Adam Green / Mbed 2 deprecated WeatherStation

Web server based weather station using Sparkfun Weather Meters.

Dependencies:   FatFileSystem mbed WeatherMeters SDFileSystem

network.cpp@1:c7958aa34fa1, 2012-02-25 (annotated)

Committer:
AdamGreen
Date:
Sat Feb 25 03:28:05 2012 +0000
Revision:
1:c7958aa34fa1
Parent:
0:616601bde9fb 
Use published libraries where possible.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:616601bde9fb 1 /* Copyright 2011 Adam Green (http://mbed.org/users/AdamGreen/)
AdamGreen 0:616601bde9fb 2
AdamGreen 0:616601bde9fb 3 Licensed under the Apache License, Version 2.0 (the "License");
AdamGreen 0:616601bde9fb 4 you may not use this file except in compliance with the License.
AdamGreen 0:616601bde9fb 5 You may obtain a copy of the License at
AdamGreen 0:616601bde9fb 6
AdamGreen 0:616601bde9fb 7 http://www.apache.org/licenses/LICENSE-2.0
AdamGreen 0:616601bde9fb 8
AdamGreen 0:616601bde9fb 9 Unless required by applicable law or agreed to in writing, software
AdamGreen 0:616601bde9fb 10 distributed under the License is distributed on an "AS IS" BASIS,
AdamGreen 0:616601bde9fb 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AdamGreen 0:616601bde9fb 12 See the License for the specific language governing permissions and
AdamGreen 0:616601bde9fb 13 limitations under the License.
AdamGreen 0:616601bde9fb 14 */
AdamGreen 0:616601bde9fb 15 /* Implementation of core lwIP ethernet functionality. */
AdamGreen 0:616601bde9fb 16 #include <mbed.h>
AdamGreen 0:616601bde9fb 17 #include "lwip/init.h"
AdamGreen 0:616601bde9fb 18 #include "lwip/tcp_impl.h"
AdamGreen 0:616601bde9fb 19 #include "lwip/dns.h"
AdamGreen 0:616601bde9fb 20 #include "netif/etharp.h"
AdamGreen 0:616601bde9fb 21 #include "drv/eth/eth_drv.h"
AdamGreen 0:616601bde9fb 22 #include "network.h"
AdamGreen 0:616601bde9fb 23 #include "debug.h"
AdamGreen 0:616601bde9fb 24
AdamGreen 0:616601bde9fb 25
AdamGreen 0:616601bde9fb 26 /* Initializes the network stack.
AdamGreen 0:616601bde9fb 27
AdamGreen 0:616601bde9fb 28 NOTE: Using DHCP to supply the IP addresses is the only supported scenario
AdamGreen 0:616601bde9fb 29 in this sample.
AdamGreen 0:616601bde9fb 30
AdamGreen 0:616601bde9fb 31 Parameters:
AdamGreen 0:616601bde9fb 32 pNetwork is a pointer to the network object to be initialized.
AdamGreen 0:616601bde9fb 33 pIPAddress is a pointer to the string which specifies the static IP address
AdamGreen 0:616601bde9fb 34 of this node. Set to NULL for DHCP.
AdamGreen 0:616601bde9fb 35 pSubnetMask is a pointer to the string which specifies the subnet mask for
AdamGreen 0:616601bde9fb 36 static IP addresses. Set to NULL for DHCP.
AdamGreen 0:616601bde9fb 37 pGatewayAddress is a pointer to the string which specifies the static
AdamGreen 0:616601bde9fb 38 gateway IP address. Set to NULL for DHCP.
AdamGreen 0:616601bde9fb 39 pHostName is the host name to be used for representing this device to the
AdamGreen 0:616601bde9fb 40 DHCP server.
AdamGreen 0:616601bde9fb 41
AdamGreen 0:616601bde9fb 42 Returns:
AdamGreen 0:616601bde9fb 43 0 on success and a positive error code otherwise.
AdamGreen 0:616601bde9fb 44 */
AdamGreen 0:616601bde9fb 45 int SNetwork_Init(SNetwork* pNetwork,
AdamGreen 0:616601bde9fb 46 const char* pIPAddress,
AdamGreen 0:616601bde9fb 47 const char* pSubnetMask,
AdamGreen 0:616601bde9fb 48 const char* pGatewayAddress,
AdamGreen 0:616601bde9fb 49 const char* pHostName)
AdamGreen 0:616601bde9fb 50 {
AdamGreen 0:616601bde9fb 51 int Return = 1;
AdamGreen 0:616601bde9fb 52 netif* pAddResult = NULL;
AdamGreen 0:616601bde9fb 53 ip_addr_t IpAddress;
AdamGreen 0:616601bde9fb 54 ip_addr_t NetMask;
AdamGreen 0:616601bde9fb 55 ip_addr_t GatewayAddress;
AdamGreen 0:616601bde9fb 56 Timer Timeout;
AdamGreen 0:616601bde9fb 57
AdamGreen 0:616601bde9fb 58 // Must specify a network object to be initialized.
AdamGreen 0:616601bde9fb 59 assert ( pNetwork );
AdamGreen 0:616601bde9fb 60
AdamGreen 0:616601bde9fb 61 // Clear out the network object and fill it in during the initialization
AdamGreen 0:616601bde9fb 62 // process.
AdamGreen 0:616601bde9fb 63 memset(pNetwork, 0, sizeof(*pNetwork));
AdamGreen 0:616601bde9fb 64
AdamGreen 0:616601bde9fb 65 // Initialize the lwIP network stack.
AdamGreen 0:616601bde9fb 66 lwip_init();
AdamGreen 0:616601bde9fb 67
AdamGreen 0:616601bde9fb 68 // Set the initial IP addresses for the ethernet interface based on whether
AdamGreen 0:616601bde9fb 69 // DHCP is to be used or not.
AdamGreen 0:616601bde9fb 70 if (pIPAddress)
AdamGreen 0:616601bde9fb 71 {
AdamGreen 0:616601bde9fb 72 // For static IP, all strings must be set.
AdamGreen 0:616601bde9fb 73 assert ( pSubnetMask && pGatewayAddress );
AdamGreen 0:616601bde9fb 74
AdamGreen 0:616601bde9fb 75 ip4_addr_set_u32(&IpAddress, ipaddr_addr(pIPAddress));
AdamGreen 0:616601bde9fb 76 ip4_addr_set_u32(&NetMask, ipaddr_addr(pSubnetMask));
AdamGreen 0:616601bde9fb 77 ip4_addr_set_u32(&GatewayAddress, ipaddr_addr(pGatewayAddress));
AdamGreen 0:616601bde9fb 78 }
AdamGreen 0:616601bde9fb 79 else
AdamGreen 0:616601bde9fb 80 {
AdamGreen 0:616601bde9fb 81 // For DHCP, all strings must be NULL.
AdamGreen 0:616601bde9fb 82 assert ( !pSubnetMask && !pGatewayAddress );
AdamGreen 0:616601bde9fb 83
AdamGreen 0:616601bde9fb 84 // Clear the IP addresses and use DHCP instead.
AdamGreen 0:616601bde9fb 85 ip_addr_set_zero(&IpAddress);
AdamGreen 0:616601bde9fb 86 ip_addr_set_zero(&NetMask);
AdamGreen 0:616601bde9fb 87 ip_addr_set_zero(&GatewayAddress);
AdamGreen 0:616601bde9fb 88 }
AdamGreen 0:616601bde9fb 89
AdamGreen 0:616601bde9fb 90 // Obtain the MAC address for the Ethernet device.
AdamGreen 0:616601bde9fb 91 // NOTE: This should really be done in eth_init()
AdamGreen 0:616601bde9fb 92 pNetwork->EthernetInterface.hwaddr_len = ETHARP_HWADDR_LEN;
AdamGreen 0:616601bde9fb 93 eth_address((char *)pNetwork->EthernetInterface.hwaddr);
AdamGreen 0:616601bde9fb 94
AdamGreen 0:616601bde9fb 95 // Connect the LPC17xx ethernet driver into the lwIP stack.
AdamGreen 0:616601bde9fb 96 pAddResult = netif_add(&pNetwork->EthernetInterface,
AdamGreen 0:616601bde9fb 97 &IpAddress,
AdamGreen 0:616601bde9fb 98 &NetMask,
AdamGreen 0:616601bde9fb 99 &GatewayAddress,
AdamGreen 0:616601bde9fb 100 NULL,
AdamGreen 0:616601bde9fb 101 eth_init,
AdamGreen 0:616601bde9fb 102 ethernet_input);
AdamGreen 0:616601bde9fb 103 if (!pAddResult)
AdamGreen 0:616601bde9fb 104 {
AdamGreen 0:616601bde9fb 105 printf("error: Failed to add ethernet interface to lwIP.\r\n");
AdamGreen 0:616601bde9fb 106 goto Error;
AdamGreen 0:616601bde9fb 107 }
AdamGreen 0:616601bde9fb 108 netif_set_default(&pNetwork->EthernetInterface);
AdamGreen 0:616601bde9fb 109
AdamGreen 0:616601bde9fb 110 // Start the required timers.
AdamGreen 0:616601bde9fb 111 pNetwork->ARP.start();
AdamGreen 0:616601bde9fb 112 pNetwork->DHCPCoarse.start();
AdamGreen 0:616601bde9fb 113 pNetwork->DHCPFine.start();
AdamGreen 0:616601bde9fb 114 pNetwork->TCP.start();
AdamGreen 0:616601bde9fb 115 pNetwork->DNS.start();
AdamGreen 0:616601bde9fb 116
AdamGreen 0:616601bde9fb 117 if (pIPAddress)
AdamGreen 0:616601bde9fb 118 {
AdamGreen 0:616601bde9fb 119 // Start the ethernet interface up with the static IP address.
AdamGreen 0:616601bde9fb 120 netif_set_up(&pNetwork->EthernetInterface);
AdamGreen 0:616601bde9fb 121 }
AdamGreen 0:616601bde9fb 122 else
AdamGreen 0:616601bde9fb 123 {
AdamGreen 0:616601bde9fb 124 err_t StartResult;
AdamGreen 0:616601bde9fb 125
AdamGreen 0:616601bde9fb 126 // Start the DHCP request.
AdamGreen 0:616601bde9fb 127 pNetwork->EthernetInterface.hostname = (char*)pHostName;
AdamGreen 0:616601bde9fb 128 dhcp_set_struct(&pNetwork->EthernetInterface, &pNetwork->DHCP);
AdamGreen 0:616601bde9fb 129 StartResult = dhcp_start(&pNetwork->EthernetInterface);
AdamGreen 0:616601bde9fb 130 if (ERR_OK != StartResult)
AdamGreen 0:616601bde9fb 131 {
AdamGreen 0:616601bde9fb 132 printf("error: Failed to start DHCP service.\r\n");
AdamGreen 0:616601bde9fb 133 goto Error;
AdamGreen 0:616601bde9fb 134 }
AdamGreen 0:616601bde9fb 135 }
AdamGreen 0:616601bde9fb 136
AdamGreen 0:616601bde9fb 137 // Wait for network to startup.
AdamGreen 0:616601bde9fb 138 Timeout.start();
AdamGreen 0:616601bde9fb 139 printf("Waiting for network...\r\n");
AdamGreen 0:616601bde9fb 140
AdamGreen 0:616601bde9fb 141 // Wait until interface is up
AdamGreen 0:616601bde9fb 142 while (!netif_is_up(&pNetwork->EthernetInterface))
AdamGreen 0:616601bde9fb 143 {
AdamGreen 0:616601bde9fb 144 SNetwork_Poll(pNetwork);
AdamGreen 0:616601bde9fb 145
AdamGreen 0:616601bde9fb 146 // Stop program if we get a timeout on DHCP attempt.
AdamGreen 0:616601bde9fb 147 if (Timeout.read_ms() > 10000)
AdamGreen 0:616601bde9fb 148 {
AdamGreen 0:616601bde9fb 149 printf("error: Timeout while waiting for network to initialize.\r\n");
AdamGreen 0:616601bde9fb 150 goto Error;
AdamGreen 0:616601bde9fb 151 }
AdamGreen 0:616601bde9fb 152 }
AdamGreen 0:616601bde9fb 153
AdamGreen 0:616601bde9fb 154 // Print out the DHCP provided IP addresses.
AdamGreen 0:616601bde9fb 155 printf("IP : ");
AdamGreen 0:616601bde9fb 156 SNetwork_PrintAddress(&pNetwork->EthernetInterface.ip_addr);
AdamGreen 0:616601bde9fb 157 printf("\r\n");
AdamGreen 0:616601bde9fb 158
AdamGreen 0:616601bde9fb 159 printf("Gateway: ");
AdamGreen 0:616601bde9fb 160 SNetwork_PrintAddress(&pNetwork->EthernetInterface.gw);
AdamGreen 0:616601bde9fb 161 printf("\r\n");
AdamGreen 0:616601bde9fb 162
AdamGreen 0:616601bde9fb 163 printf("Mask : ");
AdamGreen 0:616601bde9fb 164 SNetwork_PrintAddress(&pNetwork->EthernetInterface.netmask);
AdamGreen 0:616601bde9fb 165 printf("\r\n");
AdamGreen 0:616601bde9fb 166
AdamGreen 0:616601bde9fb 167 Return = 0;
AdamGreen 0:616601bde9fb 168 Error:
AdamGreen 0:616601bde9fb 169 return Return;
AdamGreen 0:616601bde9fb 170 }
AdamGreen 0:616601bde9fb 171
AdamGreen 0:616601bde9fb 172
AdamGreen 0:616601bde9fb 173 /* Called from within the main application loop to perform network maintenance
AdamGreen 0:616601bde9fb 174 tasks at appropriate time intervals and execute the ethernet driver which
AdamGreen 0:616601bde9fb 175 will push new network packets into the lwIP stack. lwIP will then call into
AdamGreen 0:616601bde9fb 176 the callbacks which have been configured by this application.
AdamGreen 0:616601bde9fb 177
AdamGreen 0:616601bde9fb 178 Parameters:
AdamGreen 0:616601bde9fb 179 pNetwork is a pointer to the intitialized network object.
AdamGreen 0:616601bde9fb 180
AdamGreen 0:616601bde9fb 181 Returns:
AdamGreen 0:616601bde9fb 182 Number of network tasks run during this polling process. If 0 then no
AdamGreen 0:616601bde9fb 183 network related tasks were completed during this polling iteration.
AdamGreen 0:616601bde9fb 184 */
AdamGreen 0:616601bde9fb 185 int SNetwork_Poll(SNetwork* pNetwork)
AdamGreen 0:616601bde9fb 186 {
AdamGreen 0:616601bde9fb 187 int TasksRun = 0;
AdamGreen 0:616601bde9fb 188
AdamGreen 0:616601bde9fb 189 // Validate parameters.
AdamGreen 0:616601bde9fb 190 assert ( pNetwork );
AdamGreen 0:616601bde9fb 191
AdamGreen 0:616601bde9fb 192 // Execute timed maintenance tasks.
AdamGreen 0:616601bde9fb 193 if (pNetwork->DHCPFine.read_ms() >= DHCP_FINE_TIMER_MSECS)
AdamGreen 0:616601bde9fb 194 {
AdamGreen 0:616601bde9fb 195 pNetwork->DHCPFine.reset();
AdamGreen 0:616601bde9fb 196 dhcp_fine_tmr();
AdamGreen 0:616601bde9fb 197 TasksRun++;
AdamGreen 0:616601bde9fb 198 }
AdamGreen 0:616601bde9fb 199 if (pNetwork->DHCPCoarse.read() >= DHCP_COARSE_TIMER_SECS)
AdamGreen 0:616601bde9fb 200 {
AdamGreen 0:616601bde9fb 201 pNetwork->DHCPCoarse.reset();
AdamGreen 0:616601bde9fb 202 dhcp_coarse_tmr();
AdamGreen 0:616601bde9fb 203 TasksRun++;
AdamGreen 0:616601bde9fb 204 }
AdamGreen 0:616601bde9fb 205 if (pNetwork->ARP.read_ms() >= ARP_TMR_INTERVAL)
AdamGreen 0:616601bde9fb 206 {
AdamGreen 0:616601bde9fb 207 pNetwork->ARP.reset();
AdamGreen 0:616601bde9fb 208 etharp_tmr();
AdamGreen 0:616601bde9fb 209 TasksRun++;
AdamGreen 0:616601bde9fb 210 }
AdamGreen 0:616601bde9fb 211 if (pNetwork->TCP.read_ms() >= TCP_TMR_INTERVAL)
AdamGreen 0:616601bde9fb 212 {
AdamGreen 0:616601bde9fb 213 pNetwork->TCP.reset();
AdamGreen 0:616601bde9fb 214 tcp_tmr();
AdamGreen 0:616601bde9fb 215 TasksRun++;
AdamGreen 0:616601bde9fb 216 }
AdamGreen 0:616601bde9fb 217 if (pNetwork->DNS.read_ms() >= DNS_TMR_INTERVAL)
AdamGreen 0:616601bde9fb 218 {
AdamGreen 0:616601bde9fb 219 pNetwork->DNS.reset();
AdamGreen 0:616601bde9fb 220 dns_tmr();
AdamGreen 0:616601bde9fb 221 TasksRun++;
AdamGreen 0:616601bde9fb 222 }
AdamGreen 0:616601bde9fb 223
AdamGreen 0:616601bde9fb 224 // Poll the ethernet driver to let it pull packets in and push new packets
AdamGreen 0:616601bde9fb 225 // into the lwIP network stack.
AdamGreen 0:616601bde9fb 226 TasksRun += eth_poll();
AdamGreen 0:616601bde9fb 227
AdamGreen 0:616601bde9fb 228 return TasksRun;
AdamGreen 0:616601bde9fb 229 }
AdamGreen 0:616601bde9fb 230
AdamGreen 0:616601bde9fb 231
AdamGreen 0:616601bde9fb 232 /* Prints out the caller supplied IP address.
AdamGreen 0:616601bde9fb 233
AdamGreen 0:616601bde9fb 234 Parameters:
AdamGreen 0:616601bde9fb 235 pAddress is a pointer to the ip4 address to be displayed.
AdamGreen 0:616601bde9fb 236
AdamGreen 0:616601bde9fb 237 Returns:
AdamGreen 0:616601bde9fb 238 Nothing.
AdamGreen 0:616601bde9fb 239 */
AdamGreen 0:616601bde9fb 240 void SNetwork_PrintAddress(ip_addr_t* pAddress)
AdamGreen 0:616601bde9fb 241 {
AdamGreen 0:616601bde9fb 242 // Validate parameters.
AdamGreen 0:616601bde9fb 243 assert ( pAddress );
AdamGreen 0:616601bde9fb 244
AdamGreen 0:616601bde9fb 245 printf("%d.%d.%d.%d",
AdamGreen 0:616601bde9fb 246 ip4_addr1(pAddress),
AdamGreen 0:616601bde9fb 247 ip4_addr2(pAddress),
AdamGreen 0:616601bde9fb 248 ip4_addr3(pAddress),
AdamGreen 0:616601bde9fb 249 ip4_addr4(pAddress));
AdamGreen 0:616601bde9fb 250 }