Home; Quick links. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. Re: External Interrupt Latency. That needs 2 µs latency to start the waiting task RTOS_2 in core 0. I will focus on describing how to refactor a. GPIO Interrupt Latency - once more. However, IRQ latency is improved if late-arrival or tail-chaining has occurred. To solve this problem, you must activate the desired effect and this is done with the following command. The following lines connect the. Example: Turn on an LED when a push button is pressed. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. Creating and starting a timer, and dispatching the callback takes some time. Interrupt latency on the ESP32 is in the order of microseconds, unfortunately; there's a fair amount of prologue going on. If assigning the interrupt in a task. 4 radio for ZigBee and Thread. A event handler is registered and can be called correctly, but the. Each interrupt has a programmable priority level. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. Jose Silva Posts: 1 Joined: Fri Mar 18, 2022 4:19 am. For some patterns, this latency has to be as short as possible and these are situations where it might be possible to process the request in the interrupt but those should be very, very rare. Is there a way (if possible code please) to improve it with some. What I need to to is reduce the latency between the initial. Register; Logout; Contact us; Board index English Forum Explore General Discussion; Interrupt low Latency - again. 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. BlueRetro being a universal adapter with auto-detect at run time it's not possible to compile two versions. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. greetings sdk: IDF V4. Use Interrupts - Triggering interrupts on specific communication events. After that you get a cylcetime of ~300ns (disable interrupts for core 0). Post by jeromeh » Sun Feb 05, 2017 8:31 am . wdt. Extra. The interrupt source is a GPIO that connects to pulse-per-second signal from a GPS module. 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. Espressif ESP32 Official Forum. FAQ; Forum. So we can make switchChanged static. I suspect the latency comes from the SDK, in the management of interrupt handlers. 75xVDD. A event handler is registered and can be called correctly, but the interrupt latency seems pretty unpridictable. 35uS, the master brings the line high. 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). But if they are happening simultaneously, then the one with the higher priority runs first and the lower priority gets queued. com Perhaps those functions are executed very often, or have to meet some application requirements for latency or throughput. esp32 GPIO interrupt latency. The code is generated with this tool and modified for our test project requirements. The setup code We will start by declaring the pin where the interrupt will be attached on a global. External Interrupt Latency. sdk: IDF V4. Through IO MUX, RTC IO MUX and the GPIO matrix, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any. This protocol lets numerous ESP boards communicate with each other over a large distance under a sole WLAN. 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 edigi32 » Tue Feb 26, 2019 9:57 am . I'm using the following code: Code: Select all. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. Arduino PCINT (Pin Change Interrupts) by Khaled Magdy. 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. (Accessing DRAM or other internal memory is fine; your data doesn't have to be in IRAM, just in internal RAM. 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. Steps to execute an interrupt in ESP32. On the ESP32-S3, the Interrupt Allocation can route most interrupt sources to these interrupts via the interrupt mux. In this last example project, we’ll test multiple Arduino Timer Interrupts. With Wifi *disabled*, I get a control loop latency of ~6ms . It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. 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. Espressif ESP32 Official Forum. Creating and starting a timer, and dispatching the callback takes some time. Step1: Open CubeMX & Create New Project. Improving Overall Speed. The ESP32-S2 has one core, with 32 interrupts. The objective of this esp32 arduino tutorial is to explain how to handle external interrupts using the ESP32 and the Arduino core. Skip to content. Post by jfmateos » Mon Nov 07, 2016 9:03 am . 04 in a VirtualBox. Top. I explain it better, physically the edge of the signal and the callback execution has a delay of 200us between them. try Ethernet. 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. Official development framework for ESP32 chip. I explain it better, physically the edge of the signal and the callback execution has a delay of 200us between them. For some reason, the traceback for case C could not be decoded by EspExceptionDecoder. and at T=9. Now I have found the time to do it for myself and with the ESP32 and some other platforms. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Pete. The esp_intr_alloc () abstraction exists to hide all these. We’ll cover how to publish to a single field and how to publish to multiple fields. ESP32-S3 GPIO interrupt latency is too high. 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. 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 interrupt handlers without having to copy-paste the ESP-IDF vector/startup code integrally. ESP_igrr Posts: 2066 Joined: Tue Dec 01, 2015 8:37 am. Assembler Routine for ESP32 / ISR. 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. void timerAttachInterruptArg (hw_timer_t. Basic Performance Measurements ESP32 Interrupt Latency Measurement Interrupt Latency – is the time it takes the CPU to respond to a specific interrupt signal. Espressif ESP32 Official Forum. When you called ETS_GPIO_INTR_ATTACH, it associated your GPIO interrupt handler with entry 4 in an. Home; Quick links. All I need is to grab the hardware timer value and store it. The objective is to allow the Arduino to continue doing what it was doing before the interrupt. esp32 GPIO interrupt latency. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). The PLIC adds another 3 cycles from an external interrupt source. Each interrupt has a programmable priority level. 15 posts Apparently the expected interrupt latency is around 2 us; alternatively you can write your own high level interrupt handlers in. GPIO Interrupt Latency - once more. Post by tankist » Thu Feb 10, 2022 7:08 am . greetings sdk: IDF V4. 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 jfmateos » Mon Nov 07, 2016 9:03 am . jeromeh Posts: 31 Joined: Thu Dec 22, 2016 5:41 am. 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. 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. Overview. print ("Current CPU core "); Serial. Yes, but for filling a beaker I doubt a few microseconds will matter. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . Interrupt low Latency - again. we are doing some stuff with an external RF transceiver and need to respond to its interrupts as fast as (technically) possible. 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. Each interrupt has a certain priority level, most (but not all) interrupts are connected to the interrupt mux. 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. When the Arduino IDE starts sending the code, you can release the button and wait for the flashing process to be completed. Don't expect any miracles (and especially not 10-20ns); because of the Xtensa architecture, handling interrupts in C is pretty costly. The program below measures ESP-32 interrupt delay. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latencyof increased interrupt latency. unsigned char enable_effect= 1 (saturation and hue enable)+. 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 . For example, a timer can be used to generate a. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Now I have found the time to do it for myself and with the ESP32 and some other platforms. 2 posts • Page 1 of 1. ) What you may be running into is that when himem. The connections to the module are straightforward. Interrupt low Latency - again. GPIO Summary. 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. 04 in a VirtualBox. ESP_igrr Posts: 1971 Joined: Tue Dec 01, 2015 8:37 am. What is the difference between hardware interrupt and software. Post by MiguelMagno » Mon Aug 21, 2023 10:31 pm . First, interrupt handlers need to be defined using the IRAM_ATTR attribute in order to ensure that they're already loaded into instruction memory (IRAM). How to improve interrupt latency with Arduino/C. 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. Espressif ESP32 Official Forum. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. I'm setting another GPIO pin to high when entering the event handler, and. h> // Include Serial Peripheral. Closed tannewt pushed a commit to tannewt/circuitpython that referenced this issue May 29, 2020. esp32: PRO CPU has been reset by WDT. " The ESP32-C3 has one core, with 31 interrupts. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. Minimum extra latency is 0. 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). Minimum extra latency is 0. An esp32 can do the job but is overkill and will be adding a complexity you do not need when learning C. The ESP32 SoCs contains from 2 to 4 hardware timers. Post by bmakovecki ». 115200 baud is possible. Refer to “ESP32 practical power saving” for a detailed description on sleep mode. I2C. Each interrupt’s priority is independently programmable. External Interrupt Latency. A high interrupt latency, however, may not be acceptable for certain low-latency use-cases. The down-side (of course) is that there is now a latency between when the interrupt occurs and when the interrupt is actually processed. 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 have done a measurement and delay from external trigger to application-provided ISR handler is around 2us (at 240MHz clock), which is around 500 cycles. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . 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. The interrupts can be sensitive to pin physical or logical level. 4, hd:ESP32-S3. A driver can allocate an interrupt for a. Post by go4retro » Thu Jan 10, 2019 6:26 am . After having issues with interrupt latency I've checked an older thread where it's described that interrupt. esp32 GPIO interrupt latency. begin. 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. In case of IRAM-safe interrupt you should use the HAL functions to read/write data from UART FIFO or directly read/write data to peripheral registers. On suitable hardware MicroPython offers the ability to write interrupt handlers in Python. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. 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 want to make a counter that can count the time between pulses in nanoseconds. A driver can allocate an interrupt for a. Using either the first or both pins with interrupts works very well. At first, I thought the I2C was hanging in the ESP32 but I can see that the problem. 04 in a VirtualBox. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. Post by jfmateos » Mon Nov 07, 2016 9:03 am . 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 is communicating with a PIC16 microcontroller through an I2C bus. The ESP32 has two cores, with 32 interrupts each. But if they are happening simultaneously, then the one with the higher priority runs first and the lower priority gets queued. and at T=9. I would like to know the interrupt latency for an external pin interrupt in ESP32. h> #include <HTTPClient. At 17uS, the esp32 responds to the event and sets an IO line to respond, which is too late. Then the timer sends a signal to either a display or LED and starts the counting again. After having issues with interrupt latency I've checked an older thread where it's described that interrupt. (186) boot. IRQ Startup latency. Each CPU has its own interrupt latency which is dictated by the. A event handler is registered and can be called correctly, but the. I'm detecting another delay related with the GPIO interrupts from ESP32. Re: Comment about low-latency interrupts #52669. MS5837 Sensor Sample. d98151a. T2 gives us the exact number of CPU clocks between 1 PPS edges, which is an exact measure of its actual frequency. A event handler is registered and can be called correctly, but the. 4, hd:ESP32-S3 when a pulse is detected by one io, an spi transaction will be triggered. An interrupt service routine should be as light as possible so that it can service an interrupt quickly. init (5); Thank you very much i was researching this problem for 2 days you saved me from a big mess. Maximum voltage for low input is 0. With ESP32, we can configure all the GPIO pins as hardware interrupt sources. When the timer finishes counting down, the LED automatically turns off. void taskthingy ( void *pvparemeters ) { //assign interrupt here and interrupt will go onto the core the task has been assigned to. Register; Logout; Contact us; Board index English Forum Explore General Discussion; Interrupt low Latency - again. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . After having issues with interrupt latency I've checked an older thread where it's described that interrupt. Re: ESP External Clock. 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. Espressif ESP32 Official Forum. Here is a skeleton code, to trigger an interrupt via an external signal on your ESP32 board with MicroPython :. 4 GHz Wi-Fi and Bluetooth 5 (LE) with a long-range support. Software interrupts are internal which occur in response to the execution of a software instruction. Resolution timer_u32 uses 80 MHz clock (in most. You'll squeeze a few fractions of a us out of interrupt driven DMA, but that requires assembly coding the interrupt handlers (low latency interrupts in ESP32 require dropping the C runtime altogether) and Arduino. Need help on High-Level Interrupts. 2 posts • Page 1 of 1. To use FreeRTOS timers, you have to turn them on with the following entry in FreeRTOSConfig. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Post by go4retro » Thu Jan 10, 2019 6:26 am . Overview The ESP32 has two cores, with 32 interrupts each. void IRAM_ATTR isr_handler(void *ctrl) {. 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. Post by ESP_igrr » Mon Nov 07, 2016 11:36 am . 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. This method will utilise the ESP32 memory directly inside a high-level interrupt. Run the following command at the end of all settings. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Postby jeromeh » Sun Feb 05, 2017 8:31 am. . The ESP32-S3 is based on an Xtensa® LX7 series microprocessor. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software timers using millis() or micros(). 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. when a pulse is detected by one io, an spi transaction will be triggered. Now, if we use a timer, we can use a callback function to get triggered every interval. when a pulse is detected by one io, an spi transaction will be triggered. To make the static function work, it can only access static variables. The difference is that dedicated external IRQ pins have separate interrupt vectors, while IRQ IOC pins share a common interrupt signal and you have to manually check which pin state has changed and caused that IOC global flag to. Re: External Interrupt Latency. The ESP32-S3 has two cores, with 32 interrupts each. Therefore, there is a lower limit to the timeout value of one-shot esp_timer. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. Connect I2C SCL and SDA lines to the same on the MCU. Minimum extra latency is 0. The Nano ESP32 features the NORA-W106-10B stand alone radio module, embedding an ESP32-S3 series SoC as well as an embedded antenna. 04 in a VirtualBox. ESP_igrr Posts: 1968 Joined: Tue Dec 01, 2015 8:37 am. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . After that you get a cylcetime of ~300ns (disable interrupts for core 0). 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). Measuring Performance The first step to improving something is to measure it. Context saving and restoration is a process that the CPU needs to do just to smoothly switch between main program execution and ISR handlers. 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. ). Post by mTron47 » Fri Jul 13, 2018 3:39 pm . Post by MiguelMagno » Mon Aug 21, 2023 10:31 pm . INUM_GPIO (4) is the index for a GPIO interrupt, and this bit will be set in INTERRUPT if a GPIO interrupt has occured. We even have the NMI free, in theory, that should 100% guarantee you interrupt latency. GPIO Interrupt Latency - once more. It also takes 26uS to process the IRQ body, though I am using QueueSendfromISR in the. 6. 2 posts. External Interrupt Latency. This process is generally time consuming (currently clocks in at approximately a few microseconds on the ESP32) and is not suited for High Level interrupts since they're meant. GPIO Summary. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latency. Example Software. Depending on the project at hand I switch between two development environments: either ESP-IDF, running under Eclipse on Ubuntu 18. This is double the 40 MHz default value and doubles the speed at which code is loaded or executed from flash. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latency. Reduce external interrupt latency. Board index English Forum Discussion Forum ESP-IDF; Reduce external interrupt latency Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). #define configUSE_TIMERS 1. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Two main reasons: 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. I'm using ESP32 Arduino IDE. 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. Maximum voltage for low input is 0. 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. 3 or 5V power and ground. Follow 3 min read · Feb 8, 2022 1 A deep dive into the ESP32, the IDF and docs, hoping it can perform better. 2 us (when the CPU frequency is 240 MHz and frequency scaling is not enabled). Top. It has 22 programmable GPIOs with support for ADC, SPI, UART, I2C, I2S, RMT, TWAI, and PWM. If you're seeing significantly higher latencies, consider skipping Arduino - I'm not sure that the GPIO library there is oriented for performance. Hi, I am having trouble with the external interrupt latency being very inconsistent. The interrupt source is a GPIO that connects to pulse-per-second signal from a GPS module. 4, hd:ESP32-S3 when a pulse is detected by one io, an spi transaction will be triggered. class myClass { static volatile bool switchChanged; // declare public: void begin () { pinMode (2, INPUT. 25VDD and the minimum voltage for the high input os 0. It manages the hardware resources of a computer and hosting applications that run on the computer. The Full code Listing. Post by jeromeh » Sun Feb 05, 2017 8:31 am . Home; Quick links. Put your current code from gpio_isr_handler () in a task in an infinite loop with a , start the task in app_main () and have gpio_isr_handler () just wake the task. Post by FL0WL0W » Mon Sep 06, 2021 12:00 pm . The esp_intr_alloc () abstraction exists to hide all these implementation details. Interrupt low Latency - again. The loop works as follows: The ADC notifies the ESP32-S3 through an ALERT pin interrupt, the ISR sets a ready flag. Post by go4retro » Thu Jan 10, 2019 6:26 am . Generic Proximity Sensor Sample. I have a strange problem with my ESP32 project. 1 was: "Some high-speed digital functions (Ethernet, SDIO, SPI, JTAG, UART) can bypass the GPIO Matrix for better high-frequency digital performance. I'm detecting another delay related with the GPIO interrupts from ESP32. INTENABLE & INTERRUPT gives the bitmask set of currently asserted and enabled interrupts. external interrupt jitter. ESP32 GPIO Interrupts. Module Connections. Use it with a scope or a logic analyser: 2700000 served interrupts/sgreetings. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. I can not figure out how to remove buffer or increase size to as close as possible real time transmission. As most of the base stuff runs on CPU0, CPU1 has fewer things to mess with the latency. The ESP32 has eight 16-Bit pulse count units, either for quadrature or single input decoders for reading quadrature encoded signals. Post by mTron47 » Fri Jul 13, 2018 3:39 pm . Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. Alternatively, it may be enough to run the gpio_install_isr_service call on a task that is pinned to CPU1. ESP_Sprite Posts: 8410 Joined: Thu Nov 26, 2015 4:08 am. I am seeing a similar issue as noted here:. 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. Home; Quick links. Internally, esp_timer uses a 64-bit hardware timer, where the implementation depends on the target. 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. Preparing Arduino IDE. Overview The ESP32-C3 has one core, with 31 interrupts. Basically interrupts are of two types: Software Interrupts: Fig 3 ESP32 software interrupt. A driver can allocate an interrupt for a. 04 in a VirtualBox. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). ESP-IDF is useless if you require things like consistent interrupt. If you want less, you'll have to learn/copy from. Preventing ISRs from running in a timely manner is undesirable as it can increase ISR latency, and also prevent task switching (as task switching is executed form an ISR). There are actually SEI & CLI assembly instructions in the instruction set of Arduino’s. greetings sdk: IDF V4. Both can work with approximately 1 bit time of interrupt latency from OTHER code. At some time later (the latency) you then detect the new message in the queue. The main issue here is the way the interrupt handler work by storing a table of the ISR function pointer for each core. Hi, I'm using a GPIO pin as a external interrupt, responding to negedge events. Post by go4retro » Thu Jan 10, 2019 6:26 am . RAM speeds are 150nS - so that was the target; for a modern 200Mhz dual core xtensa it should be no trouble. If one needs a service or product, he goes to him and apprises him of his needs. I have one task at each core. the AC module is powered by the 3V3 regulator of the ESP32 dev board. 2 posts • Page 1. I only have 1 interrupt setup to trigger on any edge and I am seeing anywhere from 2us to. "The ESP32-C3 has one core, with 31 interrupts. bmakovecki Posts: 4 Joined: Fri Nov 03, 2017 9:20 pm. Board index English Forum Discussion Forum ESP32 Arduino; How to improve interrupt latency with Arduino/C. sei(): Set interrupt global enable flag bit (re-enable interrupts after being disabled). 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. greetings sdk: IDF V4. So my next step is to call an interrupt in assembly which required to use ESP32's higher priority levels. Post by tankist » Thu Feb 10, 2022 7:08 am . Enabling power management features comes at the cost of increased interrupt latency.