Hi fellows I’m working with a ek-tm4c1294l board, with the enet_lwip example. I’m having problems showing some data when I load a webpage. To achieve this I’m using HTTP requests in javascript, and the webpage is programmed in HTML.
I’m trying to show an integer variable which I get from the board. The strange fact is that sometimes I see the variable and sometimes not, in a kind of random way , as you can see in the following images, respectively:
The javascript function used is:
<script>
//function executed when the webpage is load
function Historial(){
var req = false;
function nReturned()
{
if(req.readyState == 4)
{
if(req.status == 200)
{
n = req.responseText;
document.getElementById("prueba").innerHTML = "<div>" + n + "</div>";
}
}
}
if(window.XMLHttpRequest)
{
req = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req)
{
req.open("GET", "/hist_def?id=" + Math.random(), true);
req.onreadystatechange = nReturned;
req.send(null);
}
}
</script>
And the C code who executes the URL of the request:
//c code
if(ustrncmp(pcName, "/hist_def", 8) == 0){
def++;
static char pcBuf[6];
h_inicial(pcBuf);
psFile->data = pcBuf;
psFile->len = strlen(pcBuf);
psFile->index = psFile->len;
psFile->pextension = NULL;
return(psFile);
}
// h_inicial() function
void h_inicial(char *inic_data){
while(pd>pe){
n++;
pe++;
}
pe=med;
sprintf(inic_data, "%d%", n);
}
<!—html code -->
<p id="prueba"></p>
The h_inicial() function returns the difference between two pointers pd and pe in an integer variable (n) .
I do the HTTP request following the example of the enet_lwip, and enet_io code. So If anyone could advice me in anyway please do it!
Thanks in advanced, regards!
Matias Kormos