[help] 16*2 character lcd problem

change this statement:
for(k=0; k<7; k++)
to
for(k-=0;k<6;k++)
as the loop will execute seven times (including zero). that would initiate a seventh command word to the LCD which might be causing problems

corrected, but still nothing.

i think there is some problem in ready. when i tried to simulate this program in avr studio, the program stuck in ready function.

i think due to the commands 0x80 and 0xc0 makes the condition of loop in ready true.

when i didnot use ready, a cursor produced at first position in first line. but not charater still.
any suggestions?

can you try the program i gave in my tutorial?

finally it worked. i we (me and my friends) worte the code from the beginning from lcd tutorial and mazidi book. Without using ready(or busy) and any pointers, the new code worked. i still think that there is some problem in ready function in old code. Here is the new code ---

#include<avr\io.h>

#include<util\delay.h>


#define F_CPU 1000000UL

#define dataport PORTA
#define comm PORTB

#define rs 0
#define rw 1
#define en 2


void datawr(char c)
{
	DDRA = 0xFF;
	dataport = c;
	comm |= (1<<rs);
	comm &= ~(1<<rw);
	comm |= (1<<en);
	_delay_ms(50);
	comm &= ~(1<<en);	
	
}
 
void command(char d)
{
	DDRA = 0xFF;
	dataport = d;
        comm &= ~(1<<rs);
        comm &= ~(1<<rw);
        comm |= (1<<en);
        _delay_ms(50);
	comm &= ~(1<<en);
	}
	
void intial(void)
{
        int j;
        char b[]={0x38, 0x0c, 0x01, 0x84};
        for(j=0; j<4; j++)
        {
                 command(b[j]);
                 _delay_ms(50);
          }
  }

 
int main (void)
{
	  int i;
	  char a[]="Hello";
	  DDRB = 0xFF;
	  intial();
	
	  for(i=0;i<5;i++)
	  {
	          datawr(a[i]);
	         _delay_ms(50);
           }	
	
	  while(1)
	  {
	  }
}

great work, rahul.
i will still find out what the problem was using the busy line and post it here.
till then :bye

in custom characters, i am able to print them but i dont understand the purpose of word 'location' usin in the tutorial code.

void LCD_build(unsigned char [location, unsigned char *ptr){
      unsigned char i;
      if(location<8){
          LCD_command(0x40+(location*8));
          for(i=0;i<8;i++)
             LCD_senddata(ptr[ i ]);
     }
}

one more thing --- when i dont use 0x06 (right increment command), the cursor still moves towards right after each aplabat.

location means which location on CGRAM, as you can have 8 custom characters so, you can give location from 0 to 7 to define where your custom char will be stored

hi rahul,
I have succesfully interfaced the LCD using the busy line and also displayed custom characters. do look into it.
checked it for 8mhz internal oscillator.

P.S.:
ur previous code was fine except for some timing problems.

here is a snapshot: