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MSP430F5438: Programming device from RAM without BSL

tom123456789
Prodigy 20 points
Part Number: MSP430F5438

Hi there,

I have a need to remove all of the firmware on my device and replace it with new firmware (which is a subset of the old firmware).

I have written code to load the various functions I need to RAM and perform a mass erase. This all works fine and I can verify it.

I also have the new code in RAM to be written back to flash. Writing these instructions to flash is trivial, but I am finding it tricky to work out where to put the instructions, or, where to update the pointer to the first instruction.

Basically, the code is in flash but doesn't run.

I have seem something about the address 0x17FA - this stores the address of the first instruction? Is it here that I need to put the memory address of my newly written flash? There are various signatures as well, do I need to update these in some way? I have already accidentally bricked a device!

I do not have the BSL still running on the device - I have completely deleted it if that makes a difference.

Cheers,

Tom

  • 0
    TI__Genius 14655 points

    Tom,

    According to the memory map of the MSP430F5438 device, address 0x17FA resides in the Bootloader (BSL) flash memory so it is not recommended to operate in that address range unless you are writing a custom BSL.

    TI provides software such as the MSP Bootloader and MSPBoot to help with custom memory programming projects. If you have deleted the default BSL image you can reprogram it using the MSPBoot image provided by TI.

    Best regards,

    Matt

  • 0 in reply to Matt Calvo
    Prodigy 20 points
    Hi,

    Thanks for your reply.

    I am essentially writing a BSL - how do I set which is the first instruction to be run after start up of the device?

    Thanks,

    Tom
  • 0 in reply to tom123456789
    TI__Genius 14655 points

    Tom,

    I found a document that helps customers Create a Custom Flash-Based Bootloader (BSL) which has more detailed information on how the first instructions of the BSL sequence and the actual application code are handled.

    I am going to reach out to our experts in BSL implementation to see if they have any additional recommendations or information.

    Best regards,

    Matt

  • 0 in reply to tom123456789
    TI__Intellectual 2460 points

    Hi Tom,

    What I understand from your explanation, the BSL that you created is part of your application, is that correct?

    If yes, and you would like to run this BSL application after start up of the device, you can set the reset vector (at address @0xFFEF) with the location of BSL application. However there is no direct way to overwrite the reset vector using pragma definition (i tried on my side and the compilation will fail).

    I found another thread that asked this overwriting the reset vector: http://e2e.ti.com/support/microcontrollers/msp430/f/166/t/481953

    Let me know if this helps.

  • 0 in reply to tom123456789
    TI__Genius 14655 points
    Hi Tom,

    I noticed that you selected that the latest post did not help you reach a resolution. If that is the case, could you please respond to Fatmawati's question as well as provide any other information that may help us resolve this.

    Regards,
    Matt
  • 0 in reply to Matt Calvo
    TI__Genius 14655 points
    Hi Tom,

    I haven’t heard from you for a while now, so I’m assuming you were able to resolve your issue. If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information. If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

    Regards,
    Matt

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