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 mac_addr[19];
00035 static char ip_addr[17] = "\0";
00036 static bool use_dhcp = false;
00037 
00038 static Semaphore tcpip_inited(0);
00039 static Semaphore netif_linked(0);
00040 static Semaphore netif_up(0);
00041 
00042 static void tcpip_init_done(void *arg) {
00043     tcpip_inited.release();
00044 }
00045 
00046 static void netif_link_callback(struct netif *netif) {
00047     if (netif_is_link_up(netif)) {
00048         netif_linked.release();
00049     }
00050 }
00051 
00052 static void netif_status_callback(struct netif *netif) {
00053     if (netif_is_up(netif)) {
00054         strcpy(ip_addr, inet_ntoa(netif->ip_addr));
00055         netif_up.release();
00056     }
00057 }
00058 
00059 static void init_netif(ip_addr_t *ipaddr, ip_addr_t *netmask, ip_addr_t *gw) {
00060     tcpip_init(tcpip_init_done, NULL);
00061     tcpip_inited.wait();
00062     
00063     memset((void*) &lpcNetif, 0, sizeof(lpcNetif));
00064     netif_add(&lpcNetif, ipaddr, netmask, gw, NULL, lpc_enetif_init, tcpip_input);
00065     netif_set_default(&lpcNetif);
00066     
00067     netif_set_link_callback  (&lpcNetif, netif_link_callback);
00068     netif_set_status_callback(&lpcNetif, netif_status_callback);
00069 }
00070 
00071 static void set_mac_address(void) {
00072     char mac[6];
00073     mbed_mac_address(mac);
00074     snprintf(mac_addr, 19, "%02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
00075 }
00076 
00077 int EthernetInterface::init() {
00078     use_dhcp = true;
00079     set_mac_address();
00080     init_netif(NULL, NULL, NULL);
00081     return 0;
00082 }
00083 
00084 int EthernetInterface::init(const char* ip, const char* mask, const char* gateway) {
00085     use_dhcp = false;
00086     
00087     set_mac_address();
00088     strcpy(ip_addr, ip);
00089     
00090     ip_addr_t ip_n, mask_n, gateway_n;
00091     inet_aton(ip, &ip_n);
00092     inet_aton(mask, &mask_n);
00093     inet_aton(gateway, &gateway_n);
00094     init_netif(&ip_n, &mask_n, &gateway_n);
00095     
00096     return 0;
00097 }
00098 
00099 int EthernetInterface::connect(unsigned int timeout_ms) {
00100     NVIC_SetPriority(ENET_IRQn, ((0x01 << 3) | 0x01));
00101     NVIC_EnableIRQ(ENET_IRQn);
00102     
00103     int inited;
00104     if (use_dhcp) {
00105         dhcp_start(&lpcNetif);
00106         
00107         // Wait for an IP Address
00108         // -1: error, 0: timeout
00109         inited = netif_up.wait(timeout_ms);
00110     } else {
00111         netif_set_up(&lpcNetif);
00112         
00113         // Wait for the link up
00114         inited = netif_linked.wait(timeout_ms);
00115     }
00116     
00117     return (inited > 0) ? (0) : (-1);
00118 }
00119 
00120 int EthernetInterface::disconnect() {
00121     if (use_dhcp) {
00122         dhcp_release(&lpcNetif);
00123         dhcp_stop(&lpcNetif);
00124     } else {
00125         netif_set_down(&lpcNetif);
00126     }
00127     
00128     NVIC_DisableIRQ(ENET_IRQn);
00129     
00130     return 0;
00131 }
00132 
00133 char* EthernetInterface::getMACAddress() {
00134     return mac_addr;
00135 }
00136 
00137 char* EthernetInterface::getIPAddress() {
00138     return ip_addr;
00139 }