Otherwise, if your ESP32 sometimes connects to the Wifi network almost immediately and sometimes it doesn’t seem to connect at all, use this code instead to automatically reset the ESP32 if it doesn’t connect within 5 seconds: fix-esp32-not-connecting-to-the-wifi-network. The maximum MTU Size setting of BT A2DP (default) is 1008 bytes, of which the header occupies 12 bytes and the actual amount of data transmitted by the application layer is 1008 - 12 = 996 (bytes); the maximum MTU Size of BT SPP (default) Set to 990 bytes. They are typically used as FIFOs (First In First Out) [1], meaning that new data is inserted. Hello, My question is about implementing the functionality of HALDelay(), which is implemented based on the SysTick timer tick count. Now that I have the control of NTP sync procedure, it would be a very nice feature to add non blocking NTP request. Queues are very useful for inter-task communication, allowing to send messages from one task to another safely in terms of concurrency [1]. An ESP32 timer group should be identified using timer_group_t. 625°/64 in half-step mode. Therefor, I read a lot, especally about xSemaphoreGiveFromISR which seems to be the most efficiant way to deal with this problem. A life saving, non blocking wifi configuration protocol. ESP8266/ESP32 non-blocking WiFi/AP web configuration. Set blocking or non-blocking mode of the socket: if flag is false, the socket is set to non-blocking, else to blocking mode. The 28BYJ-48 Stepper Motor has a stride angle of 5. The pieces to make a fully functional non-blocking analogRead were already a part of the ESP32 arduino. At its heart, there's a dual-core or single-core. Hi there, straight to the point. ducalex commented on Jul 11, 2019 •. If you need better resolution, micros()may be the way to go. To overcome this, the following code implements a non-blocking approach by utilizing the ezLED library. Find this and other ESP32 tutorials on. The datatransmission was very unreliable. As the name implies, the Arduino will stop most of whatever it’s doing and wait for the delay()-function to finish before executing other code. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with ESP32. The sprintf () function can be used to convert the elements of a byte array to a NULL terminated char array. Now, just before the waitForNextCycle () function, let’s define the lightSleep () function that will put the ESP32 into sleep for SLEEP_DURATION microseconds: Well, now we’ve got. The elapsed time then is very unaccurateOne way would be to set up a FreeRTOS message queue which your while loop can scan. Delay () Delay is an arduino function wrapper that calls vtaskdelay. The non-blocking interface call does not block the current process, while the blocking interface does. esp8266;. . } var. The sensor works great, but in the library on some points there are delays. You'll see blynkTimer Software is blocked while system is connecting to WiFi / Internet / Blynk, as well as by blocking task in loop(), using delay() function as an example. Which makes 'loopDelay' a stupid name 'SerialInterval' is more appropriate. I'm trying to receive a data from one esp32 to another. 2 but this function is blocking 'while (1)' loop in main function. This sketch demonstrates how to blink an LED without using. ) ie the send buffer size in bytes is the parameter value. All these buttons are connected to each other in a form of 4X4 matrix in row and column arrangement. Another benefit millis()is that it doesn't prevent us from running code while "waiting". This is done by creating a noDealy object and setting the amount of time for the delay you want. The "delay" node does two things: (1) It allows you to delay a message by an arbitrary amount of time and (2) to limit the rate of messages that are passing through it. After this change, the client still attempts the connection for too long. pcbbc: I’m not sure it’s bizarre. In vTaskDelayUntil you say the time at which you want to be woken. h> //SSID of your network char. Re: vTaskDelay () vS. I am struggling with understanding the ESP32-S2 timer interrupt library (s). Here we discuss how to use millis() and micros() and their major advantages compared to delay(). There is a solution comes with async TCP library for Arduino based ESP8266 users, where you can adapt your code base on it, and here is the sake of flexibility. Consult the datasheet of your microcontroller if you’re using a non-AVR MCU. In this guide, we will show you how to use FreeRTOS timers and delays using ESP32 and ESP-IDF. For delays longer than a few thousand microseconds, you should use. So I assume you are using arduino-esp32 as a component with your own sdkconfig settings? Correct, the default esp-idf settings. If it has, it toggles the LED on or off and makes note of the new time. ESP32 SoC has two processor cores (three in fact, if you also count the ULP core). Each Device shares the MOSI, MISO and SCLK signals but is only active on the bus when the Host asserts the Device’s individual CS line. Click the Debugger tab. This means that you can use any 16 GPIOs to generate PWM output. Hi everybody, As discussed in this thread The RTC-time drifts away pretty fast when the ESP32 is in a sleep-mode. Therefor, I read a lot, especally about xSemaphoreGiveFromISR which seems to be the most efficiant way to deal with this problem. void startTaskFunction(void *params) { //this is the function while ( true ) { xSemaphoreTake (StartSema,portMAX_DELAY); //which in order to start waits this Semaphore to be Given while ( true ) { //do some logic to controll a motor and keep it steady /////to stop this while. It includes in-built antenna switches, RF balun, power amplifier, low. Here it is set to make a delay of 50ms: _delay_ms(50); The same library has a microsecond delay function as well: _delay_us(). A task runs until it says. 9. 2. ESP32 - LED - Blink Without Delay; ESP32 - LED - Fade; ESP32 - RGB LED; ESP32 - Traffic Light; ESP32 - LED Matrix; ESP32 - LED Matrix via Web; ESP32 - Potentiometer; ESP32 - Potentiometer fade LED;. The ESP32 behaves like a computer. Step 1: Advantages of the VirtualDelay Library. Task 2 will run on core 1, receiving data from first task and send it async over TCP. Configuring ESP8266/ESP32 as a TCP server using sockets. Getting Date and Time from NTP Server. h BaseType_t xTaskDelayUntil( TickType_t *pxPreviousWakeTime, const TickType_t xTimeIncrement ); INCLUDE_xTaskDelayUntil must be defined as 1 for this function to be available. As for making EEPROM writes non-blocking, you could set a (non-blocking). Optional - an ESP32 e. com. Includes SafeStringReader: non-blocking tokenizing text reader, BufferedOutput: non-blocking text output, BufferedInput: extra buffering for text input, loopTimer: track of the maximum and average run times for the loop, PinFlasher: non-blocking flashing on an output Pin and millisDelay: a non-blocking delay, with single-shot, repeating. The second core is not impacted by the cycles used for connecting WiFi but you will need to consider whether you need. Figure 3 – Non-Blocking Driver Sequence Diagram. You'll see blynkTimer Software is blocked while system is connecting to WiFi / Internet / Blynk, as well as by blocking task in loop(), using delay() function as an example. I think it's in the _client->connect at the start of the method. micros() and overflow. Hello together, I’m using the Pololu - VNH5019 Motor Driver Carrier to control a 12v motor with an ESP32. The config portal will stay available after WiFi connection was made. ype Function AnalogI do not use millis() and delay() with the ESP32 and I write all my ESP32 code using freeRTOS, which would make a significant difference in operations. Supports: GET and POST; Request and response. 0. And we’re going to do it with our second button (the one on the right), the sleepButton. void loop () { callTask_1 (); // do something callTask_2 (); // do something else callTask_1 (); // check the. As long as the delay is "delaying" nothing else of the code can be executed. h> Servo myservo; void setup() { // Initialize serial and wait for port to open: Serial. I want to add an ultrasonic sensor detector into a robot car which is controlled via android app by user. Every: Non-blocking replacements for delay(). g. All functions are non-blocking (without using delay() function) Easy to use with multiple LEDs. ducalex commented Jul 11, 2019 •. setInsecure(); while (status != WL_CONNECTED) { Serial. Which means the freeRTOS task switcher will swap to another task during the delay, non-blocking. pcbbc July 2, 2020, 9:44pm 5. Is your feature request related to a problem? Mostly, I end up using Serial. Every: Non-blocking replacements for delay(). Non-blocking delays only run after enough time has passed, and then they reset. timeout_ms" would make the client stop blocking after 50ms, but perhaps I misunderstood. So on real Arduino boards, there's nothing else for delay() to do other than wait for the delay to complete. Hardware: Board: Lolin32 Core Installation version: d5fdd71 IDE name: IDF component Flash Frequency: 40Mhz PSRAM enabled: no Upload Speed: 115200 Computer OS: Windows 8. vTaskDelay is a non-blocking delay. 625º—so it needs 360º/5. !) BTW I'd be happy to submit a PR if there's an agreement on what it might. See the RTOS Configuration documentation for more information. I already used the sys. The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. i want to call a function in the main loop: manual_delay_function (3000UL) // delay for 3 seconds. Put your own animated GIF files on the "espgfxGIF/data" folder. The SPI controller peripheral external to ESP32 that initiates SPI transmissions over the bus, and acts as an SPI Master. time. The callback-function void SNTP. It seems to me that the delay() function never works! I tried using the millis() as well and it doesn't work so well neither. Please take note that the previous code utilizes the delay() function, which is straightforward to understand. Its argument is the struct_time or full 9-tuple (since the dst flag is needed; use -1 as the dst flag if it is unknown) which expresses the time in local time, not UTC. To change it unblocking you must in the loop, in each round: if btn pressed store the pressMillis, lit the led. 10. Postby Vaskov » Fri Oct 15, 2021 10:38 am. ) No blocking. We’ll discuss a couple of ways to achieve this. Solutions would be find another library, or fix the one you are using. There will be 2 task, first task will run on core 0, communicating with sensors to collect data at 4000SPS, using SPI bus. 2 Overview Overview Name No. Get the on/off LED's states: LED_OFF, LED_ON. Interrupt based movement (movement without calling update() manually in a loop) is supported for the following Arduino architectures: avr, megaavr, sam, samd, esp8266, esp32, stm32, STM32F1 and apollo3. Can you give us any guidance on the response time needed for the WiFi/Server code running in an ESP32 VS other user code?? THANKS! Any comments or suggestions or critique welcome! NoDelay. Note that the "single key" idea still blocks until the user hits that key. This number represents the time (measured in milliseconds). h library in your code, as follows: #include <WiFi. You'll see blynkTimer Software is blocked while system is connecting to WiFi / Internet / Blynk, as well as by blocking task in loop(), using delay() function as an example. ; The. 3. Input. The time module provides the following time, date, and delay-related functions. I am using an ESP32-WROOM-32 Development Board (30 pin version) with Platformio (CLion version). 10. What I have managed so far is to get the actual time from an NTP-server on boot. Since the esp32 core builds on freertos, you get: void delay (uint32_t ms) { vTaskDelay (ms / portTICK_PERIOD_MS); } and vTaskDelay is defined off in the depths of FreeRTOS somewhere (source for freertos is not included in the Arduino distribution, although it is open. Note how simple it looks compared to the delay timer non-blocking method, and it works! Copy SketchThe latest commit to the RMT code (8ff3520) – to zero out the newly initialised rmt_config_t object – is causing panics for me on ESP32 devices when I start a second looping RMT channel. There’s probably not a good reason for that, other than the library writer didn’t think it necessary to code it as non-blocking. SNTP library that provides more accurate time for ESP8266/ESP32. e. Re: vTaskDelay () vS. ). void startTaskFunction(void *params) { //this is the function while ( true ) { xSemaphoreTake (StartSema,portMAX_DELAY); //which in order to start waits this Semaphore to be Given while ( true ) { //do some logic to controll a motor and keep it steady /////to stop this while. Hi everybody, recently I wrote some testcode to test wireless communication with the ESP-NOW-protocol for ESP8266/ESP32 boards. (in ms) delay before toggling LED . Kindly let me know for the solution to run event based mqtt callback. I haven't measured this, but it wouldn't be surprising if this was a few tens of microseconds. 3000ms is enough). g. Code: [Select all] [Expand/Collapse] void delay_us (uint64_t number_of_us){. I'd replace delay with a wake up time for deep sleep. You wire the load cell wires on one side, and the microcontroller on the other side. I edited the example code and removed all I. At first glance you may doubt the usefulness of this function. From there you place code you want to run in a if statement that checks. ESP32-WROOM-32 PWD with millis. How can I rewrite this section, that this is not blocking the main loop but also reading in the wifi-message and the sensor data? Re: non blocking wifi client connection #68870 By andre_teprom - Sun Aug 06, 2017 11:21 amIntroduction. You just don't want to do all the stuff every loop. This means that the shaft (visible. Blocking code is in a seperate task. It seems that your specific problem here is that Blynk. 1. As we know by now, analogWrite does not actually drive an analog voltage to the specified pin but, instead, uses pulse-width modulation (PWM). Maintainer: Michael Contreras. read(1) to read a single character but it halts the program execution while the user do not send that character. mktime(t: struct_time) → int. See the RTOS Configuration documentation for more information. I. QoS 1 and 2 have different behaviors since the protocol requires extra steps to complete the process. Hardware Arduino UNO or any other board supported by the Arduino IDE All the code developed here can be tested with just an Arduino UNO. h" #include <Servo. This is useful to send comamand from your PC to ESP32. This library enables you to use Interrupt from Hardware Timers on an ESP32-C3-based board. My code uses both cores of the ESP32 and seems to work well. MicroPython Timer API supports allf four hardware timers. Blocking code can easily be avoided with an ESP32 by using the multi. h> void setup() { Serial. For this tutorial, let’s only focus on how to generate time delays in us and ms with high accuracy. That's the whole reason of not using delay(). You should copy it and use it here. See Wait() method. Return-1 If connection establishment fails. 5 seconds; And go back to step 1, because the loop() function keeps being executed again and again. I have the socket setup in non blocking mode with : err = fcntl (sock, F_SETFL , O_NONBLOCK ); and for good measure I do the send call with: err = send (sock, tempbuf, tempbuflen, MSG_DONTWAIT ); I time. function codes implemented:Returns: pdTRUE if the semaphore was obtained. When the server is requested by a client, like a computer connected to the same WiFi connection, it returns an HTML page. The objective is to allow the Arduino to continue doing what it was doing before the interrupt. In FreeRTOS, there are a few ways to delay the execution of a function: vTaskDelay() allows us block the currently running task for a set amount of time (given in ticks). Why not use the ESP32's OS, freeRTOS, vTaskDelay which is a non blocking delay? Also, freeRTOS has buffers that would handle such a. ESP32Time: Set and retrieve internal RTC time on ESP32 boards. For TCP, there is a non-standard IDF extension which allows you to call call setsockopt (TCP_SNDBUF) with an int-sized parameter which is the send buffer size as a multiple of the TCP_MSS value (rather than in bytes. This process is done at a high frequency for all of the columns and rows. ESP32 Classic Bluetooth has two protocols, namely A2DP and SPP. This hardware-based PWM library, a wrapper and enhancement around ESP32-core ledc code, enables you to use Hardware-PWM on ESP32, ESP32_S2, ESP32_S3 and ESP32_C3 boards to create and output PWM. In fact, the number of cores doesn't really matter much as long as you're not running out of CPU cycles or violating the real-time deadlines of your animations. ESP_Log. Using delay on a ESP32 whiles using freeRTOS is a waste of CPU time. Configuring ESP8266/ESP32 as a TCP server using sockets. Since a non-blocking operation does not put in its best effort in the foreground, it can either return the current result or spawn a background job to complete the task. ESP8266/ESP32 non-blocking WiFi/AP web configuration. Describe the solution you'd like. The main reason to use non-blocking delays is because delay() blocks code execution until it returns, which means nothing else can run while delay() is delaying. The whole idea is to avoid using millis() function and not blocking each iteraction of the list. setblocking(True) is equivalent to sock. It is also. The pseudo code shown below gives a non blocking. Can ESP32 use the IP of the previous successful connection for communication after connecting to the router, and in case of failure, re-enter the authentication process and use DHCP to obtain a new IP?A well known Arduino function is delay() which pauses the program for an amount of milliseconds specified as parameter. UDP packets can get lost and DNS servers can be slow to respond, so there has to be some amount of retransmits and waiting to see if there is a response as part of the process. Holds Now() for the next same period. One way would be to set up a FreeRTOS message queue which your while loop can scan. And it is a non-blocking implementation in a multi-tasking system. This non-being-blocked important feature is absolutely necessary for mission-critical tasks. Timer Initialization¶. knightridar:That is the firmware. Espressif Homepage; ESP8266EX Official Forum;. Then, each time through. Extra. i do not need very fast measuring intervals (e. We will also expand the example. This simple library for Arduino implements a machine state for reading the Maxim Integrated DS18B20 temperature sensor without blocking the main loop() of the sketch. Ask Question Asked 7 years, 7 months ago. EDIT: @HS2 raised that a better approach should be using a. The constant portTICK_PERIOD_MS can be used to calculate real time from the tick rate - with the resolution of one tick period. Using BLDC. The datatransmission was very unreliable. This means that the shaft (visible. What I have managed so far is to get the actual time from an NTP-server on boot. I am trying to create my own delay function but my sketch keeps crashing. Which makes 'loopDelay' a stupid name 'SerialInterval' is more appropriate. Some ports allow specifying the delay time as a floating-point number. Here is some example code. To hook the module up to the Arduino, do the following: Attach the Vcc and Gnd pins on the module to there compatriots on the Arduino. A fade can be operated in blocking or non-blocking mode, please check ledc_fade_mode_t for the difference between the two available fade modes. ESP targets such as ESP32, ESP32-S3, and ESP32-P4 are dual-core SMP SoCs. Yes, delay (8000); in your void timeDelay () {. So, my RealTime Worry is: ESP32 co-hosting Wifi, Server, engine/generator controller state machine, with needed delays and timeout checks. 5 seconds and 5 minutes. Once downloaded, start the Arduino IDE then go to Sketch > Include Library > Add Zip Library. However, be aware that micros() will overflow after approximately 70 minutes, compared to millis()'s 50 days. This means that the motor has a step angle of 5. one possible headache with this is that there isn't really a way to account for the multi threaded nature of the esp32, if for example something on core0 calls availableForWrite then something one core1 writes to the uart, it could invalidate the answer given to the thread on core0 before it has a chance to write to the uart. unsigned long ini= 0 ; void setup() { Serial. Important Notes about using ISR. The "delay" node does two things: (1) It allows you to delay a message by an arbitrary amount of time and (2) to limit the rate of messages that are passing through it. Let me try to give some code example. However, if you incorporate additional code, it may get blocked during the delay time. We can use multiple delays sequentially in a loop. You're 95% of the way there. Please note that the actual PCB layout design and excessive loads may increase the input delay. This function. To change it unblocking you must in the loop, in each round: if btn pressed store the pressMillis, lit the led. A blocking function stops the program from performing any task until the previous one is completed. The timer delay is non-blocking. Hi, i am using the OneWire Library. The configuration is persisted in EEPROM. However, the problem is, the delay () function is not. Gotta be something to do with that register you set, or the setcrystal thing or one of those libraries. Compatibility. Non blocking behavior can always be achieved manually by calling update() or updateAllServos() in a loop - see ThreeServos example. Looking back it is clear sure a delay delays = blocking the whole. system February 16, 2009, 4:57pm 6. Which can be used to create a time base for various events in your applications (like LED blinking or whatever). ino at master · prampec/IotWebConf. there is a new visualisisation how non-blocking code works. Hello together, I’m using the Pololu - VNH5019 Motor Driver Carrier to control a 12v motor with an ESP32. This matrix keypad has got 8 pins, 4 for column and 4 for rows. everytime: A easy to use library for periodic code execution. The earliest date for which it can generate a time is Jan 1, 2000. Hardware Instruction. Hi guys, I am having problems with my robot car project. INCLUDE_vTaskDelay must be defined as 1 for this function to be available. The issue is that to get the distance from the ultrasonic, you need to perform small delays over the code. delayMicroseconds. You simply need to include the time. . At the moment, you seem stuck with an approach where you have to fight the RTOS. The problem is that delay () is a "busy wait" that monopolizes the processor. You're 95% of the way there. This non-being-blocked important feature is absolutely necessary for mission-critical tasks. Setting EEPM1 and EEPM0 both to 0 will erase and program a new byte in a single operation. This code is a blocking code right now, it is using delays. The time setting can be done manually through a network protocol or a battery backup. I like this option the least although it's probably the simplest. Important Notes about using ISR. The first thing you need to do to use the ESP32 Wi-Fi functionalities is to include the WiFi. Supports millis, micros, time rollover, and compile time configurable number of tasks. Created by Espressif Systems, ESP32 is a low-cost, low-power system on a chip (SoC) series with Wi-Fi & dual-mode Bluetooth capabilities! The ESP32 family includes the chips ESP32-D0WDQ6 (and ESP32-D0WD), ESP32-D2WD, ESP32-S0WD, and the system in package (SiP) ESP32-PICO-D4. muTimer. Support both control modes: CTRL_ANODE and CTRL_CATHODE. Best power transistor for a high PWM output from ESP32. However, the loops don't have delay() or vTaskDelay() in them and I was wondering if that would cause issues with the pinned tasks blocking other system/housekeeping tasks from executing, as discussed in this thread. The actual time that the task remains blocked depends on the tick rate. The timing of these timers depends upon the clock and varies from one board to the other. for esp32:. Timing. ESP32Time: Set and retrieve internal RTC time on ESP32 boards. Every example I see requires the use of millis () but I need an accurate, 100uSec, non-blocking ISR driven. i do not need very fast measuring intervals (e. Wokwi Arduino and ESP32 Simulator. In the previous tutorial, we learned to blink LED by using the delay method. Post by ry1234 » Sat Feb 04, 2017 3:42 am . Messages with QoS 0 is sent only once. EveryTimer: A library providing the possibility to call a function at specific time intervals. The config portal will stay available after WiFi connection was made. I found out it was caused by the command delay(). loop() , it checks to see if the desired blink time has passed. IotWebConf will start up in AP (access point) mode, and provide a config portal for entering WiFi connection and other user-settings. Where was this post 4 hours ago? Too stubborn to google is a flaw. 2. The while-loop looks like this: while (WiFi. ESP32, if one is to look at the code for delay(), as I was shown, one will see that delay() on an ESP32 invokes vTaskDelay(), to run vTaskDelay(), a non-blocking delay, freeRTOS will be loaded. delay (100);} uint32_t readADC. IoTtweetESP32: A library that makes Internet of Things send data and control on IoTtweet. sleep (seconds): This blocking method provides a delay in seconds. You could also unit the task with a pointer to a static variable that defines the delay time and use that instead of hard coding it. It means that non-optimal wiring and/or a load capacitor on the bus will most likely lead to input delay values. Introduction. See moreOn an ESP32 delay() is transformed into vTaskDelay() which is a non-blocking delay. Let's say portTICK_PERIOD_MS. do the other actions. I would like to break this second loop when the stop button is pressed. Behind the scenes, the ezLED library employs the millis() function instead of delay to prevent blocking. That's the whole reason of not using delay(). After searching on. Change the default configuration of the Remote host by entering 3333 under the Port number. All without using the delay() function. Learn how to use ezLED library. ESP32 DevKit C. Sparkfun ESP32 Thing. At least one coro must wait on the barrier. More about that later. The ESP8266 server uses the connected router’s IP address. 3 In the callback function of the Timer#1 start Timer #2 with the interval of 1 sec. Which means, reading the timer before and after that function will not give you the adc conversion time. Basically, all that I had to do was add 2 global variables (user_tx_timeout_ms and user_txBufferSize) and changeAn embedded C++ library to control LEDs. But I've run into some problems trying to put the following sketch into a class. I am sending to the client a very long HTML page (51KBytes) and I in addition I steam images from. Show 2 more comments. ESP targets such as ESP32, ESP32-S3, and ESP32-P4 are dual-core SMP SoCs. The Arduino millis () is a timer-based function that returns to you the time elapsed (in milliseconds) since the Arduino board was powered up. Hi, I have several tasks in freeRTOS on my ESP32 delaying with the vTaskDelay-function. This seems to be working but the tcp send call frequently stalls for as much as 2ms when I call it. Can ESP32 use the IP of the previous successful connection for communication after connecting to the router, and in case of failure, re-enter the authentication process and use DHCP to obtain a new IP? ¶To delay overall loop results in serial print monitor so I can keep track of / observe results easily. IotWebConf will start up in AP (access point) mode, and provide a config portal for entering WiFi connection and other user-settings. If the system succeeds in setting your socket non non-blocking, it will be non-blocking. From the IDF documentation: Since the ADC2 module is also used by the Wi-Fi, only one of them could get the preemption when using together, which means the adc2_get_raw () may get blocked until Wi-Fi stops, and vice versa. Reifel but provides some. The value to be filled in timer’s 16 bit register = FFFF – 4C4B= B3B4 H. Configuration of GDB Hardware Debugging - Debugger tab. Timing. I am using an ESP32-WROOM-32 Development Board (30 pin version) with Platformio (CLion version). Re: Non-blocking sockets, select () and transmit buffer size. You need to solder header pins on the GND, DT, SCK, and VCC pins. There's actually a few issues in how the usbcdc functions for the ESP32C3. It is possible to do something similar but in an non-blocking.