77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
|
/**
|
||
|
|
* \file
|
||
|
|
*
|
||
|
|
* \brief ARM functions for busy-wait delay loops
|
||
|
|
*
|
||
|
|
* Copyright (c) 2012-2015 Atmel Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
* \asf_license_start
|
||
|
|
*
|
||
|
|
* \page License
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* 3. The name of Atmel may not be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* 4. This software may only be redistributed and used in connection with an
|
||
|
|
* Atmel microcontroller product.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
|
||
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
||
|
|
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
|
||
|
|
*
|
||
|
|
* \asf_license_stop
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "cycle_counter.h"
|
||
|
|
#include "delay.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* \brief Initialize the delay driver.
|
||
|
|
*
|
||
|
|
* Not used in cycle mode.
|
||
|
|
*/
|
||
|
|
void delay_init(void)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delay loop is put to SRAM so that FWS will not affect delay time
|
||
|
|
OPTIMIZE_HIGH
|
||
|
|
RAMFUNC
|
||
|
|
void portable_delay_cycles(unsigned long n)
|
||
|
|
{
|
||
|
|
UNUSED(n);
|
||
|
|
|
||
|
|
__asm (
|
||
|
|
"loop: DMB \n"
|
||
|
|
#ifdef __ICCARM__
|
||
|
|
"SUBS r0, r0, #1 \n"
|
||
|
|
#else
|
||
|
|
"SUB r0, r0, #1 \n"
|
||
|
|
#endif
|
||
|
|
"CMP r0, #0 \n"
|
||
|
|
"BNE loop "
|
||
|
|
);
|
||
|
|
}
|