I2C lcd ( arduino ) with PICBASIC, help - Page 3


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  1. #81
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Steve, very good result !
    I think It will help a lot of people too .
    I am wait to receive the item ( about 20 days ).
    Could you please post the code : I will start to study it .
    Thanks
    Ambrogio

  2. #82
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Quote Originally Posted by iw2fvo View Post
    Steve, very good result !
    I think It will help a lot of people too .
    I am wait to receive the item ( about 20 days ).
    Could you please post the code : I will start to study it .
    Thanks
    Ambrogio
    Here it is. This is a simple test program for PBP2.5 or lower. Anything you do not understand please ask. The next step is to include the command selection inside the LCD_WRITE subroutine.
    Code:
    '****************************************************************
    '*  Name    : I2CLCD.BAS                                                                 
    '*  Author  : Steve Earl                                                                                  
    '*  Notice  : Copyright (c) 2014 [select VIEW...EDITOR OPTIONS]                     
    '*          : All Rights Reserved                                                                         
    '*  Date    : 17/07/2014                                                                                
    '*  Version : 1.0                                                                                            
    '*  Notes   : Serial I2C LCD using PBP 2.5                                                       
    '*          : PCF8574T I2C port expander 20x4 LCD         
    '****************************************************************
    
    define OSC 40     ' set the correct speed here!!
    'DEFINE I2C_SLOW 1
    SDA         VAR PORTD.2       ; I2C Data pin
    SCL         VAR PORTD.3       ; I2C Clock Pin
    LCD_Addr CON 78               ; PCF8574T address
    
    '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 1=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
    seconds var byte
    minutes var byte
    hours   var byte
    
    Init:
    ;----[Initialize the LCD]-------------------------------------------------------
    PAUSE 250                           ; LCD Power-on delay
    LCD_Backlight = 1                   ; Backlight On
    LCD_RW = 0                          ; Write to LCD
    LCD_RS = 0                          ; Command Register
    
    LCD_WriteMode = 1                   ;-- Low Nibbles only
    LCD_Data = 3                        ; Software 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 50
    LCD_Data = $06 : gosub LCD_Write    ; Entry Mode
    PAUSE 2                             ; Let command finish
    LCD_RS = 1                          ;Switch to Data 
    ;Print Static Background to LCD
    LCD_Data = " " : gosub LCD_Write    ;Line 1
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write 
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = "S" : gosub LCD_Write 
    LCD_Data = "t" : gosub LCD_Write
    LCD_Data = "e" : gosub LCD_Write
    LCD_Data = "v" : gosub LCD_Write
    LCD_Data = "e" : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write 
    LCD_Data = "E" : gosub LCD_Write
    LCD_Data = "a" : gosub LCD_Write
    LCD_Data = "r" : gosub LCD_Write
    LCD_Data = "l" : gosub LCD_Write
    
    lcd_rs = 0                          ;Command is next
    lcd_data=$a8 : gosub lcd_write      ;Move to start of line 2
    pause 2
    lcd_rs = 1                          ;Switch back to Data
    
    LCD_Data = " " : gosub LCD_Write    ;Line 2
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = "D" : gosub LCD_Write 
    LCD_Data = "a" : gosub LCD_Write
    LCD_Data = "t" : gosub LCD_Write
    LCD_Data = "a" : gosub LCD_Write
    LCD_Data = "g" : gosub LCD_Write
    LCD_Data = "e" : gosub LCD_Write
    LCD_Data = "o" : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = "L" : gosub LCD_Write
    LCD_Data = "i" : gosub LCD_Write
    LCD_Data = "m" : gosub LCD_Write
    LCD_Data = "i" : gosub LCD_Write
    LCD_Data = "t" : gosub LCD_Write
    LCD_Data = "e" : gosub LCD_Write
    LCD_Data = "d" : gosub LCD_Write
    
    lcd_rs = 0                          ;Command is next
    lcd_data=$99 : gosub lcd_write      ;Move to line 3 col 6 
    pause 2
    lcd_rs = 1                          ;Switch back to Data
    
    LCD_Data = "*" : gosub LCD_Write    ;Line 3
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write 
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    LCD_Data = "*" : gosub LCD_Write
    
    
    lcd_rs = 0                          ;Command is next
    lcd_data=$D8 : gosub lcd_write      ;Move to line 4 col 5
    pause 2
    lcd_rs = 1                          ;Switch back to Data
    
    LCD_Data = "T" : gosub LCD_Write    ;Line 4
    LCD_Data = "e" : gosub LCD_Write
    LCD_Data = "s" : gosub LCD_Write
    LCD_Data = "t" : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = "P" : gosub LCD_Write 
    LCD_Data = "r" : gosub LCD_Write
    LCD_Data = "o" : gosub LCD_Write
    LCD_Data = "g" : gosub LCD_Write
    LCD_Data = "r" : gosub LCD_Write
    LCD_Data = "a" : gosub LCD_Write
    LCD_Data = "m" : gosub LCD_Write
    
    pause 5000
    lcd_rs = 0                          ;Command is next
    lcd_data=$D8 : gosub lcd_write      ;Move to line 4 col 5
    pause 2
    lcd_rs = 1                          ;Switch back to Data
    
    LCD_Data = " " : gosub LCD_Write    ;Clear line 4 and set clock 
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = ":" : gosub LCD_Write
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = ":" : gosub LCD_Write 
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = "0" : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write
    LCD_Data = " " : gosub LCD_Write
    
    main:                               ;Count seconds and refresh the clock
    for hours = 0 to 23
    for minutes = 0 to 59
    for seconds = 0 to 59  
    lcd_rs = 0                          ;Command is next
    lcd_data=$DA : gosub lcd_write      ;Move to line 4 col 7
    pause 2
    lcd_rs = 1                          ;Switch back to Data
    
    LCD_Data = (hours dig 1)+48 : gosub LCD_Write 
    LCD_Data = (hours dig 0)+48 : gosub LCD_Write
    LCD_Data = ":" : gosub LCD_Write
    LCD_Data = (minutes dig 1)+48 : gosub LCD_Write 
    LCD_Data = (minutes dig 0)+48 : gosub LCD_Write
    LCD_Data = ":" : gosub LCD_Write
    LCD_Data = (seconds dig 1)+48 : gosub LCD_Write 
    LCD_Data = (seconds dig 0)+48 : gosub LCD_Write
    pause 1000
    next    ;second
    next    ;minute
    next    ;hour
    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

  3. #83
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Ambrogio,

    Any feedback?

    If you have no questions then I will post the next improvement which includes the command in the LCD_Write subroutine. I am now looking at using arrays as the next step.

  4. #84
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Quote Originally Posted by EarlyBird2 View Post
    Ambrogio,

    Any feedback?

    If you have no questions then I will post the next improvement which includes the command in the LCD_Write subroutine. I am now looking at using arrays as the next step.
    Here it is! including LOOKUP and ARRAYs.

    Code:
    '****************************************************************
    '*  Name    : I2CLCD.BAS                                        *
    '*  Author  : Steve Earl                                        *
    '*  Notice  : Copyright (c) 2014 [select VIEW...EDITOR OPTIONS] *
    '*          : All Rights Reserved                               *
    '*  Date    : 17/07/2014                                        *
    '*  Version : 1.0                                               *
    '*  Notes   : Serial I2C LCD using PBP 2.5                      *
    '*          : PCF8574T I2C port expander 20x4 LCD               *
    '****************************************************************
    
    define OSC 40     ' set the correct speed here!!
    'DEFINE I2C_SLOW 1
    SDA         VAR PORTD.2       ; I2C Data pin
    SCL         VAR PORTD.3       ; I2C Clock Pin
    LCD_Addr CON 78               ; PCF8574T address
    LCD_Line_1 con $80
    LCD_Line_2 con $A8
    LCD_Line_3 con $94
    LCD_Line_4 con $D4
    LCD_BuffSize    CON 22
    
    LCD_Buff        VAR BYTE[LCD_BuffSize]
    'LCD_BuffAddr    CON EXT : @LCD_BuffAddr = _LCD_Buff
    LCD_BuffLen     VAR byte        ; 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 1=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
    
    
    seconds var byte
    minutes var byte
    hours   var byte
    
    Init:
    ;----[Initialize the LCD]-------------------------------------------------------
    PAUSE 250                           ; LCD Power-on delay
    LCD_Backlight = 1                   ; Backlight On
    LCD_RW = 0                          ; Write to LCD
    LCD_RS = 0                          ; Command Register
    LCD_WriteMode = 1                   ;-- Low Nibbles only
    LCD_Data = 3                        ; Software 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_buff[0] = $28                   ; Function Set, 4-bit, 2-line
    LCD_buff[1] = $0C                   ; Display ON
    LCD_buff[2] = $FE 
    LCD_buff[3] = $06                   ; Entry Mode
    LCD_buff[4] = $FE 
    LCD_buff[5] = $01                   ; Clear Screen
    lcd_bufflen = 6
    gosub LCD_Buff_Write
    
    ;Print Static Background to LCD
    for lcd_idx = 0 to 85
                   ;|                    | 20 characters
    lookup lcd_idx,["     Steve Earl     ",_            ;20
     $FE,lcd_line_2,"   Datageo Limited  ",_            ;+22 = 42
     $FE,lcd_line_3,"     **********     ",_            ;+22 = 64
     $FE,lcd_line_4,"      00:00:00      "],lcd_data    ;+22 = 86  (0-85)
     gosub lcd_write
    next
    
    ;Set up fixed buffer characters
    lcd_bufflen = 10                     ;8 characters in clock + $FE + LCD_Line
    LCD_buff[0] = $FE                   ;Command is next
    LCD_buff[1] = lcd_line_4 + 6        ;Move to line 4 col 7
    LCD_buff[4] = ":"                   ;Fixed characters
    LCD_buff[7] = ":"                   ;       "
    main:                               ;Count seconds and refresh the clock
    for hours = 0 to 23
        for minutes = 0 to 59
            for seconds = 0 to 59  
                LCD_buff[2] = (hours dig 1)+48  
                LCD_buff[3] = (hours dig 0)+48 
                LCD_buff[5] = (minutes dig 1)+48 
                LCD_buff[6] = (minutes dig 0)+48 
                LCD_buff[8] = (seconds dig 1)+48 
                LCD_buff[9]= (seconds dig 0)+48 
                gosub lcd_buff_write
                pause 1000
            next    ;second
        next    ;minute
    next    ;hour
    goto main
    
    LCD_WRITE:
    if lcd_data = $FE then
        lcd_commandMode = 1                 ;Next byte Command
        lcd_rs = 0                          ;Switch to Command Register
    else                                              
        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
        if lcd_commandmode then
         lcd_commandmode = 0              ;Reset to data
         lcd_rs = 1                       ;Switch to Data Register
         pause 2
        endif
    endif
    return
    
    Lcd_Buff_Write:
     for lcd_idx = 0 to lcd_bufflen - 1
      lcd_data=lcd_buff[LCD_idx]
      gosub LCD_Write
     next
    return

  5. #85
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Steve,
    I am sorry for the delayed reply : I am not at home on those days.
    I had a look to your code : it is a good work and I am waiting to check it soon when the hardware is arrived .
    Thanks a lot for the assistance.
    I think your work will help a lot of people .
    Regards,
    Ambrogio

  6. #86
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Quote Originally Posted by iw2fvo View Post
    Steve,
    I am sorry for the delayed reply : I am not at home on those days.
    I had a look to your code : it is a good work and I am waiting to check it soon when the hardware is arrived .
    Thanks a lot for the assistance.
    I think your work will help a lot of people .
    Regards,
    Ambrogio
    You are welcome. More is on the way as I am now investigating embedded strings.

  7. #87
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    I tried using the on board EEPROM by using DATA and READ.

    DATA "This is a string",0

    but it stores only alternate characters. I was surprised it worked at all but the alternate characters? There has to be a reason for it to work this way.

  8. #88
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Quote Originally Posted by EarlyBird2 View Post
    I tried using the on board EEPROM by using DATA and READ.

    DATA "This is a string",0

    but it stores only alternate characters. I was surprised it worked at all but the alternate characters? There has to be a reason for it to work this way.
    It looks like this was fixed back in 2010.

    http://www.picbasic.co.uk/forum/showthread.php?t=12775

    My PBP2.46 is from 2005.

  9. #89
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Quote Originally Posted by EarlyBird2 View Post
    It looks like this was fixed back in 2010.

    http://www.picbasic.co.uk/forum/showthread.php?t=12775

    My PBP2.46 is from 2005.
    The plot thickens! Here is an extract from this thread http://www.picbasic.co.uk/forum/show...7143#post97143 using DATA with strings and it works.

    Quote Originally Posted by dan-tron View Post
    EUREKA!
    Thanks guys! You have been a huge help. I have finally figured it out.
    My problem was more like 3 problems...

    1. I have never done EEPROM stuff before so I was lost to begin with.
    2. As Bruce pointed out, the mathematical order of operations in one line was not correct. I guess the BS2 thinks a little differently from PBP in that respect.
    3. My PicBasic Pro compiler was Version 2.30 form 2000. It seems that v2.30 supports the PIC 16F628 but the PIC 16F628A was implemented in a later version. I have upgraded my PBP to version 2.47 and now the EEPROM features work correctly on the 16F628A. When I successfully tested a 16F84A using the same code, that lead me to question the compiler.

    So for future generations and the benefit of other people like me, here's my WORKING code that is tested successfully on a PIC 16F628A with a 20MHz resonator compiled using PBP v2.47. It reads data from the Parallax RFID Reader Module, compares it against known values stored in EEPROM and allows or denies access accordingly. Enjoy.

    Code:
    CMCON = 7   
    DEFINE OSC 20	'Set oscillator in MHz
    
    ' -----[ Variables ]-------------------------------------------------------
    
    buf	VAR	Byte(10)	' RFID bytes buffer
    tagNum	VAR	Byte	' from EEPROM table
    idx	VAR	Byte	' tag byte index
    char	VAR	Byte	' character from table
    
    ' -----[ EEPROM Data ]-----------------------------------------------------
    
    Tag1	DATA	"100050A4B7"
    Tag2	DATA	"1000508E0A"
    Tag3	DATA	"10005091DC"
    Tag4	DATA	"100050203A"
    Tag5	DATA	"100050DA36"
    
    ' -----[ Initialization ]--------------------------------------------------
    
    HIGH portb.3	' turn off RFID reader
    LOW portb.6	' lock the door!
    Low portb.4	'Turn off LED
    
    ' -----[ Program Code ]----------------------------------------------------
    
    Main:
    
    LOW portb.3				' activate the reader
    SERIN2 portb.2, 396, [WAIT($0A), STR buf\10]	' wait for hdr + ID
    HIGH portb.3				' deactivate reader
    
    Check_List:
      FOR tagNum = 1 to 5			' scan through known tags
        FOR idx = 0 TO 9				' scan bytes in tag
        READ (((tagNum-1) * 10) + idx), char		' get tag data from table
        IF (char <> buf(idx)) THEN Bad_Char		' compare tag to table
        NEXT
        GOTO Tag_Found				' all bytes match!
    Bad_Char:					' try next tag
      NEXT
    
    Bad_Tag:
      tagNum = 0
      FREQOUT portb.5, 1000 */ $100, 115 */ $100	' groan
      PAUSE 1000
      GOTO Main
    
    Tag_Found:
      HIGH portb.6				' remove latch
      High portb.4				' Light LED
      FREQOUT portb.5, 2000 */ $100, 880 */$100	' beep
      LOW portb.6				' restore latch
      Low portb.4				' LED OFF
      GOTO Main

  10. #90
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Ambrogio

    After more testing of the DATA command I have come to the conclusion that my very old setup is the cause. I have PBP2.46 and MCSP from ten years ago. Looking at my old code, ten years old, I used WRITE not DATA and I now believe that was because DATA never worked. I wrote a routine just to write to the EEPROM followed by the program fortunately my set up did not overwrite the EEPROM when the PIC was reprogramed, Bruce's FlashLab boards continue to perform flawlessly.

    There are three options for the screen setup

    1 LOOKUP
    2 Embedded string
    3 EEPROM

    They all work but LOOKUP uses most code space and EEPROM the least.

  11. #91
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Steve,
    I am very interested in test the programs but I am still waiting to receive the PCF expander.
    It will arrive here after my summer holidays. I will let you know.
    Thanks for all.
    Regards,
    Ambrogio

  12. #92
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Ciao Ambrogio,

    take a look here ... could help!

    http://www.protonbasic.co.uk/showthr...ck-on-1602-LCD

    Leo
    Leo

  13. #93
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    Default Re: I2C lcd ( arduino ) with PICBASIC, help

    Thanks to all of you in this forum for the assistance.
    I am having problem with my healt in this last period of time. I had an important surgery.
    I hope to be active again.
    Ambrogio
    IW2FVO

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