Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
tcpip.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_TCPIP_H__ 00033 #define __LWIP_TCPIP_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #if !NO_SYS /* don't build if not configured for use in lwipopts.h */ 00038 00039 #include "lwip/api_msg.h" 00040 #include "lwip/netifapi.h" 00041 #include "lwip/pbuf.h" 00042 #include "lwip/api.h" 00043 #include "lwip/sys.h" 00044 #include "lwip/netif.h" 00045 00046 #ifdef __cplusplus 00047 extern "C" { 00048 #endif 00049 00050 #if LWIP_TCPIP_CORE_LOCKING 00051 /** The global semaphore to lock the stack. */ 00052 extern sys_sem_t lock_tcpip_core; 00053 #define LOCK_TCPIP_CORE() sys_sem_wait(lock_tcpip_core) 00054 #define UNLOCK_TCPIP_CORE() sys_sem_signal(lock_tcpip_core) 00055 #define TCPIP_APIMSG(m) tcpip_apimsg_lock(m) 00056 #define TCPIP_APIMSG_ACK(m) 00057 #define TCPIP_NETIFAPI(m) tcpip_netifapi_lock(m) 00058 #define TCPIP_NETIFAPI_ACK(m) 00059 #else 00060 #define LOCK_TCPIP_CORE() 00061 #define UNLOCK_TCPIP_CORE() 00062 #define TCPIP_APIMSG(m) tcpip_apimsg(m) 00063 #define TCPIP_APIMSG_ACK(m) sys_sem_signal(m->conn->op_completed) 00064 #define TCPIP_NETIFAPI(m) tcpip_netifapi(m) 00065 #define TCPIP_NETIFAPI_ACK(m) sys_sem_signal(m->sem) 00066 #endif /* LWIP_TCPIP_CORE_LOCKING */ 00067 00068 void tcpip_init(void (* tcpip_init_done)(void *), void *arg); 00069 00070 #if LWIP_NETCONN 00071 err_t tcpip_apimsg(struct api_msg *apimsg); 00072 #if LWIP_TCPIP_CORE_LOCKING 00073 err_t tcpip_apimsg_lock(struct api_msg *apimsg); 00074 #endif /* LWIP_TCPIP_CORE_LOCKING */ 00075 #endif /* LWIP_NETCONN */ 00076 00077 err_t tcpip_input(struct pbuf *p, struct netif *inp); 00078 00079 #if LWIP_NETIF_API 00080 err_t tcpip_netifapi(struct netifapi_msg *netifapimsg); 00081 #if LWIP_TCPIP_CORE_LOCKING 00082 err_t tcpip_netifapi_lock(struct netifapi_msg *netifapimsg); 00083 #endif /* LWIP_TCPIP_CORE_LOCKING */ 00084 #endif /* LWIP_NETIF_API */ 00085 00086 err_t tcpip_callback_with_block(void (*f)(void *ctx), void *ctx, u8_t block); 00087 #define tcpip_callback(f, ctx) tcpip_callback_with_block(f, ctx, 1) 00088 00089 /* free pbufs or heap memory from another context without blocking */ 00090 err_t pbuf_free_callback(struct pbuf *p); 00091 err_t mem_free_callback(void *m); 00092 00093 err_t tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg); 00094 err_t tcpip_untimeout(sys_timeout_handler h, void *arg); 00095 00096 enum tcpip_msg_type { 00097 #if LWIP_NETCONN 00098 TCPIP_MSG_API, 00099 #endif /* LWIP_NETCONN */ 00100 TCPIP_MSG_INPKT, 00101 #if LWIP_NETIF_API 00102 TCPIP_MSG_NETIFAPI, 00103 #endif /* LWIP_NETIF_API */ 00104 TCPIP_MSG_CALLBACK, 00105 TCPIP_MSG_TIMEOUT, 00106 TCPIP_MSG_UNTIMEOUT 00107 }; 00108 00109 struct tcpip_msg { 00110 enum tcpip_msg_type type; 00111 sys_sem_t *sem; 00112 union { 00113 #if LWIP_NETCONN 00114 struct api_msg *apimsg; 00115 #endif /* LWIP_NETCONN */ 00116 #if LWIP_NETIF_API 00117 struct netifapi_msg *netifapimsg; 00118 #endif /* LWIP_NETIF_API */ 00119 struct { 00120 struct pbuf *p; 00121 struct netif *netif; 00122 } inp; 00123 struct { 00124 void (*f)(void *ctx); 00125 void *ctx; 00126 } cb; 00127 struct { 00128 u32_t msecs; 00129 sys_timeout_handler h; 00130 void *arg; 00131 } tmo; 00132 } msg; 00133 }; 00134 00135 #ifdef __cplusplus 00136 } 00137 #endif 00138 00139 #endif /* !NO_SYS */ 00140 00141 #endif /* __LWIP_TCPIP_H__ */
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