Pehr Hovey / Mbed 2 deprecated UDPtest

Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed

Dependencies:   mbed

Core/lwIP/include/lwip/sys.h@0:a548a085de55, 2010-03-14 (annotated)

Committer:
pehrhovey
Date:
Sun Mar 14 00:54:12 2010 +0000
Revision:
0:a548a085de55

        

        
Who changed what in which revision?

        

            
                
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/*





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 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.





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 * All rights reserved. 





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 * 





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 * Redistribution and use in source and binary forms, with or without modification, 





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 * are permitted provided that the following conditions are met:





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 *





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 * 1. Redistributions of source code must retain the above copyright notice,





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 *    this list of conditions and the following disclaimer.





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 * 2. Redistributions in binary form must reproduce the above copyright notice,





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 *    this list of conditions and the following disclaimer in the documentation





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 *    and/or other materials provided with the distribution.





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 * 3. The name of the author may not be used to endorse or promote products





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 *    derived from this software without specific prior written permission. 





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 *





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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 





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 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 





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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 





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 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 





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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 





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 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 





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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 





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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 





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 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 





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 * OF SUCH DAMAGE.





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 *





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 * This file is part of the lwIP TCP/IP stack.





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 * 





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 * Author: Adam Dunkels <adam@sics.se>





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 *





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 */





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#ifndef __LWIP_SYS_H__





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#define __LWIP_SYS_H__





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#include "lwip/opt.h"





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#ifdef __cplusplus





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extern "C" {





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#endif





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#if NO_SYS





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/* For a totally minimal and standalone system, we provide null





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   definitions of the sys_ functions. */





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typedef u8_t sys_sem_t;





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typedef u8_t sys_mbox_t;





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struct sys_timeo {u8_t dummy;};





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#define sys_init()





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#define sys_timeout(m,h,a)





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#define sys_untimeout(m,a)





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#define sys_sem_new(c) c





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#define sys_sem_signal(s)





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#define sys_sem_wait(s)





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#define sys_sem_wait_timeout(s,t)





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#define sys_arch_sem_wait(s,t)





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#define sys_sem_free(s)





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#define sys_mbox_new(s) 0





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#define sys_mbox_fetch(m,d)





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#define sys_mbox_tryfetch(m,d)





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#define sys_mbox_post(m,d)





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#define sys_mbox_trypost(m,d)





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#define sys_mbox_free(m)





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#define sys_thread_new(n,t,a,s,p)





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#else /* NO_SYS */





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/** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */





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#define SYS_ARCH_TIMEOUT 0xffffffffUL





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/* sys_mbox_tryfetch returns SYS_MBOX_EMPTY if appropriate.





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 * For now we use the same magic value, but we allow this to change in future.





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 */





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#define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT 





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#include "lwip/err.h"





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#include "arch/sys_arch.h"





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typedef void (* sys_timeout_handler)(void *arg);





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struct sys_timeo {





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  struct sys_timeo *next;





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  u32_t time;





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  sys_timeout_handler h;





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  void *arg;





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};





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struct sys_timeouts {





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  struct sys_timeo *next;





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};





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/* sys_init() must be called before anthing else. */





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void sys_init(void);





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/*





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 * sys_timeout():





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 *





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 * Schedule a timeout a specified amount of milliseconds in the





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 * future. When the timeout occurs, the specified timeout handler will





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 * be called. The handler will be passed the "arg" argument when





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 * called.





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 *





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 */





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void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg);





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void sys_untimeout(sys_timeout_handler h, void *arg);





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struct sys_timeouts *sys_arch_timeouts(void);





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/* Semaphore functions. */





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sys_sem_t sys_sem_new(u8_t count);





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void sys_sem_signal(sys_sem_t sem);





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u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);





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void sys_sem_free(sys_sem_t sem);





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void sys_sem_wait(sys_sem_t sem);





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int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout);





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/* Time functions. */





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#ifndef sys_msleep





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void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */





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#endif





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#ifndef sys_jiffies





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u32_t sys_jiffies(void); /* since power up. */





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#endif





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/* Mailbox functions. */





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sys_mbox_t sys_mbox_new(int size);





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void sys_mbox_post(sys_mbox_t mbox, void *msg);





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err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg);





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u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);





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#ifndef sys_arch_mbox_tryfetch /* Allow port to override with a macro */





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u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg);





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#endif





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/* For now, we map straight to sys_arch implementation. */





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#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)





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void sys_mbox_free(sys_mbox_t mbox);





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void sys_mbox_fetch(sys_mbox_t mbox, void **msg);





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/* Thread functions. */





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sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg), void *arg, int stacksize, int prio);





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#endif /* NO_SYS */





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/** Returns the current time in milliseconds. */





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u32_t sys_now(void);





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/* Critical Region Protection */





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/* These functions must be implemented in the sys_arch.c file.





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   In some implementations they can provide a more light-weight protection





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   mechanism than using semaphores. Otherwise semaphores can be used for





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   implementation */





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#ifndef SYS_ARCH_PROTECT





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/** SYS_LIGHTWEIGHT_PROT





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 * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection





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 * for certain critical regions during buffer allocation, deallocation and memory





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 * allocation and deallocation.





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 */





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#if SYS_LIGHTWEIGHT_PROT





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/** SYS_ARCH_DECL_PROTECT





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 * declare a protection variable. This macro will default to defining a variable of





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 * type sys_prot_t. If a particular port needs a different implementation, then





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 * this macro may be defined in sys_arch.h.





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 */





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#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev





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/** SYS_ARCH_PROTECT





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 * Perform a "fast" protect. This could be implemented by





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 * disabling interrupts for an embedded system or by using a semaphore or





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 * mutex. The implementation should allow calling SYS_ARCH_PROTECT when





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 * already protected. The old protection level is returned in the variable





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 * "lev". This macro will default to calling the sys_arch_protect() function





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 * which should be implemented in sys_arch.c. If a particular port needs a





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 * different implementation, then this macro may be defined in sys_arch.h





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 */





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#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()





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/** SYS_ARCH_UNPROTECT





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 * Perform a "fast" set of the protection level to "lev". This could be





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 * implemented by setting the interrupt level to "lev" within the MACRO or by





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 * using a semaphore or mutex.  This macro will default to calling the





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 * sys_arch_unprotect() function which should be implemented in





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 * sys_arch.c. If a particular port needs a different implementation, then





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 * this macro may be defined in sys_arch.h





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 */





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#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)





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sys_prot_t sys_arch_protect(void);





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void sys_arch_unprotect(sys_prot_t pval);





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#else





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#define SYS_ARCH_DECL_PROTECT(lev)





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#define SYS_ARCH_PROTECT(lev)





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#define SYS_ARCH_UNPROTECT(lev)





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#endif /* SYS_LIGHTWEIGHT_PROT */





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#endif /* SYS_ARCH_PROTECT */





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/*





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 * Macros to set/get and increase/decrease variables in a thread-safe way.





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 * Use these for accessing variable that are used from more than one thread.





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 */





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#ifndef SYS_ARCH_INC





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#define SYS_ARCH_INC(var, val) do { \





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                                SYS_ARCH_DECL_PROTECT(old_level); \





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                                SYS_ARCH_PROTECT(old_level); \





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                                var += val; \





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                                SYS_ARCH_UNPROTECT(old_level); \





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                              } while(0)





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#endif /* SYS_ARCH_INC */





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#ifndef SYS_ARCH_DEC





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#define SYS_ARCH_DEC(var, val) do { \





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                                SYS_ARCH_DECL_PROTECT(old_level); \





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                                SYS_ARCH_PROTECT(old_level); \





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                                var -= val; \





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                                SYS_ARCH_UNPROTECT(old_level); \





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                              } while(0)





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#endif /* SYS_ARCH_DEC */





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#ifndef SYS_ARCH_GET





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#define SYS_ARCH_GET(var, ret) do { \





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                                SYS_ARCH_DECL_PROTECT(old_level); \





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                                SYS_ARCH_PROTECT(old_level); \





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                                ret = var; \





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                                SYS_ARCH_UNPROTECT(old_level); \





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                              } while(0)





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#endif /* SYS_ARCH_GET */





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#ifndef SYS_ARCH_SET





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#define SYS_ARCH_SET(var, val) do { \





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                                SYS_ARCH_DECL_PROTECT(old_level); \





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                                SYS_ARCH_PROTECT(old_level); \





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                                var = val; \





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                                SYS_ARCH_UNPROTECT(old_level); \





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                              } while(0)





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#endif /* SYS_ARCH_SET */





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#ifdef __cplusplus





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}





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#endif





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#endif /* __LWIP_SYS_H__ */