arm: add uart echo app

arm/hal/lib/common/xil_sleepcommon.c

@@ -0,0 +1,85 @@
+/******************************************************************************
+* Copyright (c) 2017 - 2022 Xilinx, Inc.  All rights reserved.
+* SPDX-License-Identifier: MIT
+******************************************************************************/
+
+/*****************************************************************************/
+/**
+*
+*@file xil_sleepcommon.c
+*
+* This file contains the sleep API's
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who      Date     Changes
+* ----- -------- -------- -----------------------------------------------
+* 6.6 	srm  	 11/02/17 First release
+* 7.7	sk	 01/10/22 Typecast sleep function argument from unsigned
+* 			  int to u32 to fix misra_c_2012_directive_4_6
+* 			  violation.
+* 7.7	sk	 03/02/22 Update usleep argument type to fix misra_c_2012_
+* 			  directive_4_6 violation.
+* </pre>
+******************************************************************************/
+
+
+/***************************** Include Files *********************************/
+#include "xil_io.h"
+#include "sleep.h"
+
+/****************************  Constant Definitions  *************************/
+
+
+/*****************************************************************************/
+/**
+*
+* This API gives delay in sec
+*
+* @param            seconds - delay time in seconds
+*
+* @return           none
+*
+* @note             none
+*
+*****************************************************************************/
+ void sleep(u32 seconds)
+ {
+#if defined (ARMR5)
+	sleep_R5(seconds);
+#elif defined (__aarch64__) || defined (ARMA53_32)
+	sleep_A53(seconds);
+#elif defined (__MICROBLAZE__)
+	sleep_MB(seconds);
+#else
+	sleep_A9(seconds);
+#endif
+
+ }
+
+/****************************************************************************/
+/**
+*
+* This API gives delay in usec
+*
+* @param            useconds - delay time in useconds
+*
+* @return           none
+*
+* @note             none
+*
+*****************************************************************************/
+ void usleep(ULONG useconds)
+ {
+#if defined (ARMR5)
+	usleep_R5(useconds);
+#elif defined (__aarch64__) || defined (ARMA53_32)
+	usleep_A53(useconds);
+#elif defined (__MICROBLAZE__)
+	usleep_MB(useconds);
+#else
+	usleep_A9(useconds);
+#endif
+
+ }