joep wolters

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11 years, 3 months ago.

how to set priority

could anyone give a simple example how to set the priority of a threat?

thanks in advance

Question relating to:

Last updated: 30 Apr 2020
ISR, mail, Memory Pool, mutex, Queue, rtos, semaphore, Signals, thread, timer

1 Answer

Robert Spilleboudt
11 years, 3 months ago.

Within a test project like rtos_basic, look at:
-the class Thread :you find the function set_priority
-in rtx/cmsi_os.h you find the definition of priority (line 154)
I hope this can help you
Robert

Accepted Answer

thank you for the fast respons, I will look into it.

update: I got it working using the rtos_basic program with some code from this program: https://mbed.org/users/JimCarver/code/KL46_eCompass/file/ba1dbfb683fb/main.cpp

setting and printing priority in RTOS

#include "mbed.h"
#include "rtos.h"
 
DigitalOut led1(LED1);
DigitalOut led2(LED2);
Serial pc(USBTX, USBRX); // tx, rx

Thread *(test);
 
void led2_thread(void const *args) {
    while (true) {
        led2 = !led2;        
        Thread::wait(1000);       
    }
}

int main() {
    Thread thread(led2_thread);
    test = &thread;
    test->set_priority(osPriorityHigh);
    pc.printf("%i\n\r",test->get_priority());
        
    while (true) {
        led1 = !led1;
        Thread::wait(500);        
    }
}

The program sends a 2 to the serial program on my computer confirming that the priority is set high.

posted by joep wolters 07 Aug 2014