/*
 *  Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ 
 *  
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions 
 *  are met:
 *
 *    Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer.
 *
 *    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.
 *
 *    Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 *  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
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 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *  
 */
//*****************************************************************************
//
//  utils.c
//
//  Utility APIs
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup Utils_api
//! @{
//
//*****************************************************************************
#include "utils.h"


//*****************************************************************************
//
//! Provides a small delay.
//!
//! \param ulCount is the number of delay loop iterations to perform.
//!
//! This function provides a means of generating a constant length delay.  It
//! is written in assembly to keep the delay consistent across tool chains,
//! avoiding the need to tune the delay based on the tool chain in use.
//!
//! The loop takes 3 cycles/loop.
//!
//! \return None.
//
//*****************************************************************************
#if defined(ewarm) || defined(DOXYGEN)
void
UtilsDelay(unsigned long ulCount)
{
    __asm("    subs    r0, #1\n"
          "    bne.n   UtilsDelay\n");
}
#endif

#if defined(gcc)
void __attribute__((naked))
UtilsDelay(unsigned long ulCount)
{
    __asm("    subs    r0, #1\n"
          "    bne     UtilsDelay\n"
          "    bx      lr");
}
#endif

//
// For CCS implement this function in pure assembly.  This prevents the TI
// compiler from doing funny things with the optimizer.
//
#if defined(ccs)
    __asm("    .sect \".text:UtilsDelay\"\n"
          "    .clink\n"
          "    .thumbfunc UtilsDelay\n"
          "    .thumb\n"
          "    .global UtilsDelay\n"
          "UtilsDelay:\n"
          "    subs r0, #1\n"
          "    bne.n UtilsDelay\n"
          "    bx lr\n");
#endif

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************
