rtos_idle.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 
00023 #include "rtos/rtos_idle.h"
00024 #include "platform/mbed_sleep.h"
00025 
00026 static void default_idle_hook(void)
00027 {
00028     /* Sleep: ideally, we should put the chip to sleep.
00029        Unfortunately, this usually requires disconnecting the interface chip (debugger).
00030        This can be done, but it would break the local file system.
00031     */
00032     sleep();
00033 }
00034 static void (*idle_hook_fptr)(void) = &default_idle_hook;
00035 
00036 void rtos_attach_idle_hook(void (*fptr)(void))
00037 {
00038     //Attach the specified idle hook, or the default idle hook in case of a NULL pointer
00039     if (fptr != NULL) {
00040         idle_hook_fptr = fptr;
00041     } else {
00042         idle_hook_fptr = default_idle_hook;
00043     }
00044 }
00045 
00046 void rtos_idle_loop(void)
00047 {
00048     //Continuously call the idle hook function pointer
00049     while (1) {
00050         idle_hook_fptr();
00051     }
00052 }