GCB Basic Locate 1,0 no second row. RESOLVED. Incorrect chip selected.

[Romtek]

sorry if I reply now but I've been busy, I'll try the program for the weekend, greetings

[Anobium]

No problem. I look forward to the test results.

[Romtek]

I tried it on mega8515, also adding this modification
#DEFINE LCD_SPEED 255 (signals compiler"code /constant lcd_speed equates to slow cannot reassigned to equate to 255 ....")
the result is the following:
20, 0, 0, 128

20, 1, 0, 128
see attached photo``

[Anobium]

Can you attach the following four file. 1. Source for PIC 2. ASM for PIC 3. Source for AVR 4. ASM for AVR

The 2nd value of 20, 1, 0, 128 should be 20, 1, 0, 192 - if the programs are the same. So, we are getting close to figuring out the root cause.

If you need to.. ZIP the four files and attach.

[Anobium]

And, change the line that was similar...
Make it read in both case.
Retest.

HSerPrint ((0x80 or 0x40 * LCDLine)+ LCDColumn)

This line of code is similar to the line of code in LCD.h. As the value that should 192 is 128 there has to be something going on with respect to the calculation - it may be maths precedence hence the new line of code above.

If this shows the correct values on both chips then I will change LCD.h to resolve on the LCD.

[Romtek]

I also tested on pic16f88 with

#DEFINE LCD_SPEED 255

and it works, from the serial the values are
20, 0, 0, 128

20, 1, 0, 192
now I send the files you asked for ......

[Romtek]

Sorry, (Preface for each test both 8515 and pic16f88 I connect 2x16 and also 4x16 lcds).
Let's recap: with the mega8515 all the changes have not led to the solution, i.e. the display shows (on the 2x16 lcd)
1.0
0

20, 0, 0, 128

20, 1, 0, 128
while on 4x16 lcd displays
1.0
0.1

20, 0, 0, 128

20, 1, 0, 128

I did the same tests on pic 16f88 and everything works.
Thanks for now

[Romtek]

I think it would be good to focus on mega8515 to see if it can fix it!!???

[Romtek]

I think it would be a good idea that when starting the program, before going to write on the lcd, pause for 500 mS

[Anobium]

OK. Add the following to the test programs. This is use this modified LOCATE sub. Test and report.

Add this at the bottom of your existing programs.

#DEFINE LOCATE MYLOCATE
Sub MYLOCATE (In LCDLine as Byte, In LCDColumn as Byte)
'Sub to locate the cursor
'Where LCDColumn is 0 to screen width-1, LCDLine is 0 to screen height-1

    Set LCD_RS Off
    If LCDLine > 1 Then
        LCDLine = LCDLine - 2
        LCDColumn = LCDColumn + LCD_WIDTH
    End If

    LCDWriteByte((0x80 or (0x40 * LCDLine))+ LCDColumn) 
    wait 5 10us
End Sub

[Romtek]

Sorry but I don't understand, I send you what I did on 8515 with the last change hoping it will help you .(in the file I commented the Mine part that works and Yours part that doesn't work )

[Anobium]

I am confused,

Please revert back the initial code with the locate 0,0 to locate 3,0. No mods with ,80 etc. We need to find the root cause. Then add the code I posted

#DEFINE LOCATE MYLOCATE
Sub MYLOCATE (In LCDLine as Byte, In LCDColumn as Byte)
'Sub to locate the cursor
'Where LCDColumn is 0 to screen width-1, LCDLine is 0 to screen height-1

    Set LCD_RS Off
    If LCDLine > 1 Then
        LCDLine = LCDLine - 2
        LCDColumn = LCDColumn + LCD_WIDTH
    End If

    LCDWriteByte((0x80 or (0x40 * LCDLine))+ LCDColumn) 
    wait 5 10us
End Sub

To get on the same page - attached is a new baseline.

Test and let me know what happens.

[Anobium]

This is what I am getting. See the picture.

i have tested on an UNO - that works great.

[Romtek]

Maybe I found the reason where I was wrong....
In the program I wrote:

chipmega8515, 4

while in reality the micro I'm using is an AT90S8515 8PI ,
I recommend using an ATMEGA8515.
I solved by putting

chip 90s8515, 4

and on the display (with PCF8574 i2c interface) it shows the writings correctly.
I still have the doubt that the library only manages 2-line displays and not 4-line ones, correct me if I'm wrong.
In fact, lines 3 and 4 now appear shifted.
Thank you all and patience for the replies.
I add that I'm using a 4 MHz quartz

;Chip Settings
'error not use #chip mega8515, 4
#chip 90s8515, 4

#include <pcf8574.h>
#option explicit


; ----- Define Hardware settings
   ' THIS CONFIG OF THE SERIAL PORT TO A PC TERMINAL via a TTL Converter
   ' USART settings
   #define USART_BAUD_RATE 19200 '!!!!!errore libreria velocita a 9600
   Dir PORTA.3 Out
   Dir PORTA.4 In
   #define USART_DELAY 10 ms
   #define USART_BLOCKING


   #define led PortB.0 ' up port b0
   Dir led Out ' out led

  ; ----- Define Hardware settings
  ' Define I2C settings - CHANGE PORTS
   #define I2C_MODE Master
   '#define I2C_DATA PORTB.0 'pin 25
   '#define I2C_CLOCK PORTB.1 'pin 24
   #define I2C_DATA PORTC.4 'pin 25
   #define I2C_CLOCK PORTC.3 'pin 24
   #define I2C_DISABLE_INTERRUPTS ON
   #define I2C_BIT_DELAY 0 us     '0
   #define I2C_CLOCK_DELAY 1 us   '1
   #define I2C_END_DELAY 0 us     '0
   #define LCD_IO 10
   #define LCD_I2C_Address_ 0x4E
  ' #define LCD_I2C_Address_1 0x4E

  '''Set up LCD
   'You may need to use SLOW or MEDIUM if your LCD is a slower device.
   '#define LCD_SPEED SLOW 'FAST
   '#define LCD_SPEED MEDIUM   
   #define LCD_SPEED FAST

   'led display.
   #define LCD_Backlight_On_State  1
   #define LCD_Backlight_Off_State 0


; ----- Quick Command Reference:

 '''Set LCD_10 to 10 for the YwRobot LCD1602 IIC V1 or the Sainsmart LCD_PIC I2C adapter
 '''Set LCD_10 to 12 for the Ywmjkdz I2C adapter with pot bent over top of chip

' variabili
'Dim yy As byte   'no use
'Dim xx As byte  'no use
'i =0

; ----- Main body of program commences here.
Inittimer1 OSC, PS_64
Starttimer 1
Settimer 1, 50 ;Preload Timer
On Interrupt Timer1Overflow Call Flash_LED

Sub Flash_LED
Settimer 1, 50 'Preload timer
   led=!led 'inverto led
   'pulseout led, 100 ms
End Sub
'--------------------------------------------------------------------------------------
    HSerPrint "test uart!!!!!!!!"
    HSerSend 13
    HSerSend 10

    'blink lcd
    LCDBacklight OFF
    WAIT 500 ms
    LCDBacklight ON
    CLS
    WAIT 500 ms


 Do Forever
    /*cls
    locate 0,0
    PRINT "DISPLAY ON 1 row"
    locate 0,40 '2row
    PRINT "DISPLAY ON 2 row"
    locate 0,16  '3 row
    PRINT "DISPLAY ON 3 row"
    locate 0,80 '4row
    PRINT "DISPLAY ON 4 row"
    wait 5 s
    */
    cls 

    locate 0,0
    PRINT "locate 0,0"
    Locate 1,0 '2 row
    PRINT "locate 1,0"
    Locate 2,0  '3row
    PRINT "locate 2,0"
    Locate 3,0 '4 row
    PRINT "locate 3,0 "
    wait 5 s

    loop


end

[Anobium]

oh dear.. yes, a waste of time re the chip.

The library works. We would have been told by our many 1000s of users.. if it did not.

[Romtek]

The fact remains that the same program on PIC16f88 4 MHZ
(i2c PCF8574) lines 3 and 4 are moved.
I can't explain it.
See listing.
Sorry for the previous error.

;Chip Settings
#chip 16F88,4

#include <pcf8574.h>
#option explicit


; ----- Define Hardware settings
   ' THIS CONFIG OF THE SERIAL PORT TO A PC TERMINAL via a TTL Converter
   ' USART settings
   #define USART_BAUD_RATE 19200 '
   Dir PORTA.3 Out
   Dir PORTA.4 In
   #define USART_DELAY 10 ms
   #define USART_BLOCKING


   #define led PortA.2 'up port b0
   Dir led Out ' out led

  ; ----- Define Hardware settings
  ' Define I2C settings - CHANGE PORTS
   #define I2C_MODE Master
   #define I2C_DATA PORTB.0 'pin 25
   #define I2C_CLOCK PORTB.1 'pin 24
   #define I2C_DISABLE_INTERRUPTS ON
   #define I2C_BIT_DELAY 0 us     '0
   #define I2C_CLOCK_DELAY 1 us   '1
   #define I2C_END_DELAY 0 us     '0
   #define LCD_IO 10
   '#define LCD_I2C_Address_ 0x4E
   #define LCD_I2C_Address_1 0x4E

  '''Set up LCD
   'You may need to use SLOW or MEDIUM if your LCD is a slower device.
   #define LCD_SPEED SLOW 
   '#define LCD_SPEED MEDIUM   
   '#define LCD_SPEED FAST

   'retro  display.
   #define LCD_Backlight_On_State  1
   #define LCD_Backlight_Off_State 0


; ----- Quick Command Reference:

 '''Set LCD_10 to 10 for the YwRobot LCD1602 IIC V1 or the Sainsmart LCD_PIC I2C adapter
 '''Set LCD_10 to 12 for the Ywmjkdz I2C adapter with pot bent over top of chip

' variabili
'Dim yy As byte  'no use
'Dim xx As byte  'no use
'i =0

; ----- Main body of program commences here.
Inittimer1 OSC, PS_64
Starttimer 1
Settimer 1, 50 ;Preload Timer
On Interrupt Timer1Overflow Call Flash_LED

Sub Flash_LED
Settimer 1, 50 'Preload timer
   led=!led 'blink led
   'pulseout led, 100 ms
End Sub
'--------------------------------------------------------------------------------------
    HSerPrint "twat uart 16f88"
    HSerSend 13
    HSerSend 10

    'blink
    LCDBacklight OFF
    WAIT 500 ms
    LCDBacklight ON
    CLS
    WAIT 500 ms


 Do Forever
    cls
    locate 0,0
    PRINT "DISPLAY ON 1 row"
    locate 0,40 '2 row
    PRINT "DISPLAY ON 2 row"
    locate 0,16  '3 row
    PRINT "DISPLAY ON 3 row"
    locate 0,80 '4 row
    PRINT "DISPLAY ON 4 row"
    wait 5 s

    cls 

    locate 0,0
    PRINT "locate 0,0"
    Locate 1,0 '2 row
    PRINT "locate 1,0"
    Locate 2,0  '3 row
    PRINT "locate 2,0"
    Locate 3,0 '4 row
    PRINT "locate 3,0 "
    wait 5 s

    loop


end

[Anobium]

We resolved that on Thursday. Go back through the posts.

[Romtek]

I don't know what solution you are referring to on Thursday.

1)Have you tried TO USE WITH (PCF8574) ON A 4 LINE DISPLAY??

2) did you see the photos I attached??

If you can kindly answer me thank you.

SORRY I INSIST BUT IF I DON'T KNOW WHERE I'M WRONG.

[Anobium]

1. Yes. It works fine.
2. Yes.

Attach your code please. ATTACH do not paste into a post.

[Romtek]

Thanks for your infinite patience, attached the file on 16f88

[Anobium]

Please add the geometry of the LCD. By set the LCD_WIDTH to 16

#DEFINE LCD_WIDTH 16

The only way I get your display is to set my width to 24. So, the memory map/addressing in the LCD is different? But, you said it worked with Arduino... my guess you set the geometry to 1604.

Try again and report please.

[Romtek]

Thanks thanks thanks, thanks again, Solved Solved!!!! (I shout it to the world :) )
So I tested it both on pic 16f88 and 90s8515 with 16x2 and 16x4 lcd
and displays the writings in the right position.
For those who have problems with placement of text on lines ( Locate 0,0 Locate 1,0 Locate 2,0 Locate 3,0) add the following command #DEFINE LCD_WIDTH 16 (which if I'm not mistaken defines lcd 16 characters)
Thank you all for your patience and time spent.
This experience has taught me not to leave anything to chance but to analyze point by point.
Thanks Anobium

[Romtek]

I attach the photo of the result

[Romtek]

I would recommend modifying the manual where the example of the lcd is shown. For beginners and beginners like me, normally if one copies the example (see online help page 404) and uses a 16x2 or 16x4 LCD, one finds himself with the same problem as me.
So I would add #DEFINE LCD_WIDTH 16 in the example since 16x2 lcds are commonly sold.
I hope with my post can help others, greetings thanks.

[Anobium]

Great to see you have it all operational.

---

Also, a great idea to improve the Help.

I will update the Help. Check the Help distributions later today for the revisions.

I have also updated a lot of the demos specifically related to LCD operations ( about 100 demos) to explicitly state #define LCD_WIDTH 20 ;specified lcd width for clarity only. 20 is the default width so the users will see this constant.

:-)

Enjoy