TM4C1294KCPDT: Trouble with loading and reading web page & its content from SD card

Hi,

  There is not enough information to pinpoint the cause of the problem. I will suggest you use wireshark to examine the traffic on the Ethernet. That will help you debug the problem. Is there any reason why you want to store your data on the SD card rather than the on-chip memory. I suppose you use SD card with SPI interface, correct? Reading the html and the jpeg image data serially from SPI certainly is much slower than reading from the on-chip memory. I'm not surprised some bottleneck is reached from time to time. What SPI frequency are you operating with? What happens if you increase the SPI clock frequency?

Hi Charles,

Is there any reason why you want to store your data on the SD card rather than the on-chip memory.

--> Because in future application, web server (i.e. html pages/ javascript files/ image files, etc) size is more which may cause memory issue in case of Flash memory.

I suppose you use SD card with SPI interface, correct?

--> Yes. 

What SPI frequency are you operating with? What happens if you increase the SPI clock frequency?

--> I tried with 400KB, 1MHz, 2MHz freq. but for all result is same.

I tried to examine using wireshark: below are the results:

case-1: 

error: Uncaught SyntaxError: Unexpected string (index):1542

when i checked on given line in 'index.html' file it was something like this:  document.getElementById(cityName).style.displayt" tabindex="10">Enable

But actual line is like this: document.getElementById(cityName).style.display = "block";

case-2:

error: Uncaught TypeError: Cannot set property 'value' of null Pscripts.js:139 

when i checked on given line in 'jscript.js' file it was like this: document.getElementById("tSDCFile").value = spData[index++];

and the value at the time of data load is null in this variable 'spData[index++]'.

case-3:

error: Uncaught SyntaxError: Invalid or unexpected token Pscripts.js:28

when i checked on given line in 'jscript.js' file it was like this: req.open("GET", "/setnet_data.html?" + document.getElementById("NWd port 2

actual line is like: req.open("GET", "/setnet_data.html?" + document.getElementById("NW_Mode").value + "?" 

So everytime it gives some different error. In wireshark i checked no. of data bytes received are same as expected data bytes.

Hi,

  The TM4C129 SPI can operate up to 60Mhz. I wonder if that will help as you only configure the SPI at at much lower frequency (e.g. 1Mhz). With that said, I have no idea and no experience on those errors you are seeing on the client side (the browser side). Can you tell from the wireshark if the server (the MCU) is correctly sending the data? You said the no. of data bytes received are same as expected data bytes. I suppose the server is operating correctly. Is that a correct understanding? If this is the case, it is the client side with problem? You will need to debug the client side and do some searches for the meaning for these errors as I really don't have ideas for they are and unable to help although I wish I could.