Hi Noam,
thanks again for your help.
Which LwIP version do you have? The function 'tcp_new_ip_type' is just
another way to allocate a new tcp pcb (I use version 1.4.1). I don't
think that is the cause of the problem, though.
However, I did try it again with your init function and the program has
the same behavioras before.
In my 'main.cpp' I have a while loop that gets data from the serial port
and then calls 'tcpServer_send' (I want to send that data over
ethernet). This function call is not in the same context as the LwIP
callbacks, so I guess that's why it doesn't work. How do you send data
from outside this context?
Best regards,
Julio
Am 31.10.2016 um 12:26 schrieb Noam Weissman:
Hi,
As a continuation to my earlier mail…
Where do you call tcpServer_send ??
In tcpecho_raw_init function you call function tcp_new_ip_type I am
not familier with this function ?
My init function looks like this:
struct tcp_pcb *Listening_pcb; // is define static global
void TcpTermInit(u16 TcpTermPort)
{
struct tcp_pcb *pcb;
err_t err;
pcb = tcp_new();
if(pcb != NULL)
{
// bind local IP with our port
err = tcp_bind(pcb, IP_ADDR_ANY, TcpTermPort);
if(err == ERR_OK)
{
// The tcp_listen() function returns a new connection control block, and
// the one passed as an argument to the function will be
deallocated. The
// reason for this behavior is that less memory is needed for a
connection
// that is listening, so tcp_listen() will reclaim the memory
needed for
// the original connection and allocate a new smaller memory
block for the
// listening connection.
Listening_pcb = tcp_listen(pcb);
// if we are here that mean that we did not use all available
connection
// and we are ready to treat another one.
tcp_setprio(Listening_pcb, TCP_PRIO_MIN);
tcp_accept(Listening_pcb, tcp_term_accept);
}
else
{
/* abort? output diagnostic? */
}
}
else
{
/* abort? output diagnostic? */
}
}
BR,
Noam.
*From:*lwip-users
[mailto:lwip-users-bounces+noam=silrd....@nongnu.org] *On Behalf Of
*Julio Cesar Aguilar Zerpa
*Sent:* Monday, October 31, 2016 11:00 AM
*To:* Mailing list for lwIP users
*Subject:* Re: [lwip-users] Tcp Server on Texas Instrument RM57
Hi Noam,
Thank you for helping me.
1. *First of all are you running with an OS or without?*
I am using the RM57 Microprocessor -> without OS
2. *Secondly do you understand that with RAW API you should not call
any LwIP if the call is not from within the LwIP own context?*
That is a very important point that I didn't know about! So, then
how should I send data? How do I initialize the pbuf pointer?
3. *As far as I see you are not copying the data into the new buffer.
How is the send itself? does the function **tcpecho_raw_send**copying
the data to the buffer?
*Yes, you are right. I noticed that. I then tried it with "TEST_DATA"
as global. Same problem (but at least the data was correct at
*tcpecho_raw_send*)
4. *The code is just partial so I cannot see the picture
* You can see the code if you have the examples. It's the
'tcpecho_raw'. I will attach it just in case you don't have it. I made
some minor modifications to check if there's a connection and also
added the function already described. (Again: the 'echo' part works ->
received data is being sent back correctly, *but* sending data that
wasn't received is not working)
5. *Secondly check if tcp_write uses the copy mode into an internal
buffer or use a reference to data.
* Yes, it uses the copy mode.
I also tried to send the data using the 'tcp_write' function directly
instead of calling *tcpecho_raw_send* and it returned error -11 (no
connection) but was receiving and sending data over the callbacks.
It appears your second statement is one of the reason my program is
not working. I don't have any current docu, do you have any?
How do I send data? Is there another example that receives data over
callbacks and is able to send data created on its own memory space?
Best regards,
Julio*
*
Am 29.10.2016 um 02:04 schrieb Noam Weissman:
Hi,
First of all are you running with an OS or without ?
Secondly do you understand that with RAW API you should not call
any LwIP
if the call is not from within the LwIP own context ?
As far as I see you are not copying the data into the new buffer.
How is the send itself ?
does the function tcpecho_raw_sendcopying the data to the buffer ?
RAW API means that everything you do is in the same context. If
you block on the function
tcpecho_raw_send and/or do something that takes too much time yes
the data will not properly
handled.
The code is just partial so I cannot see the picture.
I would start with setting your uint8 data[] = "TEST_DATA";to
static OUTSIDE of the function. This way
it will not change when you exit from the function.
Secondly check if tcp_write uses the copy mode into an internal
buffer or use a reference to data.
BR,
Noam.
------------------------------------------------------------------------
*From:*lwip-users <lwip-users-bounces+noam=silrd....@nongnu.org>
<mailto:lwip-users-bounces+noam=silrd....@nongnu.org> on behalf of
Julio Cesar Aguilar Zerpa <agui...@goetting.de>
<mailto:agui...@goetting.de>
*Sent:* Friday, October 28, 2016 4:56 PM
*To:* lwip-users@nongnu.org <mailto:lwip-users@nongnu.org>
*Subject:* [lwip-users] Tcp Server on Texas Instrument RM57
Hi there,
I am trying to use the LwIP library (1.4.1) to create a simple tcp
server on a Texas Instrument RM57.
So far, I could make the "tcpecho_raw" example to work using an
static ip.
I also added the following function (which did not work), to be
able to
send data that wasn't an echo:
void tcpServer_send()
{
uint8 data[] = "TEST_DATA";
struct pbuf* buffer = pbuf_alloc(PBUF_RAW, sizeof(data),
PBUF_POOL);
if (buffer)
{
sciDisplayText(sciREG1, txt_new_line, sizeof(txt_new_line));
sciDisplayText(sciREG1, "buffer created", sizeof("buffer
created"));
buffer->tot_len = sizeof(data);
buffer->len = sizeof(data);
buffer->payload = data;
tcpecho_es->p = buffer;
tcpecho_raw_send(tcpecho_raw_pcb, tcpecho_es);
}
}
As you can see, the function prints a debug msg ("buffer created"). I
modified the function 'tcpecho_raw_send' to also print a debug msg
(the
data being sent).
When I run the program, I can see the msg "buffer created" every time
the function is called, but the msg from 'tcpecho_raw_send' comes
only
when I close the client! (And the msg is missing the acutal data,
btw).
NOTE: I want to build a server that receives some commands and
sends a
block of data (4KB) every 60 ms. I am using the raw API because I
don't
want to use blocking functions (from what I understood the netconn
API
uses blocking functions).
I would appreciate any help.
Best regards,
Julio Aguilar
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i.A. Julio Cesar Aguilar Zerpa
--
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_______________________________________________
lwip-users mailing list
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Mit freundlichen Grüßen
Götting KG
i.A. Julio Cesar Aguilar Zerpa
--
M.Sc. Julio Cesar Aguilar Zerpa
Forschung & Entwicklung
agui...@goetting.de
Tel. +49(0)-5136-8096-39
————————————————————
Götting KG
Celler Str. 5, D-31275 Lehrte/Röddensen
Geschäftsführer H.-H. Götting
HR A 31127 | Amtsgericht Hildesheim
Gerichtsstand Lehrte
USt.-Id. Nr. DE 115055039
USt.-Nr. 16-226-13403
Phone +49(0)-5136-8096-0
Fax +49(0)-5136-8096-80
i...@goetting.de | www.goetting.de
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