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TDA4VM: Individual camera sensor registers cannot be successfully written through i2c

Vinter
Intellectual 400 points

Part Number: TDA4VM

Hi, TI expert

We use ub933 for serializers and ub960 for deserializers,

When configuring the camera sensor register through i2c [tda4 i2c -->ub960-->ub933-->OX01F10 (camera sensor)],

There are two registers (0x0107, 0x801b) that cannot be successfully written, and the error code returned when the write fails is -1, that is, I2C_ STS_ ERR_ TIMEOUT

All other registers can be successfully written.

1) The camera supplier has provided feedback that the 0x0107 register is quite special. After writing 1 to the register, the value will immediately change to 0. When writing a register through i2c, does tda4 i2c have any verification mechanism?

2) Is there any solution or optimization method for this situation on the platform?

  • 0
    TI__Guru**** 492295 points

    Hi,

    Please find answers to your question below.

    Vinter said:
    1) The camera supplier has provided feedback that the 0x0107 register is quite special. After writing 1 to the register, the value will immediately change to 0. When writing a register through i2c, does tda4 i2c have any verification mechanism?

    Other than reading back this register, i dont see any other verification mechanism. But if the register contents changes just after writing, i dont see any other way.

    Vinter said:
    2) Is there any solution or optimization method for this situation on the platform?

    Did not get it. If all the other registers write are working fine, then what else special condition required to write to these registers? Can you please check with the camera supplier? From I2C module perspective, it will write this register in the same way as other registers.. 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Intellectual 400 points

    Hi Brijesh

    Brijesh Jadav said:
    Other than reading back this register, i dont see any other verification mechanism.

    Do you mean that the tda4 platform i2c will automatically read back for verification when writing registers?

    Brijesh Jadav said:
    Did not get it. If all the other registers write are working fine, then what else special condition required to write to these registers? Can you please check with the camera supplier? From I2C module perspective, it will write this register in the same way as other registers.. 

    I have provided feedback to the supplier, but the register 0x801b can be successfully written on other platforms.

    They suspect that the verification mechanism of "write read back" on the platform is causing the write to fail.

  • 0 in reply to Vinter
    TI__Guru**** 492295 points

    Hi Vinter,

    Vinter said:
    Do you mean that the tda4 platform i2c will automatically read back for verification when writing registers?

    No, it will not automatically readback the register. You would have to explicitly do it. 

    Vinter said:
    They suspect that the verification mechanism of "write read back" on the platform is causing the write to fail.

    Did not get it. What is write read back? I2C driver does not readback explicitly. So i really doubt it is due to this pattern. Is it possible to probe the signal on writing to this register? 

    Regards,

    Brijesh