ask for sample project i2c using pic16f877 and microC

[lgsg89]

can anyone give or share to me a sample i2c project using a pic16f877?? tnx

 

[Ian Rogers]

ASM , C, Basic ?

 

[lgsg89]

its mikroC

 

[Ian Rogers]

I don't use mikroc but are there not examples in the installation folder? There are many on this site that use mikroc so someone will have sample code..

 

[rmain1972]

The MikroC help file has example code under I2C hardware library.

 

[be80be]

Take a good look at this https://embedded-lab.com/blog/?p=2583 lgsg89 It's has a lot of nice tutorials, And it's all in MikroC so thats a plus. Hope it helps

Oh by the way the link is for I2C real nice tutorial.

 

[lgsg89]

@ Rmain1972

i know that..the problem is,i need a display output for this project and i don't understand the example in MikroC..

@ be80be

tnx for the link..i'm only required to use a PIC16F877..

 

[be80be]

lgsg89 The code over there is chip independent. That's the beauty of C you may have to change some registers.

Not a real biggie But the writer goes into great details on how it works. Now if your looking for some one to do all the work that's not going to do you any real justice. You'll not learn much that way. Write some code post it and we will help you get it working.

 

[lgsg89]

unsigned short hh;
unsigned short mm;
unsigned short ss;
unsigned char x[17];

void write_DS1307(unsigned short address, unsigned short data)
{
unsigned short status;
I2C_Start();
I2C_Wr(0xd0);
I2C_Wr(address);
I2C_Wr(data);
I2C_Stop();
}

unsigned short read_DS1307(unsigned short address)
{
unsigned short data;
I2C_Start();
I2C_Wr(0xd0);
I2C_Wr(address);
I2C_Repeated_Start();
I2C_Wr(0xd1);
data=I2C_Rd(0);
while (!I2C_Is_Idle()) asm nop;
I2C_Stop();
return(data);
}


void main(){
PORTB = 0;
TRISB = 0;

PORTD = 0;
TRISD = 0;

hh = 0;
mm = 0;
ss = 0;

Lcd_Init(&PORTD);
Lcd_Out(1,1,"Init...");
I2C_Init(100000); //DS1307 operates at 100Khz only

ss=read_ds1307(0);
write_ds1307(0, ss & 0x7F); // enable oscillator(bit 7 =0)

ss=read_ds1307(2);
write_ds1307(2, ss & 0b10111111); // set 24H mode



while(1)
{
ss=read_ds1307(0); // read second
mm=read_ds1307(1); // read minute
hh=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
*/

Lcd_Chr(1,1, 48+ ((hh & 0b00110000) >> 4));
Lcd_Chr(1,2, 48+ (hh & 0b00001111) );

Lcd_Chr(1,3, ':');

Lcd_Chr(1,4, 48+ ((mm & 0b01110000) >> 4));
Lcd_Chr(1,5, 48+ (mm & 0b00001111) );

Lcd_Chr(1,6, ':');

Lcd_Chr(1,7, 48+ ((ss & 0b01110000) >> 4));
Lcd_Chr(1,8, 48+ (ss & 0b00001111) );


delay_ms(1000);
}
}

tnx be80be,
here..i don't know where the problem is..when i play the isis, it only diplays 00:00:00

 

[lgsg89]

btw, i'm using a PIC16f877,ds1307 and a LCD

 

[Ian Rogers]

ISIS will not simulate the I2C bus with actual resistor values... Use "Pullup" resistor primitive and it will work.

 

[lgsg89]

@ Ian Rogers

tnx Ian Rogers.. it work..

one more thing,,can anyone examine my code,so that i can also display the date..tnx

 

[IsaacChuah90]

Hi lgsg89. I'm also doing the same project with you. Would you like to implement an alarm into this project and make it like alarm clock? Do you know how to write the coding for the alarm? Or any other coding can I refer to? Thanks for the reply.

 

[lgsg89]

@ IsaacChuah90

nope..sorry..

 

[IsaacChuah90]

is ok.anyway thanks.

 

[lgsg89]

if you finish your alarm clock,can u share it??

 

[IsaacChuah90]

If I have done it, for sure I will share it for you guys.But now I having the problem in writing the coding for alarm.Hope any of you guys can help me.

 

[Ian Rogers]

I read the clock into an array,

//Write a byte to The RTC
char WriteRTC(char Address, char Byte)
	{
	SendID(0b11010000);
	if(SendByte(Address&0xff)==0)
		return(0);
	if(SendByte(Byte)==0)
		return(0);
	SendStop();
	return(1);
	}

//Read a byte from the RTC
char ReadRTC(char Address)
	{
	char Byte;
	SendID(0b11010000);
	if(SendByte(Address&0xff)==0)
		return(0);
	SendRestart();
	if(SendByte(0b11010001)==0)
		return(0);
	Byte=ReceiveByte();
	SendNack();
	SendStop();
	return(Byte);
	}

void WriteClock(char *array)
	{
	char x;
	for(x=0;x<8;x++)
		WriteRTC(x,array[x]);	
	}	

void ReadClock(char *array)
	{
	char x;
	for(x=0;x<8;x++)
		array[x] = ReadRTC(x);	
	}

Remember to sort the array BIN /BCD and visa versa now you can create two / three or even four 7 byte array's

then compare !!

If you need this code I'll gladly share

 

[IsaacChuah90]

Ian Rogers,can I know the code above is for what function?

 

[IsC_hope]

Ian Rogers,do you have the coding for adding alarm for DS1307 with PIC16F877A?It seem like I'm doing the same thing with lgsg89.