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CC3220: simple bootloader example

Shamil Farsiev
Expert 1515 points
Part Number: CC3220
Other Parts Discussed in Thread: , ENERGIA, CC3200, UNIFLASH

guys, can you show me sources of very simple bootlodr which can work with serial flash memory and program memory. and which i can load by uart.

  • 0
    Guru 80205 points
    Hi,

    Why not use embedded programming ( www.ti.com/.../EMBEDDED-PROGRAMMING ) for this purpose?

    Jan
  • 0 in reply to Jan D
    Expert 1515 points
    we have to have own custom bootloader and bootloader protocol.
  • 0 in reply to Shamil Farsiev
    Guru 80205 points

    Hi,

    It is important to know if you want to use CC3220S(R) or CC3220SF device. How CC3220SF chip is designed, it is slightly complicated to create own bootloader. Because content of XIP flash (on-chip) flash is synchronised with firmware file inside sFlash by the ROM bootloader. Two possible ways:

    - execute your code only from RAM not from XIP flash (S and SF)

    S(R): ROM bootloader -> copy user bootloader into RAM -> run user bootloader from RAM -> copy firmware into RAM -> execute code from RAM

    SF: ROM bootloader -> synchronise XIP (user booloader file) -> run user bootloader from XIP -> copy firmware file to RAM -> execute code from RAM

    - execute code from top bank of XIP flash (SF only)

    SF: ROM bootloader -> synchronise XIP (user booloader file) -> run user bootloader -> execute firmware from 2nd bank of XIP (in this stage can be also synchonised 2nd bank of XIP with your firmware file)

    None of this way is officially supported by TI. Implementation will be up to you. I have personally done small bootlaoder for Energia ( ). Main idea of this bootlaoder comes from bootloader from previous generation SDK (CC3200).

    Jan

  • 0 in reply to Jan D
    Expert 1515 points

    i program for CC3220SF

    >> link

    I'll take a look for a couple hours

    install it by uart? ot another ways?

  • 0 in reply to Shamil Farsiev
    Guru 80205 points
    Hi,

    Sorry, I don't understand your question.

    In case you want execute code from XIP flash, only reasonable option is to use load your code into 2nd bank of flash. It is achievable, but there is many hidden traps. You should to consider to use Embedded programming.

    Jan
  • 0 in reply to Jan D
    Expert 1515 points
    can you show me a sources?
  • 0 in reply to Shamil Farsiev
    Guru 80205 points
    Hi,

    You can download source code of "simple bootloader" for executing Energia code at SF here: e2e.ti.com/.../2662274

    Jan
  • 0 in reply to Jan D
    Expert 1515 points
    thanks!
    i think i understand how your bootloader work. it put bin file from uart to flash, copy file to RAM and run it.
    it seem i can copy raw(CCS compiled file) bin file to uart and run it.
  • 0 in reply to Shamil Farsiev
    Guru 80205 points

    Hi,

    ... but you file need to be compiled to be able execute from RAM not from XIP flash. For this purpose you need properly set linker file. For example you can take linker file from CC3220S devices from SDK.

    In case of that your code is not big (all fit into 256kB RAM), this way is possible.

    Jan

  • 0 in reply to Jan D
    Expert 1515 points

    and my custom OTA update will look like:
    1) first start chip at new PCB - load my Custom BootLoader (CBL) (signed by Uniflash) by uart production line programmer and start it;
    2) by CBL(uart part) load raw bin with my main program and save it as file main1.bin to external sFlash
    3) if UART is disconnected - start bootloader, copy main1.bin to ram and run program
    4) if my server has a main2.bin - my program download it from server to sFlash as main2.bin
    5) if bootloader see new file - run it and delete old main1.bin and rename main2.bin to main1.bin

    looks nice, but my chip is works for 1-3 secs and go to hib for 180 secs.
    this "petrushka" (russisan situation character) is not for our case of work.
    is any way to save bin file to XIP flash and run it after custom OTA update?

    upd: a forgot about it
    >>> execute code from top bank of XIP flash
    how to do it?

    p.s. where did you found out asm code list?
    p.p.s. idiot question, but where in CCS i can see size of bin file and RAM usage?

  • 0 in reply to Shamil Farsiev
    Guru 80205 points

    Hi,

    As I said you can store your code into 2nd bank of XIP flash and from bootlaoder jump to this code for execution. Detailed information about XIP flash you find at TRM ( www.ti.com/.../swru465 ) chapter 21. For writing into XIP flash you can use \source\ti\devices\cc32xx\driverlib\flash.h

    - ASM code comes from secondary bootlaoder from previous generation (CC3200) SDK. But it is not a rocket science. This code you can also use to executing from XIP flash.
    - memory areas are configured in linker file (*.cmd file) inside your CCS project

    - for determining sizes of memory section you can use Memory Allocation tool in CCS


    Jan

  • 0 in reply to Jan D
    Expert 1515 points

    i see. chapter 21.6.
    trying...

    - where can i find out asm code list document for cc322sf?
    - no!) i need where can i see how many bytes will be at flash and RAM usage (as atmel studio after build console show : "20188bytes of flash usage, 48% ram allocated")

  • 0 in reply to Shamil Farsiev
    Guru 80205 points
    Hi,

    - CC3220 use Cortex-M4 core, for instruction list you can see ARM reference manual ( infocenter.arm.com/.../CIHJJEIH.html )
    - for determining sizes of memory sections you can use Memory Allocation tool in CCS (as I wrote at previous answer)

    Jan
  • 0 in reply to Jan D
    Expert 1515 points
    -thanks!
    - thanks! (long hard week)