Hi, I'm following the sntp example to get the unix timestamp but. Internally, esp_timer uses a 64-bit hardware timer, where the implementation depends on the target. Take a look at Using millis() for timing. ESP IDF allows you to create the transaction & then reuse. Also only the RTC GPIO pins (GPIO0 - GPIO5) can be used for deep sleep external wakeup. Heap Memory Debugging. Delay in mS vTaskDelay(2000 / portTICK_PERIOD_MS); The RTOS tick period is (by default) 10ms. Hi everyone! I want to implement a timing delay of 1us in my program. Top. esp_timer set of APIs provides one-shot and periodic timers,. B. I dont get any delay even if I add some different delays. tv_usec is set to microseconds, since the original time_t doesn't. void esp_rom_install_channel_putc (int. Use only for very small delays (us or a few ms at most), or else the FreeRTOS IDLE tasks’ might starve and the IDLE tasks’ watchdog will trigger. Top. I haven't measured this, but it wouldn't be surprising if this was a few tens of microseconds. Answers checklist. INCLUDE_vTaskDelayUntil must be defined as 1 for this function to be available. h" esp_task_wdt_reset(); But, this method will not work if there are any other threads that have been registered with esp_task_wdt_add(), because it checks to make sure all threads have called esp_task_wdt_reset() recently, and only feeds the dog if so. As ESP-IDF FreeRTOS is a real-time operating system, it’s necessary to ensure that high throughput or low latency tasks are granted a high priority in order to run immediately. Improving Overall Speed ¶. ESP32 S2 PWM Servo Control. ESP32－delay関数（時間調整について）. But there is problem with only microseconds return value by esp_timer. 10 posts • Page 1 of 1. Let's say portTICK_PERIOD_MS = 10 and you call delay(9). We will demonstrate GPIO Interrupts through an example that uses a push button and an LED. ESP-IDF ESP-BOX ESP-ADF ESP-MDF ESP-WHO ESP. The external interrupt ISR routine will provide a signal to FreeRTOS task functions to control the onboard LED. Its not a great answer but I would suggest IDF and create your SPI transaction at startup. According to the features used by an application, there are some sub sleep modes. The master sends data to the slave. You should use it if you are using arduino, and also you should post in the arduino forum. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. Overview. Delay a task for a given number of ticks. So your clock processor clock should be > 1 MHZ. When the GPIO mux is used, 2 APB clocks of input delay are added to the MISO, increase 2. enthusiastsr November 18, 2021, 9:47am 1. I'm messing around with the following code: #define cyclespermicro 240 #define microcycles (n) (n*cyclespermicro) uint32_t startCounter, counter, cpu_cycles; int. Hardware: Board: ESP32 Dev Module Core. 9 seconds when that happens. Saskia Posts: 40 Joined: Mon Jun 26, 2017 11:45 am. In ESP-IDF you will use esp_timer_get_time() function. vTaskDelayUntil is absolute in terms of the ticks set by scheduler and FreeRTOS Kernel. Step 2: Connect the PWM line. Re:. In particular the following timer’s parameters may be set: Divider: How quickly the timer’s counter is “ticking”. FreeRTOS is an open source RTOS (real-time operating system) kernel that is integrated into ESP-IDF as a component. As you can see I measure the time between two instants using esp_timer_get_time() (this funcion returns an uint64_t with the number of microseconds starting from the power up). Till Now, we have used ets_delay_us FreeRTOS API to get microseconds delay but that is not recommend to use. For this, we’ll use the timer’s. event_base – [in] the event base that identifies the event. There are a few tasks with priorities higher than that of esp_timer (like WiFi task), so while those tasks are running, esp_timer will not dispatch callbacks. The address phase. py monitor. 58acac8. After that, you can use vTaskDelay (. The high level view of startup process is as follows: First Stage Bootloader in ROM loads second-stage bootloader image to RAM (IRAM & DRAM) from flash offset 0x1000. Board index English Forum Discussion Forum ESP-IDF [SOLVED] My function for microseconds delay doesn't work properly. I also used portTICK_RATE_MS but the speed didnt change . Down at the very bottom you'll see two core task. I don't know what the valid maximum value to call with is,. In this ESP32 PWM tutorial with ESP-IDF, we will learn how to generate PWM or pulse width modulation module with ESP32 using ESP-IDF. Therefore, I am trying to implement ESP-IDF timer functions but only the first color. Delay () Delay is an arduino function wrapper that calls vtaskdelay. We will create the web server with the help of the HTTP web server library available in esp-idf. If you are interested in the low level details of the protocol. The write phase. The calculation of the duration take place later. Modem-sleep mode works in Station-only mode and the station must connect to the AP first. int count_delay = 0; while (1). When ı create a task using xTaskCreate() function and adding some delay in the task function. This is the documentation for Espressif IoT Development Framework ( esp-idf ). Okay what you said is correct. I dont get any delay even if I add some different delays. 42 +/- 0. In particular, for ESP32-WROVER module, call rtc_gpio_isolate (GPIO_NUM_12) before entering deep sleep, to reduce deep sleep current. Step 1: Create a new project. Parameters. The FreeRTOS tick frequency is set by default to 100Hz, meaning a tick will occur every 1ms. ESP Wi-Fi supports up to {IDF_TARGET_MAX_CONN_STA_NUM} (``ESP_WIFI_MAX_CONN_NUM``) Wi-Fi connections. Post by filo_gr » Thu Sep 09, 2021 6:57 am . Till Now, we have used ets_delay_us FreeRTOS API to get microseconds delay but that is not recommend to use. 13 posts 1; 2; Next; Ritesh Posts: 1327 Joined: Tue Sep 06, 2016 9:37 am. This depends on the setting of divider, that will be used as divisor of the incoming 80 MHz APB_CLK clock. lets call it C hz. I have searched the issue tracker for a similar issue and not found a similar issue. IDE name: Arduino IDE/IDF component Flash Frequency: 80Mhz Upload Speed: 115200. In this getting started tutorial on ESP32 using ESP-IDF, we will introduce you to some basic concepts while programming ESP32 using ESP-IDF in VS Code. # include <btAudio. microseconds micros : 10814 HPtimer = 10814 --> 10000 calls of micros() on core 1 (500µs longer) but value measured by the two functions give the same result microseconds micros core0 : 10835 microseconds HighPrecTimer: 10216 microseconds HighPrecTimer core0: 10504 microseconds micros : 10795 HPtimer = 10795 microseconds micros core0 : 10783 Delay in uS. My program receives frames: Management, Data and does not receives Control. The spi_flash component contains API functions related to reading, writing, erasing, memory mapping for data in the external flash. I think you can use it in Arduino IDE too, because Arduino Core for ESP32 is just a "interface" that is running ESP-IDF functions. To say it works is really stretching it. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 52-bit range. 13 posts 1; 2; Next; Ritesh Posts: 1325 Joined: Tue Sep 06, 2016 9:37 am. gpio_num – GPIO number (e. Microsecond delay within task. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. This does shave 10-20uS from each transaction. Multiply 0. Click ‘Choose Template’ button to proceed forward. Return. Read part 1. This method is set to be called every ~5sec as a software WDT, you should move EVERYTHING out of this method and have a background task that is woken up by this method. 3. On ESP32, micros() takes about 150 cycles. I had an issue with the chip delivering bad calibration data. vTaskDelay () is supposed to allow a context switch. In the Arduino IDE, the function millis() gives that. Board index English Forum Discussion Forum ESP-IDF [SOLVED] My function for microseconds delay doesn't work properly. This is the second part of a series of ESP-IDF tutorials that I will complete as I learn stuff. 3, every time a socket is created, a lock will be assigned, given that this internal socket array has not been assigned any lock before. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. . esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. I check the time using esp_timer_get_time() at the beggining of my task and again at the end of my task. void Delay_us(uint32_t. ’ For the ESP-IDF board, we have chosen the custom board option. You can update the period at runtime by calling mcpwm_timer_set_period() function. But for some reason Timer0 is being disabled, and can't use the delay(), millis() and delayMicroseconds(). Under the hood, the esp_timer. It's. FreeRTOS is an open source RTOS (real-time operating system) kernel that is integrated into ESP-IDF as a component. Board WEMOS LOLIN32 LITE Device Description just on breadboard. Description. get_idf idf. This will include examples of logging, generating delays, keyboard input and blinking the onboard LED of ESP32. cpp 📋 Copy to clipboard ⇓ Download. Meanwhile, I also tried the idea with the loop and the performance is much better. ). Esp32 packet monitor. Let us now assume that 1/C is faster than the delay you want to wait. As you can see I measure the time between two instants using esp_timer_get_time() (this funcion returns an uint64_t with the number of microseconds starting from the power up). ESP-IDF v5. Hello World, I am trying to control a servo using the ESP32_Servo Library on my ESP32 S2 Board. This function should be provided with a structure timer_config_t to define how timer should operate. 9 posts. To open the project in a new window, click ‘Yes. If we go to the Ticker. If it is used for a timer interrupt, the delay can extend till the execution of the interrupt service routine is finished. It looks to be an unnecessary delay since the previous function, rmt_wait_tx_done, takes. The CPU is executing at a constant processor clock rate. See Sleep Modes for these sleep modes and sub sleep modes. That is how other arduino boards work and a lot of code and libraries expect delay to work as per the documentation. esp_deep_sleep_start() This API is used to enter Deep-sleep. When ı create a task using xTaskCreate() function and adding some delay in the task function. the time param is of type "timeval", which is a struct that has two members that you set: "tv_sec" and "tv_usec". I also used portTICK_RATE_MS but the speed didnt change . So, Normal communication with that module using ESP32 is UART but to upgrade. Pause can be longer if the implementation requires it due to precision/timing issues. The ROM function ets_delay_us() (defined in rom/ets_sys. ESP-IDF ESP-BOX ESP-ADF ESP-MDF ESP-WHO ESP-SkaiNet ESP32 Arduino IDEs for ESP-IDF ESP-AT ESP IoT Solution ESP. 9 posts. IDF documentation suggests microsecond delay - should be millisec. IDF version. For full installation instructions, see the ESP-IDF Programming Guide. Introduction ¶. When ı create a task using xTaskCreate() function and adding some delay in the task function. Hi everyone, I would like to measure a pulse duration of 32us (4 clock cycles at 125kHz). The event loop library keeps a copy of event_data and manages the copy’s lifetime automatically (allocation + deletion); this ensures that the data the handler receives is always valid. Delay(). They are all 64-bit generic timers based on 16-bit. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 52-bit range. Joined: Wed Jul 28, 2021 12:25 pm Location: Italy [SOLVED] My function for microseconds delay doesn't work properly. us – Number of microseconds to pause . espidf – Return the total size of the ESP-IDF, which includes the CircuitPython heap. We will look at how to produce the PWM signals with LEDC hardware of ESP32 and attach those signals to any of the GPIO pins. Sometimes it delays for exactly 2 seconds but sometimes it misses 10ms. N. Use this function if an RTC IO needs to be disconnected from internal circuits in deep sleep, to minimize leakage current. Because all the callbacks are dispatched from the same task, it is recommended to only do the minimal. Inter-Processor Call (IPC) Interrupt Allocation. This function should be provided with a structure timer_config_t to define how timer should operate. 9 microseconds per entry. Ddelays smaller than 10ms used in a loop would starve the FreeRTOS IDLE tasks’ as they are low prio tasks and hence the the IDLE tasks’ watchdog will trigger. ) Using esp_timer_get_time () generates “wall clock” timestamps with microsecond precision, but has moderate overhead each time the timing functions are called. Different from the API before IDF v4. 13 posts 1; 2; Next; Ritesh Posts: 1327 Joined: Tue Sep 06, 2016 9:37 am. Tested making a call and saving values. Timer callbacks can be dispatched by two methods:As you can see from the logs, the time keeps deviating. ESP-IDF is the official development framework for the ESP32, ESP32-S, ESP32-C, ESP32-H and ESP32-P Series SoCs. There is no Arduino RMT API that solves this issue (which IMO - is not a real issue, but a. This will take about 30 microseconds to execute:. A transaction on the SPI bus consists of five phases, any of which may be skipped: The command phase. To create a timer, call esp_timer_create (). I'm not sure this behaviour has ever been different in ESP-IDF, with the test app posted above I see the same behavior on v3. It has 8 channels which can generate independent waveforms that can be used, for example, to drive RGB LED devices. After this time, the interrupt callback is executed. One is to wait for a period after resetting a chip (BME280). Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. Dimming Neopixels, Delays<Microseconds. To delete the timer when it is no longer needed, call esp_timer_delete (). Different from the API before IDF v4. 1. July 6, 2022. Even a simple loop causes it to crash: ELF file SHA256: 0000000000000000 Backtrace: 0x4008860c:0x3ffbf8f0 0x40088889:0x3ffbf910 0x401300bc. I am new to esp32 wanted to know how I can have a timer for 100 microseconds. I looked at the timers example and the timer does make it work and ESP32 can say something. The ROM function ets_delay_us() (defined in rom/ets_sys. Not a typo; an empathetic nod to Jesús Gris. I guess the system timer runs with a resolution of 1 ms. int64 = 292,471 years before overflow at uS resolution! Unlike gettimeofday function, values returned by esp_timer_get_time() start from zero after startup of the chip wakes up from deep sleep and do not have. sleep_us(us): This is yet another blocking method that provides a delay in microseconds. (Although ESP-IDF doesn't support tick rates higher than 1000Hz. Hello community, I made a. The second ISR would be connected to the Timer. red. Second Stage Bootloader loads partition table and main app image. Thus, all ESP-IDF applications and many ESP-IDF components are written based on FreeRTOS. Intensity-Duration-Frequency (IDF) Files: Includes the latest version of short-duration rainfall Intensity-Duration-Frequency (IDF) statistics in the form. When ı create a task using xTaskCreate() function and adding some delay in the task function. Now, generally, the analogRead() execution time on ESP32 is in the ballpark of 10 microseconds. print output. esp_timer set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. To create a timer, call esp_timer_create (). Check the documentation page for details . The API is slightly different than that for the ESP32. 2. The ESP32 chip contains two hardware timer groups. The second ISR would be connected to the Timer. management agency) on updating IDF curves and incorporating climate change into IDF curves • Early work with Insurance Bureau of Canada (Canadian P&C insurance. Parameters. The logging library is commonly used by most ESP-IDF components and examples. I don't want to use the vTaskDelay () since it effects also other part of. Joined: Wed Jul 28, 2021 12:25 pm Location: Italy [SOLVED] My function for microseconds delay doesn't work properly. Do you really want to block and spin for 9ms? I do. 0000041666666666667 ms by X to get your time delay or you can use pdMS_TO_TICKS ( X ) which will do it for you. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. e. It should be something you could tweak for the desired result -- if you have a way. When the timer expired it would be triggered. I have ensured that this is the only task with priority 1. period: timer period, in microseconds . Optimizing execution speed is a key element of software performance. ESP-IDF is the official development framework for the ESP32, ESP32-S, ESP32-C, ESP32-H and ESP32-P Series SoCs. You guys have made an extremely impressive platform, to say the least. 13 posts 1; 2; Next; Ritesh Posts: 1325 Joined: Tue Sep 06, 2016 9:37 am. I am trying to measure the duty cycle interval (from falling to rising edge) in microseconds of an incoming PWM signal of 20 KHz. 1 is a minor update for ESP-IDF v5. h) will allow you to busy-wait for a correct number of microseconds. In that case task for HTTP / HTTPS request will wait for datas almost 50 days. The code here presented is IDF only related. For ESP-IDF target, we have chosen ESP32 module. us: Number of microseconds to pause . Joined: Wed Jul 28, 2021 12:25 pm Location: Italy [SOLVED] My function for microseconds delay doesn't work properly. By including esp_wifi. Then look at the hello world example and modify it blink an LED while still continuously printing the 'hello world' string. To switch to a different SoC target, choose target from the dropdown in the upper left. Neopixels have great possibilties. Board index English Forum Discussion Forum ESP-IDF [SOLVED] My function for microseconds delay doesn't work properly. because it seems to me that delayMicroseconds does not work on esp or am I wrong? is there something like this for ESP? Top. I dont get any delay even if I add some different delays. A beginners guide, Several things at the same time and the BlinkWithoutDelay example in the IDE. Mind you calculated Serial baud rates differ for each clock speed set. Internally, esp_timer uses a 64-bit hardware timer. Very simple, but functional solution for ESP8266 with IDF/RTOS and neopixel strip. 9 posts. Now let us discuss the SPI Master driver library and its functions provided by ESP-IDF that will be used in this tutorial. I would like to toggle an output pin in the order of microseconds so use the function delayMicroseconds. bvernoux changed the title vTaskDelay / portTICK_RATE_MS wrong delay vTaskDelay / portTICK_RATE_MS wrong delay (not an issue) on Oct 19, 2016. Additionally, there are some power-down options that can be configured to further reduce the power consumption. py monitor. Now click ‘ Create project using template esp_timer . ESP_igrr wrote:esp_timer_get_time returns 64-bit time since startup, in microseconds. Because there are more interrupt sources than interrupts, sometimes it makes sense to share an interrupt in multiple drivers. Code that executes faster can also have other positive effects, like reducing overall power consumption. void esp_rom_install_channel_putc (int channel, void (* putc) (char c)) esp_rom_printf can print message to different channels simultaneously. For example, some device drivers require a delay implementation, and might use it to sleep anywhere from a few dozen microseconds to a few hundred milliseconds. 9 posts. vTaskDelay issue bit me. So if you modify CCOUNT, this will likely affect FreeRTOS tick interval. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. According to the docs, the third parameter of timerAlarmWrite (timer, DELAY * 1000 * 1000, false) is a boolean that specifies whether the timer will. 9 posts. In light sleep mode, digital peripherals, most of the RAM, and CPUs are clock-gated, and supply voltage is reduced. vTaskDelay(500 / portTICK_RATE_MS); You can use vTaskDelay () even if not using FreeRTOS tasks. unless delay actually calls vTaskDelay on esp32, which it does. THE TICK is a new Netflix show. In this phase, an address (0-64 bit) is clocked out. 9 seconds -- and this routine will delay for nearly 17. #include "esp_task_wdt. That will be at the few beginning of the acceleration when the step rate is the slowest. Each interrupt has a fixed priority, most (but not all) interrupts are connected to the interrupt matrix. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. . in order to get a microseconds’ delay for another try. Upon exit from light sleep, peripherals and CPUs resume operation, their internal state is preserved. Top. Points (x) show quantiles associated with (from bottom to. esp_timer provides one-shot and periodic timers, microsecond time resolution, and 64-bit range. Joined: Wed Jul 28, 2021 12:25 pm Location: Italy [SOLVED] My function for microseconds delay doesn't work properly. This is double the 40 MHz default value and will double the speed at which code is loaded or executed from flash. This callback function is called from the esp_timer task each time the timer elapses. Type ESP-IDF: New Project in the search bar and press enter. void esp_rom_delay_us (uint32_t us) Pauses execution for us microseconds. Till Now, we have used ets_delay_us FreeRTOS API to get microseconds delay but that is not recommend to use. us – Number of microseconds to pause . If I take 64 readings with a 1ms interval for stability that's 64 milliseconds. Oh, now that IS useful! - now I wish I hadn't just spent the last hour implementing the exact same thingThis callback function is called from the esp_timer task each time the timer elapses. Post by filo_gr » Thu Sep 09, 2021 6:57 am . Set the GPIO interrupt type to low/high. I have disabled all interrupts. many colors. So is there a way I can implement a delay… Hello community, I made a function that should be able to create a delay for a certain number of microseconds, here the code. It’s also one of the worst things. This example delays by 500ms: esp-idf-equivalent-to-arduino-delay. The watchdog is "fed" in the IDLE task and while the APP_MAIN task has a higher priority than IDLE it is never interrupted. 13 posts 1; 2; Next; Ritesh Posts: 1330 Joined: Tue Sep 06, 2016 9:37 am. Post by peterglen » Tue Oct 06, 2020 7:46 pm . Internally, esp_timer uses a 32-bit hardware timer (FRC1, “legacy” timer). 2. Hello, I am trying to provide delay between the RGB colors of an led. Hardware Configuration a Potentiometer is connected to my broad and used as Analogue input. sleep ( 1 ) # sleep for 1 second time . Hello community, I made a. The timer_u32. There are a thousand microseconds in a millisecond and a million microseconds in a second. Numeric values in an array from a 8-bit 8kHz wave file. , reducing overall power consumption. (infrared of 905nm) with “digitalWrtie”, but I do not get pulses under 2 microseconds. 00001 seconds, which will hardly affect your calculations. Code: Select all. hw_timer_t * timerBegin(uint32_t frequency); frequency select timer frequency in Hz. To open the project in a new window, click ‘Yes. When ı create a task using xTaskCreate() function and adding some delay in the task function. I guess the system timer runs with a resolution of 1 ms. The source files attached to this release will not work due to our use of git submodules. Timer callbacks can be dispatched by two methods: embedded_hal states that delay_us: Pauses execution for at minimum us microseconds. As you pointed out delay works fine in Arduino IDE, if you consider Arduino as component to be unsupported then please close this issue!. I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there. 0, register access macros which write or read-modify-write the register can no longer be used as expressions, and can only be used as statements. Timer callbacks are dispatched from a high-priority esp_timer task. Board index English Forum Discussion Forum ESP-IDF; Need API support to provide micro seconds delay. Suggested change -- change "microseconds" to "milliseconds" because vTaskDelay is based on FreeRTOS time tic which is in multiple milliseconds. timer speed (Hz) = Timer clock speed (Mhz) / prescaler. The IDF zone occurs in southern BC, covering 5. There are the following two time sources: RTC timer: Allows keeping the system time during any resets and sleep modes, only the power-up reset leads to resetting the. Till Now, we have used ets_delay_us FreeRTOS API to get microseconds delay but that is not recommend to use. To start the timer in one-shot mode, call esp_timer_start_once (), passing. Use one of the following methods instead:. ESP-IDF equivalent to Arduino delay () You can use the FreeRTOS API to provide a delay similar to the Arduino delay () function in the ESP-IDF framework. Therefore if you set a tick period of 2ms (500hz) and request a delay of 1 tick you will get a delay of between just over 0 ms (if the request to delay. h file, we can easily see the include for the esp_timer. vTaskDelay () is. Here is the github repo: Sketch file. I also used portTICK_RATE_MS but the speed didnt change . For the operating frequency, ESP32 master clock is divided from APB clock (80MHz), so only 80, 40, 26. com> */ # define uS_TO_S_FACTOR 1000000 /* Conversion factor for micro seconds to seconds */ # define TIME_TO_SLEEP 21600 /* Time ESP32 will go to sleep (in seconds) */ RTC_DATA_ATTR int bootCount = 0; /* Method to print the reason by which ESP32 has been awaken from. h","path. When the operation is complete, the callback function will be called with ESP_HIDD_OPEN_EVT. Example: delay_microseconds (2000000) //waits for 2 seconds. [ −] pub struct Ets; Espressif built-in delay provider for small delays. When the timer expired it would be triggered. get_idf idf. Post by filo_gr » Thu Sep 09, 2021 6:57 am . Correct, the default esp-idf settings. Inside this timer ISR you would reset/disable the timer, then process your delayed action and return. Using Arduino Programming Questions. They are all 64-bit generic timers based on 16-bit pre-scalers and 64-bit up / down counters which are capable of being auto-reloaded. We will first look at the ESP-IDF structure. Description: micros() returns strange values when using arduino-esp32 as component of esp-idf, millis() returns values higher when using arduino-esp32 as component of esp-idf, then values using simply from Arduino IDEOverview. I encountered the following problem when using it: if I use a value such as delay_us(20) , it doesn't work! This function should be provided with a structure timer_config_t to define how timer should operate. 1 is mostly compatible with apps written for ESP-IDF v5. There are other tasks running in the background but they have priority 2 or higher. Before ESP-IDF V3. They are all 64-bit generic timers based on 16-bit pre-scalers and 64-bit up / down counters which are capable of being auto-reloaded. Parameters. The spi_flash component contains API functions related to reading, writing, erasing, memory mapping for data in the external flash. ESP-IDF TODO. Before ESP-IDF V2.