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CC2340R5: How to calculate CRC32 for flash programming

Jerry Kuo
Expert 4320 points
Part Number: CC2340R5
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Hi team,

One programming tool vendor is developing tool for CC2340R5. They study the Uniflash. However, they cannot understand how Uniflash generate the CRC32 value. Please help provide. 

Refer to CC2340 TRM, https://www.ti.com/lit/ug/swcu193a/swcu193a.pdf chap 8. It describes as below. However, the tool vendor follow below rule to calculate. The value they calculated is different from Uniflash. 

   CRC Calculation and Location

  The CRCs use CRC-32, which has the following implementation:

  • The polynomial is x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x + 1
  • The hexadecimal representation of the polynomial is 0x04C11DB7.• The initial value is 0xFFFFFFFF.
  • 0
    TI__Guru**** 171044 points

    Hi,

    Jerry Kuo said:
    However, they cannot understand how Uniflash generate the CRC32 value.

    How are they looking at the CRC32 value of Uniflash? Are they using the value reported at the Flash Image box?

    If so, this CRC is calculated for the entire .hex file.

    The CRC32 calculation shown in the CC2340 TRM is only for the CCFG memory area of the .hex file, therefore they will be different.

    Hope this helps,

    Rafael

  • 0 in reply to desouza
    Prodigy 30 points

    Hi,Rafael:

    I am a programming tool provider,
    Hex file I can calculate the CRC32 checksum value.
    But what we receive from the client is a bin file,
    Calculating the CRC32 checksum will give different values,
    How can I get the same bin file CRC32 checksum value as UniFlash?


    Thanks for all your help

  • 0 in reply to alex lee
    TI__Genius 13095 points

    Hi Jerry, Alex,

    As noted by Rafael, the CRC32 calculation is calculated on the data in the entire file. So the value will not be the same between the .bin version of the file, and the hex version of the same program file, as the data in the file would be different.

    As for the calculation, it is based on the CRC-32/ISO-HDLC algorithm, which has the same polynomial of 0x04C11DB7 as previously noted.

    You can use the following site to check on the value that UniFlash gets by opening your binary file in a text editor, copying the ASCII/Hex data into the input box, and copying the Result value with what is calculated in UniFlash.

    Please let me know if you have any additional questions on this.
    Thanks,
    Ricky
  • 0 in reply to Ricky Lau
    Prodigy 30 points

    Hi,Ricky


    I tried using CRC-32/ISO-HDLC and other CRC32 algorithms but did not get the same CRC32 Checksum as UniFlash: 0x6E2A5B23.



    Thanks for all your help

  • 0 in reply to alex lee
    TI__Genius 13095 points

    Alex,

    Thanks for the report. I'll take a look at the implementation in UniFlash and see if there is a bug with the calculation. I will keep you updated.

    Regards,

    Ricky

  • 0 in reply to Ricky Lau
    TI__Genius 13095 points

    I found a bug in the UniFlash CRC32 calculation code. I have filed a bug to track this, and this will be fixed in the next UniFlash release (v9.2 in June).

    Thanks,

    Ricky

  • 0 in reply to Ricky Lau
    Prodigy 30 points

    Hi,Ricky

    Thanks for your help in verifying the UniFlash CRC32 calculation.

    I appreciate your help.

    Alex