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Banana Pi to HY070CTP-HD LCD (LVDS/RGB)

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zola  
hannan.khan replied at Thu Jan 29, 2015 06:06
https://github.com/LeMaker/fex_configuration/blob/master/fex/banana_pi_5lcd.fex

You didn't need to make any modifications?

zola  
Edited by zola at Thu Jan 29, 2015 15:26

I'm about to wire with the following schematic for RGB.
Is this what you used as well?

Banana Pi -> Haoyu
2 -> 3
3 -> 5
4 -> 7
5 -> 9
6 -> 11
7 -> 13
8 -> 15
9 -> 17
10 -> 19
11 -> 21
12 -> 23
13 -> 25
14 -> 27
16 -> 31
17 -> 33
18 -> 35
19 -> 37
20 -> 39
23 -> 36
24 -> 34
25 -> 32
26 -> 30
27 -> 28
28 -> 26
29 -> 24
30 -> 22
31 -> 20
32 -> 18
33 -> 16
34 -> 14
35 -> 12
36 -> 10
37 -> 8
39 -> 4
40 -> 2

I omitted the power pins because I am using external power.

Updated to reflect correct values.

i m out of place right now BUT the wiring is simple as long as u keep in mind that
on BPI
1  2
3  4
5  6

on LCD
1  6
2  5
3  4

AND be careful that on the Lcd board the 1st starts from the right side i.e. opposite of the white Dot... (atleast it was for me) do chk with multimeter or smething

zola  
Edited by zola at Thu Jan 29, 2015 21:24

I have picture but the colors are a bit off and there is some flicker. I'm not sure if it's a connection problem or if it could be software.
I have checked the pins with a multimeter and they seem to be all connected.

Does anyone know a good way to diagnose the connections?

Here is the fex I am using http://pastebin.com/xiymG1Rr. Touch screen is also not working.

in which OS?

Hey, everyone, I have ordered New Marsboard A20. This LCD ( HY070CTP-HD) seems to work directly with the Board if we use their default image for NAND. It will probably arrive by Monday. After testing, I will post the result.

In Banana Pi, I've had no success for Android.
For Lubuntu and Bananian, it is working (without touch) by using defualt fex of Lemaker 5" LCD.
As for Pin Config, I am attaching an image which shows the correct (as per my knowledge) wiring for RGB (BPi to HY070CTP-HD)
LCD_PC.PNG

One more thing: LCD0-IO3 is a GPIO (PH12). It can supply maximum 35mA-40mA, LCD consumes around 150-200mA, so, I recommend powering externally (GND Shorted) or from EXT-PORTS of Banana Pi.
Also, Backlight consumes around 250-300mA current, which can put load on the System. Here, I recommend powering externally, as well.

Just for future reference, if you want this LCD to work flawlessly, just replicate the Circuitry on Page 3 of SOM-A10&A20_SCH.pdf (It's open source, just look for it). Make your own PCB Board. All parts utilized here are easily available.

In Fex
Try changing lcd_io_cfg0 from 0 to 0x10000000. It changes the Clock Phase. By doing this, I got few lines on the Screen but nothing else.
Also try setting fb0_scaler_mode_enable to 0.

Embedded_DE replied at Thu Jan 29, 2015 23:51
Hey, everyone, I have ordered New Marsboard A20. This LCD ( HY070CTP-HD) seems to work directly with ...

yea stuck at almost the same place.... android doesnt work.... i tried to use the LCD.o/disp.o/hdmi.o from marsboard & olimex but couldnt get anything from it.... i hope someone with android understanding can give some input here

zola  
hannan.khan replied at Thu Jan 29, 2015 23:11
in which OS?

I tried in Bananian and Ubuntu.

I tried minimising the connections to the following:
Power, Ground
Clock
Data enable
Backlight/onoff

And the screen still flickers so I think it is a problem with the clock settings or clock connection

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