Posted on May 21, 2012 at 23:33
Hi,
I use LwIP TCP/IP stack demonstration for STM32F407/STM32F417 microcontrollers that Iconfigured to work with my STM32F4 discovery board.
I tested the TCP/UDP echo server application based on netconn API (Application running with the FreeRTOS ) and I have a problem.
static
void
udpecho_thread(
void
*arg)
{
err_t err;
LWIP_UNUSED_ARG(arg);
conn = netconn_new(NETCONN_UDP);
if
(conn!= NULL)
{
err = netconn_bind(conn, IP_ADDR_ANY, 7);
if
(err == ERR_OK)
{
while
(1)
{
buf = netconn_recv(conn);
if
(buf!= NULL)
{
addr = netbuf_fromaddr(buf);
port = netbuf_fromport(buf);
netconn_connect(conn, addr, port);
buf->addr = NULL;
netconn_send(conn,buf);
netbuf_delete(buf);
}
}
}
else
{
printf
(
''can not bind netconn''
);
}
}
else
{
printf
(
''can create new UDP netconn''
);
}
}
At first, the board correctly returns the first 4 frames received and then it loses the udp network. When I debugged I realized that the program remains blocked in the function
buf = netconn_recv(conn) but I don't know why ??
I supposed that this function takes a semaphore each time it receives a udp frame and after a time it can not take the semaphore but why !!!!
If anyone has had this problem thank you for his help.
Ronan.
