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Topic: [Solved] 2.4 TFT LCD shield - 0x4747 - SCREEN WHITE (Read 10224 times) previous topic - next topic

zahnd

Hi, I just bought 2.4 TFT LCD shield in CHINA
without any technical information
The screen is definitly WHITE
It seems the driver code is 0x4747
I already tried all solutions that I have found on internet
I haven't an high level on the subject ...

Can someone help me ?
Thankyou

david_prentice

#1
Aug 20, 2017, 08:00 pm Last Edit: Aug 20, 2017, 08:01 pm by david_prentice
Why not enter "TFT 0x4747" into the Search box at the top of your screen?   (magnifying glass icon)

Or post a link to the actual display that you have bought.

David.

zahnd

Hello David, Thank you for your advise :)
I did it ... and I just found a link to MCUFRIEND_kbd Library
I tried all examples included in that Library ... without success :(
I really don't know what to do, what to try, how to continue ?

I join 2 photos of my TFT LCD
and the reference of my order ....

Commande ID: 503389374309023  View Detail
Date et Heure commande: 16:18 Jul. 22 2017
Nom du vendeur: CF fengtaiElectronic Store
Montant de la commande:
€ 49,27 = € 3,01 X15
LCD module TFT 2.4 pouce TFT LCD écran pour Arduino UNO R3 Conseil et soutien mega 2560

Thank you for your help
Michel

david_prentice

A "link" means a website address or URL.   e.g. from an Ebay sale
Copy-pasting some French text is not very useful.

A website generally has photos of the front and back of a Shield.    I get most information from looking at the pcb traces and any printed words or numbers.

The "front" view of your screen looks like a regular 2.4" Mcufriend Uno Shield.
ID = 0x4747 means Himax HX8347-D controller.      These are not very common controllers.   So they are not supported by default.


1. install MCUFRIEND_kbv library from the Library Manager.
2. Edit MCUFRIEND_kbv.cpp:  #define SUPPORT_8347D

Please let us know how you get on.

Did you pay 49 Euros for one screen or for fifteen screens?

David.

skywatch


david_prentice

Well,  that sounds very cheap !

It would be interesting to hear if they put any protective packaging between each screen.
And even more interesting if all 15 TFT screens work.   And if all 15 Touch Panels work.

David.

zahnd

SUPER !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
THANK YOU VERY MUCH
The screen shows différents things :)))))))

I followed what you suggested to me :
1. Upload MCUFRIEND
2. Add #define SUPPORT_8347D at the first line of MCUFRIEND_kbv.cpp
3. Test example from the Library >> "readpixel", "aspect", "glue_demo
............... and it works !!!!!!!!!!!!!!

I am building a prototype with 15 screens
They will be put on a production line as visual mangement
For that, I just prepared 7 board in A4 format which can include from 1 to 4 screens
There is 1 board for each machine of the production line
First step : each board will just display a status RED/GREEN
Second step : I want connect the screen to the machine ....
If this prototype is OK, we will developpe this displaying in all the factory (500 screens) !!!

Again, thank you David for the time you gave me
The second photo and the link will arrive after this post


david_prentice

You do not need to add the define.

Simply find the existing define and remove the two slashes.

David.

zahnd

David
You are right : I did it, and it works perfectly :)


68gt500

Thanks David,

just fantastic !!

My 2.8 TFT shield (id: 4747) is working perfectly, because of you work!

Spend hours looking for a solution until you mentioned :

Quote
ID = 0x4747 means Himax HX8347-D controller.      These are not very common controllers.   So they are not supported by default.


1. install MCUFRIEND_kbv library from the Library Manager.
2. Edit MCUFRIEND_kbv.cpp:  #define SUPPORT_8347D
Greetings
Mike
 

stern

I also buyed these  TFT-shields.   yes, they are identified as 4747   and the driver  is HX8347D

the problem "white screen"  results from the  constant declaration of 4747   as  7575  in the  TFTLCD-library-master   and also in the  identification of the display-identifier.

the identifier must  directivily  be changed  in  0x7575  and  the display will run.  you only must take a mirror to read  :)     .

unfortunately there is no identification   like (ili9341)  pinted on the back of the shield. hx4747, I guess .

but searching 4747  or 7575    has no result everywhere. normaly the identification  must be 0x8347. but that´s  rubbish.

thank you .... of  certainty: to be not alone  :-D


david_prentice

#12
Dec 29, 2017, 01:15 am Last Edit: Dec 29, 2017, 01:21 am by david_prentice
HX8347-A ID=0x4747 in reg(0x67)
HX8347-B ID=0x9325 in reg(0x00)
HX8347-D ID=0x4747 in reg(0x00)
HX8347-G ID=0x7575 in reg(0x00)
HX8347-I ID=0x9595 in reg(0x00)

There are probably other HX8347 variants. 
-A, -D, -G, -I have 8-bit registers.   Hence you see double on a 8-bit bus. e.g. 0x9595 
-B has 16-bit registers.   
I have never seen a HX8347-B but I suppose it appears like an Ilitek ILI9325.

Himax specialise in using random registers with the same part number (with different behaviour).
Other manufacturers use a model number and revision letter for a specific model.

David.

stern

hallo david,

thanks for   helping.

my problem:  I have a coustom made code, running well with the ili9341 

I have basicly solved the problem with the hx8347, but  the screen is mirrored.


trying to correct this, I installed the  MCUFRIEND_kbv.--   but now the babylonian-speach-desaster will
make it more and more labourious  to get my code running.

the target:  where is it centraly possible to change  the display-coordinates in the adafruit tft-driver.  not the mcufriend_kbv.

if this is not simply...it´s better to buy some new displays with ili9341.

by the way:  no special hx8347-driver  can be found. 

stern

now I  particulary  solved the problem. 

the used driver ( adafruit_tftlcd)  is  working bad.

the chips from himax and ilitek are not different in the basic handling of display coordinates. 

there is a cruel programming in  tftlcd.cpp  controlling  the MADCTL reg8 .

sometimes there is  commented  //madctl    ...if ilixxxx , but   if 7575(himax   and normaly ist should  be id 4747  grummel)  there the setting of reg8 is otherwise handled in code  without comment  and really wrong values..... WHY?   

as I thought, its only one value that has to be changed  an the display  hx8347 x   is working as  ili9341,
but not in the own code. it is to be changed in the TFTLCD.CPP.

Code: [Select]
else if(driver == ID_7575) {

    uint8_t hi, lo;
    switch(rotation) {
     default: lo = 0   ; break;
     case 1 : lo = 0x60; break;
     case 2 : lo = 0xc0; break;
     case 3 : lo = 0xa0; break;
    }
    writeRegister8(   HX8347G_MEMACCESS      ,0x50);//direct value in reg8  0x50.  its an example!!!!, but it works!

and also here:

[code]
 if(driver == ID_7575) {

    uint8_t t;
    switch(rotation) {
     default: t = 0   ; break;
     case 1 : t = 0x60; break;
     case 2 : t = 0xc0; break;
     case 3 : t = 0xa0; break;
    }
    writeRegister8(HX8347G_MEMACCESS,0x50);


[/code]

may be, there are to change other parts of the code, but im first satisfied .  no more mirrored screen.

perhaps somebody can  explain the  reg8     madctl     0x50  means  bin: 1010000.....   101 does the inversion?    the datasheet(ili as hx) says x-y exchange, x-inverted.

but it dependend  from the own first code with first used  driver .....

even touch-points have some  problems....  there must be a place to change too.   
but these problems also exist between similare displays  from ilitec  ????????????????


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