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ADS131M02: ADS131M02　I could not write a register

hiroshi maeda
Prodigy 30 points
Part Number: ADS131M02

Tool/software:

 

Hello

I have a question. I want to use ADS131M02, I could make read register program, but I could not make write program. The figure below shows , address 4 register  I wrote 0x0077,but I read an address 4,not become 0x0077. become 0,not change.

I did download sample program, I could not find a correct way.

for example, while(SSIDdataGetBlocking(SSI_BASE_ADDR,&junk); I don't know what this function does. I understand the need for it, but it doesn't seem to be described in the manual.

Why I could not  write?  if you find a reason, could you explain for me a little voice. 

Sincerely,

hiroshi  

  • 0
    TI__Mastermind 38205 points

    Hi hiroshi,

    Is your data word length default 24-bit or 16-bit you have changed? I believe your word size is 24-bit if you look at your 2nd timing and ignore the unexpected narrow pulse on /CS. If your word size is the default 24-bit, you are writing 0x7700 to the GAIN1 register which is not a valid register data for the GAIN1 register. Also, your may have to check your code to see why an unexpected pulse on /CS was sent out by your microcontroller.

    BR,

    Dale

  • 0 in reply to Dale Li
    Prodigy 30 points

    Hi Dale Li

    Thank you for  your teaching.

    word length is default 24bit.I am going wrote 0x0077,not 0x7700,I need write 0x000077? 24bit length?

    Sincerely,

    hiroshi  

  • 0 in reply to Dale Li
    Prodigy 30 points

    Hi Dale Li

    Thank you for  your teaching.

    I wrote address1 register  24bit -> 16bit length chage,

    I wrote address4 register  0x0077,then I could get 0x0077 register data!

    Thank you for your advice!

    Sincerely,

    hiroshi