The Configure_Protection_Masks provides functionality to disable Write/Erase protection for any sector selected for EEPROM Emulation. This is done by calculating the appropriate Masks to pass to the Fapi_setupBankSectorEnable function. It requires two parameters, a pointer to the selected Flash Sector numbers, and the number of Flash Sectors to be emulated. For more information on the implementation of the Fapi_setupBankSectorEnable function, see the F29H85x Flash API Reference Guide.

The return value of this function is used to disable Write/Erase protection in Flash Sectors selected for EEPROM Emulation.

uint64 Protection_Mask_Sectors = 0;

if (Num_EEPROM_Sectors > 1)
{
    uint64_t Unshifted_Sectors;
    uint8_t Shift_Amount;

    // All sectors use Mask A
    if (Sector_Numbers[0] < 32 && Sector_Numbers[1] < 32)
    {
        // Push 1 out to 1 past the number of sectors
        Unshifted_Sectors = (uint64_t) 1 << Num_EEPROM_Sectors;
        // Subtract 1 --> now we have all 1s for the sectors we want
        Unshifted_Sectors -= 1;
        // Shift over by start location and OR with master
        Protection_Mask_Sectors |= (Unshifted_Sectors << Sector_Numbers[0]);
    }
    // All sectors use Mask B
    else if (Sector_Numbers[0] > 31 && Sector_Numbers[1] > 31)
    {
        Shift_Amount = ((Sector_Numbers[1] - 32) / 8) - ((Sector_Numbers[0] - 32) / 8) + 1;
        Unshifted_Sectors = (uint64) 1 << Shift_Amount;
        Unshifted_Sectors -= 1;
        Protection_Mask_Sectors |= (Unshifted_Sectors << ((Sector_Numbers[0] - 32)/8));
        Protection_Mask_Sectors = Protection_Mask_Sectors << 32;
    }
    // Mix of Masks A and B
    else
    {
        // Configure Mask B
        Shift_Amount = ((Sector_Numbers[1] - 32)/8) + 1;
        Unshifted_Sectors = (uint64) 1 << Shift_Amount;
        Unshifted_Sectors -= 1;
        Protection_Mask_Sectors |= Unshifted_Sectors;

        // Zero out the bottom half so we can configure Mask A
        Protection_Mask_Sectors = Protection_Mask_Sectors << 32;

        // Configure Mask A
        Unshifted_Sectors = (uint64) 1 << ((32 - Sector_Numbers[0]) + 1);
        Unshifted_Sectors -= 1;
        Protection_Mask_Sectors |= (Unshifted_Sectors << Sector_Numbers[0]);
    }
}
// Only using 1 sector
else
{
    // Mask A
    if(Sector_Numbers[0] < 32)
    {
        Protection_Mask_Sectors |= ((uint64) 1 << Sector_Numbers[0]);
    }
    // Mask B
    else
    {
        Protection_Mask_Sectors |= ((uint64) 1 << ((Sector_Numbers[0] - 32)/8));
        Protection_Mask_Sectors = Protection_Mask_Sectors << 32;
    }
}

return Protection_Mask_Sectors;