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DS90UB941AS-Q1: Register write failed, read 0x00

Alan Xia
Genius 9780 points
Part Number: DS90UB941AS-Q1


Tool/software:

Hi team，

Tier 1：Neusoft

OEM: Geely

Our Geely project requires a read-back confirmation of the 941 initialization to ensure that the register configuration is successful; The following red box 2 registers are written 0x0a and read back values are 0x00; Read-back method is illustrated in the following figure, if you check that the read-back value of 0x00 is OK? Why is it not the configuration value 0x0a?

Is this a stable or probabilistic issue?

--Must be present

How many machines are currently present that cannot be written in?

-Tried different headunits, the same phenomenon; Is it not stable in this register write problems,

after which manual write and write cannot be written in?

-- Manual write, read, 0x00;

  • 0
    TI__Mastermind 21835 points

    Hi Alan,

    Happy to provide support on this matter. Some follow-up questions are listed below:

    Alan Xia said:
    Read-back method is illustrated in the following figure

    What the script indicates and what the comments indicate are two separate things (i.e. first line says setting 0x40 = 0x10, but comment says 0x40 = 0x11, etc.). Can you please provide an exact copy of the customer's script? The current format makes it difficult to determine what the register read/write sequence is.

    Can you also provide the history regarding these register writes? It says it was previously provided by TI but I am not personally familiar with these register writes.

    Alan Xia said:

    Is this a stable or probabilistic issue?

    --Must be present

    Not following this statement. Can you please clarify?

    Alan Xia said:

    How many machines are currently present that cannot be written in?

    -Tried different headunits, the same phenomenon; Is it not stable in this register write problems,

    Not fully following the second half of this statement - can you please clarify? How many total headunits is this occurring on? Are there any headunits that have been tested that do not show this phenomenon?

    Alan Xia said:

    after which manual write and write cannot be written in?

    -- Manual write, read, 0x00;

    Not following this statement either. Can you please clarify? Is this the only indirect register the customer cannot properly read? Have they tried reading any other registers?

    ===============

    In any case, this may already be what the customer is running, but if not, please have the customer try running the following sequence:

    board.WriteI2C(serAddr, 0x40, 0x10)

    board.WriteI2C(serAddr, 0x41, 0x86)

    board.WriteI2C(serAddr, 0x42, 0x0A)

    board.WriteI2C(serAddr, 0x40, 0x11)

    board.WriteI2C(serAddr, 0x41, 0x86)

    board.ReadI2C(serAddr, 0x42)

    Best,

    Nikolas