WORKING: DE2-115 Simple Socket Server

Great work on converting the example. Can you please post it up so I can update this thread.

In regards to your question re external access and IPs. I imagine you have to use features of your router to enable external access. I'm not knowledgable here at all so i suggest you google abouthome webserving. But I suppose you could use a port forward on your router. So your IP given to you by your ISP would be the IP and then the port your design uses would go with that. So you set your router to forward anything on that port to your boards local address. I have no idea if that would work, perhaps being a webpage you may not be able to select port. Again I obviously have no idea, sorry.

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Hello, I managed to run the web server example and it works! However, I need to ask you if there is any way that I can send from FPGA to the webpage. In fact, using the webpage, I can write on the LCD, or light the leds ... What i need is the other way around, from fpga to the webpage..

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Congratulations on getting the Web Server running! That's a BIG step in the right direction.

I presume when you ask about sending data from the FPGA to the Web page that you are talking about dynamic data, or perhaps local variables such as IP address, etc. Sending HTML pages is nothing more than sending text, it just includes HTML code as part of the text string.

The trick is inserting dynamic (variable) data into the text stream on-the-fly. I'm using the C programming sprintf() function to replace format "wildcards" in a text string with program variables. If you're not familiar with it, sprintf() is just like printf() except that instead of printing to a screen or terminal, it prints to a buffer.

To demonstrate this, include the attached ip_config.c and ip_config.h files into your webserver project, and add the following code segment (between the 'Fred's') to http.c http_find_file() function:

/* Try to open the file */

printf("\nFetching file: %s.\n\n", filename );

/***** Added by Fred *****/

if (!strcmp(IP_CONFIG_FILE,conn->uri))

{

Get_IP_Config(sendbuff); // Call routine to update IP and Host information in HTML format

send(conn->fd,(void*)sendbuff,strlen(sendbuff),0); // Send Status XML page

conn->state = RESET; // Then reset the connection

return -1; // and bail out fo this process

}

/***** End Fred *****/

conn->file_handle = fopen(filename, "r");

You will also need to include ip_config.h in your http.c file.

The way this works is by hijacking the http.c http_find_file() function to look for 'ip.html' after the IP address before it tries to find any of the files in the ro_zipfs.zip that are hard-coded and cannot be changed on-the-fly.

You may need to change some of the variable names in the attached files to match your BSP, but it should work. (I'll be eagerly waiting to hear.)

(please note that i am not an experienced "c" programmer, so there may be more elegant ways of doing this. this will get you started, then you can experiment from there.)

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And another thing is that the IP address assigned to the board and used to control the board remotely is local and I can only access it if I am within the domain of my router. What are my options if I want someone outside my router to have access to the board other than getting a real IP?

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AsValdr is on the right track. Most routers have a default IP Address of 192.168.1.1 that will call up a web page in your browser for setting the configuration. You want to configure http port forwarding for the MAC address of your system. You can also assign FTP and telnet to your system this way. Each requires a separate port-forwarding assignment. Check your router documentation for the specifics. I have a couple systems set up that way and they work great.

Hello, thank you for your fast reply...

I'm trying to learn more about port forwarding and concerning the code that you gave me, what is sendbuff.. It is generating an error during compilation! I am new to C programming so I would really appreciate your help..

Thank you!

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I'm trying to learn more about port forwarding and concerning the code that you gave me, what is sendbuff.. It is generating an error during compilation! I am new to C programming so I would really appreciate your help..

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'sendbuff' is a variable that needs to be declared within the http.c file - something I forgot to mention in my description. Insert this code segment char sendbuff[768]; just below the two existing variable declarations in the http_find_file() function so that it looks like this:

int http_find_file(http_conn* conn)

{

printf( "I'm at http_find_file...\n\n" );

alt_u8 filename[256];

int ret_code = 0;

char sendbuff[768];

What you are doing here is reserving 768 bytes of memory that becomes the buffer that sprintf() puts the HTML formatted text string into. We use sprintf() as a convenient way to pick up the variables we want to include in the HTML text. Then the send() function pushes the string out through the socket connection to the requesting HTTP client, as in the following line:

send(conn->fd,(void*)sendbuff,strlen(sendbuff),0); // send ip config html page

The conn->fd is the socket connection, sendbuff is our buffer which now contains the HTML text string, strlen(sendbuff) returns the size of the string in the buffer so send() knows when to quit, and 0 is the offset from the beginning of the buffer where we begin sending.

There's nothing magical about this number 768, I just kept increasing the buffer size until it was big enough to hold my HTML code. If you want to send more HTML code than fits in this buffer, just increase its size.

I have only been studying C programming for about three months, so you are not far behind. It's terribly confusing at first, but it gradually falls into place. Trying to figure out existing code that you know works is a good way to reinforce your leaning.

Hello,

I am using NIOS II 10.0 IDE. When I perform some changes to the C code, it compiles and generates no error. But the problem is that when I try to run the webserver, the changes are not observed as if the program is running according to the previous code without the changes. I tried to use Nios II 10.0 Software Build Tools for Eclipse but it is generating errors because of the "include" files ("unresolved inclusion"). Any help please?!

Thank you!

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Hello,

I am using NIOS II 10.0 IDE. When I perform some changes to the C code, it compiles and generates no error. But the problem is that when I try to run the webserver, the changes are not observed as if the program is running according to the previous code without the changes. I tried to use Nios II 10.0 Software Build Tools for Eclipse but it is generating errors because of the "include" files ("unresolved inclusion"). Any help please?!

Thank you!

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It sounds a bit silly, but try creating a new project and copy and paste the error free code into it. Generally when I find something is trying to run older versions of code, this fixes it.

Well, I tried to create a new project! And the result is that I have errors, for example:

(SEVERE) generate: java.lang.IllegalStateException: java.lang.IllegalStateException: java.lang.NumberFormatException: empty String

make[1]: *** [system_description/../obj/system.h-t] Error 1

make: *** [system_project] Error 2

or:

5 [main] ? (428) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA00000, reserve_size 847872, allocsize 851968, page_const 4096

3 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: C:/altera/10.0/nios2eds/components/altera_hal/build/system_rules.mk:106: fork: Resource temporarily unavailable

/bin/sh: /cygdrive/c/altera/10.0/nios2eds/components/altera_hal: is a directory

10 [main] ? (2716) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

15839448 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

7 [main] ? (3300) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

19049540 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

6 [main] ? (3988) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

24311990 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

6 [main] ? (428) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

27505975 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

Creating generated.sh...

6 [main] ? (592) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

30345606 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

6 [main] ? (3032) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

32702017 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

Creating generated.x...

6 [main] ? (3872) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

37521586 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

6 [main] ? (2008) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

42000515 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: makefile:73: fork: Resource temporarily unavailable

7 [main] ? (2292) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

44203642 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: makefile:73: fork: Resource temporarily unavailable

6 [main] ? (3216) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA20000, reserve_size 978944, allocsize 983040, page_const 4096

46395488 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: makefile:73: fork: Resource temporarily unavailable

7 [main] ? (3800) c:\altera\10.0\quartus\bin\cygwin\bin\make.exe: *** fatal error - couldn't allocate heap, Win32 error 487, base 0x930000, top 0xA40000, reserve_size 1110016, allocsize 1114112, page_const 4096

52057925 [main] make 2992 fork: child -1 - died waiting for longjmp before initialization, retry 0, exit code 0x100, errno 11

make: vfork: Resource temporarily unavailable

Build completed in 253.497 seconds

What can i do to solve these? Any help please!!! I have read many threads with the following problem but there is no solution!

Thank you!

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Thanks!

Now the telnet server works. I am using a cross over cable and set the ip address, the subnet mask, and the gateway in windows manually. For the subnet mask and gateway, I used the values specified in the file simple_socket_server.h.

I also had to turn off enable_dhcp_client as described in the file that you uploaded.

So it was, as you said, a connection problem on the cable/computer side.

The simple socket server is running on both evaluation boards, DE2 and DE4.

Now I can start changing the socket server task to transfer data.

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Dear David,

I met the same problem,as follows:# ###################################

IP address of et1 : 192.168.10.234

Created "Inet main" task (Prio: 2)

Created "clock tick" task (Prio: 3)

DHCP timed out, going back to default IP address(es)

Simple Socket Server starting up

[sss_task] Simple Socket Server listening on port 30

Created "simple socket server" task (Prio: 4)# #####################################

You said it's connection problem on the cable/computer side,can you tell me how to solve this problem.

Looking forward to your reply and english isn't my native language, so I am sorry for some unclear sentence.

I used a cross-over cable and set the computer's IP address to 192.168.10.235, and the subnet mask and the gateway to the same value as the socket server.

Then, if you ping the Board's IP address 192.168.10.234, it should be successful.

Where do you have troubles?