- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Original question:
Tool/software: Code Composer Studio
Dear All,
I am trying to work with tm4c1294ncpdt ethernet example enet_io. This whole example is working find. Sending data from web browser to uart is working fine.
Next I want to send data from tiva and display it on the webpage. Are there any example on that or any reference on how it can be done. What modification should I do in webpage and enet_io(Tiva code) to achieve this. Please help me if any one has any idea on how to do so.
Thanks
Aman.
Hi,
I'm not clear with your question about displaying on the webpage. The enet_io and enet_lwip are the web server examples. If you run the enet_io, you should be able to see the web page displayed on your browser hosted by the the tiva device. Isn't this what you are looking for. The example will display the below wepage if you type the Tiva's (the webserver) IP address on your broswer's URL field. The example will display on your terminal window on what IP address the Tiva (the web server) device acquires from the DHCP server. In my case, my Tiva acquires 10.219.14.134 as the IP address.
Hi Aman,
I think I understand what you are looking for. While I'm not an expert at all, I will point you to some code for you to reference and hopefully you get some idea to how to approach this. What you can reference is actually part of the enet_io example in my opinion. If you look at the I/O Control Demo2 (SSI/CGI) you may have already played with the animation speed. See below. You can type a new speed to change the LED blinking rate under the 'New' column. Once the new parameter is entered, the web server will update the new value under the 'Current' column. I will suppose this to be very similar to what you are looking for. For example, if you type a string in the field for Display this text over the UART: The string is sent to the web server. The web server will process this string (i.e. you type AT). The 'AT' string will then be sent to your ESP. When you ESP returns the 'OK' response or whatever response you will just use the same method the new animation speed rate is being sent by the web server to the browser.
Below is the description for IO Control Demo 2:
//! ``IO Control Demo 2'' uses standard HTML forms to pass parameters to CGI
//! (Common Gateway Interface) handlers running on the board. These handlers
//! process the form data and control the animation and LED as requested before
//! sending a response page (in this case, the original form) back to the
//! browser. The application registers the names and handlers for each of its
//! CGIs with the HTTPD server during initialization and the server calls
//! these handlers after parsing URL parameters each time one of the CGI URLs
//! is requested.
//!
//! Information on the state of the various controls in the second demo is
//! inserted into the served HTML using SSI (Server Side Include) tags which
//! are parsed by the HTTPD server in the application. As with the CGI
//! handlers, the application registers its list of SSI tags and a handler
//! function with the web server during initialization and this handler is
//! called whenever any registered tag is found in a .shtml, .ssi, .shtm or
//! .xml file being served to the browser.
//!
The handler that is talked about in the above description can be found in the enet_io.c. Please look at the ControlCGIHandler() and the SetTextCGIHandler() handlers.
Hopefully this is enough for you to start. If you get it to work, would you please share with the community so others looking for the same solution will also benefit.
Dear Charls,
Thanks for your reply.
I did it using the SSI handler. Here is modification in the code.
1) Replace the settxt.cgi table in "io_cgi.ssi" file. here is the html code.
<table align="center" border="1" cellpadding="2" cellspacing="2" width="80%">
<tbody>
<tr>
<td align="left" valign="top">
<form method="get" action="settxt.cgi" name="settxt">
<table border="0" cellpadding="2" cellspacing="2" width="100%">
<tbody>
<tr align="left">
<td valign="top">
<b>Display this text over the UART:<br></b>
<input maxlength="40" size="40" name="DispText">
<input name="Display" value="Send Text" type="submit">
</td>
<td valign="top" align="center">
<b>Received Text From UART:<br></b>
<table border = "1" width = "500" height = "35" align="right">
<tr>
<td><!--#UARTtxt--></td>
</tr>
</table>
</td>
</tr>
</tbody>
</table>
</form>
</td>
</tr>
</tbody>
</table>
The new page looks like this,
run command in the code directory to generate "io_fsdata.h" after change in .ssi file.
makefsfile -i fs -o io_fsdata.h -r -h -q
2) In "enet_io.c" file add the SSI tag name to *g_pcConfigSSITags[]. And also define SSI_UART_REPLY
#define SSI_UART_REPLY 3
static const char *g_pcConfigSSITags[] =
{
"LEDtxt", // SSI_INDEX_LEDSTATE
"FormVars", // SSI_INDEX_FORMVARS
"speed", // SSI_INDEX_SPEED
"UARTtxt" // SSI_UART_REPLY
};3) In the same file add in SSIHandler function add and iIndex case.
case SSI_UART_REPLY:
usnprintf(pcInsert, iInsertLen, RxBuf);
break;My Rxbuf[] array contains the reply for the uart devices. This will send the data to webpage every time you send a command from Send Text.
