MSP430F5328: How to customize MSPboot for MSP430F5328 and BSL MSPBoot Main App jumping

Hi Kathy,

kathy huang said:

I found BSL has 2KB size limitation,

I haven't found any documentation related to a 2KB limitation. Can you clarify what you mean?

Regards,

Evan

Hi Evan,

Thanks for you reply. I found it on "Creating a Custom Flash-Based Bootloader (BSL) (Rev. G)" document which TI released on page 3 segment 1.1 BSL Memory Layout. As below.it said This BSL memory is a 2KB section of flash. Thank you.

Hi Evan,

Thanks for your reply, I get what you mean. But based on MSP430 Flash programmer tools memory configuration options as below, we can see the BSL size has limitation, am I right?

Another, I have few other questions as below.

first I want to ask what is the relation ship between BSL and MSPBoot. Is MSPBoot just used by the MCU which do not have BSL? Can I say MSPBoot is also an application?

Another, I have a question about BSL,MSPboot and main APP jumping.

May I know if  I can do directly jump from main APP to MSPBoot by using (void(*)())address_of_mspboot)()? 

If I want to jump from MSPBoot back to main APP, should I jump to BSL first then jump to main App from BSL ?  or I can directly jump to main App by using  (void(*)())address_of_mainApp)() from MSPBoot? Thank you very much.

kathy huang said:

BSL size has limitation, am I right?

Yes, but it's still unclear to me why this is a limitation for you. This is just the size of the BSL code region on the device.

kathy huang said:

what is the relation ship between BSL and MSPBoot. Is MSPBoot just used by the MCU which do not have BSL?

The introduction to the MSPBoot document has a good description:

kathy huang said:

May I know if  I can do directly jump from main APP to MSPBoot by using (void(*)())address_of_mspboot)()? 

I think you may need to do a little bit more than that. Here is a snippet from an example using MSPBoot (you can find it in the main MSPBoot download). 

int main_boot( void )
{
    // Stop watchdog timer to prevent time out reset
    WDTCTL = WDTPW + WDTHOLD;

   /* 
    * Important Note: 
    *   MSPBoot assumes that proper conditions are met when executing after reset. 
    *   It’s important to remark that DCO must not be changed until VCC>=VCC(min), 
    *   and a minimum of 2.2V is required for Flash Program/Erase operations.
    *   An optional software delay can be added for applications having a slow 
    *   voltage ramp-up or an external voltage supervisor is suggested
    *   
    */
    //  __delay_cycles(10000);  // Uncomment this line and adjust number of delay 
                                // cycles according to the application voltage ramp
    // Initialize MCU
    HW_init();

    Clock_init();

    // Validate the application and jump if needed
    if (TI_MSPBoot_AppMgr_ValidateApp() == true)
        TI_MSPBoot_APPMGR_JUMPTOAPP();

    TI_MSPBoot_CI_Init();      // Initialize the Communication Interface

#ifndef NDEBUG
    P1DIR |= BIT0;     // Used for debugging purposes to show entry to MSPBoot
    P4DIR |= BIT7;
    P1OUT |= BIT0;
    P4OUT |= BIT7;
#endif

    while(1)
    {
        // Poll PHY and Data Link interface for new packets
        TI_MSPBoot_CI_PHYDL_Poll();

        // If a new packet is detected, process it
        if (TI_MSPBoot_CI_Process() == RET_JUMP_TO_APP)
        {
            // If Packet indicates a jump to App
            TI_MSPBoot_AppMgr_JumpToApp();
        }
#ifdef NDEBUG
        // Feed the dog every (interval depends on MCLK freq)
        WATCHDOG_FEED();
#endif
    }

Hi Evan,

Thanks for your reply.

I want to implement firmware upgrade in BSL, and planed to backup my main Application image to external SPI flash,So I need add new PI of SPI in BSL, But that will increase BSL's size to 3KB. that's no allowed.   

Now I am trying to customize MSPBoot and want to implement my firmware upgrade logic in the MSPBoot.  But seems I need to know the Boot sequence for the MSP430F5328 device. If I have MSPBoot and main App in my internal flash. Once the devices booted up, it will jump to MSPBoot first or main App? another, if I want to jump from main App to MSPBoot, should I just set a BOR in register and let the device reboot? Once the device rebooted how do I know it will jump to MSPBoot or not?

So where can define the boot up sequence? should I need BSL to  be as a bootstrap for the device's every boot up? Thank you very much.

Hi Kathy,

The examples in the MSPBoot download show the device first performing the boot checks (i.e. should the MSPBoot take control of the device?) and then otherwise calling the application(). 

I think it is always easiest trying to adapt an example to your application. 

Evan

Hi Evan,

Thanks for your reply.

May I know if the device do not have BSL then how can I make the MSPBoot executed first? Thank you.

Kathy,

Almost all MSP devices have some sort of BSL, including the F5328. BSL is only invoke if certain conditions exist, generally:

1. RST/TEST are toggled in a specific sequence (this can happen at any point during the lifetime of the application)
2. BSL is manually invoked by application software. 

If neither of these things happen then BSL will not be invoked and the CPU will begin executing the application code.

Regards,

Evan