/**
* Copyright (c) 2015, Trellis-Logic
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
*   list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
*   this list of conditions and the following disclaimer in the documentation
*   and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**
* The datasheet specifies this location should be on a dword boundary
*/
#define HARDWARE_WIDGET_BASE_REGISTER_LOCATION 0x1000

struct hardware_widget
{
    void *base_register_location;
};

struct hardware_widget  g_hardware_widget;

/**
 * Initializes structure with parameters for access of the hardware widget
 * @param hardware_widget The structure to initialize
 */
#if ((HARDWARE_WIDGET_BASE_REGISTER_LOCATION & 0x3) != 0 )
    #error "Hardware widget datatsheet specifies the base register should be at a DWORD boundary!"
#endif
static void init_hardware(struct hardware_widget *widget)
{
   widget->base_register_location=(void *)HARDWARE_WIDGET_BASE_REGISTER_LOCATION;
}

int main(void)
{
    init_hardware(&g_hardware_widget);
}


Add preprocessor if check example
Add preprocessor if check example
