Ticker library does not work with a function with parameters

Projects Programming
1

I am trying to use the Ticker library and while the example works fine I am having an issue with getting it to work when I have a void function with parameters.
See code example below (which does not worK)

#include "Ticker.h"

void printMessage(int a, int b);

Ticker timer1(printMessage, 0, 1);


void setup() 
{
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
  delay(2000);
  timer1.start();
  printMessage(1, 1);
}

void loop()
{
  timer1.update();
}


void printMessage(int a, int b) 
{
  if (a == 1 && b == 1)
  {
    Serial.println("Hello!");
  }
  else
  {
    Serial.println("Goodbye");
  }
}

and this the error I get at compile

Arduino: 1.8.15 (Windows 10), Board: "LOLIN(WEMOS) D1 R2 & mini, 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), v2 Lower Memory, Disabled, None, Only Sketch, 921600"

Ticker:5:33: error: no matching function for call to 'Ticker::Ticker(void (&)(int, int), int, int)'

 Ticker timer1(printMessage, 0, 1);

                                 ^

C:\Users\proie\AppData\Local\Temp\arduino_modified_sketch_811228\Ticker.ino:5:33: note: candidates are:

In file included from C:\Users\proie\AppData\Local\Temp\arduino_modified_sketch_811228\Ticker.ino:1:0:

C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker\src/Ticker.h:32:5: note: Ticker::Ticker()

     Ticker();

     ^

C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker\src/Ticker.h:32:5: note:   candidate expects 0 arguments, 3 provided

C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker\src/Ticker.h:29:7: note: Ticker::Ticker(const Ticker&)

 class Ticker

       ^

C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker\src/Ticker.h:29:7: note:   candidate expects 1 argument, 3 provided

C:\Users\proie\AppData\Local\Temp\arduino_modified_sketch_811228\Ticker.ino: In function 'void setup()':

Ticker:13:10: error: 'class Ticker' has no member named 'start'

   timer1.start();

          ^

C:\Users\proie\AppData\Local\Temp\arduino_modified_sketch_811228\Ticker.ino: In function 'void loop()':

Ticker:19:10: error: 'class Ticker' has no member named 'update'

   timer1.update();

          ^

Multiple libraries were found for "Ticker.h"

 Used: C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker

 Not used: C:\Users\proie\Dropbox\ARDUINO\arduino 1.8.9\libraries\Ticker

 Not used: C:\Users\proie\Dropbox\ARDUINO\arduino 1.8.9\libraries\Ticker-master

exit status 1

no matching function for call to 'Ticker::Ticker(void (&)(int, int), int, int)'

Am I missing something as the examples given does not have a void function with parameters.

2

What type of Arduino board are you using? The library does not support callbacks with parameters for AVR-based boards. But, if it's ARM or ESP-based, you can specify the callback using std::function and bind an argument to it using std::bind. From Ticker.h:

#if defined(__arm__) || defined(ESP8266) || defined(ESP32)
#include <functional>
using fptr = std::function<void()>;
#else
typedef void (*fptr)();
#endif
3 
void timerMessage()
{
  printMessage(0, 1);
}

Ticker timer1(timerMessage);
4

I am using an esp. Sorry I am not that advanced so i do not understand your answer

5

Thanks for that i will try that

6

Looking at the compile error message i noticed this

Used: C:\Users\proie\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3\libraries\Ticker

 Not used: C:\Users\proie\Dropbox\ARDUINO\arduino 1.8.9\libraries\Ticker

 Not used: C:\Users\proie\Dropbox\ARDUINO\arduino 1.8.9\libraries\Ticker-master

Does this mean the ticker library comes with the esp package so there is no need to download and install in my library?

7

The ESP8266? Looks like it. Especially if your sketch compiled without error.

8

It probably means you have the library installed in too many places. You're also using an old version of the Arduino IDE (1.8.9) latest is v1.8.19.

Also, you haven't answered:

EDIT:
It does indeed look like there's an ESP8266-specific version of Ticker (by a different author) in the ESP8266 core. It's API is incompatible with the one installed by the Arduino IDE's Library Manager.

9

I did in post 4

10

"ESP" could be ESP8266 or ESP32. They're very different. Sometimes it's also helpful to identify the specific board you're compiling for.

11

I am using ESP8266

12

I have now uninstalled the Ticker library and am using the ESP8266 in built Ticker library and I now see your point of binding the argument. Thanks

13

Great, post your code as others might find it useful.

14

Working code for reference

#include "Arduino.h"
#include "Ticker.h"

#define LED1 2
#define LED2 4
#define LED3 12
#define LED5 15


class ExampleClass {
public:
  ExampleClass(int pin, int duration)
    : _pin(pin), _duration(duration) {
    pinMode(_pin, OUTPUT);
    _myTicker.attach_ms(_duration, std::bind(&ExampleClass::classBlink, this));
  }
  ~ExampleClass(){};

  int _pin, _duration;
  Ticker _myTicker;

  void classBlink() {
    digitalWrite(_pin, !digitalRead(_pin));
  }
};

void staticBlink() {
  digitalWrite(LED2, !digitalRead(LED2));
}

void scheduledBlink() {
  digitalWrite(LED3, !digitalRead(LED2));
}

void parameterBlink(int p, bool a)
{
  if(p == 1 && a == true)
  {
    Serial.println("Hello");
  }
  else
  {
    Serial.println("Goodbye");
  }
}

Ticker staticTicker;
Ticker scheduledTicker;
Ticker parameterTicker;
Ticker lambdaTicker;

ExampleClass example(LED1, 100);


void setup() {
  Serial.begin(9600);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED5, OUTPUT);
  
  staticTicker.attach_ms(100, staticBlink);
  scheduledTicker.attach_ms_scheduled(100, scheduledBlink);
  parameterTicker.attach_ms(100, std::bind(parameterBlink, 0, true));

  lambdaTicker.attach_ms(100, []() {
    digitalWrite(LED5, !digitalRead(LED5));
  });
}

void loop() {}
1 Like
15

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