I"m trying to read RTC using pic16f176a , but getting only 00 on lcd display

[kushal nandanwar]

i2c_init();
i2c_start();

i2c_send(0xa0);
i2c_send(0x00);
i2c_send(5);
i2c_stop();
__delay_ms(100);
i2c_start();
i2c_send(0xa0);
i2c_send(0x00);
i2c_restart();
i2c_send(0xa1);
sec = i2c_read();
i2c_stop();


void i2c_init()
{
TRISC3 = 1;
TRISC4 = 1;
SSPSTAT |= 0x80; //Slew Rate Disabled
SSPADD = 0x28;

SSPCON=0x28; //Master mode


}


void i2c_start(void)
{
SEN = 1;

while (SEN == 1)
continue;

}

 

[KlausST]

Hi,

you think we all here waiting for your riddle?

But the answer is easy: You simply don´t output any data to a LCDisplay. So how can it change?

* Undocumented code
* only a snippet
* no info about RTC hardware
* no definiton of variables


Klaus

 

[kushal nandanwar]

PIC16f876A and RTC1307


void i2c_restart(void)
{
RSEN = 1;

while (RSEN == 1)
continue;

}

void i2c_stop(void)
{
PEN=1;
while(PEN==1)
continue;
}

void i2c_wait(void)
{
while( RW == 1)
continue;
if(ACKSTAT == 1)
{
i2c_stop();
}

}

void i2c_send(unsigned char dat)
{
SSPBUF = dat;
while(BF);
i2c_wait();
}

unsigned char i2c_read(void)
{
unsigned char temp;
RCEN = 1;
while(BF == 0)
continue;
temp = SSPBUF;
i2c_wait();
ACKDT=1;
ACKEN=1;
while(ACKEN == 1)
continue;
i2c_stop();
return temp;
}


unsigned char rtc1307_read(unsigned char address)
{
unsigned char temp;
i2c_start();
i2c_send(0xD0);
i2c_send(address);
i2c_restart();
i2c_send(0xD1);
temp = i2c_read();

return temp;
}

 

[milan.rajik]

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