Pedro Serra

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

11 years, 4 months ago.

[RTOS] - Conditional flow between threads

Good morning,

I'm starting to work with the mbed RTOS but I'm not being very fortunate. I'm currently trying to implement the program below: if a user presses a key different from "1", then a led will be lit; if the pressed key is "1", then the led has to be off. I'm not able to enter and exit the tasks as I was hopping. Can anyone help?

Conditional RTOS

#include "mbed.h"
#include "rtos.h"

Serial pc(USBTX,USBRX);
DigitalOut led1(LED1);
Semaphore hold(1);
char data=' ';
int i=10;

void ledon(void const *args)
{
    pc.printf("LED on.\n");
    led1=1;

}

void ledoff(void const *args)
{
    hold.wait();
    for (i=10; i<1; i--) {
        pc.printf("LED off in: %i\n", i);
        Thread::wait(1000);
    }
    led1=0;
    Thread::wait(500);
    hold.release();
}


int main()
{
    Thread ledup(ledon);
    Thread leddown(ledoff);

    while(true) {
        
        dados=pc.getc();
        pc.printf("Pressed key was %c\n", data);
        
        if (dados == '1') {
            Thread leddown(ledoff);
        }
        if (dados != '1') {
            Thread ledup(ledon);
        }
    }
}
Be the first to answer this question.