Improving Overall Speed. tool-dfuutil-arduinoGPIO interrupt configuration flags. Generic Proximity Sensor Sample. But upon looking at the esp32 documentation for timer callback: "ESP_TIMER_TASK. Follow 3 min read · Feb 8, 2022 1 A deep dive into the ESP32, the IDF and docs, hoping it can perform better. Home; Quick links. when a pulse is detected by one io, an spi transaction will be triggered. Is there a way (if possible code please) to improve it with some. When an interrupt occurs, the microcontroller will go through the following steps: The microcontroller will halt the current task and will store the address of the next instruction (Program Counter or PC) on the stack (lower byte first). Software interrupts are internal which occur in response to the execution of a software instruction. Interrupts sensitive to pin logical level take into account GPIO_ACTIVE_LOW flag. A driver can allocate an interrupt for a. At some time later (the latency) you then detect the new message in the queue. To do so we call the pinMode function, passing as argument the the number of the pin and the operating mode. the AC module is powered by the 3V3 regulator of the ESP32 dev board. Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . The Nano ESP32 features the ESP32-S3 system on a chip (SoC) from Espressif, which is embedded in the NORA-W106 module. Post by MiguelMagno » Mon Aug 21, 2023 10:31 pm . Espressif ESP32 Official Forum. void IRAM_ATTR isr_handler(void *ctrl) {. The objective of this esp32 arduino tutorial is to explain how to handle external interrupts using the ESP32 and the Arduino core. And sei() function is similar to interrupts() function. The ESP32 SPI slave peripherals are designed as general purpose Devices controlled by a CPU. Therefore, there is a lower limit to the timeout value of one-shot esp_timer. Espressif ESP32 Official Forum. I'm using ESP32 Arduino IDE. Improving Overall Speed. In the interrupt handler itself I only set a variable that causes the execution of a function in the loop. Refer to “ESP32 practical power saving” for a detailed description on sleep mode. framework-espidf. I want to know if it is a normal behavior of F280049C operating at 100Mhz. A detailed ESP32-C3 datasheet is. Top. How can I minimize latency and execution time for interrupt ? I register interrupt as: Code: Select all. GPIO Interrupt Latency - once more. Normally, interrupts are written in C, but ESP-IDF. T2 gives us the exact number of CPU clocks between 1 PPS edges, which is an exact measure of its actual frequency. Steps 1 to 3 comprise the configuration stage. Surely that will do the trick. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. and at T=9. Then the timer sends a signal to either a display or LED and starts the counting again. These ESP32-C3 Hardware Timers, using Interrupt, still work even if other functions are blocking. Interrupt low Latency - again. This adds some latency to the interrupt which, if excessive, can lead to the interrupt missing its deadline. But when the interrupt latency is longer than the narrowest pulse from ledc the edge polarity detection fails and the output-pair is wrong. 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. tankist Posts: 5 Joined: Tue Feb 08, 2022 7:22 am. I would like to know the interrupt latency for an external pin interrupt in ESP32. ESP32-S3 GPIO interrupt latency is too high. esp32 GPIO interrupt latency. With Wifi *disabled*, I get a control loop latency of ~6ms . IRQ Startup latency. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. 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). The ESP32 has eight 16-Bit pulse count units, either for quadrature or single input decoders for reading quadrature encoded signals. On the ESP32, the Interrupt Allocation can route most interrupt sources to these interrupts via the interrupt mux. Post by jeromeh » Sun Feb 05, 2017 8:31 am . After that you get a cylcetime of ~300ns (disable interrupts for core 0). Without other libraries, on Teensy or Arduino (with the issue 776 fix), interrupt latency is about 3 to 4 µs. , the IWDT timeout period). Serial. 2 posts. An Operating system (OS) is nothing but a collection of system calls or functions which provides an interface between hardware and application programs. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. " The ESP32-C3 has one core, with 31 interrupts. Interrupt latency on the ESP32 is in the order of microseconds, unfortunately; there's a fair amount of prologue going on. I am seeing a similar issue as noted here:. Now I have found the time to do it for myself and with the ESP32 and some other platforms. The ESP-IDF OS supports pinning tasks to cores, which means that you assign one of the cores to run a particular task. We can use any GPIO pin for interrupts. ESP32 -W5500 WebServer_ESP32_W5500 Library. 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. Home; Quick links. esp32 GPIO interrupt latency. The ESP32-S3 is connected to WiFi. I am seeing a similar issue as noted here:. 15. 1. IRQ Startup latency. There are no native software interrupts in Arduino UNO (Atmega328p) microcontroller. ESP32 Interrupt. Example Software. This library enables you to use Interrupt from Hardware Timers on an ESP32-C3-based board. 3 posts • Page 1 of 1. Enable some one-off interrupt, such as GPIO interrupt. mertkslkc May 30, 2021, 6:57pm 11. If an interrupt request fires while the program is running a critical section, the request is put on hold and serviced only when the critical section is done. Post by ESP_igrr » Mon Nov 07, 2016 11:36 am . ESP32 Interrupt Latency Measurement Interrupt Latency – is the time it takes the CPU to respond to a specific interrupt signal. The other running processes (on both processors) delay my normal C based interrupt (ESP_INTR_FLAG_LEVEL3) to make the detection vary by up to half a millisecond. Extra latency depends on a number of factors, such as the CPU frequency, single/dual core mode, whether or not frequency switch needs to be done. If you are not using FreeRTOS software timers, set that macro to 0. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. After having issues with interrupt latency I've checked an older thread where it's described that interrupt. 35uS, the master brings the line high. The usage of attachInterrupt () macro is as follows-. Quadrature Decoder Sensor. Therefore, there is a lower limit to the timeout value of one-shot esp_timer. 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. 4 radio for ZigBee and Thread. For some reason, the traceback for case C could not be decoded by EspExceptionDecoder. Post by FL0WL0W » Mon Sep 06, 2021 12:00 pm . Now I have found the time to do it for myself and with the ESP32 and some other platforms. This method is useful for some simple callbacks which aim for lower latency. Unfortunately, interrupts on the ESP32 are a bit more complex than on an AVR (mostly because we need to do a bunch more context switching things, as well as the need to figure out what interrupt is triggered. You can also test that your interrupt handler is running on core 1 by calling this from it. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. and at T=9. I am seeing a similar issue as noted here:. I am a retired electrical engineer who has spent the last 15 years of his career in software engineering for other people. unsigned char enable_effect= 1 (saturation and hue enable)+. The Nano ESP32 features the NORA-W106-10B stand alone radio module, embedding an ESP32-S3 series SoC as well as an embedded antenna. Now I have found the time to do it for myself and with the ESP32 and some other platforms. 5 posts • Page 1 of 1. Because. External Interrupt Latency. for (;;) { } } gcjr:Reading the registers/state of another core. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. Overview The ESP32-C3 has one core, with 31 interrupts. All transactions must be handled by the CPU, which means that the transfers and responses are not real-time, and there might be noticeable latency. Plus we need to define an instance of this static variable. Register; Logout; Contact us; Board index English Forum Explore General Discussion; Interrupt low Latency - again. Enabling power management features comes at the cost of increased interrupt latency. We set it to CHANGE to trigger the interrupt whenever the pin changes value – for example from HIGH to LOW or LOW to HIGH. 04 in a VirtualBox. 2 Interrupt Service Routine (ISR) Handling. 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. Hi guys, I am implementing an interrupt handler for reception of data through the UART of the ESP32. The following optimizations improve the execution of nearly all code, including boot times, throughput, latency, etc: Set CONFIG_ESPTOOLPY_FLASHFREQ to 80 MHz. The tests were performed on a DFRobot’s ESP-WROOM-32 device integrated in a ESP32 FireBeetle board. greetings sdk: IDF V4. 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. The loop works as follows: The ADC notifies the ESP32-S3 through an ALERT pin interrupt, the ISR sets a ready flag. Espressif ESP32 Official Forum. and at T=9. tankist Posts: 6 Joined: Tue Feb 08, 2022 7:22 am. Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. With two cores, wifi using core0 and my app and GIPO interrupts using core1 I expected the ESP32 to be able to respond consistently. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latency. 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. With ESP32, we can configure all the GPIO pins as hardware interrupt sources. Re: handling GPIO interrupts. The code is functional, but I can't work with. The software example below will simply show the count of times it has fired, in the Serial Monitor, and is configured to fire once per second. An esp32 can do the job but is overkill and will be adding a complexity you do not need when learning C. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. But the difference is speed as stated earlier. To learn more about interrupts with the ESP32, read the following tutorial: ESP32 Interrupts and Timers using Arduino IDE; Initialize Wi-Fi. Interrupt Latency is defined to be the time between the actual interrupt request ( IRQ) signal and the CPU starting to execute the first instruction of the ( ISR) interrupt handler function. In case of interrupts, when the flags or signals are received, they notify the controller that they need to be serviced. ESP_Sprite Posts: 8410 Joined: Thu Nov 26, 2015 4:08 am. 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. Thus to create an interrupt on a pin, you must : Assign a pin to detect the interrupt attachInterrupt () attachInterrupt(GPIOPin, function_ISR, Mode); With Mode , the detection mode can be LOW , HIGH , RISING , FALLING or CHANGE. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. Espressif ESP32 Official Forum. These ESP boards are. Yes, but for filling a beaker I doubt a few microseconds will matter. 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. Skip to content. The timer_u32() is an alternative for the esp_timer_get_time() function as described in Epressif Documentation. 4 GHz Wi-Fi and Bluetooth 5 (LE) with a long-range support. This is double the 40 MHz default value and doubles the speed at which code is loaded or executed from flash. Each interrupt has a programmable priority level. common task congifuration. An individual timer in a group should be identified with timer_idx_t. se » Wed Jun 16, 2021 9:17 am. The microcontroller will execute the higher priority interrupt first. ESP32 wake up. esp32 GPIO interrupt latency. jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Espressif ESP32 Official Forum. 3 or 5V power and ground. On the ESP32, the Interrupt Allocation can route most interrupt sources to these interrupts via the interrupt mux. MicroPython on other boards (e. Re: External Interrupt Latency. How about latency? Can I make interrupt to trigger more precisely (cca 1us delay would be fantastic)? Regards, Boris. The interrupt source is a GPIO that connects to pulse-per-second signal from a GPS module. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). I am seeing a similar issue as noted here:. Post by jeromeh » Sun Feb 05, 2017 8:31 am . This is double the 40 MHz default value and will double the speed at which code is loaded or executed from flash. Return. There isn't any other device on the bus so when the PIC16 has new data available it generates a 50us low pulse on the SCL line, the ESP32 detects this pulse and starts reading data. [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. I'm trying to implement a high level interrupt to reduce the interrupt latency and jitter. With ESP32, we can configure all the GPIO pins as hardware interrupt sources. Espressif ESP32 Official Forum. jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. 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. Raising the level, the interrupt handler can reduce the timer processing delay. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latencyWriting into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). The arduino IDE completely abstracts the linking, interrupt tables and all that. 4 (brighnes and contrast enable)+. External Interrupt Latency. I would like to know the interrupt latency for an external pin interrupt in ESP32. 35uS, the master brings the line high. As far as I know, ESP32 has no Schmitt trigger inputs, so what you get is the expected behaviour. 75xVDD. This library enables you to use Interrupt from Hardware Timers on an ESP32-C3-based board. These interrupts are defined as zero-latency interrupts. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software timers using millis() or micros(). The following optimizations improve the execution of nearly all code, including boot times, throughput, latency, etc: Set CONFIG_ESPTOOLPY_FLASHFREQ to 80 MHz. implement hard pin interrupts on the esp32 to enable faster response times; check for pending soft interrupts in sleep_us(); this would need to be done in a smart. Depending on the project at hand I switch between two development environments:. greetings sdk: IDF V4. I only have 1 interrupt setup to trigger on any edge and I am seeing anywhere from 2us to. External Interrupt Latency. You're already stretching the limits of what the ESP32 can do, I'm surprised the plain polling approach works this fast. IRQ Startup latency. and wakeup latency. When the timer finishes. Minimum extra latency is 0. GPIO Interrupt Latency - once more. d98151a. If you want less, you'll have to learn/copy from. If you're seeing significantly higher latencies, consider skipping Arduino - I'm not sure that the GPIO library there is oriented for performance. Espressif ESP32 Official Forum. Extra latency depends on a number of factors, such as the CPU frequency, single/dual core mode, whether or not frequency switch needs to be done. Post by jeromeh » Sun Feb 05, 2017 8:31 am . Setting a bit and polling this bit in another task within an infinite. Through IO MUX, RTC IO MUX and the GPIO matrix, peripheral input signals can be from any IO pins, and. I write the interrupt handler in assemble and register the interrupt in app_main with priority level 5. The esp_intr_alloc () abstraction exists to hide all these. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. I'm detecting another delay related with the GPIO interrupts from ESP32. 2 posts • Page 1 of 1. Application Controlled Deferred Interrupt Handling Application controlled deferred interrupt handling is so called because each interrupt that uses this method executes in the context of a task created by the application writer. e. 4 GHz Wi-Fi® band as well as Bluetooth® 5. STM32 Interrupt Latency. , for low latency operations), set the ESP_INTR_FLAG_IRAM flag when the interrupt handler is registered. init (5); Thank you very much i was researching this problem for 2 days you saved me from a big mess. 1 was: "Some high-speed digital functions (Ethernet, SDIO, SPI, JTAG, UART) can bypass the GPIO Matrix for better high-frequency digital performance. But if they are happening simultaneously, then the one with the higher priority runs first and the lower priority gets queued. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Alternatively, it may be enough to run the gpio_install_isr_service call on a task that is pinned to CPU1. The program below measures ESP-32 interrupt delay. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. Steps to execute an interrupt in ESP32. Official development framework for ESP32 chip. static uint32_t lasthandshaketime; uint32_t. It’s a measure for the response time of an interrupt and it’s desired to be as small as. 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. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. 4, hd:ESP32-S3. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . But if they are happening simultaneously, then the one with the higher priority runs first and the lower priority gets queued. Espressif ESP32 Official Forum. Setting a bit and polling this bit in another task within an infinite. Re: Interrupt low Latency - again. Espressif ESP32 Official Forum. But this is only applicable if you are using some of the RF features such as Wi-Fi or BLE. The esp_intr_alloc abstraction exists to hide all these. The Full code Listing. 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. 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. 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. IRQ Startup latency. You must ensure that all data and functions accessed by these interrupt handlers, including the ones that handlers call, are located in IRAM or DRAM. Module Connections. esp32 GPIO interrupt latency. ESP-NOW is a kind of connectionless Wi-Fi communication protocol that is defined by Espressif. T2 gives us the exact number of CPU clocks between 1 PPS edges, which is an exact measure of its actual frequency. The ESP32-S3 is based on an Xtensa® LX7 series microprocessor. The third argument is the mode. Re: External Interrupt Latency. #define configUSE_TIMERS 1. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . Two main reasons: Interrupt Latency. This is required to latch the data into the DAC registers with the CS line. The wording they used in "ESP32 Technical Reference manual", Chapter 5. 11:42 am. I'm detecting another delay related with the GPIO interrupts from ESP32. The operating system switches task base on priority. At its heart, there's a dual-core or single-core. I have no idea what the latency would be without. Choose the board, COM port, hold down the BOOT button, click upload and keep your finger on the BOOT button pressed. After having issues with interrupt latency I've checked an older thread where it's described that interrupt latency with C is around 2us. 5 posts • Page 1 of 1. Post by go4retro » Thu Jan 10, 2019 6:26 am . 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. We’ll use the timer compare match interrupts (COMPA & COMPB) at the same time. Interrupt handlers - also known as interrupt service routines (ISR’s) - are defined as callback functions. esp32 GPIO interrupt latency. This is double the 40 MHz default value and doubles the speed at which code is loaded or executed from flash. ESP32-C3 is a single-core, 32-bit, RISC-V-based MCU with 400KB of SRAM, which is capable of running at 160MHz. Espressif ESP32 Official Forum. It also supports tasks having “no affinity,” which means the task can run on either core. IRQ Startup latency. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. 35uS, the master brings the line high. Without seeing and debugging the full code it's hard to tell what the problem might be. On suitable hardware MicroPython offers the ability to write interrupt handlers in Python. Reduce external interrupt latency. NORA-W106 (ESP32-S3) NORA-W106 module. The ESP32 has two cores, with 32 interrupts each. Core 0 is known as the “Protocol Core” or “PRO CPU. greetings sdk: IDF V4. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Now I have found the time to do it for myself and with the ESP32 and some other platforms. 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. Imagine now that we have an interrupt being fired when the signal goes low to high. Arduino Interrupts Latency & Response Time. GPIO Interrupt Latency - once more. But I'd guess that it is impossible to read. greetings sdk: IDF V4. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). An OS typically provides multitasking, synchronization, Interrupt and Event Handling, Input/ Output, Inter. Home; Quick links. Here you could see that the interrupt latency is almost 1usec and the ISR execution time is 2. After having issues with interrupt latency I've checked an older thread where it's described that interrupt latency with C is around 2us. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latency. Circuit. Maximum voltage for low input is 0. A event handler is registered and can be called correctly, but the. 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. 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. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. Creating and starting a timer, and dispatching the callback takes some time. None of them is induced by the abort in your modified esp_timer_impl_set_alarm code. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. I am seeing a similar issue as noted here:. This routine initializes an interrupt handler for an IRQ. Furthermore, we attach the rising edge triggered interrupt to this GPIO pin. 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. 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). Code: Select all mcpwm_isr_register(MCPWM_UNIT_0, isr_handler, NULL, ESP_INTR_FLAG_IRAM, NULL); Do you need speedy reactions and simple coding? Then, interrupts are a good thing to use. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. The following optimizations will improve the execution of nearly all code - including boot times, throughput, latency, etc: Set CONFIG_ESPTOOLPY_FLASHFREQ to 80 MHz. ) This means interrupt latency is about 2uS, which means that at 1MHz, the first interrupt isn't finished yet. 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. So we can make switchChanged static. Create the function that will be executed when. Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. The kernel addresses such use-cases by allowing interrupts with critical latency constraints to execute at a priority level that cannot be blocked by interrupt locking. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). ESP32 GPIO Interrupts. Extra latency depends on a number of factors, such as the CPU frequency, single/dual core mode, whether or not frequency switch needs to be done. The ESP32-S3 has two cores, with 32 interrupts each. 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. 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. The salesman goes from door to door while requesting to buy a. esp32 GPIO interrupt latency. 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 tankist » Thu Feb 10, 2022 7:08 am . I wonder if anyone has by any chance measured the pin-to-pin latency for a minimal interrupt handler (e. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Need help on High-Level Interrupts. I would like to know the interrupt latency for an external pin interrupt in ESP32. LAC timer is used for ESP32. Espressif ESP32 Official Forum. Espressif ESP32 Official Forum. Enabling power management features comes at the cost of increased interrupt latency. wdt. When the timer finishes counting down, the LED automatically turns off. 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. Use Interrupts - Triggering interrupts on specific communication events. 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. jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. Maximum voltage for low input is 0. Now I have found the time to do it for myself and with the ESP32 and some other platforms.