BC OnLine Partnership Office E161, 4000 Seymour Place PO Box 9412, Stn Prov Govt Victoria, BC V8W 9V1void vTaskDelay (const TickType_t xTicksToDelay) ¶ Delay a task for a given number of ticks. Hi, I have to drive a stepper motor with my esp32, with a frequency that requires a delay below milliseconds (for example 100 microseconds). Pleased you solved the problem. This causes serious random issues with my tick count (For example, vTaskDelay of a second will take microseconds). 1. The tickless mode. while (true) { esp_timer_dump(stdout); vTaskDelay(pdMS_TO_TICKS(1000)); } Compiling the Sketch Hi, I have several tasks in freeRTOS on my ESP32 delaying with the vTaskDelay-function. What is the difference between Nano 328p-au and 328p-mu? 2. Prescaler divides the Timer clock further, by the value that you input in the prescaler. Such as vTaskDelay(1/portTICKPERIODMS) to get 1 milliseconds. It should work when the scheduler is running, just ensure to set the priority down before you call vTaskStartScheduler (). How to implement uS delay?Posted by at91kevin on June 1, 2009Hi all, Thanks for Open community. The Delay method is typically used to delay the operation of all or part of a task for a specified time interval. Se estiver utilizando a vTaskDelay, estará evidenciando em seu código a utilização dos recursos do. vTaskDelay (5000 / portTICK_PERIOD_MS);} but if i use: while (true); the interrupt is fired. task. Dig. int milli_seconds = 1000 * number_of_seconds; clock_t start_time = clock();ESP8266_RTOS_SDK library for DHT11, DHT22 or SI7021. Passing NULL will suspend. I have pinned one task to each core with infinite loops. Understanding the vTaskDelay help. ) Such as vTaskDelay(1/portTICKPERIODMS) to get 1 milliseconds. This sounds like an XY problem. Calling vTaskDelay(0) is equivalent to calling taskYIELD(). How can I do that with freertos or just what are the calculations (for delay). 2. g. 1 seconds before something happens. 125); does exactly what it says. Basic idea is to get current clock and add the required delay to that clock, till current clock is less than required clock run an empty loop. Porque vTaskDelay() es relativa: comienza a descontar el tiempo desde el momento en que es llamada, mientras que vTaskDelayUntil() es absoluta: descuenta el tiempo con respecto a un punto de referencia en el pasado. zazas321 Posts: 186 Joined: Mon Feb 01, 2021 9:41 am. {"payload":{"allShortcutsEnabled":false,"fileTree":{"util":{"items":[{"name":"DWT_Delay. sdk_os_delay_us () is better for very precise short delays, you can also surround such a call with vTaskEnterCritical / vTaskExitCritical to disable interrupts. The constant portTICK_RATE_MS can be used to calculate real time from the tick rate - with the resolution of one tick period. Hi all, I using FreeRTOS V9. The latest version of FreeRTOS came with the "tick". I encountered the same problem. As soon as you need to do a few things at the same time, you. 0. 我们大家都知道Task. Task switching is performed because the FreeRTOS vTaskDelay is used. Tasks: DelayTasks. Down at the very bottom you'll see two core task. I made a test PWM signal on a GPIO pin (50% duty) and connected it to input pin. Q&A for work. This function can be used by periodic tasks to ensure a constant execution frequency. FreeRTOS delay in microseconds. Top. THE TICK is a new Netflix show. The actual time delay may be up to one timer tick less than specified, i. 5nS, +/- interrupts/overhead/etc) or set up a timer to count exact clock cycles, and then convert to your preferred units at the user interface level. The ROM function ets_delay_us() (defined in rom/ets_sys. 0000041666666666667 ms per clock tick. So in this case I want to make the system to wait for 33 to 37 micro-seconds which is possible through vTaskDelay() if the configTICK_RATE_HZ is set to 1000000. So I know the stepper_task is not hanging. I have begun to interest in how FreeRTOS works, and because of I don't have my ESP32 yet, i decided to try it in my arduino micro. I am trying to break down the fundamental features of freeRTOS (e. Since the frequency of AVR's watchdog oscillator is voltage- and temperature-dependent, it isn't a good idea to use vTaskDelay for precise timing intervals. My code uses both cores of the ESP32 and seems to work well. Cooperative multitasking for Arduino, ESPx, STM32 and other microcontrollers. As HS2 have said, dynamically create tasks is not a good aproach. Currently, the largest value that will produce an accurate delay is 16383; larger values can produce an extremely short delay. delay () is a blocking function. The final part of section 2 shows how these building blocks and source code modules are used to achieve a context switch on the AVR microcontroller. The task above calculates how long the task took to execute and then performs vTaskDelay including the timestamp_difference. There are a thousand microseconds in a millisecond and a million microseconds in a second. Then when the task wakes up it could check the RTC and delay a little longer as needed. The FreeRTOS kernel is now an MIT licensed AWS open source project. Most of it is functions related to controlling a nextion screen via serial and stepper motors. davdav Posts: 207 Joined: Thu Nov 17, 2016 2:33 pm. Maybe because you can't generate delays or if there is a similar command what is it. 001 Seconds: 1000000 Microseconds = 1 Seconds: Embed this unit converter in your page or blog, by copying the following HTML code: convertliveRe: vTaskDelay. If you don't put something that blocks the fors(), same priority tasks that you created never get CPU. In a project with a single task whenever its priority is set to 0 the system runs as expected, but when its priority is set a value other than 0 (with configMAX_PRIORITIES set to 3) then the function vTaskDelayUntil() never returns. Timestamp of the nearest timer event, in microseconds. Best regards. Shizen February 21, 2023, 1:53am 5. A call to vTaskDelay will put your task to sleep (blocked from getting any CPU) for the number of FreeRTOS ticks specified. e 1 MHz. Assumes a 8 or 16 MHz clock. vTaskDelay(10); // Run delay taskENTER_CRITICAL();. Because the next SI prefix is. You really helped me out! But again, i have another question. Single-family homes make up a large proportion of the market, but Greater Victoria also has a number of high-end luxury properties. The FreeRTOS support forum can be used for active support both from Amazon Web Services and the community. where N is the required number of microseconds. 100 microseconds intervalPosted by maxciu on November 3, 2015Hi, I am a relatively new OpenRTOS user and so far I’m amazed by the possibilities it offer you when dealing with a larger embedded project. However, I've read that it’s best to avoid such high tick rates, due to the context switching delays. Not sure. task. 1 Answer. 5) . I have disabled all interrupts. This is the second part of a series of ESP-IDF tutorials that I will complete as I learn stuff. Post by zazas321 » Wed Mar 16, 2022 6:51 am . However, to answer your actual question, there is a more accurate alternative to delayMicroseconds (): the function _delay_us () from the AVR-libc is cycle-accurate and, for example. If not other tasks are in the ready state, it will default to running the IDLE task (IDLE0 or. If I use vTaskDelayUntil() along xTaskAbortDelay(), the program fails. Quality RTOS & Embedded Software About Contact Support FAQ Download. Sometime while the task is executing. I call vTaskDelay for various reasons. bvernoux completed on Oct 19, 2016. The esp32 has WiFi and ESP-NOW active at the same time, receiving some data from another esp32. 3 posts • Page 1 of 1. You can use vTaskDelay () in a timer callback but we advise not to as all software timers run in the context of the same task, so if you block that task no other timers will run. It’s also one of the worst things. This code calls vTaskDelay indirectly as it needs to wait for some milliseconds to allow for device initialization. 5 milliseconds. I believe both my timer task and the lwIP network task goes into a foreverloop in vTaskDelay. So, my question is, if I put a vTaskDelay (1) on my code. You do not have the required permissions to view the files attached to this post. vTaskDelay for 1uS, possible?Posted by willywortel on December 3, 2008First of all, thanks everyone for the response so far. Its symbol is μs, sometimes simplified to us when Unicode is not available. One microsecond contains 1000 nanoseconds. The parameter in vTaskDelay is the delay period in number of ticks from nowI'm totally new to programming and electronics, it would be very helpful if someone helped me figure this out. 文章浏览阅读1. Returns. I’m working on SAM7S64, FreeRTOS port. Next, let's look at an example showing the work and calculations that are involved in converting from microseconds to seconds (μs to s). This IR functionality needs a delay microseconds function in order to get built. My idea was to create a freeRTOS task for the stepper motor on core 0, so that core 1 can run WiFi ESP-NOW, but I have a hard time managing microseconds delay by doing so. The task above calculates how long the task took to execute and then performs vTaskDelay including the timestamp_difference. Hardware: Board: Lolin32 Core Installation version: d5fdd71 IDE name: IDF component Flash Frequency: 40Mhz PSRAM enabled: no Upload Speed: 115200 Computer OS: Windows 8. Have anybody a sample Project for PSoC4 and FreeRTOS I am wondering that is no Example availible?!yes, vTaskDelay also uses OSIF, so the root cause is still the same. Use a hardware timer, and interrupt. enthusiastsr November 18, 2021, 9:47am 1. Is it possible? or How to increse. Espressif ESP32 Official Forum. after deleting tasks, assign their task handles to NULL and call vTaskDelay ()If you use a software timer then, unlike a task, the timer callback function is ‘run to completion’, in that you start to execute from the top of the function and execute all the way to the end, and exit the function. Setting a software delay in your FreeRTOS tasks, that enables other waiting tasks to run. I made several tests, and anytime vTaskDelay is executing, the interrupt is lost, otherwise it work perfectly. Why do I need the vTaskDelay() in the TaskTransmit(). Check this link for more details. This is obvious as I need board to be initialized before creating tasks. Read part 1. Communication between ESP01 Arduino NANO and using External Interrupt in Arduino NANO for other than communication program same time. coretex-m4(STM32F407VG discovery) Questions about implementing vTaskDelay and DelayPosted by jonginkk on January 12, 2018Hello. Regards,. I am trying to use FreeRTOS's vTaskDelay () function in order to periodically execute tasks. So my configTICKRATEHZ is default -> (TickType_t) 1000) Can i implement in terms of FreeRTOS a delaymicrosecnods function? Freertos makes use of SysTickHandler. That is NOT a suitable application for something like vTaskDelay. especially if nested interrupts is all working as it should…’ that’s how I fire the firing pin at exactly the time it. ("MICROSECONDS","time in miliseconds=%lli",task_execution_start); // HERE BUNCH OF THINHS HAPPENING SUCH AS TOGGLING RELAYS, PRINTING. In this guide, we will show you how to use FreeRTOS timers and delays using ESP32 and ESP-IDF. A microsecond is a unit of time. Understanding the vTaskDelay help. void loop() { vTaskDelay (portMAX_DELAY); //OR vTaskDelete ( NULL ); } As for the watchdog thing, the simplest option would be to try adding a yield () (aka vTaskYield ()) where necessary. h> // define two tasks for Blink. What I was suggesting was using vTaskDelay to block for the longest time possible less than us, then using esp_timer_get_time to delay for the remaining time. Inside the context switch interrupt the traceTASK SWITCHED OUT () macro will get called before another task is selected to enter the running state – placing. Posted by. Tips, buy me a coffee, or three. Its always good in these cases if you can also post what the resolution was - that can be helpful to others with a similar issue in the future. After much struggling I found that vTaskSuspendAll (); and xTaskResumeAll (); works but only as long as no delays are used. After much struggling I found that vTaskSuspendAll (); and xTaskResumeAll (); works but only as long as no delays are used. I am following the tutorial and using the example code from (Control the Basic ESC with the Arduino Serial Monitor) but substituted the default servo library for ESP32_Servo library. delayMicroseconds() works in arduino. Also tried vTaskDelay(pdMS_TO_TICKS( 1000 )) but result is the same. vTaskDelay(0) vs vTaskDelay(1)Posted by niramas on December 24, 2012I just want to clairify that I understand what vTaskDelay(0) does vs vTaskDelay(1). 6w次，点赞9次，收藏32次。延时Delay就是交出CPU一段时间，如果任务一直不延时或者挂起，那么低优先级的任务会无法获得CPU。FreeRTOS延时的单位是tick，就是调度的基本单位（不是毫秒）vTaskDelay和vTaskDelayUntil都是延时函数，vTaskDelayUntil是精确延时函数原型void vTaskDelay( const TickType_t. Idahowalker:Understanding the vTaskDelay help. For measuring time, there's xTaskGetTickCount, but this will be limited to the resolution of your tick rate. The assert in vTaskDelay() checks to see if the uxSchedulerSuspended of the current core is set. If. 9 and 1. void vTaskDelay (const TickType_t xTicksToDelay) ¶ Delay a task for a given number of ticks. Have a nice day. Tickless microsecond delay before sleepPosted by cajjed on November 23, 2016I am using a samd21g18a and using the Atmel Software Framework with freeRTOS 9. For your website. Therefor, I read a lot, especally about xSemaphoreGiveFromISR which seems to be the most efficiant way to deal with this problem. If you want something faster you would need to use a peripheral timer. @Perehama and @gfvalvo I am using ESP32. Problem is, I cannot start them from outside before the time is over. c","path":"util/DWT_Delay. The. Down at the very bottom you'll see two core task assignments - one for the stepper loop, one for. FreeRTOS support forum archive - 100 microseconds interval. I am trying to measure the duty cycle interval (from falling to rising edge) in microseconds of an incoming PWM signal of 20 KHz. This is bad practice and can cause your ESP32 to enter Kernel panic and force restart. The delay will be variable depending on the temperature read from the printer head, and it vary around 1 millisecond. This function will print the list of active timers according to the format: timer name, period of timer and time of the next alarm since boot in microseconds. For this, we need to pass the handle of the tasks that needs to be suspended. There are loads of other discussion you can find if you search for ‘microseconds’ on these forums if you want even more opinions…but I’ll chip in here with mine. There are other tasks running in the background but they have priority 2 or higher. With the ESP32 running at 240Mhz it is 0. 1) Bug with IDF functions that internally call vTaskSuspendAll () The assert in vTaskDelay () checks to see if the uxSchedulerSuspended of the current core is set. Smart | Connected | Secure | Microchip TechnologyThen add the line: portYIELD FROM ISR ( pdTRUE ); after you set the flag to 1 in your ISR. See the RTOS Configuration documentation for more information. So with a 1ms period you have 1ms resolution. A comparison of the measurements of different ESP32 cards. The bug is only triggered if I activate another task, which initiates a client HTTP connection with a response timeout. For ESP-IDF, you can use this:ducalex commented Jul 11, 2019 •. vTaskDelay () itself does not feed the Task Watchdog. after xQueueGenericReceive()) In details, the TFTP listening task is: void TFTPserverlistening(void pArgs) { // Create a socket // Bind it to the desired port and. Hi all, I'm a new member. Removing the call woks fine. 100 microseconds interval. Re: vTaskDelay () vS. vTaskDelay() 并不会因此提供一种 控制周期性任务频率的好办法，因为途径代码的路径以及其他任务和中断活动将影响 vTaskDelay() 被调用的频率，进而会影响下一个任务执行的时间。 请参阅 vTaskDelayUntil()，了解为 便于任务以固定频率执行而设计的替代 API 函数。. FreeRTOS is a professional grade, small footprint, open source RTOS for microcontrollers. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"examples","path":"examples","contentType":"directory"},{"name":"include","path":"include. uxTaskGetSystemState() xTaskGetApplicationTaskTag(). Understanding the vTaskDelay help. vTaskDelay () is a non-blocking delay, it let's other threads to continue working. Note that millis() doses not advance every. Environment Development Kit: ESP8266 Wemos D1 mini Development Env: Make/Eclipse Operating System: Ubuntu Power Supply: USB Problem Description Hi, I need to create a NanoSecond delay. 3. Board). Something like: Something like: let end = us + unsafe { esp_timer_get_time ( ) } ; let ticks = us / ( portTICK_PERIOD_MS * 1000 ) ; if ticks > 0 { vTaskDelay ( ticks ) ; } while unsafe. What I saw is the before I complete the initialization of this toolkit the vTaskDelay function works. e 1 MHz. - Tasks running on device but which do not use vTaskDelay: xTaskCreate(uart_task, "uTsk", 3500, NULL, 11, &UART_TaskHandle); -> no vTaskDelay used xTaskCreate(GSM_uartTask, "UauxTsk", 4096, NULL, 11, &GSM_TaskHandle); ->. Interrupts could produce wrong timings, it could be useful to disable them until you finish to process the movement. The FreeRTOS kernel is now an MIT licensed AWS open source project. 1 Description: delay () doesn't work for periods smaller than one tic. Code: Select all. Tasks in the Blocked state allow other tasks to. The code simply reads an input on the serial port and returns it with some extra text. Returns. The ROM function ets_delay_us () (defined in rom/ets_sys. Note that millis() doses not advance every millisecond. We will use this interrupt to release a semaphore for DHT11 task to operate. Re: vTaskDelay. first Task tutorial where the vTaskDelay API was discussed. 0 and port files SourceportableRVDSARM_CM4F (imported via RTE Keil). . vTaskDelay . task only for 1000 or 2000 micro seconds. You should use vTaskDelaySofware interrupt. */ vToggleLED (); vTaskDelay ( xDelay ); } } FreeRTOS is an open source, small footprint RTOS for microcontrollers. We’ve also found instances where (10 / portTICK_PERIOD_MS) results in a delay of 100mS regardless of the value used! Even. g. Technique #4 – Use RTOS yield function. vTaskDelay () specifies a time at which the task wishes to unblock relative to the time at which vTaskDelay () is called. If you call vTaskDelay ( 1 ) then you are on the limit of the resolution and the period you delay for will depend on where in the current time slice the. 5 milliseconds. However, this crashes my ESP32 every time. . Note that it’s 72-1, because the prescaler will add 1 to any. I would like to understand how does vTaskDelay work exactly. The main caveat is that the argument has to be a compile-time constant. I. Stop thinking in microseconds, and think in "clock cycles" or "nanoseconds" instead. in most typical application. Posted by richardbarry on July 2, 2013. all these are correct?. The sdk for the chip needed 2msec. This will guarantee very precise timing except. calling osDelay (1) right before the next system tick occurs the. vTaskDelay () is supposed to allow a context switch. The function taskdelay () delays a task in terms of ticks. (acc @Clifford: ) They both are entirely different functions by different developers for different purposes. e. ESP-IDF timer delay. A typical method is to call vTaskNotifyGiveFromISR () to wake-up a task from within an ISR. THE TICK is a new Netflix show. Multiple Task SynronisationPosted by jdurand on November 19, 2012A couple of ways… You could create the new tasks inside task 1 when it’s […]I would not kill the first task when the second starts. Turned out that vTaskDelay (2/portTICK_PERIOD_MS) wasn't waiting long enough. g. Instead, the IDLE hook fires repeatedly. The actual time that the task remains blocked depends on the tick rate. vTaskDelay(500 / portTICK_RATE_MS); You can use vTaskDelay () even if not using FreeRTOS tasks. Arduino’s delay () semaphores are accessed only when available. However, during enumeration some USB hosts require a (small) response every 100uS. The questions that arose. The assertion failure you see is vTaskDelay() checking if it was called whilst the scheduler is disabled. Micro denotes a factor of one millionth (10-6) which means that there are 1,000,000 microseconds in a second. So, does this vTaskDelay have same issue with OSIF_TimeDelay. Have just done the test on an ESP32 ESP32 DoIt ESP32 Devkit V1 (80MHz) I/O Speed Tests Over 50000 Iterations. 10 Milliseconds = 10000 Microseconds. Sorry for my poor description. You could simply verify this by replacing the call to vTaskDelayUntil with vTaskDelay (Yes, I know it’s not the same but a lot of times it is ok…) I think Richard Barry should consider. The constant portTICK_PERIOD_MS can be used to calculate real time from the tick rate - with the resolution of one tick period. Shizen February 21, 2023, 1:53am 5. I have ensured that this is the only task with priority 1. Now I can use different vTaskDelay in the app_main function. It seems that sys tick handler blocks all interrupts and in result my timer does not work properly (I need microseconds precision). The vTaskDelay never return when it is call after a blocking operation (e. Hi i'm new to AVR assembly language so i was trying to get delay function to create 1 ms , 100us, and 1us delays to do that i need to figure out what to replace nop's with below here (mainboard arduino uno r3 ATmega328 Thank you. I tried to increase […]vTaskDelay for 1uS, possible?Posted by willywortel on December 3, 2008First of all, thanks everyone for the response so far. eg. One is to wait for a period after resetting a chip (BME280). I’ve been trying to use the function in a simple system containing a single task that calls this function in an infinite loop, and it causes permanent suspension of the scheduler via uxSchedulerSuspended in tasks. A microsecond is equal to 1000 nanoseconds or 1⁄1,000 of a millisecond. Prescaler divides the Timer clock further, by the value that you input in the prescaler. Hi, it's me again with more stupid questions. theskaz. If my kernel tick rate is set to 500 Hz does that mean that my 1 millisecond delay will be at. void vTaskDelayUntil ( TickType_t *pxPreviousWakeTime, const TickType_t xTimeIncrement ); INCLUDE_vTaskDelayUntil must be defined as 1 for this. Reply. c after I initialise the esp as Access. 0. suzuki four stroke outboard won't start; dead period tssaa 20224. 1 Milliseconds = 1000 Microseconds. Supón que necesitas que una tarea se ejecute con periodo. A tick is what you configure it to be. 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. delay_using_macro: 00000000 <delay_using_macro. Tell the scheduler to make it idle, or just delete the task: Code: Select all. richard-damon (Richard Damon) June 22, 2020, 10:44am 3. It is not persistent in so much as it runs in the context of the timer task (the time task has its own stack too, but you. vTaskDelay help Posted by tomirtos on October 15, 2014Hello Everyone! I’m probably missing something very obvious but I don’t understand that when I use the vTaskDelay function the delay is so short, no matter how large the number I put in the argument. It's not advisable to make the tick period any shorter than 1ms. Every time I newly flash the microcontroller, it seems that the vDelayTask hangs up the microcontroller as the LED. Note that this is busy-waiting, so. Here, the task is waiting for some other event to occur, such as the timer on the vTaskDelay() to expire. Basically I just want to run a task a given hertz (for example 50 Hz). zazas321 Posts: 220 Joined: Mon Feb 01, 2021 9:41 am. The actual time that the task remains blocked depends on the tick rate. Once the program is launched, you can observe the tasks running in an orderly fashion. mk","contentType":"file"},{"name":"lame_test. 3 posts • Page 1 of 1. vTaskSuspend(): This function is used to Suspend a task, the suspended remains in the same state util it is resumed. But I can't find the way how to delay microsecond in esp-idf. CM7 parts need an unlock sequence. This function can be used by periodic tasks to ensure a constant execution frequency. Yes, this will work on non CM0 (+) parts. void vTaskDelay( const TickType_t xTicksToDelay ); El tiempo que la tarea dormirá comienza a contar a partir del momento en que se hizo la llamada; por ello decimos que el tiempo es relativo . August 15, 2022. Effectively there will be no delay in task. My idea was to create a freeRTOS task for the stepper motor on core 0, so that core 1 can run. One of the first solutions I thought about was to increase the tick rate to 10kHz and use vTaskDelay(1) to create the intervals, while giving the other tasks a chance to run. The ROM function ets_delay_us() (defined in rom/ets_sys. configTICK_RATE_HZPosted by rtel on November 29, 2013RTOSes. This is the second part of a series of ESP-IDF tutorials that I will complete as I learn stuff. The constant portTICK_RATE_MS can be used to calculate real time from the tick rate - with the resolution of one tick period. Hi all, I'm a new member. Delay a task for a given number of ticks. void vTaskDelay( const TickType_t xTicksToDelay ); El tiempo que la tarea dormirá comienza a contar a partir del momento en que se hizo la llamada; por ello decimos que el tiempo es relativo . The sdk for the chip needed 2msec. The value was 100. vTaskDelay((200L * configTICK_RATE_HZ) / 1000L);. 5 tick?. Conversion table. Multiple Task SynronisationPosted by tabulous2011 on November 19, 2012What is the best way to achieve this ? Say i have 5 tasks, task 2,3,4,5 should not run until task 1 as completed. */ const TickType_t xDelay = 500 / portTICK_PERIOD_MS; for ( ;; ) { /* Simply toggle the LED every 500ms, blocking between each toggle. For light sleep, that should occur when task is paused. I know that the vTaskDelay() cannot go higher than. Hi @Esp_dazz, I'm facing same assertion issue. You should configure a timer to trigger the ADC to take a sample and then preferably use the ADC interrupt to fetch the sampled result. Top. davdav Posts: 207 Joined: Thu Nov 17, 2016 2:33 pm. Using Arduino Programming Questions. Hardware: Board: Lolin32 Core Installation version: d5fdd71 IDE name: IDF component Flash Frequency: 40Mhz PSRAM enabled: no Upload Speed: 115200 Computer OS:. However, I've read that. vTaskDelay () is better for long or imprecise delays, because it lets another task wake up and run while the first task is suspended. void vTaskDelay( portTickType xTicksToDelay );. The actual time that the task remains. delay () will stop every other code from execution. g. ("MICROSECONDS","time in miliseconds=%lli",task_execution_start); // HERE BUNCH OF THINHS HAPPENING SUCH AS TOGGLING RELAYS, PRINTING VARIOUS STATES. Optimizing execution speed is a key element of software performance. The task may also be waiting for some resource, like a semaphore, to be released by another task. Because the largest number you can store in a 16bit unsigned integer is 65535, the longest I can delay for is a little under 2 hours. print("Task1 running on core "); Serial. I assume loop() is called by app_main() which is a priority 1 task itself. g. But for some reason Timer0 is being disabled, and can't use the delay(), millis() and delayMicroseconds(). Anyway the timer ISR is always fired correctly. But for USB work (and I’m just getting to the "oh, I see" stage with that) you really have to use interrupts. void vTaskDelay( const TickType_t xTicksToDelay );. int64_t esp_timer_get_next_alarm (void) Get the timestamp when the next timeout is expected to occur. This port configTICK_RATE_HZ is defined 1000. ESP_Angus wrote:The RTOS tick period is (by default) 1ms, so vTaskDelay() will round this down to 0 ticks, and you'll either get no delay or a full time slice (1ms) delay while another task runs. number of microseconds since underlying timer has been started . cotestatnt October 20, 2022, 11:04am 1. But I can't find the way how to delay microsecond in esp-idf. The watchdog is "fed" in the IDLE task and while the APP_MAIN task has a higher priority than IDLE it is never interrupted. If you select a value < portTICK_PERIOD_MS you may get a zero delay or you may get a delay of portTICK_PERIOD_MS (so 10mS). vTaskDelay is no good for small mS delays. 3 posts • Page 1 of 1. Delaying in microseconds, Delays to things like vTaskDelay will; be in units of ticks, you could always define something like portTICKPERIODMICROSEC, but you still won’t get a finer resolution. For example, specifying a block period of 100 ticks will cause the task to unblock 100 ticks after vTaskDelay () is called. FreeRTOS use premonition system to schedule task, that's means if a task with higher priority exist in running state, scheduler never switch to another task. void loop() { vTaskDelay (portMAX_DELAY); //OR vTaskDelete ( NULL ); } As for the watchdog thing, the simplest option would be to try adding a yield () (aka vTaskYield ()) where necessary. Post by zazas321 » Wed Mar 16, 2022 6:51 am . Given that your debounce strategy takes 31 cycles to decide a button is pressed, that means that you need to keep the button pressed for 3. If you configure a one-shot timer, you will be able to block using a semaphore which is unblocked in a IRQ from the timer. The other code is very big for posting (I may post if require). vTaskDelay . To use scheduler for delay you have to check ready tasks list and (if necessary). However, it is not return. Understanding the vTaskDelay help.