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Custom BSL Entry Sequence MSP430F5310

Robert Parr
Prodigy 150 points

Hi,

We are looking at a project for one of our customers which requires adding a custom bsl to the application we have provided to enable in-field firmware update.

The firmware update is required to be over SPI, which from what I understand from the app notes and looking at the example code shouldn't be a problem, I will just replace the UART code with SPI instead.  However the customer does not wish to change the hardware and by default to enter the BSL some IO need toggling to make this happen but this is not possible with the hardware they have.  We would like to receive a command over the SPI to tell the msp430 that a firmware update is about to start and it then enters the BSL receives the new flash data over SPI then resets and runs the new application code.  

Most of this I am happy with I was just wondering if anyone could offer any guidance of how to enter the BSL without toggling the hardware pins...in other words is there a way that in software I can trigger a reset into BSL for firmware upgrade? And which of the files that contain the TI BSL would I find the parts to edit to get this to happen?

Many thanks in advance,

Rob

  • 0
    Guru 227245 points

    If you want to transfer the new firmware by SPI rather than UART, you'll need to write your iown BSL anyway. And then you can use any method you want to determine whether BSL mode is to be entered. The toggle sequence is nice, but you can check any other I/O pin, read the temperature (trigger with cooling spray) or whatever you can imagine.
    However, you'll still need to toggle the reset line (or doa  power cycle) in order to reset the MSP and enter the BSL check function.

  • 0
    TI__Guru 74146 points

    Hi Robert,

    It sounds like you want entering the BSL from your application to be an option (for example, your application could already be running, but if you receive a certain SPI command you want to transfer over to the SPI BSL). In this case, you may want to refer to the app note www.ti.com/lit/pdf/slaa452. This app note is about USB field firmware updates, but the concept is the same, you are just using a SPI interface instead of USB. You'd basically be doing something like section 4.3 of the app note - first you will somehow in your SPI host decide that you want to do a BSL update and then send some BSL update SPI command that you have defined. In your application code, you will have code to recognize this particular SPI command and when it occurs you will disable interrupts and jump to 0x1000 to use the software method to invoke the BSL.

    You will still need to write a new custom BSL that uses the SPI interface, but you should be able to do this by reading www.ti.com/lit/pdf/slaa450 and modifying its examples from the zip file. Mostly, you'll just need to change the peripheral interface (PI) layer of the code to use SPI. There are examples of a few different PI's in the zip file, but I don't think that SPI is one of them currently. You should be able to keep the same BSL command structure and data format so you won't have to change all of that part of the BSL code - this should simplify things.

    Hope this helps get you started!

    Regards,

    Katie

  • 0 in reply to Katie Pier
    Prodigy 150 points

    Thanks a lot Jens-Michael and Katie....that should be good to get me started at least.

    Regards,

    Rob

  • 0 in reply to Robert Parr
    Prodigy 140 points

    Hi Robert

    Dis you manage to get the BSL working on the SPI, I have searched the web and have come up with not much. I want to do firmware over the air (GSM) into external flash and then reflash the upgraded frimware into the CC430F5/6xx series. if you have some sample code that would be great

     

    Regards

    Mark

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