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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