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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Atmel/common2/services/delay/sam0/systick_counter.h@579:53297373a894, 2015-07-01 (annotated)

Committer:
mbed_official
Date:
Wed Jul 01 09:45:11 2015 +0100
Revision:
579:53297373a894
Child:
592:a274ee790e56
Synchronized with git revision d5b4d2ab9c47edb4dc5776e7177b0c2263459081



Full URL: https://github.com/mbedmicro/mbed/commit/d5b4d2ab9c47edb4dc5776e7177b0c2263459081/



Initial version of drivers for SAMR21

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 579:53297373a894 1 /**
mbed_official 579:53297373a894 2 * \file
mbed_official 579:53297373a894 3 *
mbed_official 579:53297373a894 4 * \brief ARM functions for busy-wait delay loops
mbed_official 579:53297373a894 5 *
mbed_official 579:53297373a894 6 * Copyright (c) 2014 Atmel Corporation. All rights reserved.
mbed_official 579:53297373a894 7 *
mbed_official 579:53297373a894 8 * \asf_license_start
mbed_official 579:53297373a894 9 *
mbed_official 579:53297373a894 10 * \page License
mbed_official 579:53297373a894 11 *
mbed_official 579:53297373a894 12 * Redistribution and use in source and binary forms, with or without
mbed_official 579:53297373a894 13 * modification, are permitted provided that the following conditions are met:
mbed_official 579:53297373a894 14 *
mbed_official 579:53297373a894 15 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 579:53297373a894 16 * this list of conditions and the following disclaimer.
mbed_official 579:53297373a894 17 *
mbed_official 579:53297373a894 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 579:53297373a894 19 * this list of conditions and the following disclaimer in the documentation
mbed_official 579:53297373a894 20 * and/or other materials provided with the distribution.
mbed_official 579:53297373a894 21 *
mbed_official 579:53297373a894 22 * 3. The name of Atmel may not be used to endorse or promote products derived
mbed_official 579:53297373a894 23 * from this software without specific prior written permission.
mbed_official 579:53297373a894 24 *
mbed_official 579:53297373a894 25 * 4. This software may only be redistributed and used in connection with an
mbed_official 579:53297373a894 26 * Atmel microcontroller product.
mbed_official 579:53297373a894 27 *
mbed_official 579:53297373a894 28 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
mbed_official 579:53297373a894 29 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 579:53297373a894 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
mbed_official 579:53297373a894 31 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
mbed_official 579:53297373a894 32 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 579:53297373a894 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
mbed_official 579:53297373a894 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
mbed_official 579:53297373a894 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
mbed_official 579:53297373a894 36 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
mbed_official 579:53297373a894 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 579:53297373a894 38 * POSSIBILITY OF SUCH DAMAGE.
mbed_official 579:53297373a894 39 *
mbed_official 579:53297373a894 40 * \asf_license_stop
mbed_official 579:53297373a894 41 *
mbed_official 579:53297373a894 42 */
mbed_official 579:53297373a894 43 /**
mbed_official 579:53297373a894 44 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
mbed_official 579:53297373a894 45 */
mbed_official 579:53297373a894 46 #ifndef CYCLE_COUNTER_H_INCLUDED
mbed_official 579:53297373a894 47 #define CYCLE_COUNTER_H_INCLUDED
mbed_official 579:53297373a894 48
mbed_official 579:53297373a894 49 #include <compiler.h>
mbed_official 579:53297373a894 50 #include <clock.h>
mbed_official 579:53297373a894 51
mbed_official 579:53297373a894 52 #ifdef __cplusplus
mbed_official 579:53297373a894 53 extern "C" {
mbed_official 579:53297373a894 54 #endif
mbed_official 579:53297373a894 55
mbed_official 579:53297373a894 56 /**
mbed_official 579:53297373a894 57 * \name Convenience functions for busy-wait delay loops
mbed_official 579:53297373a894 58 *
mbed_official 579:53297373a894 59 * @{
mbed_official 579:53297373a894 60 */
mbed_official 579:53297373a894 61
mbed_official 579:53297373a894 62 /**
mbed_official 579:53297373a894 63 * \brief Delay loop to delay n number of cycles
mbed_official 579:53297373a894 64 * Delay program execution for at least the specified number of CPU cycles.
mbed_official 579:53297373a894 65 *
mbed_official 579:53297373a894 66 * \param n Number of cycles to delay
mbed_official 579:53297373a894 67 */
mbed_official 579:53297373a894 68 static inline void delay_cycles(
mbed_official 579:53297373a894 69 const uint32_t n)
mbed_official 579:53297373a894 70 {
mbed_official 579:53297373a894 71 if (n > 0) {
mbed_official 579:53297373a894 72 SysTick->LOAD = n;
mbed_official 579:53297373a894 73 SysTick->VAL = 0;
mbed_official 579:53297373a894 74
mbed_official 579:53297373a894 75 while (!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)) {
mbed_official 579:53297373a894 76 };
mbed_official 579:53297373a894 77 }
mbed_official 579:53297373a894 78 }
mbed_official 579:53297373a894 79
mbed_official 579:53297373a894 80 void delay_cycles_us(uint32_t n);
mbed_official 579:53297373a894 81
mbed_official 579:53297373a894 82 void delay_cycles_ms(uint32_t n);
mbed_official 579:53297373a894 83
mbed_official 579:53297373a894 84 /**
mbed_official 579:53297373a894 85 * \brief Delay program execution for at least the specified number of microseconds.
mbed_official 579:53297373a894 86 *
mbed_official 579:53297373a894 87 * \param delay number of microseconds to wait
mbed_official 579:53297373a894 88 */
mbed_official 579:53297373a894 89 #define cpu_delay_us(delay) delay_cycles_us(delay)
mbed_official 579:53297373a894 90
mbed_official 579:53297373a894 91 /**
mbed_official 579:53297373a894 92 * \brief Delay program execution for at least the specified number of milliseconds.
mbed_official 579:53297373a894 93 *
mbed_official 579:53297373a894 94 * \param delay number of milliseconds to wait
mbed_official 579:53297373a894 95 */
mbed_official 579:53297373a894 96 #define cpu_delay_ms(delay) delay_cycles_ms(delay)
mbed_official 579:53297373a894 97
mbed_official 579:53297373a894 98 /**
mbed_official 579:53297373a894 99 * \brief Delay program execution for at least the specified number of seconds.
mbed_official 579:53297373a894 100 *
mbed_official 579:53297373a894 101 * \param delay number of seconds to wait
mbed_official 579:53297373a894 102 */
mbed_official 579:53297373a894 103 #define cpu_delay_s(delay) delay_cycles_ms(1000 * delay)
mbed_official 579:53297373a894 104
mbed_official 579:53297373a894 105 /**
mbed_official 579:53297373a894 106 * @}
mbed_official 579:53297373a894 107 */
mbed_official 579:53297373a894 108
mbed_official 579:53297373a894 109 #ifdef __cplusplus
mbed_official 579:53297373a894 110 }
mbed_official 579:53297373a894 111 #endif
mbed_official 579:53297373a894 112
mbed_official 579:53297373a894 113 #endif /* CYCLE_COUNTER_H_INCLUDED */