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 = netbuf_alloc(buf, 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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