i have done that thing also

September 2, 2014 at 1:42 pm #12120

Participant

i have done that thing also nothing is wrong with the lcd …

this is my actual code:

here is my code:

#include<avr/io.h>                 //This is the header for AVR Microcontroller.
#define F_CPU 12000000UL
#include “i2cmaster.h”
#include<util/delay.h>
#include”lcd118010.h”                  //lcd
#define mpu 0X68                     //address of the i2c device
int main(void)
{
unsigned char ret=0;

DDRC=0X00;
PORTC=0X00; //disabling the internal pull up for sda,scl
lcd_init();
i2c_init(); //initialise i2c communication

while(1)
{
lcd_string(“hi “);
_delay_ms(1000);

ret=i2c_rep_start(mpu); //send adress to recognize slave device and if ret=0 device is accesible ret=1 device is not accessible

lcd_showvalue(ret); //print that value on lcd
_delay_ms(1900);

lcd_clear(); //clear lcd & continue
}
}
[/CODE]

my observations :lcd is printing “hi” but, ret value is not printing(neither 1 nor 0) and neither is lcd clearing.

“””but if i am commenting ret=i2c_rep_start(mpu); “”””

then only lcd clears & rexecutes the loop

how do i solve this problem? is my sensor ok!!

[CODE]
#include<avr/io.h>                 //This is the header for AVR Microcontroller.
#define F_CPU 12000000UL
#include “i2cmaster.h”
#include<util/delay.h>
#include”lcd118010.h”                  //lcd
#define mpu 0X68                     //address of the i2c device
int main(void)
{
unsigned char ret=0;