Flags - newbie questions

mbedded wrote on Thursday, April 13, 2017:

A couple of newbie questions

What is the best way to communicate between tasks for the following:

Multiple tasks can send a flag to to Task_X and when done in Task_X, Task_X will reset the flag.
I have normally done this with a global variable, and any task can set this var to NOT Zero and when Task_X is done, Task_X will set the var to zero.
Reading the manual does seem a bit confusing as the are multiple options for this

I can’t seem to locate any definition guide, what does the various prefixes mean, ie xSomething, vSomething etc

I’m using this on an Arduino for now and all tasks have the same priority, so essentially a round robin scheduler.

Thanks
K

rtel wrote on Thursday, April 13, 2017:

  1. What is the best way to communicate between tasks for the following:

Multiple tasks can send a flag to to Task_X and when done in Task_X,
Task_X will reset the flag.
I have normally done this with a global variable, and any task can set
this var to NOT Zero and when Task_X is done, Task_X will set the var to
zero.
Reading the manual does seem a bit confusing as the are multiple options
for this

Have a look at event groups. They allow you to set and clear bits in
thread safe way:

http://www.freertos.org/FreeRTOS-Event-Groups.html

  1. I can’t seem to locate any definition guide, what does the various
    prefixes mean, ie xSomething, vSomething etc

http://www.freertos.org/FreeRTOS-Coding-Standard-and-Style-Guide.html

mbedded wrote on Thursday, April 13, 2017:

Thanks a bunch
K