/* LWIP network stack implementation */
static nsapi_addr_t lwip_getaddr(nsapi_stack_t *stack)
{
if (!lwip_get_ip_address()) {
return (nsapi_addr_t){0};
}
nsapi_addr_t addr;
addr.version = NSAPI_IPv4;
inet_aton(lwip_get_ip_address(), (ip_addr_t *)addr.bytes);
return addr;
}
static int lwip_socket_open(nsapi_stack_t *stack, nsapi_socket_t *handle, nsapi_protocol_t proto)
{
// check if network is connected
if (!lwip_get_ip_address()) {
return NSAPI_ERROR_NO_CONNECTION;
}
// allocate a socket
struct lwip_socket *s = lwip_arena_alloc();
if (!s) {
return NSAPI_ERROR_NO_SOCKET;
}
s->conn = netconn_new_with_callback(
proto == NSAPI_TCP ? NETCONN_TCP : NETCONN_UDP,
lwip_socket_callback);
if (!s->conn) {
lwip_arena_dealloc(s);
return NSAPI_ERROR_NO_SOCKET;
}
netconn_set_recvtimeout(s->conn, 1);
*(struct lwip_socket **)handle = s;
return 0;
}
int lwip_bringdown(void)
{
// Check if we've connected
if (!lwip_get_ip_address()) {
return NSAPI_ERROR_PARAMETER;
}
// Disconnect from the network
dhcp_release(&lwip_netif);
dhcp_stop(&lwip_netif);
lwip_ip_addr[0] = '\0';
return 0;
}
int lwip_bringup(void)
{
// Check if we've already connected
if (lwip_get_ip_address()) {
return NSAPI_ERROR_PARAMETER;
}
// Check if we've already brought up lwip
if (!lwip_get_mac_address()) {
// Set up network
lwip_set_mac_address();
sys_sem_new(&lwip_tcpip_inited, 0);
sys_sem_new(&lwip_netif_linked, 0);
sys_sem_new(&lwip_netif_up, 0);
tcpip_init(lwip_tcpip_init_irq, NULL);
sys_arch_sem_wait(&lwip_tcpip_inited, 0);
memset(&lwip_netif, 0, sizeof lwip_netif);
netif_add(&lwip_netif, 0, 0, 0, NULL, eth_arch_enetif_init, tcpip_input);
netif_set_default(&lwip_netif);
netif_set_link_callback (&lwip_netif, lwip_netif_link_irq);
netif_set_status_callback(&lwip_netif, lwip_netif_status_irq);
eth_arch_enable_interrupts();
}
// Zero out socket set
lwip_arena_init();
// Connect to the network
dhcp_start(&lwip_netif);
// Wait for an IP Address
u32_t ret = sys_arch_sem_wait(&lwip_netif_up, 15000);
if (ret == SYS_ARCH_TIMEOUT) {
return NSAPI_ERROR_DHCP_FAILURE;
}
return 0;
}
const char *EthernetInterface::get_ip_address()
{
return lwip_get_ip_address();
}
