Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
sys.h
00001 /* 00002 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without modification, 00006 * are permitted provided that the following conditions are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright notice, 00011 * this list of conditions and the following disclaimer in the documentation 00012 * and/or other materials provided with the distribution. 00013 * 3. The name of the author may not be used to endorse or promote products 00014 * derived from this software without specific prior written permission. 00015 * 00016 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00017 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00018 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00019 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00020 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00021 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00022 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00023 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00024 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00025 * OF SUCH DAMAGE. 00026 * 00027 * This file is part of the lwIP TCP/IP stack. 00028 * 00029 * Author: Adam Dunkels <adam@sics.se> 00030 * 00031 */ 00032 #ifndef __LWIP_SYS_H__ 00033 #define __LWIP_SYS_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #ifdef __cplusplus 00038 extern "C" { 00039 #endif 00040 00041 #if NO_SYS 00042 00043 /* For a totally minimal and standalone system, we provide null 00044 definitions of the sys_ functions. */ 00045 typedef u8_t sys_sem_t; 00046 typedef u8_t sys_mbox_t; 00047 struct sys_timeo {u8_t dummy;}; 00048 00049 #define sys_init() 00050 #define sys_timeout(m,h,a) 00051 #define sys_untimeout(m,a) 00052 #define sys_sem_new(c) c 00053 #define sys_sem_signal(s) 00054 #define sys_sem_wait(s) 00055 #define sys_sem_wait_timeout(s,t) 00056 #define sys_arch_sem_wait(s,t) 00057 #define sys_sem_free(s) 00058 #define sys_mbox_new(s) 0 00059 #define sys_mbox_fetch(m,d) 00060 #define sys_mbox_tryfetch(m,d) 00061 #define sys_mbox_post(m,d) 00062 #define sys_mbox_trypost(m,d) 00063 #define sys_mbox_free(m) 00064 00065 #define sys_thread_new(n,t,a,s,p) 00066 00067 #else /* NO_SYS */ 00068 00069 /** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */ 00070 #define SYS_ARCH_TIMEOUT 0xffffffffUL 00071 00072 /* sys_mbox_tryfetch returns SYS_MBOX_EMPTY if appropriate. 00073 * For now we use the same magic value, but we allow this to change in future. 00074 */ 00075 #define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT 00076 00077 #include "lwip/err.h" 00078 #include "arch/sys_arch.h" 00079 00080 typedef void (* sys_timeout_handler)(void *arg); 00081 00082 struct sys_timeo { 00083 struct sys_timeo *next; 00084 u32_t time; 00085 sys_timeout_handler h; 00086 void *arg; 00087 }; 00088 00089 struct sys_timeouts { 00090 struct sys_timeo *next; 00091 }; 00092 00093 /* sys_init() must be called before anthing else. */ 00094 void sys_init(void); 00095 00096 /* 00097 * sys_timeout(): 00098 * 00099 * Schedule a timeout a specified amount of milliseconds in the 00100 * future. When the timeout occurs, the specified timeout handler will 00101 * be called. The handler will be passed the "arg" argument when 00102 * called. 00103 * 00104 */ 00105 void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg); 00106 void sys_untimeout(sys_timeout_handler h, void *arg); 00107 struct sys_timeouts *sys_arch_timeouts(void); 00108 00109 /* Semaphore functions. */ 00110 sys_sem_t sys_sem_new(u8_t count); 00111 void sys_sem_signal(sys_sem_t sem); 00112 u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout); 00113 void sys_sem_free(sys_sem_t sem); 00114 void sys_sem_wait(sys_sem_t sem); 00115 int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout); 00116 00117 /* Time functions. */ 00118 #ifndef sys_msleep 00119 void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */ 00120 #endif 00121 #ifndef sys_jiffies 00122 u32_t sys_jiffies(void); /* since power up. */ 00123 #endif 00124 00125 /* Mailbox functions. */ 00126 sys_mbox_t sys_mbox_new(int size); 00127 void sys_mbox_post(sys_mbox_t mbox, void *msg); 00128 err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg); 00129 u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout); 00130 #ifndef sys_arch_mbox_tryfetch /* Allow port to override with a macro */ 00131 u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg); 00132 #endif 00133 /* For now, we map straight to sys_arch implementation. */ 00134 #define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg) 00135 void sys_mbox_free(sys_mbox_t mbox); 00136 void sys_mbox_fetch(sys_mbox_t mbox, void **msg); 00137 00138 /* Thread functions. */ 00139 sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg), void *arg, int stacksize, int prio); 00140 00141 #endif /* NO_SYS */ 00142 00143 /** Returns the current time in milliseconds. */ 00144 u32_t sys_now(void); 00145 00146 /* Critical Region Protection */ 00147 /* These functions must be implemented in the sys_arch.c file. 00148 In some implementations they can provide a more light-weight protection 00149 mechanism than using semaphores. Otherwise semaphores can be used for 00150 implementation */ 00151 #ifndef SYS_ARCH_PROTECT 00152 /** SYS_LIGHTWEIGHT_PROT 00153 * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection 00154 * for certain critical regions during buffer allocation, deallocation and memory 00155 * allocation and deallocation. 00156 */ 00157 #if SYS_LIGHTWEIGHT_PROT 00158 00159 /** SYS_ARCH_DECL_PROTECT 00160 * declare a protection variable. This macro will default to defining a variable of 00161 * type sys_prot_t. If a particular port needs a different implementation, then 00162 * this macro may be defined in sys_arch.h. 00163 */ 00164 #define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev 00165 /** SYS_ARCH_PROTECT 00166 * Perform a "fast" protect. This could be implemented by 00167 * disabling interrupts for an embedded system or by using a semaphore or 00168 * mutex. The implementation should allow calling SYS_ARCH_PROTECT when 00169 * already protected. The old protection level is returned in the variable 00170 * "lev". This macro will default to calling the sys_arch_protect() function 00171 * which should be implemented in sys_arch.c. If a particular port needs a 00172 * different implementation, then this macro may be defined in sys_arch.h 00173 */ 00174 #define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect() 00175 /** SYS_ARCH_UNPROTECT 00176 * Perform a "fast" set of the protection level to "lev". This could be 00177 * implemented by setting the interrupt level to "lev" within the MACRO or by 00178 * using a semaphore or mutex. This macro will default to calling the 00179 * sys_arch_unprotect() function which should be implemented in 00180 * sys_arch.c. If a particular port needs a different implementation, then 00181 * this macro may be defined in sys_arch.h 00182 */ 00183 #define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev) 00184 sys_prot_t sys_arch_protect(void); 00185 void sys_arch_unprotect(sys_prot_t pval); 00186 00187 #else 00188 00189 #define SYS_ARCH_DECL_PROTECT(lev) 00190 #define SYS_ARCH_PROTECT(lev) 00191 #define SYS_ARCH_UNPROTECT(lev) 00192 00193 #endif /* SYS_LIGHTWEIGHT_PROT */ 00194 00195 #endif /* SYS_ARCH_PROTECT */ 00196 00197 /* 00198 * Macros to set/get and increase/decrease variables in a thread-safe way. 00199 * Use these for accessing variable that are used from more than one thread. 00200 */ 00201 00202 #ifndef SYS_ARCH_INC 00203 #define SYS_ARCH_INC(var, val) do { \ 00204 SYS_ARCH_DECL_PROTECT(old_level); \ 00205 SYS_ARCH_PROTECT(old_level); \ 00206 var += val; \ 00207 SYS_ARCH_UNPROTECT(old_level); \ 00208 } while(0) 00209 #endif /* SYS_ARCH_INC */ 00210 00211 #ifndef SYS_ARCH_DEC 00212 #define SYS_ARCH_DEC(var, val) do { \ 00213 SYS_ARCH_DECL_PROTECT(old_level); \ 00214 SYS_ARCH_PROTECT(old_level); \ 00215 var -= val; \ 00216 SYS_ARCH_UNPROTECT(old_level); \ 00217 } while(0) 00218 #endif /* SYS_ARCH_DEC */ 00219 00220 #ifndef SYS_ARCH_GET 00221 #define SYS_ARCH_GET(var, ret) do { \ 00222 SYS_ARCH_DECL_PROTECT(old_level); \ 00223 SYS_ARCH_PROTECT(old_level); \ 00224 ret = var; \ 00225 SYS_ARCH_UNPROTECT(old_level); \ 00226 } while(0) 00227 #endif /* SYS_ARCH_GET */ 00228 00229 #ifndef SYS_ARCH_SET 00230 #define SYS_ARCH_SET(var, val) do { \ 00231 SYS_ARCH_DECL_PROTECT(old_level); \ 00232 SYS_ARCH_PROTECT(old_level); \ 00233 var = val; \ 00234 SYS_ARCH_UNPROTECT(old_level); \ 00235 } while(0) 00236 #endif /* SYS_ARCH_SET */ 00237 00238 00239 #ifdef __cplusplus 00240 } 00241 #endif 00242 00243 #endif /* __LWIP_SYS_H__ */
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