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CC2642R: Memory size of user application for developing on-chi OAD

SY Yoon
Genius 3380 points
Part Number: CC2642R
Other Parts Discussed in Thread: CC2652R7,

Hi.

I am using simplelink_cc13x2_26x2_sdk_4_30_00_54 for developing BLE application.

I want to know about the size limitation of user application for developing on-chip OAD.

  • 0
    TI__Guru* 94028 points

    Hi,

    The best way to answer this question is to look at the amount of flash used by the persistent app and all the flashed reserved by the BLE stack (to store bonding information for example). This information can be found in the .map file and will depend on the configuration of the project.

    If the memory offered by the CC2642R device is too small, then you may want to look at our CC2652R7 devices.

    Best regards,

  • 0 in reply to Clément
    Genius 3380 points

    Hi, 

    I'm beginner in TI BLE. so I'm sorry that I can't understand your recommend. 

    I compiled and make a .map file of simple_peripheral_oad_onchip_CC26X2R1_LAUNCHXL_tirtos_ccs project.

    simple_peripheral_oad_onchip_CC26X2R1_LAUNCHXL_tirtos_ccs_Debug.txt

    What should I interpret in attached .map file?

    I only know used and unused memory size.

    name                        origin          length         used       unused attr fill
    ---------------------- -------- --------- -------- -------- ---- --------
    FLASH_IMG_HDR 00000000 00000090 0000008d 00000003 R X
    ENTRY                   00000090 00000040 0000003c 00000004 R X
    FLASH                    000000d0 000560d0 0001f638 00036a98 R X
    RTOS_SRAM         20000000 0000012c 000000e4 00000048 RW X
    SRAM                     20000fdf   00013021 00003192 0000fe8f   RW X

    And I found the flash layout for BLE SDK user guide.

    file:///C:/ti/simplelink_cc13x2_26x2_sdk_4_30_00_54/docs/ble5stack/ble_user_guide/html/oad-secure/flash-layout-on-chip-stack-library.html#

    There are two applications and stack libraries in picture.

    What is the available user application space?

    I think that the space available to the user are the available user space, user application + stack library + user app interrupt vectors and user app OAD image header. Is it right?

    How should I make persistent application?

    please let me know. 

    Thanks.

  • 0 in reply to SY Yoon
    TI__Guru* 94028 points

    Hi,

    SY Yoon said:
    simple_peripheral_oad_onchip_CC26X2R1_LAUNCHXL_tirtos_ccs_Debug.txt

    Here you have provided the map file of the OAD image. The size of this image is 0x1f638 (i.e. ~128kB)

    Now, you need to look at the map file for the BIM and the persistent application:

    - The BIM is 0x4bc (i.e. ~1kB) [note: the exact value may change with the SDK versions]

             name            origin    length      used     unused   attr    fill
----------------------  --------  ---------  --------  --------  ----  --------
  FLASH_BIM             00056000   00001f54  000004bc  00001a98  R  X
  FLASH_CERT            00057f54   0000004c  00000000  0000004c  R  X
  FLASH_FNPTR           00057fa0   00000004  00000000  00000004  R  X
  FLASH_CCFG            00057fa8   00000058  00000058  00000000  R  X
  SRAM                  20000300   00013d00  00000100  00013c00  RW X

    - My persistent app is 0x19884 (i.e. ~105kB) [note: the exact value will depend on your implementation]

    So, in total, my BIM + persistent app will need 105 + 1 = 106kB of Flash.

    Knowing the device has 0x56000 (352kB) of Flash available, it means 352 - 106 = 246kB are available for the OAD app. At the beginning, we said the OAD image takes 128kB, so we will have enough space.

    Does it make more sense now?

    I hope this will help,

    Kind regards,

  • +1 in reply to Clément
    TI__Guru* 94028 points

    Hi,

    If your question is answered, please make sure to mark the thread as resolved. This will help other users to find this conversation.

    Appreciate your help,

    Kind regards,

  • 0 in reply to Clément
    Genius 3380 points

    Hi, 

    Thank you for your kind answer.