Marcus Parker

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10 years, 2 months ago.

Ticker stops working?

I am using a program which uses a ticker to call a function every second, I've noticed a problem that it stops working after a few hours. For example in this simple program led2 stops working after a few hours but led1 still flashes when the button is pressed:

#include "mbed.h"

DigitalOut led(PC_10);
DigitalOut led2(PC_12);
DigitalIn butPush(PB_2);

Ticker led1on;
Timeout led1off;
Timeout to1;
Timeout to2;

void routine(int x, float y)
{
    for(int i = 0; i <= x; i++)
    {
        led = 1;
        wait(y);
        led = 0;
        wait(y);    
    }    
}

void led1off_cb(void)
{
    led2 = 0;    
}

void led1on_cb(void)
{
    led2 = 1;
    led1off.detach();
    led1off.attach(&led1off_cb, 0.05);    
}

int main() 
{
    led2 = 1;
    
    led1off.attach(&led1on_cb, 0.05);
    led1on.attach(&led1on_cb, 1);
    
    while(1) 
    {
        if(butPush.read() == 0) 
        {
            routine(10, 0.2);
        }
    }
}

I've tested it in different programs with the same results, I've seen reference to using RTC for long intervals but does that apply to calling every second for a long time? I'm using the Nucleo F401 and have updated all the libraries, is there a problem for these timing routines for this board?

1 Answer

Erik -
10 years, 2 months ago.

The problem is you updated all your libraries ;).

Option 1: Downgrade mbed lib two versions (IIRC to 89). You can do this from the revision window.

Option 2: Remove your mbed library and import mbed-src (http://developer.mbed.org/users/mbed_official/code/mbed-src/).

In the most recent mbed version a bug was introduced in the Ticker code. This bug has been fixed since then (which is why it works fine in the mbed-src), in the next mbed version it will be fixed again.

Accepted Answer