210s: problem with A70 display

Hi,

I bought a 210s coming with a H43 display. Now I want to replace this
display by an A70 display that I have from the Mini2440 (everything was
working fine). I changed the "friendlyarm.ini" file to LCD-Type = A70.
When starting the flash progress, the Line:
Touch Device: no 1-wire
LCD Type: A70(Manu)

But when linux starts, the touch display is not working. Even if I try 'cat
dev/input/event0' there is no response.

Does anyone of you has an idea whats wrong with the display/board?

Thanks and best regards
Ozzy

Hope your A70 LCD has TI chip (TS controller) and MCU for 1-wire
communication  too.
Then you just need to resold 4 resistors (0R,indeed they are simple wires)
as it's pointed in the Datasheet.
After this procedure on the screen must be:
Touch Device: 1-wire
LCD Type: A70(Auto)

Also there will be britness control available as the bonus.

I didn't do that yet, but plan in the future.

Hi,

thanks for your reply. Where can I find the information about the
controller and resistors? There is no hint in the AT070TN83 datasheet
available on the friendlyarm site. Could you provide more information about
it?

Best regards
Ozzy

Ok,

I found it in the Schematics. I'll have a look whether I have the right
display... (hope so)

Hi,

of course my A70 does not have a controller... So is there any chance to
get it work with the old display? Or is there any "upgrade" kit?

Best regards
Ozzy

I'm afraid, there is no solution. To get the touchscreen working, you must
connect the ends of TS resistors to the ADC either to SoC's S5PV210s
AIN0...AIN3 or to TS controller, which translate Y and X via I2C or 1-wire.

FriendlyARM's 1-wire is not standard, but it's simple to discover.
To work with 210s the best solution is to connect LCD via 1-wire and
onboard schematics.
Please look carefully, maybe they are there? I mean U5 and U6 ICs, as I
remember. You can find them on your H43 LCD. Moreover, maybe (or not)
accelerator sensor too.
Or use other pointer device, USB mouse, for instance.
Regards,

Hi,

>>Please look carefully, maybe they are there?<< Sorry, but I don't
understand what you mean... My A70 does not have these IC's. Is there a
possibility to "rebuild" the H43-PCB to connect the A70 display to it?

Best regards
Ozzy

Hi,
I meant U1 and U2 on the back side of the PCB.
U1 - is STC12LE4052 MCU which transfer TS data to SoC via 1-wire.
U2 - is IA7843 (or ADS7843 from Texas Instruments TS controller)
Remove R6, R7, R8, R9
Short (connect ends of) R11, R20, R21, R22.
I have old LCD produced 1044, that means 2010 year and 44 week and all
components are present.
I cannor suggest to rebuild PCB from H43
Regards,

Hi,

my A70 is produced 1002. I attached a picture of the pcb. But without the
ICs...

Best regards
Ozzy

Sorry,
my PCB has as on the picture attached...
One thing left to check: maybe the LCD own PCB which is connected to second
PCB with ribbon cable are the same for H43 and A70. Then it's possible to
disconnect H43 and connect A70.
But such experiments can damage it...

Regards,
Anatoly

Hi,

no, I think the modification is not possible. And I didn't find any site
where to buy only the pcb (especially from germany where there is no
reseller).

So I think I have to find a new display... But thanks for your response. So
if anyone wants to sell an A70 display ;-)

Best regards
Ozzy

Hi,

Sorry for my silly suggestion, but why do you want to spend energy on
making a similar PCB to H43, I mean, using 1-wire with same components ?
Why don't you try to connect the resistors to the SOC's ADC, I think the
driver is already present in the kernel.

Regards
Screwface

Hi,

that's right; I will try this first.

Best regards
Ozzy

Hi,

looking at the datasheet I noticed that ADC0 is connected to the the
adjustable resistor and not routed to the CON6 GPIO interface. So I think
that might be a small 'challange'...

Hello friends)) 
Please give me instruction (connect to devices and so on ...) to use the
A70 display

dsfaaaaaaaaaaaaaaaaaaaaaaaaaaa