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void setup() { Serial.begin(115200); timer1 = timerBegin(0, 80, true); timerAttachInterrupt(timer1, &onTimer1, true); // Configura o Timer 1 para o primeiro disparo timerAlarmWrite(timer1, 5000000, false); timerAlarmEnable(timer1); // setupTimer1(); }

GitHub

github.com › espressif › arduino-esp32 › issues › 2603

timerBegin () / timerAlarmWrite () do not work with frequencies higher than 500 khz. (IDFGH-812) · Issue #2603 · espressif/arduino-esp32

March 20, 2019 - Hi. I need to generate pulses of 75 nanoseconds and a function that, depending on the number of pulses counted, does certain operations. I am using the functions timerBegin, timerAlarmWrite and timerAttachInterrupt, which work perfectly ...

Author espressif

Discussions

V3.0.0 alpha2 Issues with esp32-hal-timer "update"

Board ESP32 devboard Device Description Board is a data multiplexer Hardware Configuration N/A Version latest master (checkout manually) IDE Name 2.2.1 Operating System win10 Flash frequency N/A PS... More on github.com

github.com

19

October 16, 2023

v9.12 error: 'timerAlarmWrite' was not declared in this scope;

On compiling v9.12 (actually now all versions I've tried), error of: error: 'timerAlarmWrite' was not declared in this scope; did you mean 'timerWrite'? for all instances of ... More on github.com

github.com

5

August 19, 2024

Timer timerAlarmEnable() bug

#include hw_timer_t ... 80, true); timerAttachInterrupt(timer, &isrTimerExpired, true); } const unsigned long durationMs = 1000; timerAlarmWrite(timer, durationMs * 1000, false); // if the following yield() is removed, the timer will not // be enabled the second ... More on github.com

github.com

10

April 14, 2018

Timer error building infinity cube. New syntax?

That library hasn't been updated for Arduino 3.0. This is the old way to make timers: prescaler=80000000/frequency; timer = timerBegin(0, prescaler , true); timerAttachInterrupt(timer, &onTick, true); timerAlarmWrite(timer, 1, true); timerAlarmEnable(timer); and this is the new way, where 'frequency' is in Hz. timer = timerBegin(frequency); timerAttachInterrupt(timer, &onTick); timerAlarm(timer, 1, true, 0); More on reddit.com

r/esp32

11

0

June 8, 2025

GitHub

github.com › LilyGO › software › blob › master › Arduino-ESP32-IDE › hardware › espressif › esp32 › cores › esp32 › esp32-hal-timer.c

software/Arduino-ESP32-IDE/hardware/espressif/esp32/cores/esp32/esp32-hal-timer.c at master · LilyGO/software

void timerAlarmWrite(hw_timer_t *timer, uint64_t alarm_value, bool autoreload){ timer->dev->alarm_high = (uint32_t) (alarm_value >> 32); timer->dev->alarm_low = (uint32_t) alarm_value; timer->dev->config.autoreload = autoreload; } · void timerSetConfig(hw_timer_t *timer, uint32_t config){ timer->dev->config.val = config; } ·

Author LilyGO

GitHub

github.com › espressif › arduino-esp32 › issues › 8776

V3.0.0 alpha2 Issues with esp32-hal-timer "update" · Issue #8776 · espressif/arduino-esp32

October 16, 2023 - void IRAM_ATTR onRx() { detachInterrupt(rxPin); rxBitCounter = 1; rxByte = 0; timerStart(timer_1); timerAlarmWrite(timer_1, ini_time, true); timerAlarmEnable(timer_1); last_ST_time = micros(); } N/A see https://github.com/espressif/arduino-esp32/issues/8765

Author espressif

Bengtmartensson

bengtmartensson.github.io › Arduino-IRremote › esp32_8cpp_source.html

src/esp32.cpp Source File - IRremote

26 timerAlarmWrite(timer, 50, true); 27 timerAlarmEnable(timer); 28 · 29 // Initialize state machine variables · 30 irparams.rcvstate = IR_REC_STATE_IDLE; 31 irparams.rawlen = 0; 32 · 33 // Set pin modes · 34 pinMode(irparams.recvpin, INPUT); 35 } 36 · 37 void IRrecv::disableIRIn() { 38 ...

GitHub

github.com › TheDIYGuy999 › Rc_Engine_Sound_ESP32 › issues › 77

v9.12 error: 'timerAlarmWrite' was not declared in this scope; · Issue #77 · TheDIYGuy999/Rc_Engine_Sound_ESP32

August 19, 2024 - On compiling v9.12 (actually now all versions I've tried), error of: error: 'timerAlarmWrite' was not declared in this scope; did you mean 'timerWrite'? for all instances of 'timerAlarmwrite'. Using IDE v2.3.2, ESP32Devkit1 board. Have a...

Author TheDIYGuy999

GitHub

github.com › PaulStoffregen › TimeAlarms › blob › master › TimeAlarms.h

TimeAlarms/TimeAlarms.h at master · PaulStoffregen/TimeAlarms

Time library add-on, schedule alarms to occur at specific dates/times - PaulStoffregen/TimeAlarms

Author PaulStoffregen

GitHub

github.com › PaulStoffregen › TimeAlarms

GitHub - PaulStoffregen/TimeAlarms: Time library add-on, schedule alarms to occur at specific dates/times · GitHub

Time library add-on, schedule alarms to occur at specific dates/times - PaulStoffregen/TimeAlarms

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GitHub

github.com › espressif › arduino-esp32 › issues › 1313

Timer timerAlarmEnable() bug · Issue #1313 · espressif/arduino-esp32

April 14, 2018 - #include <esp32-hal-timer.h> hw_timer_t *timer = NULL; void IRAM_ATTR isrTimerExpired() { Serial.println("timer expired"); } void startTimer() { Serial.println("startTimer()"); if (timer == NULL) { timer = timerBegin(0, 80, true); timerAttachInterrupt(timer, &isrTimerExpired, true); } const unsigned long durationMs = 1000; timerAlarmWrite(timer, durationMs * 1000, false); // if the following yield() is removed, the timer will not // be enabled the second time yield(); timerAlarmEnable(timer); Serial.print("isEnabled: "); Serial.println(timerAlarmEnabled(timer)); } void stopTimer() { Serial.println("stopTimer()"); if (timer != NULL) { timerAlarmDisable(timer); timerDetachInterrupt(timer); timerEnd(timer); timer = NULL; } } void setup() { Serial.begin(115200); startTimer(); stopTimer(); startTimer(); } void loop() { // not used delay(1000); }

Author espressif

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reddit.com › r/esp32 › timer error building infinity cube. new syntax?

r/esp32 on Reddit: Timer error building infinity cube. New syntax?

June 8, 2025 -

Building, https://github.com/mecharms/Infinity-LED-CUBE/tree/main

I believe the problem is the timer is written under old format so does not work with new version in IDE.

Does anyone know if this is just a syntax fix?

 //--------------------------------
  // Configure Prescaler to 80, as our timer runs @ 80Mhz
  // Giving an output of 80,000,000 / 80 = 1,000,000 ticks / second
  timer = timerBegin(0, 80, true);                
  timerAttachInterrupt(timer, &onTime, true);    
  // Fire Interrupt every 1m ticks, so 1s
  timerAlarmWrite(timer, 5000000, true);      
  timerAlarmEnable(timer);
  //--------------------------------

C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino: In function 'void setup()':

C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino:3829:21: error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'

3829 | timer = timerBegin(0, 80, true);

| ~~~~~~~~~~^~~~~~~~~~~~~

In file included from C:\Users\Jason\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32/esp32-hal.h:98,

from C:\Users\Jason\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\libraries\Wire\src/Wire.h:33,

from C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino:2:

C:\Users\Jason\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32/esp32-hal-timer.h:35:13: note: declared here

35 | hw_timer_t *timerBegin(uint32_t frequency);

| ^~~~~~~~~~

C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino:3830:23: error: too many arguments to function 'void timerAttachInterrupt(hw_timer_t*, void (*)())'

3830 | timerAttachInterrupt(timer, &onTime, true);

| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

C:\Users\Jason\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32/esp32-hal-timer.h:50:6: note: declared here

50 | void timerAttachInterrupt(hw_timer_t *timer, void (*userFunc)(void));

| ^~~~~~~~~~~~~~~~~~~~

C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino:3832:3: error: 'timerAlarmWrite' was not declared in this scope; did you mean 'timerWrite'?

3832 | timerAlarmWrite(timer, 5000000, true);

| ^~~~~~~~~~~~~~~

| timerWrite

C:\Users\Jason\Downloads\Infinity-LED-CUBE-main\Infinity-LED-CUBE-main\code\cube_led\cube_led.ino:3833:3: error: 'timerAlarmEnable' was not declared in this scope; did you mean 'timerAlarm'?

3833 | timerAlarmEnable(timer);

| ^~~~~~~~~~~~~~~~

| timerAlarm

exit status 1

Compilation error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'

Thank you!

Top answer

1 of 4

2

I had some trouble with timers and alarms on my esp32 doit devboard. Spent many hours trying to debug, end of the days its a silicon issue with the REV0 chips. Not sure if this applies to you but more information can be found here: https://github.com/espressif/arduino-esp32/issues/1313

2 of 4

2

I managed to get it working. The trick that worked for me was to reset the timer (counter) before each use, with the following statement: timerRestart() Below is a little pseudo sketch, only showing the relevant statements, to give you or anyone finding this post later, an idea of what worked for me. #include // only needed to get ESP32 frequency detail hw_timer_t * tmrTEST = NULL; // timer used for TESTING unsigned long lngTimerStart = 0; // system micro-seconds at timer start int tmrDuration = 5; // run timer for 5 seconds // Interrupt Service Routine called when TEST timer fires. void IRAM_ATTR isrTimerTEST() { Serial.print(" >>>>> TEST TIMER ISR: "); Serial.print( micros() ); Serial.print(" diff="); Serial.println((micros()-lngTimerStart)/1000/1000); } void setup() { Serial.begin(115200); ... // Set up TEST timer.. tmrTEST = timerBegin (1, 80, true); // use ESP32 Timer 1, pre-scale 80 (for 80MHz freq), count up. timerAttachInterrupt (tmrTEST, &isrTimerTEST, true); // attach the function to call when timer interrupt fires. Edge. Serial.print(" >> CPU Freq: "); Serial.println(getCpuFrequencyMhz()); Serial.print(" >> XTL Freq: "); Serial.println(getXtalFrequencyMhz()); Serial.print(" >> APB Freq: "); Serial.println(getApbFrequency()); ... } void loop() { ... if (tmrDuration > 0) { // initiate TEST timer. duration in micro-seconds. False to run once. timerAlarmWrite(tmrTEST, (tmrDuration * 1000000), false); timerRestart(tmrTEST); // reset timer counter timerAlarmEnable(tmrTEST); // start the timer lngTimerStart = micros(); Serial.print(" >>>>> TimerTEST dur="); Serial.print(tmrDuration); Serial.print(" start: "); Serial.println( lngTimerStart ); } ... } Thanks for your replies and time !

GitHub

github.com › crankyoldgit › IRremoteESP8266 › issues › 2053

Library's Non-declared variables & too many arguments to function issues. · Issue #2053 · crankyoldgit/IRremoteESP8266

December 20, 2023 - Version/revision of the library used 2.8.6 Describe the bug Variables not declared: timerAlarmEnable; timerAlarmWrite; timerAlarmDisable(timer); gpio_intr_disable((gpio_num_t)params.recvpin); gpio_...

Author crankyoldgit

GitHub

github.com › z01ne › MyAlarm

GitHub - z01ne/MyAlarm: ⏰⏳ An Arduino library to schedule alarms and timers to occur at specific dates/times, support multiple days per alarm.

⏰⏳ An Arduino library to schedule alarms and timers to occur at specific dates/times, support multiple days per alarm. - z01ne/MyAlarm

Author z01ne

GitHub

github.com › espressif › arduino-esp32 › issues › 8233

timer_isr_callback_add - register interrupt failed. Platformio project · Issue #8233 · espressif/arduino-esp32

May 19, 2023 - timer_1 = timerBegin(1, 80, true); . .code above in a function that calls the function with the code below . timerAttachInterrupt(timer_1, &isr_Comm20msLow, true); timerAlarmWrite(timer_1, 200, false); // 20ms timerAlarmEnable(timer_1); . .code for ISR below .

Author espressif

GitHub

github.com › espressif › arduino-esp32 › blob › master › cores › esp32 › esp32-hal-timer.h

arduino-esp32/cores/esp32/esp32-hal-timer.h at master · espressif/arduino-esp32

Arduino core for the ESP32 family of SoCs. Contribute to espressif/arduino-esp32 development by creating an account on GitHub.

Author espressif

GitHub

github.com › danilobjr › timer

GitHub - danilobjr/timer: Alarms & Clock clone from Windows 10 built as a PWA

Alarms & Clock clone from Windows 10 built as a PWA - danilobjr/timer

Author danilobjr

ESP32 Forum

esp32.com › viewtopic.php

Changing timer alarm in ISR - ESP32 Forum

February 25, 2019 - I've been struggling around with a similar problem and then found that the initial code posted by Thomas1will work soon (esp32 v1.05): ESP32 Library file "cores/esp32/esp32-hal-timer.c" has been fixes by applying IRAM_ATTR to all functions. (see https://github.com/espressif/arduino-es ...

DeepBlue

deepbluembedded.com › home › blog › esp32 timers & timer interrupt tutorial (arduino ide)

ESP32 Timers & Timer Interrupt Tutorial (Arduino IDE) – DeepBlueMbedded

February 17, 2025 - #define LED 21 hw_timer_t *Timer0_Cfg = NULL; void IRAM_ATTR Timer0_ISR() { digitalWrite(LED, !digitalRead(LED)); } void setup() { pinMode(LED, OUTPUT); Timer0_Cfg = timerBegin(0, 80, true); timerAttachInterrupt(Timer0_Cfg, &Timer0_ISR, true); timerAlarmWrite(Timer0_Cfg, 1000, true); timerAlarmEnable(Timer0_Cfg); } void loop() { // Do Nothing!