MSP430F5529: Internal info flash write failed when using USB example

Part Number: MSP430F5529

Hi,

I'm trying to read/write from/to Info D internal Flash area on the MSP430F5529.

When using the MSP430F55xx_flashwrite_02.c example, it works great but when I use the USB example (C1_LedOnOff) it seems not to work.

I'm using the C1_LedOnOff example as is with the below additional code at the beginning (for debug purpose):

void main (void)
{
    WDT_A_hold(WDT_A_BASE); // Stop watchdog timer

    unsigned long * Flash_ptrD;               // Initialize Flash pointer Seg D
    unsigned long FlashTmp;

    Flash_ptrD = (unsigned long *) 0x1800;    // Initialize Flash pointer
    FlashTmp = *Flash_ptrD;                       // Initialize Value
    FlashTmp++;
    FCTL3 = FWKEY;                            // Clear Lock bit
    FCTL1 = FWKEY+ERASE;                      // Set Erase bit
    *Flash_ptrD = 0;                          // Dummy write to erase Flash seg
    FCTL1 = FWKEY+BLKWRT;                     // Enable long-word write
    *Flash_ptrD = FlashTmp;                      // Write to Flash
    FCTL1 = FWKEY;                            // Clear WRT bit
    FCTL3 = FWKEY+LOCK;                       // Set LOCK bit
    while(1);                                 // Loop forever, SET BREAKPOINT HERE

    // Minumum Vcore setting required for the USB API is PMM_CORE_LEVEL_2 .
    PMM_setVCore(PMM_CORE_LEVEL_2);
    USBHAL_initPorts();           // Config GPIOS for low-power (output low)
    USBHAL_initClocks(8000000);   // Config clocks. MCLK=SMCLK=FLL=8MHz; ACLK=REFO=32kHz
    initTimer();           // Prepare timer for LED toggling
    USB_setup(TRUE, TRUE); // Init USB & events; if a host is present, connect

    __enable_interrupt();  // Enable interrupts globally
    
    while (1)
    {
        ...

Is there something that locks the FLASH Info area when using the USB example?

Thanks,

Itay