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Linux/DS90UB913A-CXEVM: the ds90ub913 doesn't seem to work correctly when the sensor is power on

yan fang96
Prodigy 20 points
Part Number: DS90UB913A-CXEVM

Tool/software: Linux

hi alls,

          I met a  knotty problem, and I  have no idea.

          the develop environment is:   ADAS + 964 + 913 + sensor(ov5640).  using  Operation with Pixel Clock from Imager as Reference Clock, (24MHZ  to sensor  and the PCLK is 84MHZ.)

          the Adas can communication with sensor  by I2C over 964/913. but  when I  config a reg (write 0x2 to reg 0x3008 in ov5640)  to  power on the sensor.

then I can't  read and write  913 and ov5640 reg any more.  that seem  the 913 can't work correctly.  but when I reset  the sensor or disconnect these  lines (PCLK , VSYNC, VSYNC and 8 data lines) from 913.

the I2C communication return to normal and whenever config the sensor, it will not  go wrong.

        is anyone konw what cause it, thank you!

         

  • 0
    TI__Mastermind 30515 points
    Fang,
    When the I2C is halted, the UB964 can be visited via I2C? and can you share how to you configure the UB964 for I2C operation?
    also, can you check:
    1. the reg. of OV5640 has 16bits add.?
    2. what is the meaning "the I2C communication return to normal and whenever config the sensor, it will not go wrong."?

    regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 20 points
    hi Junqiang ,
    thank you for your reply.
    yes , the ADAS can visit the 964 via i2c, because the ADAS i2c bitrate is 100kbps, so I use the default I2C configuration with the 964 and 913 .
    q1, yes the reg of OV5640 is 16bits.
    q2. it means that the ADAS can visit the 913 and sensor via I2C again.

    one more thing, when I disconnect these lines (PCLK, VSYNC,data lines), the PCLK and VSYNC output from ov5640 is normal, but when
    these lines connect to 913, the PCLK signal seems not too good.
    and I read 964 status regs, their values is :
    reg 0x73 = 0x0
    reg 0x74= 0x0
    reg 0x75 = 0x0
    reg 0x76 = 0x0
    reg 0x4d = 0x3
    reg 0x4e= 0x4
    reg 0x4f = 0x30
    reg 0x50= 0x0
    reg 0x55 = 0x0
    [ reg 0x56= 0x0
  • 0 in reply to yan fang96
    TI__Mastermind 30515 points
    Fang,
    can you share the PCLK plots when you connect and dis-connect it to UB913? also, which SOC is used to connect with UB964.

    best regards,
    Steven