Top. Home; Quick links. This function will start the timer which will trigger every ‘period’ microseconds. I did need a multiple MHz blink, and thus a nanosecond delay between state changes. The ESP32 has two cores, with 32 interrupts each. hatenablog. This function will start the timer which will trigger every ‘period’ microseconds. $endgroup$ – Luke Bayes. Realistically you'd want your worst case. The motor interface type must be set to 1 when using a step and direction driver. I also used portTICK_RATE_MS but the speed didnt change . Sets how quickly the timer counter is “ticking”. machine. Firstly, we will see an example to control an LED with ESP32 and an. Neopixels have great possibilties. If you need better resolution, micros () may be the way to go. When I trigger an interrupt during the delay function the interrupt stops working. Pulse signal is provided through a PA4 pin of TM4C123 microcontroller. I read the first block but never the second. When ı create a task using xTaskCreate() function and adding some delay in the task function. See Sleep Modes for these sleep modes and sub sleep modes. ESP32 crashes when I call the function after ~1 hour 20 minutes of usage, because esp_timer_get_time() return a int64_t value and is parsed as uint32_t in. Sometimes it delays for exactly 2 seconds but sometimes it misses 10ms. You can have a look at ESP_FSWebServer to see SPIFFS and ESP32 are working very well together. After some playing and toying I decided to try esp-idf to. Delay a task for a given number of ticks. Go to left sidebar of the IDE, click the “ New file ” button and it will create a new file and it will open with in editor window as a untitled name. Bakedintheusa • 5 mo. There will be a delay between the input changing state and your interrupt routine getting control. 00 Timer is alarm enabled: 0 Timer is started: 1 Timer seconds: 0. The first time, the value is wrong of course, but after that, it is the microseconds outside the loop() function. delay() Specifies program pauses a number of milliseconds. the source i found that setting the static IP to 0,0,0,0 will in effect force the DHCP acquisition after the 50ms delay which has been added in response to this issue #5733. FreeRTOS delay in microseconds. I am trying the run stepper motor with the tmc2208 driver and ı want to delay in microseconds like 5uS or 10 uS. -Deep sleep (esp32/buildin libary)-Using RTC memory to store deep sleep persistent variabele (esp32/buildin libary) Warning: Avoid using the non working lwip based SNTP/DNS call's in combination of the W5500/Ethernet driver, a it is not integrated in LWIP. Re: vTaskDelay () vS. This is the second part of a series of ESP-IDF tutorials that I will complete as I learn stuff. 00 Timer alarm seconds: 1. I test this code, the reply is 555-496=59mS, What caused the delay？Thanks! At 115200 bits per second, a UART transmission of just one character takes about 10 to 11 bits in time, which means about 90 microseconds. -. Deixe-a para quando estiver programando um Arduino. Replacing liblwip. Internally, esp_timer uses a 64-bit hardware timer. Arm/Start the timer , in case you detached the interrupt attach it back. 6V and that was enough for the 3. According to the documentation esp_sleep_enable_timer_wakeup accepts a uint64_t type for its requested duration parameter. ESP32 Timer Interrupt using ESP-IDF. This program creates a single WiFiServer and WiFiClient object. I have ensured that this is the only task with priority 1. Regards, Ritesh Prajapati. Overview. 3. COROUTINE_DELAY_SECONDS(seconds): yields back execution for seconds. The interrupt is triggered with the rising and falling edge and store the start & endtime with the funktion micros() in two diffrent variables. Capacitor from Vdd to the MOSFET gate along with a resistor from gate to Ground. * @brief Get time in microseconds since boot * @return number of microseconds since esp_timer_init was called (this normally * happens early during. The calculation of the duration take place later. Since I am taking differences the constant term is not important, and the 130 ns is acceptable. // This code is for testing analogRead delay // Compiled using Arduino IDE // ESP32-WROOM-DA Module // Board is ESP WROOM 32 made by // Does nothing more than fire a periodic timer // interrupt every 200 microseconds and an analogRead // inside the ISR: PinTEST is high before read, // then is low. ESP32 uses two hardware timers for the purpose of keeping system time. Hardware: Board: ESP32 Dev Module Core. when the timer reach b_value do something. Serial communication that appears. Echo (Echo Pulse): This pin outputs a pulse from the sensor. The unit restarts each minute, around 00 seconds. There are 7 kinds of micro steps (1, 2 / A, 2. analogWrite (4, 5, 1000, 10, 0); analogWrite (5, 5, 1000, 10, 4); analogWrite (12, 5, 1000, 10, 8); EDIT 1: If getting all 3 signals to synchronize properly is an issue, then using the ESP32's MCPWM hardware might be an option. In this post we are going to learn how to get started with the Ticker library, using the ESP32 and the Arduino core. I also used portTICK_RATE_MS but the speed didnt change . The function timerBegin (uint8_t id, uint16_t prescaler, bool countUp) allows to configure the timer : The ESP32 has 4 independent timers, selected by an id between 0 and 3. Hello community, I made a function that should be able to create a delay for a certain number of microseconds, here the code. I also used portTICK_RATE_MS but the speed didnt change . Step 3: Complete connection. 2 also, with 96 MHz clock. Top. I dont get any delay even if I add some different delays. ESP32 crashes when I call the function after ~1 hour 20 minutes of usage, becaus. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. The part of interest is this: startTime = micros (); while (digitalRead (capPos) == HIGH) { delayMicroseconds (1); } endTime = micros (); The while loop I want to. The constant portTICK_PERIOD_MS can be used to calculate real time from the tick rate - with the resolution of one tick period. I also used portTICK_RATE_MS but the speed didnt change . II. Here's a summary of the problem and the steps I have taken so far: Symptoms: - I have implemented the pulse output using the LEDC module on the ESP32, triggered by an input signal. bool: allowThreadYield: True to allow yielding the thread. Then stop until the program receive other 3 values. Regards, Ritesh Prajapati. Sets how quickly the timer counter is “ticking”. kolban Posts: 1683 Joined: Mon Nov 16, 2015 4:43 pm Location: Texas, USA. When ı create a task using xTaskCreate() function and adding some delay in the task function. " Microsecond delay within task. Click on the Preferences menu item. You say "2 and 8 µS, or even more, is OK. When ı create a task using xTaskCreate() function and adding some delay in the task function. If you have to do something that is extremely time critical for a short period of time you can suspend interrupts and context switches. h>. Description. I dont get any delay even if I add some different delays. github. Add a signal diode in parallel with the resistor (A to ground,. Here is what you need to do to install the ESP32 boards into the Arduino IDE: Open the Arduino IDE. 25 nanoseconds) software overhead to acquire the count. A tick is what you configure it to be. I would like to toggle an output pin in the order of microseconds so use the function delayMicroseconds. I dont get any delay even if I add some different delays. Here's a summary of the problem and the steps I have taken so far: Symptoms: - I have implemented the pulse output using the LEDC module on the ESP32, triggered by an input signal. DFRobot Beetle ESP32-C3 Datanoise PicoADK Deneyap Kart Deneyap Kart 1A Deneyap Kart 1A v2 Deneyap Kart G Deneyap Mini Deneyap Mini v2 DynOSSAT-EDU-EPS DynOSSAT-EDU-OBC E-Fidget ELECFREAKS PICO:ED ES3ink ESP 12k NodeMCU ESP32 Devkit V1 ESP32-C3-DevKitM-1 ESP32-C6-DevKitC-1-N8 ESP32-C6-DevKitM-1. Step 4: Connect the potentiometer to the ESP32. Skip to content. There are a thousand microseconds in a millisecond, and a million microseconds in a second. I dont get any delay even if I add some different delays. com ↑以前ESP32で赤外線の送受信を行うプログラムを紹介しました。 このプログラムの中で「ESP32にdelayMicrosecondsがない」としてシステム時間の計算をして擬似的にμsのdelayを行なっていました。しかし最近色々調べてみると、実はESP32にもμs単位でのdelayを行う関数が存在している. Unless an action must be executed in the order of mere microseconds, it will be handled in the. Do it correctly. To say it works is really stretching it. It uses the STM32's DWT_CYCCNT register, which is specifically designed to count actual clock ticks, located at address 0xE0001004. The ESP32 is in deep sleep mode now. The dynamic nature of the timer essentially means we need a place to store a) the number of seconds that an output has been ON for and b) the number of seconds that a user wants the output on for. Post by HelWeb » Wed May 01, 2019 4:32 pm . The actual time that the task remains blocked depends on the tick rate. We have set the period as 5000ms which means 5 seconds. 関数解説 SerialBT. time. The delayMicroseconds () function accepts a single integer (or number) argument. Delay a task for a given number of ticks. I had an issue with the chip delivering bad calibration data. I also used portTICK_RATE_MS but the speed didnt change . They are all 64-bit (54-bit for ESP32-C3) generic timers based on 16-bit pre-scalers and 64-bit (54-bit for ESP32-C3) up / down counters which are capable of being auto-reloaded. anon36290542 May 1, 2016, 2:36pm 18. After this time, the interrupt callback is executed. The long type on ESP32 has a maximum value of 2147483647 which is as you said, "about half an hour" (not quite 36 minutes) worth of microseconds. Your timer clock is at 1MHz (80MHz/80 = 1MHz) which generates a tick at 1uS interval (1/1MHz = 1uS). Para delays mais. When ı create a task using xTaskCreate() function and adding some delay in the task function. Index to my micropython libraries. (Actually to be correct I believe one should have be added to the # milliseconds in this calculation). hatenablog. delayMicroseconds() works in arduino. Step 2: Connect the stepper motor. timer speed (Hz) = Timer clock speed (Mhz) / prescaler. More knowledgeable programmers usually avoid the use of delay () for timing of events longer than 10’s of milliseconds unless the Arduino sketch is very simple. Trig (Trigger): This pin is used to initiate the ultrasonic pulse. Make sure you’re using the correct board and COM port. Free book on ESP32 available here:. Are you using the Arduino platform for ESP32 development? If so, I think `delayMicroseconds()` is available. Pauses the program for the amount of time (in microseconds) specified by the parameter. Additionally, we’ll need to increment. The ESP32 chip contains two hardware timer groups. I am trying the run stepper motor with the tmc2208 driver and ı want to delay in microseconds like 5uS or 10 uS. ticks_ms ¶ESP32_New_TimerInterrupt. You need to have better explanation of what you means "I want to calculate time interval with timers". Timer callbacks can be dispatched by two methods: Exact delays. If you need to generate a 1-minute time delay with Arduino, you can still use the delay() function. Postby PeterR » Fri Jun 12, 2020 1:02 am. Using "nop" command gives me 0. print()は、シリアル通信で文字列を送信します。 SerialBT. I was using a delay to slow down the publishing of data until my teacher told me about the interupt. source ·. For a full example, refer to PlatformIO ESP-IDF ESP32 blink. However, be aware that micros. フーリエ変換をArduino(厳密にはESP32)で実装・検証したい方; Arduino初心者～中級者向けの記事です。 1. The ultrasonic sensor HC-SR04 gave me a headache aswell. The ESP32 SoCs contains from 2 to 4 hardware timers. I am trying the run stepper motor with the tmc2208 driver and ı want to delay in microseconds like 5uS or 10 uS. Top 1 post • Page 1 of 1We have 10 and 40 microseconds delay requirement for our application development purpose. With a neopixel you can show values in between with smoothly changing colors from for instance blue. We’ve. Measuring distances with the HC-SR04 ultrasonic sensor with an ESP32 in Arduino code. Do you really want to block and spin for 9ms? I do. First, we will learn to interface HC-SR04 with ESP32. For delays longer than a few thousand microseconds, you should use the delay() function instead. But make sure to do the time unit conversion and pass to it the desired time in milliseconds. With a max count of 16 and a prescaler of 8 you've only got 8 microseconds. as well. "Microsecond delay within task. As you can see from the logs, the time keeps deviating. delay() Specifies program pauses a number of milliseconds. 1. Optimizing execution speed is a key element of software performance. dmaxben Posts: 108 Joined: Thu Nov 16, 2017 6:04 pm. The exact hardware timer implementation used depends on the target, where LAC timer is used for ESP32. 1000 microseconds is one milliseconds and 1000 milliseconds is one second (the. Note that this is busy-waiting, so unlike vTaskDelay it does not allow other tasks to run (it just burns CPU cycles. But browsing the specifics and some online resources, it's clearly stated that the ESP32, unlike the ESP8266, is able to deep sleep for over a year. byte currRefreshRate = refreshRate; // to start. Finally I created the code below that does not display a zero but the text "resetting the sensor" and then pushes the signal of the echo into LOW. 4. Use a N-Channel MOSFET. ini. Internally, esp_timer uses a 64-bit hardware timer, where the. Arduino micros () Function. A remote program on a PC connects to this server and then the ESP32 sends a 100byte message 100. Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. , matrix, slider), so that a larger area. I haven't measured this, but it wouldn't be surprising if this was a few tens of microseconds. This function can help install the low level putc function for esp_rom. i. We will solve this by using our RTC memory. Top. 1 milliseconds) to read. time. The ROM function ets_delay_us() (defined in rom/ets_sys. This function will return timer structure if configuration is successful. I chose the ESP32 because of its 240MHz clock, but it still seems to be having trouble. $endgroup$Thanks for the ideas. delayMicroseconds() calls it at least twice. ticks_ms ¶Here's a summary of the problem and the steps I have taken so far: Symptoms: - I have implemented the pulse output using the LEDC module on the ESP32, triggered by an input signal. Delay a task until a specified time. With a normal LEDs you can show the state of a system (blue= too cold, red= too hot). [env:esp32] platform = espressif32 board = esp32dev framework = arduino monitor_speed = 115200 upload_speed = 921600. They are all 64-bit (54-bit for ESP32-C3) generic timers based on 16-bit pre-scalers and 64-bit (54-bit for ESP32-C3) up / down counters which are capable of being auto-reloaded. Regards, Ritesh Prajapati. Free book on ESP32 available here:. Re: help delayMicroseconds() on esp? Post by dmaxben » Wed Aug 04, 2021 12:36 pm . The esp_intr_alloc () abstraction exists to hide all these. Top. cpp 📋 Copy to clipboard ⇓ Download. This is because of interactions with the millis() and delay() functions, which share the same internal timer used to generate those PWM outputs. arduino. I would like to toggle an output pin in the order of microseconds so use the function. Its argument is the struct_time or full 9-tuple (since the dst flag is needed; use -1 as the dst flag if it is unknown) which expresses the time in local time, not UTC. So for a hundred microsecond delay do: for(int loop = 0; loop < 3; loop++) {int samp = adc1_get_raw((adc1_channel_t)channel2); } It goes without saying that this a workaround for a systematic solution; This delay is jittery, as the higher priority processes will interfere. 2. Measure the battery voltage while trying to run the motor. At the moment ESP32 plugged to serial monitor about 23hours ticking, the millis() was working fine. ESP32 Timers. I am trying the run stepper motor with the tmc2208 driver and ı want to delay in microseconds like 5uS or 10 uS. According to the features used by an application, there are some sub sleep modes. Hi everyone! I want to implement a timing delay of 1us in my program. 3. microsteps set to 8X* (M2 to ground). I have added a delay after the Serial. vTaskDelayUntil is absolute in terms of the ticks set by scheduler and FreeRTOS Kernel. ESP_OK on. This method is set to be called every ~5sec as a software WDT, you should move EVERYTHING out of this method and have a background task that is woken up by this method. I call vTaskDelay for various reasons. Timer callbacks can be dispatched by two methods: ESP_TIMER_TASK ESP_TIMER_ISR. on May 31, 2018. Returns the number of microseconds since the Arduino board began running the current program. Top. Step-By-Step Instructions To Connect The TB6600 Module with ESP32. Postby PeterR » Fri Jun 12, 2020 1:02 am. Your Chrono and Webserver tasks simply won't work the way you've written them. When ı create a task using xTaskCreate() function and adding some delay in the task function. This tutorial shows how to interface HC-SR04 or HY-SR05 Ultrasonic sensors with ESP32 for contactless distance measurement. Arduino example sketch "Blink" allows you to specify "delay ()" between state changes in microseconds. You can easily find or write a piece of code that delays for 12500 nanoseconds (+/-62. I have ensured that this is the only task with priority 1. For delays longer than a few thousand microseconds, you should use delay () instead. Code that executes faster can also have other positive effects, e. Using "delayMicroseconds ()", that delay can be specified with microsecond resolution. So if your requirement is only for a 20ms delay (without needing to do anything while waiting) it is possible to call ets_delay_us (20 * 1000); Thanks! I was doing the output toggle just to see that I was actually delaying. 13 us. timeout_us: timer timeout, in microseconds relative to the current moment . Among the functions available to it, the following can be highlighted: Scheduled execution every x milliseconds and even microseconds. 42 +/- 0. So in that module, we need exact delay of 10 and 40 microseconds of delay interval in some interval to update firmware into that module using one wire communication over GPIO pins. Code e. Also, you are potentially. More knowledgeable programmers usually avoid the use of delay () for timing of events longer than 10’s of milliseconds unless the Arduino sketch is very simple. Code: Select all 00000000 <delay_using_division>: 0: 004136 entry a1, 32 3: 000081 l32r a8, fffc0004 <delay_using_division+0xfffc0004> 6: a2a280 muluh a10, a2, a8 9: 41a3a0 srli a10, a10, 3 c: 000081 l32r a8, fffc000c <delay_using_division+0xfffc000c> f: 0008e0 callx8 a8 12:. System time can be kept by using either one or both of the hardware timers depending on the application’s purpose and accuracy requirements for. Secondly, the custom event handler which you've given your HTTP client ( _gets called for each relevant event in the HTTP download, so use that to see how long each step takes. I need accuracies of 1 ppm or better. Jan 18 at 15:22. Top. This sketch demonstrates how to scan WiFi networks. Are you using the Arduino platform for ESP32 development? If so, I think `delayMicroseconds()` is available. Therefore if you set a tick period of 2ms (500hz) and request a delay of 1 tick you will get a delay of between just over 0 ms (if the request to delay. After getting the code to work on the ESP32 with a few changes, I ran a speed test again, and got the same 80ms. us – Number of microseconds to pause . Actually, we have connected one module over UART with ESP32 chip in our product. These values are in microseconds when the timer reach a_value do something. e 1 MHz. フーリエ変換(FT:Fourier Transform) は時間変化する信号を周波数毎に信号分離する技術です。If there is still problem, you can try these: Disable Ethernet by using Ethernet CS/SS whenever accessing SPIFFS. I have ESP32 connected to TZT servo SG90. When you connect an ESP32 to an External Source and have to shared Power or GND , this issue appears. Initialization. So not just an ESP32 issue. In this guide, we will show you how to use FreeRTOS timers and delays using ESP32 and ESP-IDF. delay(60000); // 1 minute = 60x1000 = 60,000 milliseconds. Neopixels have great possibilties. millis() On the other hand, it returns the number of milliseconds elapsed since the program started. The argument of the initialize() function sets the length of time before the interrupt is triggered, in microseconds. When ı create a task using xTaskCreate() function and adding some delay in the task function. I dont get any delay even if I add some different delays. After successful setup the timer will automatically start. I’ve updated my delay library to support milliseconds and microseconds delays. For this, we’ll use the timer’s equation above, Given that the default APB_CLK is 80MHz or 80,000,000Hz. millis() ¶. Hi everyone, I would like to measure a pulse duration of 32us (4 clock cycles at 125kHz). Currently, the largest value that will produce an accurate delay is 16383. EDIT 2:. 931] ets Jul 29 2019 12:21:46 [2022-01-20 10:45:27. When ı create a task using xTaskCreate() function and adding some delay in the task function. If it is used for a timer interrupt, the delay can extend till the execution of the interrupt service routine is finished. Then, we will examine timers available in ESP8266 and ESP32. I measured the delay like this: Code:. Code: Select all. // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH. Most of the time, the measurement shows 14us (1170 cpu cycles at 80mhz). I have disabled all interrupts. Let me know if anyone has any idea for that. delay (1000) - means delay of 1 sec. timer = Timer (period=5000, mode=Timer. (Updated at 01/04/2023) The sensor HC-SR04 allows measurement distances to an obstacle based on ultrasonic waves. I can not understand what this delay depends on. 5us delay when ESP works at 80MHz. Optional: detach interrupt. NTP. Re: small numbers of µS delays. g. This is the inverse function of localtime (). This could change in future Arduino releases. You say "2 and 8 µS, or even more, is OK. When ı create a task using xTaskCreate() function and adding some delay in the task function. This means that we can control the stepper motor with just 2 pins from our controller, or one for controlling the rotation direction and the other for controlling the steps. Just #include "analogWrite. Hi, I have several tasks in freeRTOS on my ESP32 delaying with the vTaskDelay-function. Milliseconds based delay is done using systick timer which makes interrupts every 1ms generated by HAL library. I dont get any delay even if I add some different delays. Hi! I need to synchronize 4 esp 32s with an accuracy of 20 microseconds. Top. Most modern. esp_timer set of APIs provides one-shot and periodic timer s, microsecond time resolution, and 64-bit range. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. The duration of this pulse is proportional to the. Internally, esp_timer uses a 64-bit hardware timer. kolban Posts: 1683 Joined: Mon Nov 16, 2015 4:43 pm Location: Texas, USA. All without using the delayMicroseconds() function. ESP32 with A4988 and stepper motor connection diagram. How the code works: The first step is to include the library with #include . Then we select the prescaler to apply to the timer clock signal. ESP_OK on. Serial communication that appears. ESP32-DevKi…. cpp 📋 Copy to clipboard ⇓ Download. This is all very helpful stuff for your projects. microseconds micros : 10814 HPtimer = 10814 --> 10000 calls of micros() on core 1 (500µs longer) but value measured by the two functions give the same result microseconds micros core0 : 10835 microseconds HighPrecTimer: 10216 microseconds HighPrecTimer core0: 10504 microseconds micros : 10795 HPtimer = 10795. Otherwise the sleep can last indefinitely. After that, a simple example will show you how to use ESP-IDF (Espressif IoT Development Framework) for menu configuration, then for building and flashing firmware onto an ESP32 board. If your application requires that you constantly. ’. The VCC and GND pins of the Waterproof ultrasonic sensor are connected to the ESP32 3. Its argument is the struct_time or full 9-tuple (since the dst flag is needed; use -1 as the dst flag if it is unknown) which expresses the time in local time, not UTC. Arduino example sketch "Blink" allows you to specify "delay ()" between state. //gpio to use to trigger delay const. The wiring is done as shown with 2 exceptions. They never yield the processor. Introduction. 2. Timer should not be running when this function is called. See the full code below. Hi, I'm following the sntp example to get the unix timestamp but. Postby fly135 » Fri Oct 05, 2018 5:10 pm. Syntax – delay (ms) delay function takes only one argument, Which will be the amount of time we have to pause the code. There are a thousand microseconds in a millisecond and a million microseconds in a second. Example run (the last value is delay in usec, which should be 14, but it's more): I (4895) main: 7:2304(28) I (7472) main:. First of all, set the clock source as internal clock. For a normal Arduino @16MHz only the following code will be compiled: /* Delay for the given number of microseconds. Device Control. This will open a Preferences dialog box. You may replace all delay with this function. We have 10 and 40 microseconds delay requirement for our application development purpose. I would use the ESP32's micro cycle count which can handle count in microseconds up to 207 years. begin(9600); } void loop() {. getCycleCount () function and interrupts for the timing. Timer callbacks can be dispatched by two methods:Other than the last point, this is trivial to do entirely within a basic Home Assistant automation. If time_ms is specified then this will be the maximum time in milliseconds that the sleep will last for. Problem is, I cannot start them from outside before the time is over. The delay function pauses the execution of your sketch for the duration of the delay. Finally, we will use the aforementioned concepts to design an ESP8266 ticker. After that, you can use vTaskDelay (. Regards, Ritesh Prajapati. So, I note that the vTaskDelay in the arduino does a delay of 15ms because of the Watchdog timer, this is the piece of code that says it. Dimming Neopixels, Delays<Microseconds. Home; Quick links. FreeRTOS delay in microseconds. ⚡ESP32 Code Example For The Servo Motor Project. FAQs About The ESP32 And. This number will overflow (go back to zero), after approximately 70 minutes. kolban Posts: 1683 Joined: Mon Nov 16, 2015 4:43 pm Location: Texas, USA. unless delay actually calls vTaskDelay on esp32, which it does. Note that it’s 72-1, because the prescaler will add 1 to any. Also delayMicroseconds() is a possibility. Accuaracy problem with internal ADC in esp32. Otherwise delay might be even few days (depends on higher priority tasks. g. 4 posts • Page 1 of 1. 1483×910 93. So, Normal communication with that module using ESP32 is UART but. In the interrupt handler itself I only set a variable that causes the execution of a function in the loop. Therefor, I read a lot, especally about xSemaphoreGiveFromISR which seems to be the most efficiant way to deal with this problem. They are all 64-bit (54-bit for ESP32-C3) generic timers based on 16-bit pre-scalers and. You are calling delay(2) which delays for 2 milliseconds which is longer than an ISR is allowed to block (300 microseconds by default).