Hi,
I’m
hoping someone can help me with a problem that has
been causing me grief for a few days now!
I
am writing an RTP audio system, that needs to send
a packet of audio data every 4mS. This is in a
multi-thread RTOS environment, running on
STM32F427, with initial code generated using ST’s
“Cube” (wish I hadn’t!). I have threads to handle
NetBIOS and HTTP, but they are all disabled at the
moment.
The
problem I’m having is that after a variable length
of time – sometimes immediately on start-up,
sometimes after half an hour – the code stops
working. The central “netconn_send” returns with
“ERR_USE”. I have tried many variations with this
code, all showing the same problem. None of the
other error warnings get activated, only the GPIO
pins set to indicate the error.
Question
1: Why should send return with ERR_USE? At
present there is only one connection and it is
only bound/connected once – outside the loop. I
get the same error with connection within the
loop, or if I use sendto instead.
Question
2: Why does this supposedly non-fatal error cause
all lower level LWIP functions to stop? If I have
the HTTP thread running (to show status/fault
information) it also stops.
Question
3: Why does not SOF_REUSEADDR mask the error
(SO_REUSE is enabled in lwipopts)?
Many
thanks,
Mike.
void
udp_test(void *arg)
{
struct netconn *conn;
struct netbuf *buf;
char *data;
err_t err;
uint16_t index;
size_t bufsize = 100;
conn = netconn_new(NETCONN_UDP);
if (conn == NULL) debugmessage("Could not create
new netconn for UDP test<br>");
if (conn != NULL)
{
ip_set_option(conn->pcb.udp, SOF_REUSEADDR);
err
= netconn_bind(conn, IP_ADDR_ANY, 5004);
if (err != ERR_OK) debugmessage("Could not bind to
port 5004 for RTP data<br>");
//
err = netconn_connect(conn, IP_ADDR_BROADCAST,
5004);
//
if (err != ERR_OK) debugmessage("Could not connect
port 5004 to BROADCAST for RTP data<br>");
//
while(1)
{
buf = netbuf_new();
if (buf == NULL) debugmessage("Could not create
netbuf for UDP test<br>");
if
(buf != NULL)
{
data = "" bufsize);
if (data == NULL) debugmessage("Could not allocate
pointer to UDP test data in netbuf<br>");
if
(data != NULL)
{
while(1)
{
HAL_GPIO_WritePin(CONT6_GPIO_Port, CONT6_Pin,
GPIO_PIN_SET);
for (index = 0; index <bufsize; index++)
{
data[index] = index;
}
//
err = netconn_send(conn, buf);
err = netconn_sendto(conn, buf, IP_ADDR_BROADCAST,
5004);
if (err == ERR_USE)
HAL_GPIO_WritePin(CONT3_GPIO_Port, CONT3_Pin,
GPIO_PIN_SET);
if (err == ERR_MEM)
HAL_GPIO_WritePin(CONT4_GPIO_Port, CONT4_Pin,
GPIO_PIN_SET);
if (err != ERR_OK)
HAL_GPIO_WritePin(CONT5_GPIO_Port, CONT5_Pin,
GPIO_PIN_SET);
HAL_GPIO_WritePin(CONT6_GPIO_Port, CONT6_Pin,
GPIO_PIN_RESET);
osDelay(4);
}
netbuf_delete(buf);
}
}
//
osDelay(4);
}
}
}
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