285 lines
9.1 KiB
C
285 lines
9.1 KiB
C
/*-
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* Copyright (C) 2001-2003 by NBMK Encryption Technologies.
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* All rights reserved.
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*
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* NBMK Encryption Technologies provides no support of any kind for
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* this software. Questions or concerns about it may be addressed to
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* the members of the relevant open-source community at
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* <tech-crypto@netbsd.org>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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static char const n8_id[] = "$Id: helper.c,v 1.2 2008/11/03 04:31:01 tls Exp $";
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/*****************************************************************************/
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/** @file helper.c *
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* @brief BSDi System Call Abstraction. *
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* *
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* This file implements the BSDi versions of some standard system calls *
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* that drivers commonly make, in a variety of platforms. It also ensures *
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* that the necessary system includes are included as well. *
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*****************************************************************************/
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/*****************************************************************************
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* Revision history:
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* 02/12/04 bac Fixed n8_usleep to work when the tick interval changes.
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* 05/05/03 brr Moved memory functions to n8_memory_bsd.c.
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* 04/23/03 brr Remove warnings from n8_delay_ms.
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* 03/12/03 jpw Added function n8_delay_ms - keep this spinlock safe!
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* 12/10/02 brr Added function n8_gettime.
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* 10/25/02 brr Clean up function prototypes & include files.
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* 06/12/02 brr Added N8_WaitEventInt function.
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* 04/02/02 spm Changed usec normalizer in n8_usleep from 1000 to 1000000.
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* this assures that units of jiffies are passed to tsleep.
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* Added case to sleep for minimum yield if usecs is less
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* than minimum yield.
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* 03/11/02 brr Update for 2.1.
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* 10/12/01 mmd Renamed Atomic*() routines to N8_Atomic*().
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* 10/04/01 mmd Original version.
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****************************************************************************/
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/** @defgroup NSP2000Driver BSDi System Call Abstraction.
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*/
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#include "helper.h"
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#include "irq.h"
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#include "n8_pub_errors.h"
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#include "n8_driver_main.h"
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#include <sys/proc.h>
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/* Since BSD does not give us a mechanism to update the write pointer */
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/* and ensure this process is asleep before the interrupt fires, this */
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/* fuction attempts to solve the problem. It goes to sleep for an */
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/* arbitrary long wait. If the ISR wakes this process up, we check */
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/* the request immediately and return on realizing the event has */
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/* completed. If the ISR fails to wake us because we are not */
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/* completely suspended, the timeout guarentees we wake up eventually */
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/* and check to see if the ISR has marked our request as complete. In */
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/* which case we return succes. Otherwise we exceed out timeout count */
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/* and return FAILURE. The count value may need adjustment based on */
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/* traffic load on the system. */
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int N8_WaitEventInt(n8_WaitQueue_t *waitQueue_p, API_Request_t *API_req_p)
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{
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int count = 0;
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do
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{
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if (API_req_p->qr.requestStatus == N8_QUEUE_REQUEST_FINISHED)
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{
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/* The event has completed, return success. */
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return 0;
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}
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tsleep(waitQueue_p, PWAIT, "QMQueue", (1*HZ));
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count++;
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}
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while (count < 5);
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return (1);
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}
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/*****************************************************************************
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* N8_BlockWithTimeout
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*****************************************************************************/
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/** @ingroup NSP2000Driver
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* @brief Block for notification or specified timeout.
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*
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* This routine abstracts the Linux system call to block until release or
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* timeout.
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*
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* @param *WaitQueue RO: Specifies the block element
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* @param timeout RO: Specifies the timeout
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* @param debug RO: Specifies whether to display debug messages
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*
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* @par Externals:
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* N/A
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*
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* @return
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* 1 = success - was woken up by corresponding call to wakeup.
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* 0 = failure - timed out.
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*
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* @par Errors:
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* See return section for error information.
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*****************************************************************************/
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unsigned char N8_BlockWithTimeout( wait_queue_head_t *WaitQueue,
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unsigned long timeout,
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unsigned char debug )
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{
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int rc;
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/* BLOCK UNTIL RELEASE, TIMEOUT, OR SIGNAL */
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rc = tsleep(WaitQueue, (PWAIT | PCATCH), "N8_BlockWithTimeout", (timeout * hz));
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if (!rc)
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{
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if (debug)
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{
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printf("NSP2000: Received desired interrupt.\n");
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}
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return 1;
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}
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if (debug && (rc == EWOULDBLOCK))
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{
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printf("NSP2000: Timed out while awaiting interrupt.\n");
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}
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else if (debug)
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{
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printf("NSP2000: An unexpected signal has interrupted N8_BlockWithTimeout.\n");
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}
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return 0;
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}
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#if 0
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/*****************************************************************************
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* n8_usleep
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*****************************************************************************/
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/** @ingroup NSP2000Driver
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* @brief Sleep usec seconds.
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*
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* The minimum delay is N8_MINIMUM_YIELD_USECS, which is usually a system
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* clock tick.
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*
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*
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* @param usecs RO: Microseconds to sleep
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*
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* @par Externals:
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* HZ is the CPU clock speed in Hertz (defined in Linux
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* kernel headers; usually 100 Hz).
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*
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* @return
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* N8_STATUS_OK Success
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*
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* @par Errors:
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* See return section.
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*
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* @par Locks:
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* None.
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*
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* @par Assumptions:
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*
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*****************************************************************************/
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N8_Status_t
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n8_usleep(unsigned int usecs)
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{
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char tmp;
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/* the minimum amount to sleep is 1 tick. if requested sleep time is less
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* than 1 tick, sleep for 1 tick. */
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if (usecs < N8_USECS_PER_TICK)
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{
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tsleep(&tmp,PZERO,"NSP2000 udelay", 1 /* tick */);
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}
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else
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{
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tsleep(&tmp,PZERO,"NSP2000 udelay",((usecs)*hz/N8_USECS_PER_SEC));
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}
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return N8_STATUS_OK;
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}
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/*****************************************************************************
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* n8_delay_ms
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*****************************************************************************/
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/** @ingroup NSP2000Driver
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* @brief Sleep for given milliseconds.
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*
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*
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* @param usecs RO: Microseconds to sleep
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*
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* @par Externals:
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* HZ is the CPU clock speed in Hertz (defined in Linux
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* kernel headers; usually 100 Hz).
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*
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* @return
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* N8_STATUS_OK Success
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*
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* @par Errors:
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* See return section.
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*
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* @par Locks:
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* None.
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*
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* @par Assumptions:
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*
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*****************************************************************************/
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N8_Status_t
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n8_delay_ms(unsigned int milliseconds)
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{
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DELAY((milliseconds*1000));
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return N8_STATUS_OK;
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}
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/*****************************************************************************
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* n8_gettime
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*****************************************************************************/
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/** @ingroup NSP2000Driver
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* @brief Get current timeval
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*
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* @param n8_timeResults_p WO: Returned time value in n8_timeval_t,
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* sec and usec
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*
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* @par Externals:
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* None.
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*
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* @return
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* N8_STATUS_OK Success
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*
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* @par Errors:
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* None.
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*
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* @par Locks:
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* None.
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*
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* @par Assumptions:
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* None.
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*
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*****************************************************************************/
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N8_Status_t
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n8_gettime( n8_timeval_t *n8_timeResults_p )
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{
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struct timespec ts;
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N8_Status_t returnResults = N8_STATUS_OK;
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getnanotime(&ts);
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/* Timespec has a seconds portion and a nano seconds portion. */
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/* Thus we need to divide to convert nanoseconds to microseconds. */
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n8_timeResults_p->tv_sec = ts.tv_sec;
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n8_timeResults_p->tv_usec = ts.tv_nsec / 1000;
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return returnResults;
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} /* n8_gettime */
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#endif
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