Multiple indipendent task

clf maris

Other Parts Discussed in Thread: CC3200

I'm trying to create an application with multiple tasks.
I try to explain my aim using only two task, for semplicity.

I want a first task to connect the CC3200 to my wlan network
and periodically checks if there is connection (so it has highest priority)

than there is a second task (even more than one) which collect information from sensors,
for example it collect temperature measurement.

The tasks are independent and doesn't communicate each other.

I did it this way:

in main function I have all initializations (variables, sensors, terminal)
and then I have:

osi_TaskCreate(ConnectionTask, (signed char*)"ConnectionTask", \
                                2048, NULL, \
                                2, NULL );


osi_TaskCreate(TemperatureTask, (signed char*)"TASK1",\
                                    1024, NULL,
                                1, NULL );

ConnectionTask starts a cycle every 3 minutes to check the connection
TemperatureTask starts a cycle every minute to save collected data.

Do I need a semaphore to do this?

over 9 years ago

0 Aashish Bhanawat over 9 years ago

TI__Genius 16085 points

Hi Maris,

No need of semaphore, If both are independent and doesn't need any communication between them.

Re

0 clf maris over 9 years ago in reply to Aashish Bhanawat

Intellectual 420 points

Thank you for your answer Aashish.

I'm trying to understand my problem.

I think that the first task enters in an infinite loop and never stops since the other task has lower priority.

I though, wrongly, that a semaphore was needed.

0 Hnz over 9 years ago in reply to clf maris

Guru 39650 points

Hi,

Use osi_Sleep(). This is easiest way for you.

Jan

0 clf maris over 9 years ago in reply to Hnz

Intellectual 420 points

I use it in my tasks

I did this way

void main()
{
    BoardInit();
    PinMuxConfig();

    PinConfigSet(PIN_58,PIN_STRENGTH_2MA|PIN_STRENGTH_4MA,PIN_TYPE_STD_PD);

    InitializeAppVariables();

    InitTerm();
    
    GPIO_IF_LedConfigure(LED1);
    GPIO_IF_LedOff(MCU_RED_LED_GPIO);

    I2C_IF_Open(I2C_MASTER_MODE_FST);

    TMP006DrvOpen();

    //ReadDeviceConfiguration();


    VStartSimpleLinkSpawnTask(SPAWN_TASK_PRIORITY);

    
    osi_TaskCreate(firstTask, (signed char*)"firstTask", \
                                2048, NULL, \
                                1, NULL );


    osi_TaskCreate(connectionTask, (signed char*)"connectionTask",\
        							1024, NULL,
									2, NULL );

    osi_TaskCreate(mdnsTask, (signed char*)"mdnsTask",\
           							1024, NULL,
   									1, NULL );

    osi_start();

    while (1)
    {

    }

}

and my tasks are:

static void firstTask(void *pvParameters)
{

   float fCurrentTemp;

   for (;;)
   {
	   TMP006DrvGetTemp(&fCurrentTemp);
	   UART_PRINT("il valore è %f \n\r", fCurrentTemp);
	   osi_Sleep(10000);
   }
}

//****************************************************************************

static void connectionTask(void *pvParameters)
{
   ReadDeviceConfiguration();
   ConnectToNetwork();
}

//****************************************************************************

static void mdnsTask(void *pvParameters)
{
    int sleep = FIRST_INTERVAL;
    long mdnsRetVal;

    for (;;)
	{

	   do
	   {
		   mdnsRetVal = mDNS_advertise();
		   osi_Sleep(sleep);
		   sleep = ADVERTISING_INTERVAL;
	   } while(mdnsRetVal < 0); // i use this cycle because first mdns registration fails

	}
}

0 clf maris over 9 years ago in reply to clf maris

Intellectual 420 points

If I remove ConnectToNetwork and mDNS_advertise and I substitute them
with a simple task that does something not related to nwp it works.

What can be the problem with nwp operations?

EDIT: I found that the problem is the mDNS_advertise function; it always fails the first advertising

0 Aashish Bhanawat over 9 years ago in reply to clf maris

TI__Genius 16085 points

Hi Maris,

Before starting mDNS, device need to acquire the IP. Please make sure before calling mDNS_advertise() device is connected to AP and acquired the IP. Please refer mDNS example code fron SDK.

Regards,
Aashish

0 clf maris over 9 years ago in reply to Aashish Bhanawat

Intellectual 420 points

Hi Aashish,

I'm able to do mDNS registration, but only one time.

I would like to repeat it periodically, but I'm not able to do this.

The code seems to be ok.

0 clf maris over 9 years ago in reply to clf maris

Intellectual 420 points

I don't know why but after formatting and reinstalling service pack it work without any change in my code.

0 Aashish Bhanawat over 9 years ago in reply to clf maris

TI__Genius 16085 points

Hi Maris,

As issue is resolve we are closing this thread, for follow up queries please open a new thread and add a link to this one for reference.

Regards,
Aashish

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Multiple indipendent task