MPU_Region_InitTypeDef MPU_InitStruct = {0};

    // Disables the MPU
    HAL_MPU_Disable();
    // Initializes and configures the Region and the memory to be protected
    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = MPU_REGION_NUMBER0;
    MPU_InitStruct.BaseAddress = (uint32_t) &dh_buffer;
    MPU_InitStruct.Size = MPU_REGION_SIZE_256B;
    MPU_InitStruct.SubRegionDisable = 0x0;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;

    HAL_MPU_ConfigRegion(&MPU_InitStruct);
    /* Enables the MPU */
    HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);