[SOLVED] lcd 4 bit error .. trying to interfcing with 8051 in single port

thannara123 · Dec 29, 2013

Code:

.............................main...................................
[FONT=Courier New][COLOR=#339933]#include <REGX51.H>[/COLOR][/FONT]

[FONT=Courier New][COLOR=#339933]#define LCDPORT P2[/COLOR][/FONT]

[FONT=Courier New]sbit RS = LCDPORT ^ [COLOR=#cc66cc]2[/COLOR];[/FONT]

[FONT=Courier New]sbit E = LCDPORT ^ [COLOR=#cc66cc]3[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#339933]#include "lcd.h"[/COLOR][/FONT]

[FONT=Courier New][COLOR=#993333]void[/COLOR] main[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New] [/FONT]

[FONT=Courier New]    lcd_init[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x80[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_data[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];		[COLOR=#808080][I]// just send "1" to lcd to display ;[/I][/COLOR][/FONT]

[FONT=Courier New]    [COLOR=#b1b100]while[/COLOR] [COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}

[/COLOR]..................................................................................................

 ........................lcd.h.......................

[FONT=Courier New][COLOR=#339933]#include"delay.h"[/COLOR][/FONT]
[FONT=Courier New] [/FONT]
[FONT=Courier New] [/FONT]
[FONT=Courier New][COLOR=#993333]void[/COLOR] latch[COLOR=#66cc66]([/COLOR][COLOR=#993333]void[/COLOR][COLOR=#66cc66])[/COLOR][/FONT]
[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]
[FONT=Courier New]    E = [COLOR=#cc66cc]1[/COLOR];[/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    E = [COLOR=#cc66cc]0[/COLOR];[/FONT]
[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]
[FONT=Courier New] [/FONT]
[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_cmd[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]char[/COLOR] c[COLOR=#66cc66])[/COLOR][/FONT]
[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]
[FONT=Courier New]    RS = [COLOR=#cc66cc]0[/COLOR];[/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]10[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]
[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    c = [COLOR=#66cc66]([/COLOR]c << [COLOR=#cc66cc]4[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]
[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]
[FONT=Courier New] [/FONT]
[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_data[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]char[/COLOR] c[COLOR=#66cc66])[/COLOR][/FONT]
[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]
[FONT=Courier New]    RS = [COLOR=#cc66cc]1[/COLOR];[/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]10[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]
[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    c = [COLOR=#66cc66]([/COLOR]c << [COLOR=#cc66cc]4[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]
[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]
[FONT=Courier New] [/FONT]
[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_init[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR][/FONT]
[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x28[COLOR=#66cc66])[/COLOR];		[COLOR=#808080][I]// Function set (4-bit interface, 2 lines, 5*7Pixels)[/I][/COLOR][/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x28[COLOR=#66cc66])[/COLOR];		[COLOR=#808080][I]// Function set (4-bit interface, 2 lines, 5*7Pixels)[/I][/COLOR][/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x0c[COLOR=#66cc66])[/COLOR];		[COLOR=#808080][I]// Make cursorinvisible[/I][/COLOR][/FONT]
[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x6[COLOR=#66cc66])[/COLOR];		[COLOR=#808080][I]// Set entry Mode(auto increment of cursor)[/I][/COLOR][/FONT]
[FONT=Courier New][COLOR=#66cc66]}

[/COLOR].......................................................................................................[COLOR=#66cc66]
[/COLOR]
................................ delay.h[COLOR=#66cc66][/COLOR].........................[COLOR=#66cc66]
 
[/COLOR]
[/FONT]


[LIST=1]
[*][FONT=Courier New][COLOR=#993333]void[/COLOR] delay[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]int[/COLOR] j[COLOR=#66cc66])[/COLOR][/FONT]

[*][FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[*][FONT=Courier New]    [COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]int[/COLOR] i = [COLOR=#cc66cc]0[/COLOR];[/FONT]

[*][FONT=Courier New]    [COLOR=#b1b100]for[/COLOR] [COLOR=#66cc66]([/COLOR]; i < j; i++[COLOR=#66cc66])[/COLOR];[/FONT]

[*][FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]

[*][FONT=Courier New] 
[/FONT]
[/LIST]
[COLOR=#66cc66]

[/COLOR]
[/FONT]

js · Dec 29, 2013

I cant test because delay.h missing......
Which version of Keil compiler you have? Problems is with simulation or ...?

tushki7 · Dec 29, 2013

printf("Greetings,")
main()
{No delay.h ???}
#include<Good Luck.h> //

- - - Updated - - -

js said:
Stupid questions are better than stupid mistakes.

Make every stupid/silly mistake you can, in that way you will learn more.

js · Dec 29, 2013

example:
https://www.electroons.com/8051/electroons/lcd_4_bit.html

thannara123 · Dec 30, 2013

I am attaching the whole project file with Proteus

jayanth.devarayanadurga · Dec 30, 2013

Your lcddata() function prints characters but you are sending digit. Send something like '1' and see if it works.

thannara123 · Dec 30, 2013

sir did you look the data masking and shifiting section .I have some doubts there ?
is there correct sending MSB and LSB ?

jayanth.devarayanadurga · Dec 30, 2013

Code C - [expand]
1
2
3
4
LCDPORT = c & 0xf0;
latch();
c = (c << 4);
LCDPORT = c & 0xf0;

Say c = 0xAB

c & 0xF0 = 0A0 which is sent to D4 to D7

c = c << 4 makes c = 0xB0 and

c & 0xF0 becomes 0xB0 which is sent to D4 to D7

so, c = c<< 4 is enough, you don't need c & 0xF0

Code C - [expand]
1
2
3
4
LCDPORT = c & 0xf0;
latch();
c = (c << 4);
LCDPORT = c;

thannara123 · Dec 30, 2013

I will check out sir and will the result soon
thanks again .

thannara123 · Dec 30, 2013

Not working .. I cant debug that ?

tushki7 · Dec 30, 2013

Post your whole code and the error window!!!

thannara123 · Dec 31, 2013

there no error .. now I can debug (due to separate header file i cant debug now okay ).

after build up ,in Proteus there is no output . blank

Code:

[FONT=Courier New][COLOR=#339933]#include <REGX51.H>[/COLOR][/FONT]

[FONT=Courier New][COLOR=#339933]#define LCDPORT P2[/COLOR][/FONT]

[FONT=Courier New]sbit RS = LCDPORT ^ [COLOR=#cc66cc]2[/COLOR];[/FONT]

[FONT=Courier New]sbit E = LCDPORT ^ [COLOR=#cc66cc]3[/COLOR];[/FONT]


[FONT=Courier New][COLOR=#993333]void[/COLOR] delay[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]int[/COLOR] itime[COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    [COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]int[/COLOR] i, j;[/FONT]

[FONT=Courier New]    [COLOR=#b1b100]for[/COLOR] [COLOR=#66cc66]([/COLOR]i = [COLOR=#cc66cc]0[/COLOR]; i < itime; i++[COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New]	[COLOR=#b1b100]for[/COLOR] [COLOR=#66cc66]([/COLOR]j = [COLOR=#cc66cc]0[/COLOR]; j < [COLOR=#cc66cc]1275[/COLOR]; j++[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]

[FONT=Courier New] 
[/FONT]









[FONT=Courier New][COLOR=#993333]void[/COLOR] latch[COLOR=#66cc66]([/COLOR][COLOR=#993333]void[/COLOR][COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    E = [COLOR=#cc66cc]1[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    E = [COLOR=#cc66cc]0[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]



[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_cmd[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]char[/COLOR] c[COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    RS = [COLOR=#cc66cc]0[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]

[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    LCDPORT = [COLOR=#66cc66]([/COLOR]c << [COLOR=#cc66cc]4[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]



[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_data[COLOR=#66cc66]([/COLOR][COLOR=#993333]unsigned[/COLOR] [COLOR=#993333]char[/COLOR] c[COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    RS = [COLOR=#cc66cc]1[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]2[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    LCDPORT = c & 0xf0;[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]



[FONT=Courier New]    LCDPORT = [COLOR=#66cc66]([/COLOR]c << [COLOR=#cc66cc]4[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    latch[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]



[FONT=Courier New][COLOR=#993333]void[/COLOR] lcd_init[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    delay[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x30[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x28[COLOR=#66cc66])[/COLOR];        [COLOR=#808080][I]// Function set (4-bit interface, 2 lines, 5*7Pixels)[/I][/COLOR][/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x28[COLOR=#66cc66])[/COLOR];        [COLOR=#808080][I]// Function set (4-bit interface, 2 lines, 5*7Pixels)[/I][/COLOR][/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x0c[COLOR=#66cc66])[/COLOR];        [COLOR=#808080][I]// Make cursorinvisible[/I][/COLOR][/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x6[COLOR=#66cc66])[/COLOR];        [COLOR=#808080][I]// Set entry Mode(auto increment of cursor)[/I][/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR][/FONT]











[FONT=Courier New][COLOR=#993333]void[/COLOR] main[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR][/FONT]

[FONT=Courier New][COLOR=#66cc66]{[/COLOR][/FONT]

[FONT=Courier New]    lcd_init[COLOR=#66cc66]([/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_cmd[COLOR=#66cc66]([/COLOR]0x80[COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New]    lcd_data[COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]2[/COLOR][COLOR=#66cc66])[/COLOR];        [COLOR=#808080][I]// just send "1" to lcd to display ;[/I][/COLOR][/FONT]

[FONT=Courier New]    P3 = 0xf0;[/FONT]

[FONT=Courier New]    [COLOR=#b1b100]while[/COLOR] [COLOR=#66cc66]([/COLOR][COLOR=#cc66cc]1[/COLOR][COLOR=#66cc66])[/COLOR];[/FONT]

[FONT=Courier New][COLOR=#66cc66]}[/COLOR]
[/FONT]

used diffrent delay whats the wrong with it ?

Raady Here · Dec 31, 2013

in your program where did u configure your port pins that you have connected to LCD ??
why did you write functions in header file ?

jayanth.devarayanadurga · Dec 31, 2013

Code C - [expand]
1
P2 = 0x00;

missing.

thannara123 · Dec 31, 2013

yes given P2 = 0x00;
but nothing happens .
i used header file firstly but in keil i cant debug correctly without header file can be check the register value ...

whats the wrong with me ?

tushki7 · Dec 31, 2013

Code:

#define LCDPORT P2
[COLOR="#008000"]sbit RW = P2^1;[/COLOR]
sbit RS = LCDPORT ^ 2;
sbit E = LCDPORT ^ 3;

Code:

void lcd_cmd(unsigned char c)
{
    
    LCDPORT = c & 0xf0;
    RS = 0;
    RW = 0;
    delay(10);
    latch();
    c = (c << 4);
    LCDPORT = c & 0xf0;
    RS = 0;
    RW = 0;
    delay(10);
    latch();
}
void lcd_data(unsigned char c)
{
    LCDPORT = c & 0xf0;
    RS = 1;
    RW = 0;
    delay(10);
    latch();
    c = (c << 4);
    LCDPORT = c & 0xf0;
    RS = 1;
    RW = 0;
    delay(10);
    latch();
}

thannara123 · Dec 31, 2013

But sir RW already have connected to ground , is that 0 ?

tushki7 · Dec 31, 2013

thannara123 said:
But sir RW already have connected to ground , is that 0 ?

wait, I will send you correct program..

FvM · Dec 31, 2013

Writing to LCDPORT resets also the lower P2 bits to zero, in this case RS. Means you are always writing to command register, never to data.

Code:

LCDPORT = c & 0xf0;

thannara123 · Dec 31, 2013

thanks sir ., may i know how to send RS value along with data value . can I use an OR function ?

LCDPORT = c & 0xf4; ?

Code C - [expand]
1 2 3 4	LCDPORT = c & 0xf0; latch(); c = (c << 4); LCDPORT = c & 0xf0;

[SOLVED] lcd 4 bit error .. trying to interfcing with 8051 in single port

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