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MSP432 Stuck while enabling SRAM bank retention

Albert Lu1
Intellectual 520 points

Hey all,

My code worked fine until I added    

MAP_SysCtl_enableSRAMBank(SYSCTL_SRAM_BANK7); 

After halting the Watchdog.

Debugger tells me I'm stuck in while (!SYSCTL->rSRAM_BANKEN.b.bSRAM_RDY) inside of the enableSRAMBank function.

void SysCtl_enableSRAMBank(uint_fast8_t sramBank)
{
    ASSERT(SysCtlSRAMBankValid(sramBank));

    /* Waiting for SRAM Ready Bit to be set */
    while (!SYSCTL->rSRAM_BANKEN.b.bSRAM_RDY)
        ;

    SYSCTL->rSRAM_BANKEN.r = (sramBank | SYSCTL_SRAM_BANKEN_BNK0_EN);
}

Any ideas?

  • 0
    TI__Guru 56685 points
    Albert,

    What processor are you using here?

    Regards,
    JH
  • 0 in reply to Jace H
    Intellectual 520 points
    Ops. just edited the title. MSP432.
  • 0
    TI__Genius 17802 points

    Hi Albert,

    this might be related to one of the SRAM errata we currently have on the experimental silicon. MSP432 Erratasheet: http://www.ti.com/lit/pdf/slaz610

    A few things you can do to work around this:

    - Make sure to perform the SRAM bank operation before changing the VCORE.

    -  Add a time-out for the follow while loop, SRAM banks should be enabled by then, just the READY bits are not properly set.

    /* Waiting for SRAM Ready Bit to be set */
       uint32_t timeout = 1000;
        while ( (!SYSCTL->rSRAM_BANKEN.b.bSRAM_RDY) && (timeout--))
            ;
     
        SYSCTL->rSRAM_BANKEN.r = (sramBank | SYSCTL_SRAM_BANKEN_BNK0_EN);

    Both of the issues are being addressed for the production version of the device, so the original DriverLib function can be used again then.

    Hope that helps!

    ~Dung

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