Hi all,
I have the PICDEM 2Plus Demo Board 2006
and i started plaing with it, and now i'm tring to use the LCD dispaly
i only have the LCD inputs but not the commands
were can i find the LCD data sheet ?
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Hi all,
I have the PICDEM 2Plus Demo Board 2006
and i started plaing with it, and now i'm tring to use the LCD dispaly
i only have the LCD inputs but not the commands
were can i find the LCD data sheet ?
Standard Hitachi 44780 parallel LCD module, compatible with PicBasicPro LCDOUT commands. A Google search should give you some good hints on how to run that LCD.Quote:
Originally Posted by The IceMan
Thank you
now to the digging part
Do you know any tutarial using the LCD on the PICDEM Board with 16F877A ?
Are you actually using MeLabs PicBasic (or PicBasicPro)?..................................... ...Quote:
Originally Posted by The IceMan
Disregard earlier statement...didn't realize PicBasic doesn't have an LCDOUT command.
4 options as I see it
1)Dive into the datasheets and figure out the timing of the signals of the LCD modules
2)Search these forums for some premade examples (they're here somewhere)
3)Search the internet for some premade examples (they're out there somewhere)
4)Upgrade to PicBasicPro and be done with it...
From MeLabs website
http://melabs.com/resources/samples/x1/pbc/lcdx.basCode:' Demonstrate operation of an LCD in 4-bit mode
Symbol PORTD = 8 ' PORTD is register 8
Symbol PORTE = 9 ' PORTD is register 9
Symbol TRISD = $88 ' PORTD data direction is register hexadecimal 88
Symbol TRISE = $89 ' PORTD data direction is register hexadecimal 89
Symbol ADCON1 = $9f ' ADCON1 is register hexadecimal 9f
Poke ADCON1, 7 ' Set analog pins to digital
Poke TRISD, 0 ' Set all PORTD lines to output
Poke TRISE, 0 ' Set all PORTE lines to output
Poke PORTE, 0 ' Start with enable low
Pause 100 ' Wait for LCD to power up
Gosub lcdinit ' Initialize the lcd
loop: Gosub lcdclr ' Clear lcd screen
For B4 = 0 to 4 ' Send string to lcd one letter at a time
Lookup B4, ("Hello"), B2 ' Get letter from string
Gosub lcddata ' Send letter in B2 to lcd
Next B4
Pause 500 ' Wait .5 second
Gosub lcdclr ' Clear lcd screen
For B4 = 0 to 4 ' Send string to lcd one letter at a time
Lookup B4, ("world"), B2 ' Get letter from string
Gosub lcddata ' Send letter in B2 to lcd
Next B4
Pause 500 ' Wait .5 second
Goto loop ' Do it forever
' Subroutine to initialize the lcd - uses B2 and B3
lcdinit: Pause 15 ' Wait at least 15ms
Poke PORTD, $33 ' Initialize the lcd
Gosub lcdtog ' Toggle the lcd enable line
Pause 5 ' Wait at least 4.1ms
Poke PORTD, $33 ' Initialize the lcd
Gosub lcdtog ' Toggle the lcd enable line
Pause 1 ' Wait at least 100us
Poke PORTD, $33 ' Initialize the lcd
Gosub lcdtog ' Toggle the lcd enable line
Pause 1 ' Wait once more for good luck
Poke PORTD, $22 ' Put lcd into 4 bit mode
Gosub lcdtog ' Toggle the lcd enable line
B2 = $28 ' 4 bit mode, 2 lines, 5x7 font
Gosub lcdcom ' Send B2 to lcd
B2 = $0c ' Lcd display on, no cursor, no blink
Gosub lcdcom ' Send B2 to lcd
B2 = $06 ' Lcd entry mode set, increment, no shift
Goto lcdcom ' Exit through send lcd command
' Subroutine to clear the lcd screen - uses B2 and B3
lcdclr: B2 = 1 ' Set B2 to clear command and fall through to lcdcom
' Subroutine to send a command to the lcd - uses B2 and B3
lcdcom: Poke PORTE, 0 ' Set RS to command
lcdcd: B3 = B2 & $f0 ' Isolate top 4 bits
Poke PORTD, B3 ' Send upper 4 bits to lcd
Gosub lcdtog ' Toggle the lcd enable line
B3 = B2 * 16 ' Shift botton 4 bits up to top 4 bits
Poke PORTD, B3 ' Send lower 4 bits to lcd
Gosub lcdtog ' Toggle the lcd enable line
Pause 2 ' Wait 2ms for write to complete
Return
' Subroutine to send data to the lcd - uses B2 and B3
lcddata: Poke PORTE, 1 ' Set RS to data
Goto lcdcd
' Subroutine to toggle the lcd enable line
lcdtog: Peek PORTE, B0 ' Get current PORTE value
B0 = B0 | %00000010 ' Set lcd enable line high
Poke PORTE, B0
B0 = B0 & %11111101 ' Set lcd enable line low
Poke PORTE, B0
Return
'***************************** LCD Demo For The PICDEM 2 PLUS Board ********************************
' Device used pic16F877
' port.a1 LCD E enable input
' port.a2 LCD R/W read/write bit
' port.a3 LCD RS register select bit
' port.d0 LCD DB4 data port
' port.d1 LCD DB3 data port
' port.d2 LCD DB2 data port
' port.d3 LCD DB1 data port
'**************************** Hardware Setup ************************************************** ******
trisa = %11110001 ' Set port a I/O
trisb = %11111111 ' Set port b I/O
trisc = %10000000 ' Set port c I/O
trisd = %11110000 ' Set port d I/O
ADCON1 = %10000110 ' Set porta & porte as digital I/O
'*************************** Program Defines ************************************************** ******
DEFINE LCD_DREG PORTD ' Set LCD port
DEFINE LCD_DBIT 0 ' Set starting bit (0 or 4) if 4-bit buss
DEFINE LCD_RSREG PORTA ' Set LCD register select port
DEFINE LCD_RSBIT 3 ' Set LCD register select port bit
DEFINE LCD_EREG PORTA ' Set LCD enable port
DEFINE LCD_EBIT 1 ' Set LCD enable port bit
DEFINE LCD_BITS 4 ' Set LCD bus size 4 0r 8 bits
DEFINE LCD_LINES 2 ' Set number of lines on LCD
DEFINE LCD_COMMANDUS 2000 ' Set command delay time in usec
DEFINE LCD_DATAUS 50 ' Set data delat time in usec
'*************************** Presets ************************************************** **************
low porta.2 ' Set write bit
'**************************** Main Program ************************************************** ********
DisplayOut:
lcdout $FE,1,"It is easy to" ' Clear the LCD display,display first line message
lcdout $FE,$C0,"dislay a message." ' Display second line message
pause 1000
goto DisplayOut
end