Add back Zynq demo - this time using SDK V14.2.

[freertos] / FreeRTOS / Demo / CORTEX_A9_Zynq_ZC702 / RTOSDemo_bsp / ps7_cortexa9_0 / libsrc / standalone_v4_1 / src / usleep.c

diff --git a/FreeRTOS/Demo/CORTEX_A9_Zynq_ZC702/RTOSDemo_bsp/ps7_cortexa9_0/libsrc/standalone_v4_1/src/usleep.c b/FreeRTOS/Demo/CORTEX_A9_Zynq_ZC702/RTOSDemo_bsp/ps7_cortexa9_0/libsrc/standalone_v4_1/src/usleep.c
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--- /dev/null
+++ b/FreeRTOS/Demo/CORTEX_A9_Zynq_ZC702/RTOSDemo_bsp/ps7_cortexa9_0/libsrc/standalone_v4_1/src/usleep.c
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+/******************************************************************************
+*
+* (c) Copyright 2009-13  Xilinx, Inc. All rights reserved.
+*
+* This file contains confidential and proprietary information of Xilinx, Inc.
+* and is protected under U.S. and international copyright and other
+* intellectual property laws.
+*
+* DISCLAIMER
+* This disclaimer is not a license and does not grant any rights to the
+* materials distributed herewith. Except as otherwise provided in a valid
+* license issued to you by Xilinx, and to the maximum extent permitted by
+* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
+* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
+* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
+* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
+* and (2) Xilinx shall not be liable (whether in contract or tort, including
+* negligence, or under any other theory of liability) for any loss or damage
+* of any kind or nature related to, arising under or in connection with these
+* materials, including for any direct, or any indirect, special, incidental,
+* or consequential loss or damage (including loss of data, profits, goodwill,
+* or any type of loss or damage suffered as a result of any action brought by
+* a third party) even if such damage or loss was reasonably foreseeable or
+* Xilinx had been advised of the possibility of the same.
+*
+* CRITICAL APPLICATIONS
+* Xilinx products are not designed or intended to be fail-safe, or for use in
+* any application requiring fail-safe performance, such as life-support or
+* safety devices or systems, Class III medical devices, nuclear facilities,
+* applications related to the deployment of airbags, or any other applications
+* that could lead to death, personal injury, or severe property or
+* environmental damage (individually and collectively, "Critical
+* Applications"). Customer assumes the sole risk and liability of any use of
+* Xilinx products in Critical Applications, subject only to applicable laws
+* and regulations governing limitations on product liability.
+*
+* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
+* AT ALL TIMES.
+*
+******************************************************************************/
+/*****************************************************************************/
+/**
+*
+* @file usleep.c
+*
+* This function provides a microsecond delay using the Global Timer register in
+* the ARM Cortex A9 MP core.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who      Date     Changes
+* ----- -------- -------- -----------------------------------------------
+* 1.00a ecm/sdm  11/11/09 First release
+* 3.07a sgd      07/05/12 Upadted micro sleep function to make use Global Timer
+* </pre>
+*
+******************************************************************************/
+/***************************** Include Files *********************************/
+
+#include "sleep.h"
+#include "xtime_l.h"
+#include "xparameters.h"
+#include "xpseudo_asm.h"
+#include "xreg_cortexa9.h"
+
+/* Global Timer is always clocked at half of the CPU frequency */
+#define COUNTS_PER_USECOND  (XPAR_CPU_CORTEXA9_CORE_CLOCK_FREQ_HZ / (2*1000000))
+
+/*****************************************************************************/
+/**
+*
+* This is not implemented .
+*
+* @param       nanoseconds
+*
+* @return      None
+*
+* @note                None.
+*
+****************************************************************************/
+void nanosleep(unsigned int nanoseconds){
+       /* not implemented */
+       (void)nanoseconds;
+}
+
+/*****************************************************************************/
+/**
+*
+* This API gives a delay in microseconds
+*
+* @param       useconds requested
+*
+* @return      0 if the delay can be achieved, -1 if the requested delay
+*              is out of range
+*
+* @note                None.
+*
+****************************************************************************/
+int usleep(unsigned int useconds)
+{
+       XTime tEnd, tCur;
+
+       XTime_GetTime(&tCur);
+       tEnd = tCur + ((XTime) useconds) * COUNTS_PER_USECOND;
+       do
+       {
+               XTime_GetTime(&tCur);
+       } while (tCur < tEnd);
+
+       return 0;
+}
+