Writing custom characters to LCD display

[skimask]

Hi, i have written this program to make custom character on 2*16 LCD but LCD shows nothing.i use picbasic pro and PIC16F877A. what's the problem?

If you study post #2 of this thread, you'll find your problem...

[amindzo]

i have studied that post but i still have problem. post 2 just specify the 8 location but LCD is 2*16.what about other locations?

[mackrackit]

i have studied that post but i still have problem. post 2 just specify the 8 location but LCD is 2*16.what about other locations?

The 8 locations are memory locations in the LCD.

Take a look at post #32
Copy that code.

[skimask]

i have studied that post but i still have problem. post 2 just specify the 8 location but LCD is 2*16.what about other locations?

If you had studied post #2 (and the rest of the posts), you'd notice that you can only program the first 8 locations in the LCD's ram.
You may be setting up the first few custom characters in the LCD ram, but you surely aren't trying to display them...

[Darrel Taylor]

These answers are so easy.

Why do they always turn into personal attacks.

If they don't get it. Explain it again.
Maybe your version will make more sense.
<br>

[mackrackit]

These answers are so easy.

Why do they always turn into personal attacks.

If they don't get it. Explain it again.
Maybe your version will make more sense.
<br>

No personal attack intended. I thought post #32 explained it...

There are 8 memory locations on most LCDs, starting at $40 and ending at $78. Each custom character will be at one of these locations.
character 0 = $40
character 1= $48
character 2 = $50
character 3= $58
character 4 = $60
character 5= $68
character 6 = $70
character 7= $78

In your code

lcdout $fe,$40,$08,$04,$02,$01,$01,$02,$04,$08

writes your character to "0" position. or character 0

To display that character on the first line, first space

LCDOUT $FE,1,0

second space

LCDOUT $FE,$81,0

If you have a character in the second memory location
lcdout $fe,$48,$08,$04,$02,$01,$01,$02,$04,$08


To display that character on the first line, first space

LCDOUT $FE,1,1

second space

LCDOUT $FE,$81,1

[Darrel Taylor]

Sorry Dave, wasn't refering to you.

But your new explanation might help someone.
<br>

[amindzo]

thanks for your help,i wrote my character on LCD but what should i do if i want to write all 16 character on LCD in both line 1 and 2? we just have 8 location for RAM.should i overwrite on location 0 to 7 again? is my character in first 8 space deleted or it continue writing automatically on next 8 space?

[ELROJO_85]

HI DEAR ELECTRONIC HOBBYST:

I'M FROM MEXICO AND I REALLY WANT TO LEARN ABOUT THIS TOPIC HOW TO CREATE MY OWN CHARACTER, BUT I DON'T REALLY KNOW HWAT HAPPENED I HAVE TROUBLES ON THE SIMULATION WITH PROTEUS ALL OF YOUR EXAMPLES AND ONLY ONE WORKS THE EXAMPLE THAT IS POSTED ON THE NUMBER 8, BATT LEVEL BUT ALL OF THE OTHER ONES DOESN'T WORKS I HAVE TRIED IN MANY WAYS, I USE PIC BASIC PRO TRYING TO CHARGE MY OWN PROGRAM ON A PIC16F877A CHEK IT OUT !

COULD SOMEBODY TELL ME WHAT'S GOING WRONG ??

DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTD
DEFINE LCD_RSBIT 1
DEFINE LCD_EREG PORTD
DEFINE LCD_EBIT 3
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 140

DEFINE ADC_BITS 8
DEFINE ADC_CLOCK 4
DEFINE ADC_SAMPLEUS 50

ADCON1=%00001110
TRISA=%111111
TRISB=%00000000
TRISC=%00000000
TRISD=%00000000
TRISE=%000
PORTA=0
PORTB=0
PORTC=0
PORTD=0
PORTE=0
LoopCount VAR BYTE
Clear

LCDOut $FE,$60,$00,$0a,$0a,$00,$00,$11,$0e,$00 ; #4 Smiley Face


Pause 1000

MAIN

For LoopCount = 1 TO 80
LCDOut 4
Next LoopCount

GoTo MAIN


THANKS FOR YOUR ATTENTION AND IF SOMEBODY COULD TELL ME HOW TO PUT IN ON WORKING, THAT COULD BE GREATE !! SEE YOU SOON HAVE A NICE DAY

[mackrackit]

Maybe try

LCDOUT $FE,1,4

[ELROJO_85]

HEY DAVE, THANKS A LOT MAN I REALLY APRECIATE THAT HELP BY YOURSELF.
YEAH, I KNOW I SHOULD WEAR SAFETY GLASSES WHEN I'M PROGRAMMING jajaja WILL NOT BE DE DEVIL IF I KILL MYSELF PROGRAMMING WITHOUT IT !! jaja WELL LET ME TRY ANOTHER EXAMPLES MAN

THANKS A LOT AGAIN

[fratello]

I try to display some characters, using this code :

; http://www.darreltaylor.com/files/CustChar.htm

  LCDOUT  $FE,$40,$04,$0A,$04,$00,$00,$00,$00,$00  ' Cust Char #0      degree Celsius
  LCDOUT  $FE,$48,$0A,$1F,$11,$11,$11,$11,$11,$1F  ' Cust Char #1      empty batt
  LCDOUT  $FE,$50,$0A,$1F,$11,$11,$11,$11,$1F,$1F  ' Cust Char #2      1/5 batt
  LCDOUT  $FE,$58,$0A,$1F,$11,$11,$11,$1F,$1F,$1F  ' Cust Char #3      2/5 batt
  LCDOUT  $FE,$60,$0A,$1F,$11,$11,$1F,$1F,$1F,$1F  ' Cust Char #4      3/5 batt
  LCDOUT  $FE,$68,$0A,$1F,$11,$1F,$1F,$1F,$1F,$1F  ' Cust Char #5      4/5 batt
  LCDOUT  $FE,$70,$0A,$1F,$1F,$1F,$1F,$1F,$1F,$1F  ' Cust Char #6      full batt

.....

char_batt:
batt = TmpW / 100        ; (TmpW is war word ; reading ADC)
select case batt
case batt < 105
char = 1
case batt => 105 and batt =< 115 
char = 2
case batt => 116 and batt =< 125
char = 3
case batt => 126 and batt =< 130
char = 4
case batt => 131 and batt < 144
char = 5
case batt => 144
char = 6
end select
return

...

if (temperature2/100) =>10 then
LcdOut $FE, $c0, "O:", Sign2, DEC (Temperature2 / 100), ".", DEC Temperature2 dig 1, 0 , " " , char ," ", dec TmpW dig 4,dec TmpW dig 3,",",dec TmpW dig 2
else
LcdOut $FE, $C0, "O:", Sign2, $14, DEC (Temperature2 / 100), ".", DEC Temperature2 dig 1, 0 , " ", char , " ", dec TmpW dig 4,dec TmpW dig 3,",",dec TmpW dig 2
endif

But I have on display just char # 1 ; do not change in # 2 to 5 ...
What I do wrong ? Thanks !