interfacing LCD mdule with PIC 16f877a

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chalani0088

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Hi , I want to interface LCD module with PIC 16f877a

I used the following code and used Hitech C

my main program is,

#include <htc.h>
#include "lcd.h"

void
main(void)
{
lcd_init();
lcd_goto(0); // select first line
lcd_puts("12345678");
lcd_goto(0x40); // Select second line
lcd_puts("Hello world");

for(;;
}

and I have attached the LCD source code and also the circuit I used,

But it didn't display anything and showed black rectangulars, didnt show cursor either/

Can anybody help me

thnk you
 

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  • lcd.txt
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  • circuit.png
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I don't know C so I will restrict my comments to the circuit. You don't need the 10uF capacitor and it would be better to remove it and instead of connecting the Vee line to ground it would be better to have a 5K pot. Have you set the configuration word correctly? that is HS mode with the watchdog off and the power on timer on. In the circuit you have a 12Mhz crystal and the software it is 4 Mhz.
 
Schematic looks okey. But the schematic and your code doesn't match.
1. Frequency mentioned in schematic is 12Mhz. But in code, it is 4Mhz.
2. LCD pins RS, R/W, EN and Data D0 - D7 pins are connected to RA0, RA1, RA2 , RB0-RB7 pins in schematic. change the code as connections in schematic.

Change the following and load the hex in your microcontroller.

Best wishes
 
Give some delay after the lcd_init() function.
This gives some time for the LCD to initialize.
About 10ms-50ms would be enough.

This us usually the problem when we see the LCD fully lit up with all black rectangles.
 
thank you all for supporting me. Yes it is the problem with frequencies. oscillator frequency didn't match with the programmed frequency. I corrected the errors in my circuit. Now its functioning well

Regards
Chalani
 

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