EthernetInterface.cpp

00001 /* EthernetInterface.cpp */
00002 /* Copyright (C) 2012 mbed.org, MIT License
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00005  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00006  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00007  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00008  * furnished to do so, subject to the following conditions:
00009  *
00010  * The above copyright notice and this permission notice shall be included in all copies or
00011  * substantial portions of the Software.
00012  *
00013  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00014  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00015  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00016  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00017  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00018  */
00019 #include "EthernetInterface.h"
00020 
00021 #include "lwip/inet.h"
00022 #include "lwip/netif.h"
00023 #include "netif/etharp.h"
00024 #include "lwip/dhcp.h"
00025 #include "arch/lpc17_emac.h"
00026 #include "lpc_phy.h"
00027 #include "lwip/tcpip.h"
00028 
00029 #include "mbed.h"
00030 
00031 /* TCP/IP and Network Interface Initialisation */
00032 static struct netif lpcNetif;
00033 
00034 static char ip_addr[16] = "\0";
00035 static bool use_dhcp = false;
00036 
00037 static Semaphore tcpip_inited(0);
00038 static Semaphore netif_linked(0);
00039 static Semaphore netif_up(0);
00040 
00041 static void tcpip_init_done(void *arg) {
00042     tcpip_inited.release();
00043 }
00044 
00045 static void netif_link_callback(struct netif *netif) {
00046     if (netif_is_link_up(netif)) {
00047         netif_linked.release();
00048     }
00049 }
00050 
00051 static void netif_status_callback(struct netif *netif) {
00052     if (netif_is_up(netif)) {
00053         strcpy(ip_addr, inet_ntoa(netif->ip_addr));
00054         netif_up.release();
00055     }
00056 }
00057 
00058 static void init_netif(ip_addr_t *ipaddr, ip_addr_t *netmask, ip_addr_t *gw) {
00059     tcpip_init(tcpip_init_done, NULL);
00060     tcpip_inited.wait();
00061     
00062     memset((void*) &lpcNetif, 0, sizeof(lpcNetif));
00063     netif_add(&lpcNetif, ipaddr, netmask, gw, NULL, lpc_enetif_init, tcpip_input);
00064     netif_set_default(&lpcNetif);
00065     
00066     netif_set_link_callback  (&lpcNetif, netif_link_callback);
00067     netif_set_status_callback(&lpcNetif, netif_status_callback);
00068 }
00069 
00070 int EthernetInterface::init() {
00071     use_dhcp = true;
00072     init_netif(NULL, NULL, NULL);
00073     return 0;
00074 }
00075 
00076 int EthernetInterface::init(const char* ip, const char* mask, const char* gateway) {
00077     use_dhcp = false;
00078     strcpy(ip_addr, ip);
00079     
00080     ip_addr_t ip_n, mask_n, gateway_n;
00081     inet_aton(ip, &ip_n);
00082     inet_aton(mask, &mask_n);
00083     inet_aton(gateway, &gateway_n);
00084     init_netif(&ip_n, &mask_n, &gateway_n);
00085     
00086     return 0;
00087 }
00088 
00089 int EthernetInterface::connect(unsigned int timeout_ms) {
00090     NVIC_SetPriority(ENET_IRQn, ((0x01 << 3) | 0x01));
00091     NVIC_EnableIRQ(ENET_IRQn);
00092     
00093     int inited;
00094     if (use_dhcp) {
00095         dhcp_start(&lpcNetif);
00096         
00097         // Wait for an IP
00098         // -1: error, 0: timeout
00099         inited = netif_up.wait(timeout_ms);
00100     } else {
00101         netif_set_up(&lpcNetif);
00102         
00103         // Wait for the link up
00104         inited = netif_linked.wait(timeout_ms);
00105     }
00106     
00107     return (inited > 0) ? (0) : (-1);
00108 }
00109 
00110 int EthernetInterface::disconnect() {
00111     if (use_dhcp) {
00112         dhcp_release(&lpcNetif);
00113         dhcp_stop(&lpcNetif);
00114     } else {
00115         netif_set_down(&lpcNetif);
00116     }
00117     
00118     NVIC_DisableIRQ(ENET_IRQn);
00119     
00120     return 0;
00121 }
00122 
00123 char* EthernetInterface::getIPAddress() {
00124     return ip_addr;
00125 }