
Write_LCD_Byte(ATdata,((minute>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
Write_LCD_Byte(ATdata,':');
buff10=second&0x0f;
Write_LCD_Byte(ATdata,((second>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
Write_LCD_Byte(ATcommand,0x80|0x40);// line 2 เริ่มตำแหน่ง 00
PrintDayName(wkDay);
Write_LCD_Byte(ATdata,0xff);//|
buff10=date&0x0f;
Write_LCD_Byte(ATdata,((date>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
Write_LCD_Byte(ATdata,0xff);//|
buff10=month&0x0f;
PrintMonthName(((month>>4)*10)+buff10);
Write_LCD_Byte(ATdata,0xff);// |
Write_LCD_Byte(ATdata,'2');
Write_LCD_Byte(ATdata,'0');
buff10=year&0x0f;
Write_LCD_Byte(ATdata,((year>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
Write_LCD_Byte(ATdata,' ');// 0x7c|
buff10=ctrl&0x0f;
Write_LCD_Byte(ATdata,((ctrl>>4)&0x0f)+0x30);
Write_LCD_Byte(ATdata,buff10+0x30);
}