ESP32 Forum

Posted: **Fri Dec 08, 2023 10:11 am**

I am using the sample code in link:
https://espressif-docs.readthedocs-host ... timer.html
my platform Arduino 2.2.1
my Board library : Esp32 by Espressif systems 2.0.11
And I get erros for examle :

C:\Users\leno\AppData\Local\Temp\.arduinoIDE-unsaved2023118-15208-5agu7p.d9ara\sketch_dec8a\sketch_dec8a.ino: In function 'void setup()':
C:\Users\leno\AppData\Local\Temp\.arduinoIDE-unsaved2023118-15208-5agu7p.d9ara\sketch_dec8a\sketch_dec8a.ino:7:29: error: too few arguments to function 'hw_timer_t* timerBegin(uint8_t, uint16_t, bool)'
timer = timerBegin(1000000);
^
In file included from C:\Users\leno\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\cores\esp32/esp32-hal.h:92,
from C:\Users\leno\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\cores\esp32/Arduino.h:36,
from C:\Users\leno\AppData\Local\Temp\.arduinoIDE-unsaved2023118-15208-5agu7p.d9ara\sketch_dec8a\sketch_dec8a.ino:1:
C:\Users\leno\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\cores\esp32/esp32-hal-timer.h:33:14: note: declared here
hw_timer_t * timerBegin(uint8_t timer, uint16_t divider, bool countUp);

Etc...
Why?

Posted: **Fri Dec 08, 2023 10:29 am**

Hi sevketk,

The timer library, and many other are being refactored in order to increase the compatibility with the Arduino. The documentation reflects the master branch and not the latest release version, today is the 2.0.14.

You can use the migration guide to see all the refactored APIs.

If you are using the 2.0.11, the example you should try is here: timer examples for 2.0.11 version.
Alternatively, you can use the 2.0.11 version and use the link I've shared, or you can use the alpha version of the 3.0.0.

Posted: **Fri Dec 08, 2023 11:16 am**

Ok. Thank you.
As far as I understand, the operations I want to do with the timer are
It is wrong to use it inside "void ARDUINO_ISR_ATTR onTimer(){ } ". I have to use it inside the "loop". Otherwise, when my operations are delayed a little, I get the error "Guru Meditation Error: Core 1 panic'ed (Interrupt wdt timeout on CPU1). " Did I understand correctly?
for example
Wrong:

Code: [Select all] [Expand/Collapse]

void ARDUINO_ISR_ATTR onTimer(){
   dosomething();//*********** what i want to do *******
}

GeSHi © Codebox Plus Extension

correct:

Code: [Select all] [Expand/Collapse]

void ARDUINO_ISR_ATTR onTimer(){
  // Increment the counter and set the time of ISR
  portENTER_CRITICAL_ISR(&timerMux);
  isrCounter++;
  lastIsrAt = millis();
  portEXIT_CRITICAL_ISR(&timerMux);
  // Give a semaphore that we can check in the loop
  xSemaphoreGiveFromISR(timerSemaphore, NULL);
  // It is safe to use digitalRead/Write here if you want to toggle an output
}
void loop() {
  // If Timer has fired
  if (xSemaphoreTake(timerSemaphore, 0) == pdTRUE){
    uint32_t isrCount = 0, isrTime = 0;
    // Read the interrupt count and time
    portENTER_CRITICAL(&timerMux);
    isrCount = isrCounter;
    isrTime = lastIsrAt;
    portEXIT_CRITICAL(&timerMux);
    // Print it
    
      dosomething();//*********** what i want to do *******
  }
}

>>>>>
In its simplest form, what kind of code should I write for an operation that I want to perform that takes 2000 ms and will occur every 500 ms?

Posted: **Fri Dec 08, 2023 12:00 pm**

I think you need a task, not a timer.
examples/FreeRTOS

Posted: **Fri Dec 08, 2023 5:44 pm**

If the code you have posted is actually what you are trying to do, and you having something that takes 2000ms running every 500ms, then your problem is very likely race conditions.
You can use a timer (or Ticker if you don't need an interrupt) to start the process, but you shouldn't be using the critical mutex. Make your own mutex specific to this task, and put a realistic timeout on it, or else you will get the processes backed up and exhaust your memory.

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