Need replace semaphore to event

Siarhei Belafost

Prodigy 200 points

Other Parts Discussed in Thread: SYSBIOS

Hello

i have test task where i = 0; i++ and

when i ==5 i need to start new task with "while(1)"

and when i==10 i need to break this "while"

with the help of semaphore, it's hard to get it

help me please use the "event"

I tried to understand, but I could not get

Please check the code and fix the problemm

#include <xdc/std.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Clock.h>
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/knl/Semaphore.h>

#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>

#include "Board.h"

#define TASKSTACKSIZE   768
//PIN_Handle pinHandle = NULL;

Task_Struct task0Struct, task1Struct, task2Struct;
Char task0Stack[TASKSTACKSIZE], task1Stack[TASKSTACKSIZE], task2Stack[TASKSTACKSIZE];
Task_Handle uartTask, vmTask, stopTask;
Semaphore_Struct sem0Struct, sem1Struct;
Semaphore_Handle startVmSem;
Semaphore_Handle stopVmSem;


Void uartFxn(UArg a0, UArg a1){
		uint32_t i = 0;
	    while(1){
	    	i++;
	    	System_flush();
	    	System_printf(" %d", i);
	    	if(i==5){
	    		Semaphore_post(startVmSem);
	    	}
	    	if(i==10){
	    		Semaphore_post(stopVmSem);
	    	}
			Task_sleep(1000000 / Clock_tickPeriod);
	    }
}

void vmFxn(void){
	uint32_t i=0;
	while(1){
		Semaphore_pend(startVmSem, BIOS_WAIT_FOREVER);
		while(1){
			if(1){
				i++;
				System_flush();
				System_printf(" <i=%d>", i);
			}
			else {
				Semaphore_pend(stopVmSem, BIOS_WAIT_FOREVER);
				break;
			}
		}
	}
}


/*
 *  ======== main ========
 */
int main(void)
{
    Task_Params taskParams;
    Semaphore_Params semParams;

    /* Call board init functions */
    Board_initGeneral();

    /* Construct BIOS objects */
    	Task_Params_init(&taskParams);
        taskParams.stackSize = TASKSTACKSIZE;
        taskParams.stack = &task0Stack;
        taskParams.priority = 2;
        taskParams.instance->name = "vmFxn";
        Task_construct(&task0Struct, (Task_FuncPtr)vmFxn, &taskParams, NULL);
        vmTask = Task_handle(&task0Struct);

        taskParams.stack = &task1Stack;
        taskParams.priority = 1;
        taskParams.instance->name = "uartFxn";
        Task_construct(&task1Struct, (Task_FuncPtr)uartFxn, &taskParams, NULL);
        uartTask = Task_handle(&task1Struct);


        Semaphore_Params_init(&semParams);
        semParams.mode = Semaphore_Mode_BINARY;
        Semaphore_construct(&sem0Struct, 0, &semParams);
        startVmSem = Semaphore_handle(&sem0Struct);

        semParams.mode = Semaphore_Mode_BINARY;
        Semaphore_construct(&sem1Struct, 0, &semParams);
        stopVmSem = Semaphore_handle(&sem1Struct);


    BIOS_start();

    return (0);
}

over 8 years ago

0 Gerardo Gomez Martinez over 8 years ago

TI__Expert 5825 points

Hi Siarhei,

We have an Events example you can use in order to help you develop this, it can be found under:
<tirtos_install_dir>\products\<bios>\packages\ti\sysbios\examples\generic\event

You can also find the API for Events by going to your resource explorer, expanding your TI-RTOS and clicking on Documentation Links, then under Kernel Documentation you will find the TI-RTOS Kernel Runtime APIs. You can find the Events section under:
ti->sysbios->knl->Event

Thanks,
Gerardo

0 Siarhei Belafost over 8 years ago in reply to Gerardo Gomez Martinez

Prodigy 200 points

That's great! But ur example just doesnt work.
When I run it - nothing happens...
I need help. Instead of links to guides.
Thanks.

0 Michel Solecki over 8 years ago

Mastermind 8415 points

How can you break your while loop if your condition is using a constant??

Line 47 in your code:

if(1) {

  ...

}
else {
  // this will never get executed
  ...

}

That means, it will never go to your else clause.

0 Siarhei Belafost over 8 years ago in reply to Michel Solecki

Prodigy 200 points

Thx but its not reply

0 Michel Solecki over 8 years ago in reply to Siarhei Belafost

Mastermind 8415 points

We are trying to help but it needs to be clear what you are asking for.

In your first statement, you say you want to start a new task when i==5, but in your code, you never actually start a new task, you only jump into an infinite while loop.
Then your statement says that you want to break out of the loop, but as I mentioned, you will never break with the logic that you have.
Then you ask to change to events, but I don't see how events are going to fix your logic.

If you do not know how events work, look at example code (as suggested previously). That's the best way to learn.

And it's not up to us to correct your problems either, we are here to help you, not serve you.

0 Gerardo Gomez Martinez over 8 years ago in reply to Siarhei Belafost

TI__Expert 5825 points

Hi Siarhei,

Have you tried rewriting your code by referencing the Events example I mentioned? What was the outcome?

Thanks,
Gerardo

0 Siarhei Belafost over 8 years ago in reply to Gerardo Gomez Martinez

Prodigy 200 points

yes, its ok ty.

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Need replace semaphore to event