g. 2 (aditional saturation enable)+. 6. There are plenty of cases where low and consistent interrupt latency is important even when overall performance is not needed; an example would be building an AC dimmer using a zero-cross detector and a triac. Writing interrupt handlers. This is the reason critical sections should be kept as short as possible. Skip to content. attachInterrupt(GPIOPin, ISR, Mode); This function accepts three arguments: GPIOPin – sets the GPIO pin as the interrupt pin, which tells ESP32 which pin to monitor. Setting a bit and polling this bit in another task within an infinite. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. Post by go4retro » Thu Jan 10, 2019 6:26 am . Lately, I've been working on a project that consists of programming a Z80 with 8 address and data lines, the clock is done with ledc, it has two external interrupts on the Z80's WR and RD pins --> ESP32. As far as I know, ESP32 has no Schmitt trigger inputs, so what you get is the expected behaviour. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. If there was a very small interrupt <10 cycles, it probably wouldn't notice and would keep going, however, if I do 12 MBit USB, then, there is no timer, I'll simply be relying on the time it takes to execute every. ; ESP32: The ESP32. Alternatively, it may be enough to run the gpio_install_isr_service call on a task that is pinned to CPU1. Espressif ESP32 Official Forum. Overview The ESP32 has two cores, with 32 interrupts each. Arduino and ESP8266: The Arduino boards as well as the ESP8266 in general do not have an internal DAC and therefore you would have to build an DAC with external components. The 1 PPS signal is connected to a second timer (T2) that simply "captures" its value in a register and also triggers an interrupt, at which time we also take a snapshot of T1's value. 35uS, the master brings the line high. Re: himem page change delays isr. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. The cores in the ESP32 are labeled “Core 0” and “Core 1. Top. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. But if they are happening simultaneously, then the one with the higher priority runs first and the lower priority gets queued. However, the IRQ pins (INTx and PCINT) pins can be used in output mode. I'm using ESP32 Arduino IDE. How about latency? Can I make interrupt to trigger more precisely (cca 1us delay would be fantastic)? Regards, Boris. Determining the maximum latency is *hard*, especially with unpredictable caches and interrupts. An ESP32 timer group should be identified using timer_group_t. If you can live with 2µs latency, move reaction code into the interrupt (got ~2µs this way, not always feasible, BTW). 15 posts Apparently the expected interrupt latency is around 2 us; alternatively you can write your own high level interrupt handlers in. The usage of attachInterrupt () macro is as follows-. Improving Overall Speed. The following libraries are used: /* Libraries */ // Include WiFi Library #include <WiFi. I use an ADPS-9960 for gesture control which triggers an external interrupt. bmakovecki Posts: 4 Joined: Fri Nov 03, 2017 9:20 pm. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. 5 posts • Page 1 of 1. Overview. The esp_intr_alloc () abstraction exists to hide all these implementation details. Writing to, and then subsequently reading from, the timer command queue adds an additional latency. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). The ISR handler should clear the interrupt source if it’s required (Some don’t need to be cleared like the SysTick). This library enables you to use Interrupt from Hardware Timers on an ESP32-C3-based board. ESP32 external interrupt latency Post by MiguelMagno » Mon Aug 21, 2023 10:31 pm Lately, I've been working on a project that consists of programming a Z80 with 8 address and data lines, the clock is done with ledc, it has two external interrupts on the Z80's WR and RD pins --> ESP32. try Ethernet. When the Wifi is working the edge detection and the callback function execution is delayed. ESP32 interrupt latency is long and irregular #3894. ESP32 wake up. Re: External Interrupt Latency. Is there a way (if possible code please) to improve it with some. I am a retired electrical engineer who has spent the last 15 years of his career in software engineering for other people. These ESP boards are. ESP32 Interrupt. Hi guys, I am implementing an interrupt handler for reception of data through the UART of the ESP32. With wifi connected it tends to be on the higher side. None of them is induced by the abort in your modified esp_timer_impl_set_alarm code. It’s a measure for the response time of an interrupt and it’s desired to be as small as possible. But the difference is speed as stated earlier. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. 5 posts • Page 1 of 1. I write the interrupt handler in assemble and register the interrupt in app_main with priority level 5. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Because. You will likely get a result that an interrupt takes ~2 microseconds to execute. An individual timer in a group should be identified with timer_idx_t. But I'd guess that it is impossible to read. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). With Wifi *disabled*, I get a control loop latency of ~6ms . The arduino IDE completely abstracts the linking, interrupt tables and all that. In the interrupt handler itself I only set a variable that causes the execution of a function in the loop. The interrupt source is a GPIO that connects to pulse-per-second signal from a GPS module. 3 or 5V power and ground. The ESP32 SPI slave peripherals are designed as general purpose Devices controlled by a CPU. It manages the hardware resources of a computer and hosting applications that run on the computer. In this tutorial, we will learn to use ESP-MESH network using the painlessMesh library and ESP32/ESP8266 NodeMCU. Espressif ESP32 Official Forum. Ive measured the response by sending the same data I recieve through the TX output of the UART. We even have the NMI free, in theory, that should 100% guarantee you interrupt latency. 4. 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. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. GPIO Summary. I'm not entirely 100% sure if raw GPIO reads/writes are always latency-free. Re: Wifi Driver Receive Buffer Access/Interrupt. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). These ISRs are designed for performance-critical interrupt handling and do not go through common interrupt handling code. Module Connections. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Preparing Arduino IDE. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. For some reason, the traceback for case C could not be decoded by EspExceptionDecoder. Reduce external interrupt latency. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. within the loop, the WiFi connection just sits idle in the background. Espressif ESP32 Official Forum. BlueRetro being a universal adapter with auto-detect at run time it's not possible to compile two versions. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Re: Comment about low-latency interrupts #52669. Now, if we use a timer, we can use a callback function to get triggered every interval. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. Connect I2C SCL and SDA lines to the same on the MCU. 5MBit USB, I use ccount to stay on track. If one needs a service or product, he goes to him and apprises him of his needs. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). Through oscillometer I found the interval between the pulse and spi cs signal was as much as 100~200 us, while this thread says the interrupt latency can be reduced to about 2 us. Re: ESP IDF get GPIO level at time of interrupt. The wording they used in "ESP32 Technical Reference manual", Chapter 5. The syntax looks like below. esp32 GPIO interrupt latency. Creating and starting a timer, and dispatching the callback takes some time. If the ISR for interrupt 0 is executing and interrupt 1 occurs, it will be held until interrupts are turned on again after I0 has finished. Use it with a scope or a logic analyser: 2700000 served interrupts/s greetings. At its heart, there's a dual-core or single-core. Surely that will do the trick. Recommended reading: ESP32 with BME280 Sensor using Arduino IDE (Pressure, Temperature, Humidity). Basic Performance Measurements ESP32 Interrupt Latency Measurement Interrupt Latency – is the time it takes the CPU to respond to a specific interrupt signal. I am seeing a similar issue as noted here:. ISR – is the name of the function that. Configuring and using interrupts in MicroPython on the ESP32 A basic skeleton script. The ESP32 has two I2C channels and any pin can be set as SDA or SCL. On the ESP32, the Interrupt Allocation can route most interrupt sources to these interrupts via the interrupt mux. jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. Interrupt Priorities See full list on microcontrollerslab. Re: ESP External Clock. Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. That's. tool-cmake. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). Interrupts sensitive to pin logical level take into account GPIO_ACTIVE_LOW flag. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. ). Post by mTron47 » Fri Jul 13, 2018 3:39 pm . One way to get around this is to write a high-level interrupt in assembly, but that is non-trivial and I don't know if the Arduino environment supports it. So far I got 3 additional cases with "Interrupt wdt timeout on CPU0" crashes. esp32 GPIO interrupt latency. 4 (brighnes and contrast enable)+. Re: External Interrupt Latency. h file allows an application to use a read only timer for timing measurements done at and below 1 microsecond level. println ("Monitoring interrupts: "); Next, since we are going to be working with an external pin interrupt, we need to configure the previously declared pin number as an input pin. This adds some latency to the interrupt which, if excessive, can lead to the interrupt missing its deadline. Espressif ESP32 Official Forum. In the attached "interrupt. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latencyof increased interrupt latency. Now, the ESP32 is flashed with the new firmware. ISR inside a class as a static class function with static variables. One is to use the semaphore (s. I am seeing a similar issue as noted here:. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). The time between each pulse is anything. I seem to remember recent ESP-IDF versions have some allowances to also run C high-level interrupts, but I don't have the details on that. IRQ Startup latency. For Cortex-M3/M4, the whole latency this process takes is 12 cycles. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options. Maximum voltage for low input is 0. That means this GPIO pin will trigger the interrupt whenever it will sense rising edge on its input. We can enable interrupt on any of these GPIO pins by. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. 15 postsWriting into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Interrupt handlers - also known as interrupt service routines (ISR’s) - are defined as callback functions. ESP_igrr Posts: 1969 Joined: Tue Dec 01, 2015 8:37 am. The esp_intr_alloc abstraction exists to hide all these. 2 posts • Page 1 of 1. That needs 2 µs latency to start the waiting task RTOS_2 in core 0. You need to make sure it's already there. Post by jeromeh » Sun Feb 05, 2017 8:31 am . cases. 5 posts • Page 1 of 1. 2 posts. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options. Post by go4retro » Thu Jan 10, 2019 6:26 am . Do you need speedy reactions and simple coding? Then, interrupts are a good thing to use. A detailed ESP32-C3 datasheet is. ESP32 external interrupt latency. I would like to know the interrupt latency for an external pin interrupt in ESP32. SHT3XD: High accuracy digital I2C humidity sensor. External Interrupt Latency. An stm32 is "worse" in a sense that you can easily use the arduino IDE to work with esp32, but it is different with stm chips. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. When the Arduino IDE starts sending the code, you can release the button and wait for the flashing process to be completed. Here is a skeleton code, to trigger an interrupt via an external signal on your ESP32 board with MicroPython :. Post by go4retro » Thu Jan 10, 2019 6:26 am . Available now!Ever since I finished working on the latency tests & improvement, I've been working on trying to free up the 2nd core from its FreeRTOS duty by running it bare metal as originally demonstrated by @Daniel with #Bare metal second core on ESP32. BTW, for the goal you're aiming for (measuring pulse durations), timers in GPIO ISRs are not the best solution on the ESP32 (mostly due to interrupt latency : the ESP32 CPU is a lot more complex than simple 8-bit micros). Is there a way (if possible code please) to improve it with some. g. Now I have found the time to do it for myself and with the ESP32 and some other platforms. At first, I thought the I2C was hanging in the ESP32 but I can see that the problem. Internally, esp_timer uses a 64-bit hardware timer, where the implementation depends on the target. The code is functional, but I can't work with. How to put in light sleep ESP32. Espressif ESP32 Official Forum. The objective of this esp32 arduino tutorial is to explain how to handle external interrupts using the ESP32 and the Arduino core. and at T=9. 15. 4, hd:ESP32-S3 when a pulse is detected by one io, an spi transaction will be triggered. ) What you may be running into is that when himem. The Nano ESP32 features the ESP32-S3 system on a chip (SoC) from Espressif, which is embedded in the NORA-W106 module. Home; Quick links. and wakeup latency. #define configUSE_TIMERS 1. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. If you are not using FreeRTOS software timers, set that macro to 0. According to the fe310-g002 manual, the interrupt latency of the core is 4 cycles from receiving the interrupt and including the fetch of the first instruction of the handler. NORA-W106 (ESP32-S3) NORA-W106 module. On a congested wireless channel (meaning lots of other devices broadcasting) you'd routinely see 100+ ms latencies as your devices have to wait for a free radio slot. But technically the edge detection inside the CPU stores the values in a register somewhere and compares them to figure out if an edge occured between cycles. Perhaps those functions are executed very often, or have to meet some application requirements for latency or throughput. sdk: IDF V4. I can not figure out how to remove buffer or increase size to as close as possible real time transmission. println("1") function. 4 GHz Wi-Fi and Bluetooth 5 (LE) with a long-range support. But anyway, we know for sure that the dedicated external interrupt pins. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). Once Wifi is enabled, the latency can be a couple of. Espressif ESP32 Official Forum. The most common types of IRQ pins are dedicated external interrupt pins and IOC (interrupt-on-change) pins. Enable some one-off interrupt, such as GPIO interrupt. I have one task at each core. Use vTaskSuspend () at the start of the loop to have the task wait till it's woken up. I'm using the following code: Code: Select all. Interrupt latency on the ESP32 is a little higher than ESP8266, although there are also a lot of other variables which can effect interrupt timing. Reading the registers/state of another core. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . bmakovecki Posts: 4 Joined: Fri Nov 03, 2017 9:20 pm. T2 gives us the exact number of CPU clocks between 1 PPS edges, which is an exact measure of its actual frequency. Each interrupt’s priority is independently programmable. As an example, we’ll detect motion using a PIR motion sensor: when motion is detected, the ESP8266 starts a timer and turns an LED on for a predefined number of seconds. I explain it better, physically the edge of the signal and the callback execution has a delay of 200us between them. As shown on the oscilloscope screenshot below, why is the interrupt triggered twice ? The issue is the same if I use different GPIO pins for the interrupt and gate. GPIO Interrupt Latency - once more. Since core 0 is already used for those tasks, it is always best to use the second core 1. IRQ Startup latency. A event handler is registered and can be called correctly, but the. I'm trying to implement a high level interrupt to reduce the interrupt latency and jitter. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options. The objective is to allow the Arduino to continue doing what it was doing before the interrupt. 04 in a VirtualBox. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. Espressif ESP32 Official Forum. Skip to content. Timer callbacks are dispatched from a high-priority esp_timer task. I am seeing a similar issue as noted here:. The ESP32-S2 has one core, with 32 interrupts. At some time later (the latency) you then detect the new message in the queue. The Xtensa architecture supports 32 interrupts, divided over 7 priority levels from level 1 to 7, with level 7 being an non-maskable interrupt (NMI), plus an assortment of exceptions. As the clock is directly on the bus, the speed of the ESP32 is critical - and more importantly - how quick can the ESP32 get an interrupt and store the address latch and then serve the data. Post by jeromeh » Sun Feb 05, 2017 8:31 am . I wonder if anyone has by any chance measured the pin-to-pin latency for a minimal interrupt handler (e. Initialize a 'direct' interrupt handler. Circuit. esp32 GPIO interrupt latency. The ESP32 has two cores, with 32 interrupts each. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. g. As most of the base stuff runs on CPU0, CPU1 has fewer things to mess with the latency. With Wifi *disabled*, I get a control loop latency of ~6ms . Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. Now I have found the time to do it for myself and with the ESP32 and some other platforms. Re: External Interrupt Latency. 04 in a VirtualBox. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. IRQ Startup latency. Normally, interrupts are written in C, but ESP-IDF allows high-priority interrupts to be written in assembly as well, resulting in very low interrupt latencies. [中文] The Xtensa architecture supports 32 interrupts, divided over 7 priority levels from level 1 to 7, with level 7 being an non-maskable interrupt (NMI), plus an assortment of exceptions. Re: External Interrupt Latency. Re: External Interrupt Latency. and at T=9. 1 was: "Some high-speed digital functions (Ethernet, SDIO, SPI, JTAG, UART) can bypass the GPIO Matrix for better high-frequency digital performance. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options. LAC timer is used for ESP32. I highly recommend reading the project logs for more detail. This is useful for interrupts which need a guaranteed minimum execution latency, as flash write and erase operations can be slow (erases can take tens or hundreds of milliseconds to. 4, hd:ESP32-S3 when a pulse is detected by one io, an spi transaction will be triggered. Re: ESP32-S3 GPIO interrupt latency is too high Post by ESP_Sprite » Fri Feb 11, 2022 3:42 am You could look into the dedicated GPIO module; from what I know the interrupts of those are a bit faster. An esp32 can do the job but is overkill and will be adding a complexity you do not need when learning C. 2 posts • Page 1 of 1. and at T=9. 2. Timer callbacks are dispatched directly from the timer interrupt handler. esp32 GPIO interrupt latency. The setup code We will start by declaring the pin where the interrupt will be attached on a global. Because there are more interrupt sources than. . The ESP32 has eight 16-Bit pulse count units, either for quadrature or single input decoders for reading quadrature encoded signals. ESP-IDF is useless if you require things like consistent interrupt. 4, hd:ESP32-S3 when a pulse is detected by one io, an spi transaction will be triggered. , for low latency operations), set the ESP_INTR_FLAG_IRAM flag when the interrupt handler is registered. Install Drivers - Allocating ESP32’s resources for the UART driver. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). The operating voltage of this SoC is 3. WiFive. 35uS, the master brings the line high. Skip to content. STM32 ESP32 ARDUINO PIC Electronics. void taskthingy ( void *pvparemeters ) { //assign interrupt here and interrupt will go onto the core the task has been assigned to. The connections to the module are straightforward. 5 posts • Page 1 of 1. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Skip to content. 35uS, the master brings the line high. 6. If assigning the interrupt in a task. Register; Logout; Contact us; Board index English Forum Explore General Discussion; Interrupt low Latency - again. o. For this tutorial we’ll program the ESP32 using the Arduino core. and at T=9. ESP32 external interrupt latency. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. Alternatively, it may be enough to run the gpio_install_isr_service call on a task that is pinned to CPU1. Espressif ESP32 Official Forum. ESP32-C3 features four predefined power modes that not only enable developers to fulfill the requirements of various IoT application scenar- ios but also pass rigorous power consumption. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . Interrupt low Latency - again. I am seeing a similar issue as noted here:. sdk: IDF V4. For interrupt handlers which need to execute when the cache is disabled (e. Home; Quick links. A event handler is registered and can be called correctly, but the interrupt latency seems pretty unpridictable. I seem to remember recent ESP-IDF versions have some allowances to also run C high-level interrupts, but I don't have the details on that. Maximum extra latency is 40 us (when frequency scaling is. Not the stm IDEs. I'm using the following code: Code: Select all. The latency and jitter you can expect from a connection to an ESP32 depends heavily on the availability of free WiFi ether on the chosen channel. Through oscillometer I found the interval between the pulse and spi cs signal was as much as 100~200 us, while this thread says the interrupt latency can be reduced to about 2 us. I would like to know the interrupt latency for an external pin interrupt in ESP32. Step2: Choose The Target MCU & Double-Click Its Name. I think there has been a little bit of progress, although not specifically for this purpose: the GPIO drivers have been optimized a bit so if you use the ESP-IDF API, your interrupt latency should be a bit lower (but not as low as using the bare metal), and ESP-IDF now allows you to have high-prio assembly. Interrupt low Latency - again. Calling a C function from an interrupt requires the CPU's context to be saved, and the call stack to be switch to that of the C ISR. You might want to consider looking at the RMT ("Remote Control") peripheral, which is designed for actually this. 04 in a VirtualBox. h: 1. GPIO Interrupt Latency - once more. MicroPython on other boards (e. Pyboard) achieve much lower interrupt latency (few us) but prohibit memory allocation in interrupt handlers. The ESP32-S3 has a dual-core microprocessor Xtensa® 32-bit LX7, and has support for the 2. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. Core 0 is known as the “Protocol Core” or “PRO CPU. Interrupt low Latency - again. esp32 GPIO interrupt latency. One way to get around this is to write a high-level interrupt in assembly, but that is non-trivial and I don't know if the Arduino environment supports it. I wonder if anyone has by any chance measured the pin-to-pin latency for a minimal interrupt handler (e. The code in loop is simply to output to the user, and like with External Interrupts, loop can simply inspect the interrupts flag, and perform an action based on this as needed. ESP_igrr Posts: 1969 Joined: Tue Dec 01, 2015 8:37 am. Don't expect any miracles (and especially not 10-20ns); because of the Xtensa architecture, handling interrupts in C is pretty costly. cases. 3 posts • Page 1 of 1. On the ESP32, the Interrupt Allocation can route most interrupt sources to these interrupts via the interrupt mux. After having issues with interrupt latency I've checked an older thread where it's described that interrupt latency with C is around 2us. I am seeing a similar issue as noted here:. I will focus on describing how to refactor a. Postby Xtensa2C » Sun May 31, 2020 9:56 am. We are using two external interrupts on the esp32, one interrupt is attached to core 1 (this is a high level interrupt on GPIO_NUM_35) and the other one is a low level interrupt which is tied to core 0 on GPIO_NUM_27. I'm detecting another delay related with the GPIO interrupts from ESP32. Espressif ESP32 Official Forum. High Priority Interrupts. These are executed in response to an event such as a timer trigger or a voltage change on a pin. and it should be PubSubClient client (net); 1 Like. Setting a bit and polling this bit in another task within an infinite loop is faster (2 us), but cannot be a real option, because this is waste of resources and prevents from deep sleep options.