[136] | 1 | /*
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| 2 | Copyright (c) 2012 Arduino. All right reserved.
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| 3 |
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| 4 | This library is free software; you can redistribute it and/or
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| 5 | modify it under the terms of the GNU Lesser General Public
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| 6 | License as published by the Free Software Foundation; either
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| 7 | version 2.1 of the License, or (at your option) any later version.
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| 8 |
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| 9 | This library is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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| 12 | See the GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public
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| 15 | License along with this library; if not, write to the Free Software
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| 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 17 | */
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| 18 |
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| 19 | /**
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| 20 | * Empty yield() hook.
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| 21 | *
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| 22 | * This function is intended to be used by library writers to build
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| 23 | * libraries or sketches that supports cooperative threads.
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| 24 | *
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| 25 | * Its defined as a weak symbol and it can be redefined to implement a
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| 26 | * real cooperative scheduler.
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| 27 | */
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| 28 | static void __empty() {
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| 29 | // Empty
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| 30 | }
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| 31 | void yield(void) __attribute__ ((weak, alias("__empty")));
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| 32 |
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| 33 | /**
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| 34 | * SysTick hook
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| 35 | *
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| 36 | * This function is called from SysTick handler, before the default
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| 37 | * handler provided by Arduino.
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| 38 | */
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| 39 | static int __false() {
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| 40 | // Return false
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| 41 | return 0;
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| 42 | }
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| 43 | int sysTickHook(void) __attribute__ ((weak, alias("__false")));
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| 44 |
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| 45 | /**
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| 46 | * SVC hook
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| 47 | * PendSV hook
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| 48 | *
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| 49 | * These functions are called from SVC handler, and PensSV handler.
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| 50 | * Default action is halting.
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| 51 | */
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| 52 | static void __halt() {
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| 53 | // Halts
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| 54 | while (1)
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| 55 | ;
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| 56 | }
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| 57 | void svcHook(void) __attribute__ ((weak, alias("__halt")));
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| 58 | void pendSVHook(void) __attribute__ ((weak, alias("__halt")));
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