Hi Vincent,
I changed the receiving process to be nonblocking, it wasn't like this in
the first place. The code below has the same entry point as your
"vHandler_HTTP(__pstNewConn);", it gets called when the connection is
already established.
My problem was the following: I needed to check for new data received via
Ethernet as well as new data from a Sendqueue in the same task. So
netconn_recv() could not be blocking. In another topic, Simon Goldschmitt
suggested to use lwIP 1.3.1 and to set "LWIP_SO_RCVTIMEO" to make
netconn_recv() nonblocking. Unfortunately this crashed my Sam7X all the
time.
So what I do now, is to peek into the receive mailbox and only if there is
data I start the netconn_recv() process. Probably horrible programming, but
it works for now.
Richard suggested to use semaphores on TCP events, that sounds much cleaner
and I will definitely try to do it that way. But then I would need a
FreeRTOS function like "WaitForMultipleObjects", since the Task needs to
wake up for either a TCP event semaphore OR a new element in my SendQueue.
The CommandInterpreter from Richards socket example (thanks !) works for my
Sam7X and I am in the process of rewriting it to have the same
functionality as the code below.
@Vincent: You said your webserver is able to have multiple connections,
could you give me a tip on that ? Do you have a small code example for
"multiconnection socket" part ?
Thank you very much,
Christoph
static void vProcessSpeedtest( struct netconn *pxNetCon )
{
struct netbuf *pxRxBuffer;
struct pbuf *dummybuffer;
unsigned char *pcRxString;
xTCP_TXBuff * TXPointer = 0;
unsigned short usLength;
while (1)
{
// Peek into the Receive mailbox
if ( pdTRUE ==
xQueuePeek((pxNetCon->recvmbox),&dummybuffer,0))
{
pxRxBuffer = netconn_recv( pxNetCon );
if( pxRxBuffer != NULL )
{
do
{
netbuf_data( pxRxBuffer, ( void * )
&pcRxString, &usLength );
//use the incoming data at this
point
} while ( netbuf_next(pxRxBuffer) >=0 );
netbuf_delete( pxRxBuffer );
}
else break;
}
// Check the Transmit Queue for Data and send it
if ( xQueueReceive( xTXPointerQueue, &TXPointer, 0 ))
{
netconn_write(pxNetCon, TXPointer->data,
TXPointer->length, NETCONN_NOFLAG);
vFreeTCPBuffer(TXPointer);
}
vTaskDelay( 1 / portTICK_RATE_MS );
}
netconn_close( pxNetCon );
}
>
> -------- Original-Nachricht --------
> Datum: Tue, 30 Aug 2011 03:28:07 +0000
> Von: vincent cui <[email protected]>
> An: Mailing list for lwIP users <[email protected]>
> Betreff: Re: [lwip-users] FreeRTOS / lwip multiple connections
>
>
> Hi Chistoph:
>
>
> The "lwIP Embedded Webserver Demo" is what I took as a starting point.
> I removed the webserver functionality, now I have a task that
>
> - checks for incoming data (nonblocking)
>
>
>
> - checks a Queue for outgoing data (nonblocking)
>
>
> - wait 1 ms (to prevent 100% cpu usage)
>
>
> - repeat :-)
>
>
>
> the LwIP webserver demo code is following, I
> don’t know how do you infer it is noblocking for incoming data
> and outgoing ….
>
> Where to wait 1 ms .
>
> void
> WebServer_Handler(void *pdata)
>
> {
>
> struct netconn *__pstConn,
> *__pstNewConn;
>
>
>
> __pstConn =
> netconn_new(NETCONN_TCP);
>
> netconn_bind(__pstConn, NULL,80);
>
> netconn_listen(__pstConn);
>
> for(;;)
>
>
> {
>
> __pstNewConn =
> netconn_accept(__pstConn);
>
>
> if(__pstNewConn != NULL)
>
>
>
> {
>
>
>
> vHandler_HTTP(__pstNewConn);
>
>
>
> while(netconn_delete(__pstNewConn) != ERR_OK)
>
>
> {
>
>
>
> vTaskDelay(10);
>
>
> }
>
> }
>
> }
>
> }
>
>
> Vincent Cui
> Sr.Firmware Engineer
> Mobile: +8613482482211
> Tel: +86 21 34612525x6104
> Fax: +86 21 34619770
> E-Mail: [email protected]
> Shanghai EnLogic Electric Technology Co., Ltd.
> Address: 1104-1106, Building A, No.391, Guiping Road, Xuhui District,
> Shanghai, 200233
> http://www.enlogic.com
>
>
> From: [email protected]
> [mailto:[email protected]] On Behalf
> Of Christoph Kronen
> Sent: 2011年8月29日 0:48
> To: [email protected]
> Subject: [lwip-users] FreeRTOS / lwip multiple connections
>
> Hi all,
>
> I am using FreeRTOS 7.0.1 on a Sam7X512 and upgraded the contributed
> port lwIP 1.3.0 to 1.3.2.
>
> The "lwIP Embedded Webserver Demo" is what I took as a starting point. I
> removed the webserver functionality, now I have a task that
>
> - checks for incoming data (nonblocking)
>
>
>
> - checks a Queue for outgoing data (nonblocking)
>
>
> - wait 1 ms (to prevent 100% cpu usage)
>
>
> - repeat :-)
>
>
>
>
> This works pretty well, I get around 1400 kbyte/s RX and TX.
> Now to my question: Is it possible/difficult/easy to transform this
> functionality to accept multiple connections on the same port ? At the
> moment I am using the netconn API, so I guess I have to switch to the
> Socket API ?
>
> I read through Richards thread on his "FreeRTOS/lwip Win32 simulator"
> project and it sounds as if it is quite difficult to have multiple
> connections in a multithreaded environment. Unfortunately I could not
> find other helpful topics or contributed examples.
>
> I am rather new to FreeRTOS and lwIP, so please excuse me if I am
> missing something obvious :-)
>
> Please give me some comments / suggestions / tips / pushes into the
> right direction.
>
> Thank you very much !
>
> Christoph
>
>
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