Thanks Steve.
your assistance is great.
Ambrogio
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Re: I2C lcd ( arduino ) with PICBASIC, help
Thanks Steve.
your assistance is great.
Ambrogio
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Re: I2C lcd ( arduino ) with PICBASIC, help
This is the code to initialise the LCD and send Test. It does not use the LCD_Buff features. Obviously you need to check the OSC and DEFINEs as usual. I do expect this not to work first time!
Code:DEFINE OSC 40 ' 10 MHz XTAL AND X 4 INTERNAL PLL DEFINE I2C_SLOW 1 SDA VAR PORTD.2 ; I2C Data pin SCL VAR PORTD.3 ; I2C Clock Pin LCD_Addr CON 78 'LCD_BuffSize CON 30 'LCD_Buff VAR BYTE[LCD_BuffSize] 'LCD_BuffAddr CON EXT : @LCD_BuffAddr = _LCD_Buff 'LCD_BuffLen VAR WORD ; Length of data in buffer LCD_Data VAR BYTE ; Data to Send to LCD LCD_Byte VAR BYTE ; Nibbles to Send LCD_RS VAR LCD_Byte.0 ; Register Select bit LCD_RW VAR LCD_Byte.1 ; Read/Write bit LCD_E VAR LCD_Byte.2 ; Enable bit LCD_BackLight VAR LCD_Byte.3 ; Backlight 0=ON LCD_WriteMode VAR BYTE ; 1=LowNibble, 2=HighNibble, 3=Both LCD_CommandMode VAR BIT ; Indicates next byte is a command LCD_Byte2 VAR BYTE ; Same nibble without E bit LCD_Idx VAR BYTE testmode var byte ;----[Initialize the LCD]------------------------------------------------------- PAUSE 250 ; LCD Power-on delay LCD_Backlight = 1 ; Backlight OFF LCD_RW = 0 ; Write to LCD LCD_RS = 0 ; Command Register LCD_WriteMode = 1 ;-- Low Nibbles only LCD_Data = 3 ; Reset 3 times gosub LCD_Write_ PAUSEUS 6000 gosub LCD_Write_ PAUSEUS 1000 gosub LCD_Write_ PAUSEUS 1000 LCD_Data = 2 ; Start 4-bit mode gosub LCD_Write_ PAUSEUS 1000 LCD_WriteMode = 3 ;-- Both Nibbles LCD_Data = $28 gosub LCD_Write_ ; Function Set, 4-bit, 2-line, 5x7 LCD_Data = $0C gosub LCD_Write_ ; Display ON LCD_Data = $01 gosub LCD_Write_ ; Clear Screen PAUSE 2 LCD_Data = $06 gosub LCD_Write_ ; Entry Mode PAUSE 2 ; Let command finish goto main LCD_WRITE_: LCD_E = 1 IF LCD_WriteMode.1 = 1 THEN ; Write High Nibble LCD_Byte = (LCD_Byte & $0F) | (LCD_Data & $F0) LCD_Byte2 = LCD_Byte & $FB I2CWRITE SDA,SCL, LCD_Addr,[LCD_Byte, LCD_Byte2] ENDIF IF LCD_WriteMode.0 = 1 THEN ; Write Low Nibble LCD_Byte = (LCD_Byte & $0F) | ((LCD_Data << 4 )& $F0) LCD_Byte2 = LCD_Byte & $FB I2CWRITE SDA,SCL, LCD_Addr,[LCD_Byte, LCD_Byte2] ENDIF return Main: LCD_Data = "T" gosub LCD_Write_ LCD_Data = "e" gosub LCD_Write_ LCD_Data = "s" gosub LCD_Write_ LCD_Data = "t" gosub LCD_Write_ goto main
Steve Earl www.datageo.co.uk
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Re: I2C lcd ( arduino ) with PICBASIC, help
Steve,
Thanks a lot for the intersest.
It does not work. I added the bck_lt flashing in the main loop just to see if the communication is good > the bck_lt comes ond goes correctly.
I am attaching the whole program
Ambrogio
'************************************************* ***************
'* Name : RKPK40 board pic18F452 40 MHz *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2014 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 23/06/2014 *
'* Version : 1.0 *
'* Notes : *
'* : *
'************************************************* ***************
';Program Configuration Register 1H
@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HSPLL_OSC_1H
';Program Configuration Register 2L
@ __CONFIG _CONFIG2L, _BOR_OFF_2L & _BORV_20_2L & _PWRT_ON_2L
';Program Configuration Register 2H
@ __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_128_2H
';Program Configuration Register 3H
@ __CONFIG _CONFIG3H, _CCP2MX_OFF_3H
';Program Configuration Register 4L
@ __CONFIG _CONFIG4L, _STVR_OFF_4L & _LVP_OFF_4L & _DEBUG_OFF_4L
';Program Configuration Register 5L
@ __CONFIG _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L & _CP2_OFF_5L & _CP3_OFF_5L
';Program Configuration Register 5H
@ __CONFIG _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H
';Program Configuration Register 6L
@ __CONFIG _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L & _WRT2_OFF_6L & _WRT3_OFF_6L
';Program Configuration Register 6H
@ __CONFIG _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H
';Program Configuration Register 7L
@ __CONFIG _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L & _EBTR2_OFF_7L & _EBTR3_OFF_7L
';Program Configuration Register 7H
@ __CONFIG _CONFIG7H, _EBTRB_OFF_7H
DEFINE OSC 40 ' 10 MHz XTAL AND X 4 INTERNAL PLL
DEFINE I2C_SLOW 1
SDA VAR PORTD.2 ; I2C Data pin
SCL VAR PORTD.3 ; I2C Clock Pin
LCD_Addr CON 78
'LCD_BuffSize CON 30
'LCD_Buff VAR BYTE[LCD_BuffSize]
'LCD_BuffAddr CON EXT : @LCD_BuffAddr = _LCD_Buff
'LCD_BuffLen VAR WORD ; Length of data in buffer
LCD_Data VAR BYTE ; Data to Send to LCD
LCD_Byte VAR BYTE ; Nibbles to Send
LCD_RS VAR LCD_Byte.0 ; Register Select bit
LCD_RW VAR LCD_Byte.1 ; Read/Write bit
LCD_E VAR LCD_Byte.2 ; Enable bit
LCD_BackLight VAR LCD_Byte.3 ; Backlight 0=ON
LCD_WriteMode VAR BYTE ; 1=LowNibble, 2=HighNibble, 3=Both
LCD_CommandMode VAR BIT ; Indicates next byte is a command
LCD_Byte2 VAR BYTE ; Same nibble without E bit
LCD_Idx VAR BYTE
testmode var byte
;----[Initialize the LCD]-------------------------------------------------------
PAUSE 250 ; LCD Power-on delay
LCD_Backlight = 1 ; Backlight OFF
LCD_RW = 0 ; Write to LCD
LCD_RS = 0 ; Command Register
LCD_WriteMode = 1 ;-- Low Nibbles only
LCD_Data = 3 ; Reset 3 times
gosub LCD_Write_
PAUSEUS 6000
gosub LCD_Write_
PAUSEUS 1000
gosub LCD_Write_
PAUSEUS 1000
LCD_Data = 2 ; Start 4-bit mode
gosub LCD_Write_
PAUSEUS 1000
LCD_WriteMode = 3 ;-- Both Nibbles
LCD_Data = $28
gosub LCD_Write_ ; Function Set, 4-bit, 2-line, 5x7
LCD_Data = $0C
gosub LCD_Write_ ; Display ON
LCD_Data = $01
gosub LCD_Write_ ; Clear Screen
PAUSE 2
LCD_Data = $06
gosub LCD_Write_ ; Entry Mode
PAUSE 2 ; Let command finish
goto main
LCD_WRITE_:
LCD_E = 1
IF LCD_WriteMode.1 = 1 THEN ; Write High Nibble
LCD_Byte = (LCD_Byte & $0F) | (LCD_Data & $F0)
LCD_Byte2 = LCD_Byte & $FB
I2CWRITE SDA,SCL, LCD_Addr,[LCD_Byte, LCD_Byte2]
ENDIF
IF LCD_WriteMode.0 = 1 THEN ; Write Low Nibble
LCD_Byte = (LCD_Byte & $0F) | ((LCD_Data << 4 )& $F0)
LCD_Byte2 = LCD_Byte & $FB
I2CWRITE SDA,SCL, LCD_Addr,[LCD_Byte, LCD_Byte2]
ENDIF
return
Main:
LCD_Data = "T"
gosub LCD_Write_
LCD_Data = "e"
gosub LCD_Write_
LCD_Data = "s"
gosub LCD_Write_
LCD_Data = "t"
gosub LCD_Write_
pause 5000
i2cwrite sda, scl, LCD_addr, [0] ' back_lt blinking
pause 1000
i2cwrite sda, scl, LCD_Addr,[%00010000]
pause 1000
goto main
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Re: I2C lcd ( arduino ) with PICBASIC, help
I over simplified the program!Originally Posted by iw2fvo
need to add this line
LCD_RS = 1 ' this is data highlighted in red above. This switches from command mode to data. It was in command mode that is why your back_lt instructions worked. An excellent clue for me.
I am not sure about these lines
LCD_Data = $28
gosub LCD_Write_ ; Function Set, 4-bit, 2-line, 5x7
and what the location addresses are to position the cursor at the beginning of each line.
Have you a datasheet for this LCD?
When this simple example is working we can add Command/Data switching which we will obviously need to have. I will follow Darrel's method as close as possible, he uses $FE to indicate the next byte is a command and switches to command mode for one byte then back to data.
Plenty for me to think about.
Steve Earl www.datageo.co.uk
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Re: I2C lcd ( arduino ) with PICBASIC, help
Steve,
I have checked the PCF to LCD connection :
bit0 = RS
bit1 =RW
bit2 =EN
bit3 =bck_lt
bit4 =D4
bit5 =D5
bit6 =D6
bit7 =D7
D0 to D3 of the LCD : there is no connection at all.
Regards,
Ambrogio
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Re: I2C lcd ( arduino ) with PICBASIC, help
Steve,
the display has 20 chrs X 4 lines.
Thanks,
Ambrogio
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Re: I2C lcd ( arduino ) with PICBASIC, help
the ext modifier should help
lcdb VAR BYTE[22]
ASM
lcd_cmd = _lcdb
lcd_buff = _lcdb+2
ENDASM
these must be after the asm code
lcd_cmd var byte EXT
lcd_buff var byte EXT
lcdb[0]=$fe
lcdb[1]= your lcd command eg 1 $80 $c0
use arraywrite to load lcd_buff (max 20 chrs)
then you can pass
lcd_cmd to your lcd write code if you need to send a cmd with your lcd string
or pass lcd_buff if no cmd required
ps don't forget to add a dely after a cmd to give the lcd time to act
ps ps
the asm names are case sensitive
left a bit out
lcd_cmd var byte EXT
lcd_buff var byte EXT
not sure if it needs to be try it and see
lcd_cmd var byte[2] EXT
lcd_buff var byte[20] EXT
Last edited by richard; - 17th July 2014 at 08:53. Reason: typo's
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Re: I2C lcd ( arduino ) with PICBASIC, help
Ambrogio is using pbp2.5 and I am even older on 2.46.Steve,
the point is that I do not have PBP_3.
My pbp is 2.50 B.
No arraywrite or read, no usercommand ... are available to me .
Thanks
Ambrogio
Steve Earl www.datageo.co.uk
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Re: I2C lcd ( arduino ) with PICBASIC, help
without arraywrite that's a lot of code
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Re: I2C lcd ( arduino ) with PICBASIC, help
and a lot more fun!
I am only along for the ride and to keep my brain ticking over.
Steve Earl www.datageo.co.uk
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Re: I2C lcd ( arduino ) with PICBASIC, help
does 2.5 have the dig command
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Re: I2C lcd ( arduino ) with PICBASIC, help
The DIG modifier has been there forever....
Dave Purola,
N8NTA
EN82fn
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Re: I2C lcd ( arduino ) with PICBASIC, help
Thanks to all of you for the assistance.
What is the dig modifier please ?
Thnaks
Ambrogio
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