I2C write problem in DLPC350.

RY9983

Other Parts Discussed in Thread: DLPC350

Hello.

I am evaluating LightCrafter4500 using I2C command from external micon.
I have not been able to write value to every registers.
Although I measured waveform by logic analyser, I can not find my problem.
Could you point out my problem?

Best regards, RY

The following diagram is case of sending "Display Mode Selection Command (I2C: 0x69)" to DLPC350 from MDU.

over 10 years ago

0 Blair Conner over 10 years ago

TI__Expert 4720 points

Hello RY,

Could you clarify your problem for me. Are you having problems writing to specific registers or any register in general?

Best regards,

Blair

0 RY9983 over 10 years ago in reply to Blair Conner

Guru 10570 points

Blair-san,
Thank you for your response.
I can not write all registers(0x0-0x7F) in DLPC350.

- When I configured from GUI, I can read its change correctly with I2C read.
- DLPC350 firmware version is v1.1.0.

Do you have any idea?
Best regards, RY

0 Blair Conner over 10 years ago in reply to RY9983

TI__Expert 4720 points

Hello RY,

Could you clarify the first byte in your image for me. You have 1AW listed. In your setup what is the W. Is it a single bit?

Please verify that your system sends the first byte for a write command as 0x35.

Best regards,

Blair

0 RY9983 over 10 years ago in reply to Blair Conner

Guru 10570 points

Blair-san,

Thank you for your comment.

Blair Conner said:

Could you clarify the first byte in your image for me. You have 1AW listed. In your setup what is the W. Is it a single bit?

Please verify that your system sends the first byte for a write command as 0x35.

First of all, write command is 0x34, isn't it ?

dlpu010b (P7)

Yes. First byte is a single bit.
I re-attach the write sequence with scale up and add I2C1_SDA value with yellow color.

'A' means 'Ack'.

Are there anything strange?

Best regards, RY

0 RY9983 over 10 years ago in reply to RY9983

Guru 10570 points

Blair-san,

Hello.
I would like to report my examination.

exam1) I configure DLPC350 by GUI, and read back register value by MCU I2C.
---> It was successful.

exam2) I configure DLPC350 by MCU I2C, and read back register value by MCU I2C.
---> I could not read expected value.

exam3) I configure DLPC350 by MCU I2C, and read back register value by GUI "Get" button.
---> I could not see expected result on GUI. (I could not see the check on GUI check box.)

Therefore, I think my I2C Read Transaction have been successful. But, I2C Write Transaction is fail.
If you have any idea, please let me know.

Best regards, RY

0 RY9983 over 10 years ago in reply to RY9983

Guru 10570 points

Blair-san,

I was successful to Write Transaction through I2C.
When I use the Display Mode Selection Command(I2C: 0x69), I have to write 0x69 | 0x80 = 0xE9.

It was posted in following link:
http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/924/p/309183/1079077.aspx

But, It must be described in Programmer's guide clearly.
Could you update PG in the future?

Best regards, RY

0 kaili kai over 10 years ago in reply to RY9983

Prodigy 20 points

is this problem occuring on all the Windows operating system?or only on windows 8?

0 RY9983 over 10 years ago in reply to kaili kai

Guru 10570 points

kaili kai-san,

Hello. This problem will occur on all the system.
Because, there is not enough description for I2C Write Transaction Sequence in PG.

Best regards, RY

0 Blair Conner over 10 years ago in reply to RY9983

TI__Expert 4720 points

Hello RY,

Thank you for posting the link. I'll note that the Programmer's Guide needs to be clarified and updated.

Best regards,

Blair

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I2C write problem in DLPC350.