Problem in lcd interfacing with pic16f877a

[Venkadesh_M]

hi guys , finally i found the problem in the lcd.its because of the loose contact of the wires to the lcd from controller .i made the lcd soldered then its fine .now its displaying the text .

can you help me to display the letters in running manner....

Nice to hear it.....

 

[mathespbe]

hi guys , finally i found the problem in the lcd.its because of the loose contact of the wires to the lcd from controller .i made the lcd soldered then its fine .now its displaying the text .

can you help me to display the letters in running manner....

Hi,
nice to here your mistake. To make the rolling display jst look on the data sheet of LCD for left/right shift mode....
just make a initial command for shift is enough... U doesn't need to command it to shift for every time...

 

[rangerskm]

hi friends ,,i want to display seconds from 00 to 59 in seven segment display .for that i am using 2 led displays.i am not clear about multiplexing .it will be kindfull if you helped me in it.i tried the code ,but its not working in simulation its malfunctioning

//common anode display

#include<pic.h>
#define _XTAL_FREQ 20000000
#define ctrl0 RD0
#define ctrl1 RD1
#define ctrl2 RD3
#define ctrl3 RD4
unsigned char digidisp=0;
static int min2,min1,sec2,sec1;
unsigned char digival[10]={0xc0,0xf9,0XA4,0xB0,0x19,0X6D,0x7D,0x07,0x7F,0X6F};
void interrupt isr()
{
TMR0IF=0;

TMR0=0X00;
ctrl0=ctrl1=ctrl2=ctrl3=0;
digidisp++;
digidisp=digidisp%4;

switch(digidisp)
{
case 0:
{

PORTB=digival[sec2];
ctrl0=1;
break;
}
case 1:
{

PORTB=digival[sec1];
ctrl1=1;
break;
}
case 2:
{

PORTB=digival[min1];
ctrl2=1;
break;
}
case 3:
{

PORTB=digival[min2];
ctrl3=1;
break;
}
}
}


void main()
{
TRISB=0X00;
PORTB=0X00;
TRISD=0X00;
PORTD=0X00;
OPTION_REG=0X00;
TMR0=0X00;
TMR0IF=0;
GIE=1;
PEIE=1;
TMR0IE=1;
min2=min1=sec2=sec1=0;
while(1)        // Forward counting
     {
          min2=min1=sec2=sec1=0;
          
                for(sec2=0;sec2<6;sec2++)
                {
                     for(sec1=0;sec1<10;sec1++)
                     {
                    __delay_ms(1000);
                    }
                }
               
        
     
}
}