cc3200 http server example

haitham alzugheir

Other Parts Discussed in Thread: CC3200

Hi guys,

I want some explanation about this code from the HTTP server example on CC3200.Can anybody help me with it

void SimpleLinkHttpServerCallback(SlHttpServerEvent_t *pSlHttpServerEvent,
SlHttpServerResponse_t *pSlHttpServerResponse)
{
UINT8 strLenVal = 0;
switch (pSlHttpServerEvent->Event)
{
case SL_NETAPP_HTTPGETTOKENVALUE:
{
UINT8 status, *ptr;

ptr = pSlHttpServerResponse->ResponseData.token_value.data;
pSlHttpServerResponse->ResponseData.token_value.len = 0;
if(memcmp(pSlHttpServerEvent->EventData.httpTokenName.data, GET_token,
strlen((const char *)GET_token)) == 0)
{
status = GPIO_IF_LedStatus(MCU_RED_LED_GPIO);
strLenVal = strlen(LED1_STRING);
memcpy(ptr, LED1_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
if(status & 0x01)
{
strLenVal = strlen(LED_ON_STRING);
memcpy(ptr, LED_ON_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
}
else
{
strLenVal = strlen(LED_OFF_STRING);
memcpy(ptr, LED_OFF_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
}
status = GPIO_IF_LedStatus(MCU_GREEN_LED_GPIO);
strLenVal = strlen(LED2_STRING);
memcpy(ptr, LED2_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
if(status & 0x01)
{
strLenVal = strlen(LED_ON_STRING);
memcpy(ptr, LED_ON_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
}
else
{
strLenVal = strlen(LED_OFF_STRING);
memcpy(ptr, LED_OFF_STRING, strLenVal);
ptr += strLenVal;
pSlHttpServerResponse->ResponseData.token_value.len += strLenVal;
}
*ptr = '\0';
}

}
break;

case SL_NETAPP_HTTPPOSTTOKENVALUE:
{
UINT8 led;
UINT8 *ptr = pSlHttpServerEvent->EventData.httpPostData.token_name.data;

if(memcmp(ptr, POST_token, strlen((const char *)POST_token)) == 0)
{
ptr = pSlHttpServerEvent->EventData.httpPostData.token_value.data;
strLenVal = strlen(LED_STRING);
if(memcmp(ptr, LED_STRING, strLenVal) != 0)
break;
ptr += strLenVal;
led = *ptr;
strLenVal = strlen(LED_ON_STRING);
ptr += strLenVal;
if(led == '1')
{
if(memcmp(ptr, LED_ON_STRING, strLenVal) == 0)
{
GPIO_IF_LedOn(MCU_RED_LED_GPIO);
}
else
{
GPIO_IF_LedOff(MCU_RED_LED_GPIO);
}
}
else if(led == '2')
{
if(memcmp(ptr, LED_ON_STRING, strLenVal) == 0)
{
GPIO_IF_LedOn(MCU_GREEN_LED_GPIO);
}
else
{
GPIO_IF_LedOff(MCU_GREEN_LED_GPIO);
}
}

}
}
break;
default:
break;
}
}

over 9 years ago

0 Markel Robregado over 9 years ago

Guru 85695 points

Hi Haitham,

That is event handlers for GET and POST Tokens.

You can get more understanding on how that works by reading the HTTP Server part from the document below.

http://www.ti.com/lit/ug/swru368/swru368.pdf

- kel

0 haitham alzugheir over 9 years ago in reply to Markel Robregado

Intellectual 775 points

Hi Markel,

I have read this document however there is in the code POST_token[] = "__SL_P_ULD";, GET_token[] = "__SL_G_ULD" that I didn't find in the document swru368.pdf. what are the purposes of these tokens

0 Markel Robregado over 9 years ago in reply to haitham alzugheir

Guru 85695 points

haitham alzugheir said:
there is in the code POST_token[] = "__SL_P_ULD";, GET_token[] = "__SL_G_ULD" that I didn't find in the document swru368.pdf. what are the purposes of these tokens

Yes, those are not in the document. Because those are User-Defined Tokens. User-Defined Tokens are mentioned in the swru368.pdf doc. Read again.

Actually, it will benefit you a lot to read the entire document and not just the http server part.

- kel

0 Alon Srednizki over 9 years ago in reply to Markel Robregado

TI__Mastermind 18455 points

Hi Haitham,,

Do you need any more information on top of what Kel has answered?
All of Kel's posts in this matter are correct and to the point.

Thanks,
Alon

0 haitham alzugheir over 9 years ago in reply to Alon Srednizki

Intellectual 775 points

Hi Alon,

yes I need more information about the code of the HTTP server actually it is not sufficient the document that markel suggested.I need more detail and easy understanding tutorial.

0 Alon Srednizki over 9 years ago in reply to haitham alzugheir

TI__Mastermind 18455 points

Hi Haitham,

Unfortunately, we don't have any more information. We will work to update our programmers guide and maybe add some tutorial (good idea).

In the mean while I suggest that you will review our HTTP server example code with a debugger, place some break points in SimpleLinkHttpServerCallback() function and track the way it works.

In addition, we are conducting training sessions all over the world and on the web, please check the following link for a location and date that are good for you: http://focus.ti.com/general/docs/trainingsearchresults.tsp?sectionId=616&topic=8&subTopic=-1&eventTypeId=-1&region=-1&dateRange=-1&fromDate=09%2F15%2F2013&toDate=12%2F31%2F2014&Input3=Search&DCMP=training&HQS=training-wireless

Thanks,
Alon

0 haitham alzugheir over 9 years ago in reply to Alon Srednizki

Intellectual 775 points

Hi alon,

The link is not working I tried several times.

0 Alon Srednizki over 9 years ago in reply to haitham alzugheir

TI__Mastermind 18455 points

Hi Haitham,

Please try the following link: http://www.ti.com/ww/en/simplelink_embedded_wi-fi/support_community.html

Then choose the "Get Trained" link.

Thanks,
Alon

0 Markel Robregado over 9 years ago in reply to haitham alzugheir

Guru 85695 points

Hi Haitham,

I have studied the httpserver and have come to a good understanding how it works. This three below are important to learning httpserver.

1. httpserver code
2. led_demo.html
3. swru368.pdf

To understand the led_demo.html, you need to have some basic knowledge about html. You can find html tutorials in the internet that you can learn from.

Before, I was only looking at httpserver code and led_demo.html and got stuck at the part how they exchange data. The swru368.pdf gave me all the answers that I needed and it became more clearer to me how httpserver code and led_demo.html exchange data, and that is through GET and POST Token.

- kel

0 haitham alzugheir over 9 years ago in reply to Markel Robregado

Intellectual 775 points

Hi markel,
I went through these files ten times, the problem that I dont have a basic knowledge about programming HTML page neither understanding the part of the code where exchange data is happened.I only want to send one value(number) from HTML page(Browser) to the server which is in this case the CC3200.I am wondering if you can help me more in this issue.
cheers

0 Markel Robregado over 9 years ago in reply to haitham alzugheir

Guru 85695 points

haitham alzugheir said:
the problem that I dont have a basic knowledge about programming HTML page neither understanding the part of the code where exchange data is happened

You need to have basic knowledge of HTML and C Programming to understand both. There are lots of tutorials in the internet that can help you.

I have background in making web pages before so I have a bit of understanding of HTML. HTML is not that difficult to understand.

- kel

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cc3200 http server example