This is WIZnet Ethernet Interface using Hardware TCP/IP chip, W5500, W5200 and W5100. One of them can be selected by enabling it in wiznet.h.

Dependents:   Embedded_web EmailButton EmailButton HTTPClient_Weather ... more

other drivers

for only W5500 / WIZ550io user, you could use

Import libraryW5500Interface

This is the Interface library for WIZnet W5500 chip which forked of EthernetInterfaceW5500, WIZnetInterface and WIZ550ioInterface. This library has simple name as "W5500Interface". and can be used for Wiz550io users also.

WIZnetInterface/Socket/UDPSocket.cpp

Committer:
Bongjun
Date:
2014-10-06
Revision:
5:89edb39d8707
Parent:
0:b72d22e10709

File content as of revision 5:89edb39d8707:

/* Copyright (C) 2012 mbed.org, MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "UDPSocket.h"

static int udp_local_port;

UDPSocket::UDPSocket()
{
}

// After init function, bind() should be called.
int UDPSocket::init(void)
{
    if (_sock_fd < 0) {
        _sock_fd = eth->new_socket();
    }
    if (eth->setProtocol(_sock_fd, UDP) == false) return -1;
    return 0;
}

// Server initialization
int UDPSocket::bind(int port)
{
    if (_sock_fd < 0) {
        _sock_fd = eth->new_socket();
        if (_sock_fd < 0) {
            return -1;
        }
    }
    // set local port
    if (port != 0) {
        eth->sreg<uint16_t>(_sock_fd, Sn_PORT, port);
    } else {
        udp_local_port++;
        eth->sreg<uint16_t>(_sock_fd, Sn_PORT, udp_local_port);
    }
    // set udp protocol
    eth->setProtocol(_sock_fd, UDP);
    eth->scmd(_sock_fd, OPEN);
    return 0;
}

// -1 if unsuccessful, else number of bytes written
int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
{
    int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout, length-1);
    if (size < 0) {
        return -1;
    }
    confEndpoint(remote);
    int ret = eth->send(_sock_fd, packet, length);
    return ret;
}

// -1 if unsuccessful, else number of bytes received
int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
{
    uint8_t info[8];
    int size = eth->wait_readable(_sock_fd, _blocking ? -1 : _timeout, sizeof(info));
    if (size < 0) {
        return -1;
    }
    eth->recv(_sock_fd, (char*)info, sizeof(info));
    readEndpoint(remote, info);
    int udp_size = info[6]<<8|info[7];
    //TEST_ASSERT(udp_size <= (size-sizeof(info)));
    if (udp_size > (size-sizeof(info))) {
        return -1;
    }

    /* Perform Length check here to prevent buffer overrun */
    /* fixed by Sean Newton (https://developer.mbed.org/users/SeanNewton/) */
    if (udp_size > length) {
        //printf("udp_size: %d\n",udp_size);
        return -1;
    }
    return eth->recv(_sock_fd, buffer, udp_size);
}

void UDPSocket::confEndpoint(Endpoint & ep)
{
    char * host = ep.get_address();
    // set remote host
    eth->sreg_ip(_sock_fd, Sn_DIPR, host);
    // set remote port
    eth->sreg<uint16_t>(_sock_fd, Sn_DPORT, ep.get_port());
}

void UDPSocket::readEndpoint(Endpoint & ep, uint8_t info[])
{
    char addr[17];
    snprintf(addr, sizeof(addr), "%d.%d.%d.%d", info[0], info[1], info[2], info[3]);
    uint16_t port = info[4]<<8|info[5];
    ep.set_address(addr, port);
}