When 2 Software Timers are used in Electron, device falls to SOS

Troubleshooting
1

Hi,

When I use 2 software timers in the electron, the device enters SOS mode as soon as the second timer is triggered.

I have one timer every 1000 mili seconds, and a second one every 500 mili seconds. No long running code, I just set a couple of variables and if I keep only one of the timers (either of them) it won’t fall to SOS.

Is there an issue with 2 timers or more or is there a restriction I am not aware of, beside the 10 timer limit? Or is there special code I should call within the ISR or method call?

2

This code does work

volatile int a;
volatile int b;

void _1000() { a++; }

void _500() { b++; }

Timer t1(1000, _1000);
Timer t2(500, _500);

void setup() {
    t1.start();
    t2.start();
}

void loop() 
{
  Serial.printlnf("%d\t%d", a, b);
  delay(1000);
}

So I’d suspect it might still rather have something to do with your code inside the handlers rather than the Software Timer as such.
e.g. using Serial.print() is discouraged in timer callbacks.

It’s always safer to post the code than just describing what might or might not happen in your code.

2 Likes
3

Hi @ScruffR

Thanks for the help.
I was using Serial.print statements… Didn’t saw in the documentation that this was discouraged!

Will post code next time.

4

In the function that calls the timer should be a less code. Just like with interrupt only need to set the variable.
For example using the following scheme for the program.

volatile int a;
volatile int b;

bool flag_1 = false;
bool flag_2 = false;

void _1000() { flag_1 = true; }

void _500() { flag_2 = true; }

Timer t1(1000, _1000);
Timer t2(500, _500);

void setup() {
    t1.start();
    t2.start();
}

void loop() 
{
  Serial.printlnf("%d\t%d", a, b);
  delay(1000);
  
  if(flag_1 == true)
  {
      TEST_1();
  }
  
  if(flag_2 == true)
  {
      TEST_2();
  }
  
  
}


void TEST_1()
{
    
    flag_1 = false;
    
    a++;
    
    // blocking code (for example http client or serial print....)
}

void TEST_2()
{
   flag_2 = false; 
    
    b++;
     // blocking code (for example http client or serial print....)
}
5

Got it… Thank you!