Swapping bit pattern in 18 bit LCD running on Andorid

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Last Post 23 Jul 2014 03:34 AM by Misbah khan

Swapping bit pattern in 18 bit LCD running on Andorid

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Misbah khan

New Member
Posts:4

20 Jul 2014 06:29 AM

Hello.

I am working on custom board that has 18 bit LCD connection interface. Android is running on the board.

There are four columns in given below table. Column no 1 and 2 shows the standard connectivity between processor and LCD connector . Column no 1 & 3 represents the standard connectivity for an 18 bit LCDwhich is made for 18 bit operation by removing its two LSB from each colour.

Column no 1 & 4 shows the actual connectivity (as per our schematic) between processor and custom LCD (part No. AM-240320MDTNQW-00H).

I cannot change the hardware configuration.

Sl No	Processor Signal name on DM3730 torpedo SOM with colour code	24 bit Standard LCD connector with Colour code	18 bit Custom LCD connection should be as follows	Actual Connection of 18 bit LCD as per our schematic.
1	DSS_D0 => B0	B0	NC	B2
	DSS_D1=> B1	B1	NC	B3
	DSS_D2 => B2	B2	B2	B4
	DSS_D3 => B3	B3	B3	B5
	DSS_D4 => B4	B4	B4	B6
	DSS_D5 => B5	B5	B5	B7
	DSS_D6 => B6	B6	B6	NC
	DSS_D7 => B7	B7	B7	NC

	DSS_D8 => G0	G0	NC	G2
	DSS_D9 => G1	G1	NC	G3
	DSS_D10 => G2	G2	G2	G4
	DSS_D11 => G3	G3	G3	G5
	DSS_D12 => G4	G4	G4	G6
	DSS_D13 => G5	G5	G5	G7
	DSS_D14 => G6	G6	G6	NC
	DSS_D15 => G7	G7	G7	NC

	DSS_D16 => R0	R0	NC	R2
	DSS_D17 => R1	R1	NC	R3
	DSS_D18 => R2	R2	R2	R4
	DSS_D19 => R3	R3	R3	R5
	DSS_D20 => R4	R4	R4	R6
	DSS_D21 => R5	R5	R5	R7
	DSS_D22 => R6	R6	R6	NC
	DSS_D23 => R7	R7	R7	NC

Currently the colors that I am getting on LCD are distorted. Kindly help me with a software solution display the colors correctly. Let me know where exactly i need to hit at this problem in Andorid.

Thanks

bradb

Basic Member
Posts:203

21 Jul 2014 08:41 AM

Misbah,

I believe a hardware change is required for your display to perform correctly. There are only two methods of connecting an 18-bit LCD to the TI OMAP DSS. More information can be seen on TI's wiki page[1].

OMAP DSS Signal	18-bit color with pack connections in the lower data bits	18-bit color with OMAP display sub system configured for 24 bit output
DSS_D0	B0
DSS_D1	B1
DSS_D2	B2	B0
DSS_D3	B3	B1
DSS_D4	B4	B2
DSS_D5	B5	B3
DSS_D6	G0	B4
DSS_D7	G1	B5
DSS_D8	G2
DSS_D9	G3
DSS_D10	G4	G0
DSS_D11	G5	G1
DSS_D12	R0	G2
DSS_D13	R1	G3
DSS_D14	R2	G4
DSS_D15	R3	G5
DSS_D16	R4
DSS_D17	R5
DSS_D18		R0
DSS_D19		R1
DSS_D20		R2
DSS_D21		R3
DSS_D22		R4
DSS_D23		R5

[1] http://processors.wiki.ti...o_Parallel_CMOS_LCDs

Misbah khan

New Member
Posts:4

23 Jul 2014 03:34 AM	Accepted Answer
Dear bradb I understand the hardware connection as suggested but in our case the hardware change is not feasible. Hence, I am looking for a software solution ( I am using Android OS). Please help me in this direction. Regards, K. Misbah

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