DS90UH949A-Q1: Example script about writing EDID to Internal SRAM from ALP that uses I2C

Roy Chou1

Part Number: DS90UH949A-Q1
Other Parts Discussed in Thread: ALP

Hi Team,

We are trying to bring up panel by using 949+948. I find below link in E2E.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/761584/ds90uh949-q1-how-to-refresh-edid/2815112?tisearch=e2e-sitesearch&keymatch=edid_load.py#2815112

As title, I would like to know if we have example script about writing EDID to Internal SRAM from ALP that uses I2C.

I can just write below EDID information in it. Is it correct?

Regards,

Roy

over 3 years ago

0 Shu Huang over 3 years ago

TI__Mastermind 18046 points

Hi Roy,

Here are the steps you would go about writing EDID to the internal SRAM via ALP.

1. Set register 0x48 to 0xD which will enable APB interface, direct the message to EDID SRAM, and enable auto address increment.

2. Set register 0x49 to 0x00 for 8-bit register address.

3. Start writing EDID data to register 0x4B one byte at a time.

There are 3rd party EDID editors (such as Deltacast) that can help you translate the timing into a binary/hex format to write into ALP.

Best,

Shu

0 Shu Huang over 3 years ago in reply to Shu Huang

TI__Mastermind 18046 points

The below example script has a function to write to the EDID and you just have populate the exEDID field with the EDID data.

Best,

Shu

Fullscreen 5545.Example EDID Load.py Download

# Script to load EDID using built-in ALP routines

exEDID = [0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
		0x10,0xAC,0x4D,0x40,0x4D,0x4E,0x35,0x30,
		0x29,0x14,0x01,0x04,0xA3,0x2F,0x1E,0x78,
		0x3E,0xEE,0x95,0xA3,0x54,0x4C,0x99,0x26,
		0x0F,0x50,0x54,0xA5,0x4B,0x00,0x71,0x4F,
		0x81,0x80,0xB3,0x00,0x01,0x01,0x01,0x01,
		0x01,0x01,0x01,0x01,0x01,0x01,0x7C,0x2E,
		0x90,0xA0,0x60,0x1A,0x1E,0x40,0x30,0x20,
		0x36,0x00,0xDA,0x28,0x11,0x00,0x00,0x1A,
		0x00,0x00,0x00,0xFF,0x00,0x55,0x38,0x32,
		0x39,0x4B,0x30,0x41,0x36,0x30,0x35,0x4E,
		0x4D,0x0A,0x00,0x00,0x00,0xFC,0x00,0x44,
		0x45,0x4C,0x4C,0x20,0x50,0x32,0x32,0x31,
		0x30,0x0A,0x20,0x20,0x00,0x00,0x00,0xFD,
		0x00,0x38,0x4B,0x1E,0x53,0x10,0x00,0x0A,
		0x20,0x20,0x20,0x20,0x20,0x20,0x00,0x70,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
		0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]


# Write to EDID (start offset, data, length)
board.EDID_Write(0x0, exEDID, 256)

# Readback EDID
read_edid = board.EDID_Read(0x0, 256)
print "EDID readback:"
print read_edid

0 Roy Chou1 over 3 years ago in reply to Shu Huang

TI__Genius 16445 points

Hi Shu,

Can you help modify the EDID file for us? The resolution is showing as top side. Thank you.

Regards,

Roy

0 Roy Chou1 over 3 years ago in reply to Roy Chou1

TI__Genius 16445 points

Hi Shu,

Update the timing table. The related Horizontal value should *2 because we use dual oLDI and so EDID resolution should be 1920*720(Hactive * Vactive)

Regard,.

Roy

0 Shu Huang over 3 years ago in reply to Roy Chou1

TI__Mastermind 18046 points

Hi Roy,

I can help modify the EDID file, please allow me 1-2 business days to complete that request.

Best,

Shu

0 Shu Huang over 3 years ago in reply to Shu Huang

TI__Mastermind 18046 points

Hi Roy,

Please see the attached EDID file.

Best,

Shu

Fullscreen EDID_1920x720.py Download

# Script to load EDID using built-in ALP routines

exEDID = [0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
        0x04,0x21,0x00,0x00,0x00,0x00,0x00,0x00,
        0x01,0x00,0x01,0x04,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x0D,0x25,
        0x80,0xA0,0x70,0xD0,0x28,0x20,0x00,0x00,
        0x00,0x00,0x20,0xF8,0x82,0x00,0x00,0x00,
        0x8E,0x12,0xC0,0x50,0x30,0xD0,0x28,0x20,
        0x00,0x00,0x00,0x00,0x10,0xF8,0x42,0x00,
        0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0D]


# Write to EDID (start offset, data, length)
board.EDID_Write(0x0, exEDID, 256)

# Readback EDID
read_edid = board.EDID_Read(0x0, 256)
print "EDID readback:"
print read_edid

0 Roy Chou1 over 3 years ago in reply to Shu Huang

TI__Genius 16445 points

Hi Shu,

I meet some problems using the EDID file that you provided.

Also, I tried using our 1080p EDID example and the system can work in that EDID. And so I think the root cause if from EDID file.

Fullscreen TXN_1080p_2ch.py Download

# Script to load EDID using built-in ALP routines

# Load EDID with 1080p 2-channel EDID
TXN_1080p_2ch = [0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x53,0x0E,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x03,
        0xA3,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,
        0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
        0x01,0x01,0x01,0x01,0x02,0x3A,0x80,0x18,0x71,0x38,
        0x2D,0x40,0x58,0x58,0x45,0x00,0x80,0x38,0x74,0x00,
        0x00,0x18,0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x9A,0x02,0x03,
        0x11,0x40,0x41,0x90,0x23,0x09,0x04,0x04,0x66,0x03,
        0x0C,0x00,0x00,0x00,0x80,0x02,0x3A,0x80,0x18,0x71,
        0x38,0x2D,0x40,0x58,0x58,0x45,0x00,0x80,0x38,0x74,
        0x00,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0xFF,0x8E]

# Write to EDID (start offset, data, length)
board.EDID_Write(0x0, TXN_1080p_2ch, 256)

# Readback EDID
read_edid = board.EDID_Read(0x0, 256)
print "EDID readback:"
print read_edid

Regards,

Roy

0 Roy Chou1 over 3 years ago in reply to Roy Chou1

TI__Genius 16445 points

Hi Su,

Below is our desired timing.

Horizontal Active: 1920
Horizontal Blanking: 80
Vertical Active: 720
Vertical Blanking: 40
Horizontal Sync Offset: 79
Horizontal Sync Pulse: 1
Vertical Sync Offset: 39
Vertical Sync Pulse: 1

Regards,

Roy

0 Shu Huang over 3 years ago in reply to Roy Chou1

TI__Mastermind 18046 points

Hi Roy,

This is the 3rd party EDID generator that I am using. Can you provide the highlighted parameters? The timing you provided doesn't have enough information for me to populate all the necessary parameters and will cause an incorrect EDID.

Also note that the H. Blank = H. Front Porch + H. Sync Width + H. Back Porch (same applies for Vertical)

Best,

Shu

0 Roy Chou1 over 3 years ago in reply to Shu Huang

TI__Genius 16445 points

Hi Shu,

Please see below. Thank you.

I download the program, but I'm not sure how to generate the corresponding EDID array. Thank you.

Roy

0 Shu Huang over 3 years ago in reply to Roy Chou1

TI__Mastermind 18046 points

Hi Roy,

Please see the attached screenshot, I highlighted all the buttons you need to generate the EDID.

The script with the new EDID information is also attached.

Best,

Shu

Fullscreen 0312.EDID_1920x720.py Download

# Script to load EDID using built-in ALP routines

exEDID = [0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
        0x04,0x21,0x00,0x00,0x00,0x00,0x00,0x00,
        0x01,0x00,0x01,0x04,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x0A,0x23,
        0x80,0x50,0x70,0xD0,0x28,0x20,0x4F,0x01,
        0x71,0x08,0xD0,0xF8,0x72,0x00,0x00,0x00,
        0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x95]


# Write to EDID (start offset, data, length)
board.EDID_Write(0x0, exEDID, 256)

# Readback EDID
read_edid = board.EDID_Read(0x0, 256)
print "EDID readback:"
print read_edid

0 Roy Chou1 over 3 years ago in reply to Shu Huang

TI__Genius 16445 points

Hi Shu,

Thank you for your help.

I ran the script in 949 with ALP demo mode. It looks the issue same as before. Can you help check the EDID format? Thank you.

Regards,

Roy

0 Shu Huang over 3 years ago in reply to Roy Chou1

TI__Mastermind 18046 points

Hi Roy,

Try this one. Sorry I just noticed that the tool I use generate 128 byte EDIDs rather than our sample scripts 256. I modified the length of the EDID write and read functions at the bottom.

Best,

Shu

Fullscreen 0763.EDID_1920x720.py Download

# Script to load EDID using built-in ALP routines

exEDID = [0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
        0x04,0x21,0x00,0x00,0x00,0x00,0x00,0x00,
        0x01,0x00,0x01,0x04,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,
        0x01,0x00,0x01,0x00,0x01,0x00,0x0A,0x23,
        0x80,0x50,0x70,0xD0,0x28,0x20,0x4F,0x01,
        0x71,0x08,0xD0,0xF8,0x72,0x00,0x00,0x00,
        0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x95]


# Write to EDID (start offset, data, length)
board.EDID_Write(0x0, exEDID, 128)

# Readback EDID
read_edid = board.EDID_Read(0x0, 128)
print "EDID readback:"
print read_edid

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DS90UH949A-Q1: Example script about writing EDID to Internal SRAM from ALP that uses I2C