Need help on LCD

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- 7th August 2008, 17:14
luminas

Need help on LCD

I got my PIC 18F2550 blink an LED, but I cannot write to LCD
LCD is working with other PIC, no hardware issue here
PIC 18F2550, Xtal 10 Mhz

This is my code

Code:

DEFINE OSC 10 DEFINE LCD_DREG PORTB ' LCD data port DEFINE LCD_DBIT 2 ' LCD data starting bit DEFINE LCD_RSREG PORTB ' LCD register select port DEFINE LCD_RSBIT 0 ' LCD register select bit DEFINE LCD_EREG PORTB ' LCD enable port DEFINE LCD_EBIT 1 ' LCD enable bit DEFINE LCD_BITS 4 ' LCD data bus size DEFINE LCD_LINES 2 ' Number lines on LCD DEFINE LCD_COMMANDUS 2000 ' Command delay time in us DEFINE LCD_DATAUS 50 ' Data delay time in us
- 7th August 2008, 17:31
skimask

Quote:

DEFINE LCD_DBIT 2 ' LCD data starting bit

Re-Read your PBP manual concerning LCD_DBIT
- 7th August 2008, 17:35
Archangel

Quote:

Originally Posted by luminas

I got my PIC 18F2550 blink an LED, but I cannot write to LCD
LCD is working with other PIC, no hardware issue here
PIC 18F2550, Xtal 10 Mhz

This is my code

Code:

ASM __CONFIG _CONFIG1L, _PLLDIV_10_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_1_1L __CONFIG _CONFIG1H, _FOSC_HS_1H __CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L & _VREGEN_OFF_2L __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_512_2H __CONFIG _CONFIG3H, _PBADEN_On_3H & _MCLRE_ON_3H & _CCP2MX_ON_3H __CONFIG _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L ENDASM DEFINE OSC 10 DEFINE LCD_DREG PORTB ' LCD data port DEFINE LCD_DBIT 2 ' LCD data starting bit <font color=red>not valid</font color> DEFINE LCD_RSREG PORTB ' LCD register select port DEFINE LCD_RSBIT 0 ' LCD register select bit DEFINE LCD_EREG PORTB ' LCD enable port DEFINE LCD_EBIT 1 ' LCD enable bit DEFINE LCD_BITS 4 ' LCD data bus size DEFINE LCD_LINES 2 ' Number lines on LCD DEFINE LCD_COMMANDUS 2000 ' Command delay time in us DEFINE LCD_DATAUS 50 ' Data delay time in us clear porta = 0 portb = 0 portc = 0 TRISA = %00000000 ' Set PORTA to all output TRISB = %00000000 ' Set PORTB to all output TRISC = %00000000 ' Set PORTC to all output main: LCDOUT $FE, 1 pause 100 LCDOUT $FE, 1, "Hello " pause 100 high porta.0 pause 1000 low porta.0 pause 1000 goto main

D bit should be 0 or 4, you cannot use 2 - 5 directly this way, Darrel did do a workaround however . . .
edit: Skimask was quicker on the draw . . .
- 7th August 2008, 17:58
luminas

Thanks for your comments :)

I changed the dbit to 4 , but nothing come out of the LCD , but LED is blinking
This is my first time working with 18F2550, is there any other mistake I made?

Code:

ASM __CONFIG _CONFIG1L, _PLLDIV_10_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_1_1L __CONFIG _CONFIG1H, _FOSC_HS_1H __CONFIG _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L & _VREGEN_OFF_2L __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_512_2H __CONFIG _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_ON_3H & _CCP2MX_ON_3H __CONFIG _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L ENDASM DEFINE OSC 10 DEFINE LCD_DREG PORTB ' LCD data port DEFINE LCD_DBIT 4 ' LCD data starting bit DEFINE LCD_RSREG PORTB ' LCD register select port DEFINE LCD_RSBIT 0 ' LCD register select bit DEFINE LCD_EREG PORTB ' LCD enable port DEFINE LCD_EBIT 1 ' LCD enable bit DEFINE LCD_BITS 4 ' LCD data bus size DEFINE LCD_LINES 2 ' Number lines on LCD DEFINE LCD_COMMANDUS 1500 ' Command delay time in us DEFINE LCD_DATAUS 44 ' Data delay time in us clear porta = 0 portb = 0 portc = 0 TRISA = %00000000 ' Set PORTA to all output TRISB = %00000000 ' Set PORTB to all output TRISC = %00000000 ' Set PORTC to all output main: LCDOUT $FE, 1 pause 100 LCDOUT $FE, 1, "Hello " pause 100 high porta.0 pause 1000 low porta.0 pause 1000 goto main
- 7th August 2008, 17:59
skimask

Quote:

Originally Posted by luminas

Thanks for your comments :)

I changed the dbit to 4 , but nothing come out of the LCD , but LED is blinking
This is my first time working with 18F2550, is there any other mistake I made?

Change the D-Bit all you want...
If you don't change the wiring that goes with it, it ain't gonna work...
- 7th August 2008, 18:27
luminas

Yes it works now

I forgot to change the wiring hahaha......
Now it works :) Thanks again..... have a nice day
- 8th August 2008, 00:42
Archangel

Quote:

Originally Posted by skimask

Change the D-Bit all you want...
If you don't change the wiring that goes with it, it ain't gonna work...

You know, I almost suggested that, but I thought naw, that would be rude . . . DOH!