Esp32 bootstrap pins

Esp32 bootstrap pins. It means that in the scenario of the XYZ Dec 18, 2023 · I am using the ESP32-S3 and would like to ask if there is any chance to permanently skip the download mode if the strapping pins are set? I was thinking of setting the fuse bits, but idk if there is any appropriate fuse for this. So with: - 3. Nov 13, 2015 · ESP_igrr Posts: 2067 Joined: Tue Dec 01, 2015 8:37 am Re: ESP32-D2WD with PSRAM32 , SPI Flash , free Pins - rules to be noted - May 23, 2022 · I recently designed a new Board and due reasons of availability I had to choose the ESP32-S2-Mini-1. Hi, Jan 31, 2019 · Dear community, I tryed to design ESP-WROOM-32 (just pure module, not dev. 3v. Jul 27, 2021 · Up to a certain point, you can use bootstrap pins as generic GPIOs; you just need to make sure that they always have the correct value on bootup or reset. With this guide, you’ll learn how to properly use the According to the ESP32 datasheet, the latching of the strapping pins is done during chip power-on reset and these bits are held until the chip is powered down or shut down. Most of the I/O pins are broken out to the pin headers on both sides for easy interfacing. The bootstrap pins can be used after the boot process ends. Feb 22, 2023 · Re: ESP32-C6 Pin Selection Support. I have question about strapping pins of the ESP32-WROOM-32E. When using the ESP32 with the Arduino IDE, the default I2C pins are: GPIO 21 (SDA) GPIO 22 (SCL) If you want to use other pins when using the wire library, you just need to call:Wire. MOSI - This is the SPI Microcontroller Out / Sensor In pin. 2) GND = all GND pins tied to GND. Extra. I found the option of the "Disable ROM Download Mode" but as I have read it still stay inside, but prints an error? Apr 24, 2023 · Touch0 and touch1 are GPIO0 and GPIO4. First Steps on ESP-IDF. Only GPIO 18,26,45 and 46 are unused and floating. The previous content of the wiki was moved to the official documentation. The ESP32 board features a built-in hall effect sensor located behind the metal lid of the ESP32 chip as shown in the following figure. Software can read the value of these 6 bits from the register ”GPIO_STRAPPING”. My Application is using almost all GPIO pins. 3 V (stable voltage, checked with Oszi) - GND. The document is structured as follows: Introduction to the purpose of this guide. bootup into normal mode or downloader mode was fine, using the simple jumper to pull IO0 The ESP32 chips have a GPIO matrix that allows you to route most peripherals (like I2C) to any available GPIO pin. The ESP8266 12-E chip comes with 17 GPIO pins. Post by Seungwhan » Thu Sep 05, 2019 1:27 am . Slaves should also have pull-ups on all above-mentioned lines (regardless of whether these Oct 9, 2016 · Hence, if you make it high, all the normal power-on things kick in: the power-on reset activates, the crystal oscillator starts up, and after the crystal oscillator is stable, the bootstrap pins get sampled. Because the hardware is already released we would like to Bootstrap is a small breakout board that allows you to access the Reset, Bootloader, and Ground pins of an ESP32 or S2 module in one bus. Home. 3V. Warning. Inside that folder, you should place the HTML, CSS, and JavaScript files. 3. The ESP32-S3 is a highly-integrated, low-power, 2. Startup code called from the reset vector determines the boot mode by checking GPIO_STRAP_REG register for bootstrap pin states. Depending on the reset reason, the following takes place: GPIO Matrix and Pin Mux. Espressif ESP32 Official Forum. 1 PinLayout 12 2. The ESP is only connected to the most necessary pins. Today, I received my Arduino Nano ESP32 which is an ESP32 S3. • GPIO5: internal pull-up. Although not strictly necessary as I have made boards without a pullup, I would recommend it. I2C on 6/7; LED on pin 8 (use setStatusLight to control); Serial logging on pin 21 at 115200 8N1; Service: buttonBOOT (button) ESP32-DevKitC V4 is a small-sized ESP32-based development board produced by Espressif. Jul 19, 2019 · 1) VDD = tied to 3. The advantage of using this chip is that it is very powerfull, rich of functions and at the same time it is cheap. Go to Sketch > Show Sketch Folder, and create a folder called data. Additionally: the C3 has a built-in USB-to-serial-JTAG converter; you could do both JTAG as well as serial flashing & debugging by connecting GPIO 18&19 to a PC. The Metro ESP32-S3 comes with a MicroSD card slot. Nov 18, 2018 · Espressif ESP32 Official Forum. Jan 6, 2024 · ESP32 Pinout. Or, what I'd suggest in your case: grab an ESP8266 (or ESP32) module with more GPIOs and use pins that are not bootstrap pins. daniSi. Hello, I have a problem booting from ESP32 (ESP32-WROOM-32E-N8). bin 0x10000 verify exit". The SDIO Slave mode is used when driving the ESP32 as a peripheral over an SDIO bus from an embedded host (in this Apr 20, 2020 · D2WD Bootstrap to use Embedded flash Post by Brento » Mon Apr 20, 2020 8:24 pm I have GPIO12 pulled high through a 10k resistor, and I believe I have followed the various other documented pin rules when enabling usage of the embedded flash on this chip. it off by pulling a bootstrap pin GPIO15 esp32/advanced-topics/boot I understand that several pins are sampled upon EN (ie Resetn) going high on powerup. Essentially, this capability means that we can route the internal peripheral into a different physical pin using the IO MUX and the GPIO Matrix. Although the ESP32 has 48 GPIO pins in total, only 25 of them are broken out to the pin headers on both sides of the development board. Contribute to espressif/esptool development by creating an account on GitHub. 4V, 0-2V, or 0-4V. I2C. 8 V, right? ESP32-C3 SuperMini. 3V to 5V) to ensure proper functioning of the board. The greater the magnetic field, the greater the sensor’s output voltage. The chip should be activated after the power rails have stabilized. TEST 2: Position Control Mode with . 2 GPIOs – used for RxD and TxD, may be re-used. Dec 15, 2017 · ESP32 uses a 3. The ESP32 series employs a Tensilica Xtensa LX6 microprocessor in both dual-core and single-core variations. The problem is we use the strapping pins with some peripheral device which in some edge cases cause the pin stay low at power up which means the esp doesn't go to normal boot. Together these modules provide highly Apr 15, 2022 · some GPIOs emit a PWM signal which can affect the connected circuits; some GPIOs cannot be pulled high / low otherwise boot fails. 4) IO0 = jumper to flip between being pulled up via 10k to 3. Jan 29, 2023 · As a general summary, the GPIOs on the ESP32-C3 can be summarized as follows: 10 GPIOs – completely flexible. This simple add-on board comes in two flavours, ESP32 and ESP32S2, with both types straddling the ESP to break out the pins to through hole copper pads. As discribed in the Subject, I found something odd, the ESP won't exit Download mode as long GPIO 2 is pulled to GND. Nov 13, 2015 · Re: ESP32-D2WD with PSRAM32 , SPI Flash , free Pins - rules to be noted - Post by ESP_igrr » Wed Apr 19, 2017 1:48 pm if we use ESP32-D2WD with embedded Flash we need to be noted that the memory used 1. But than I can not upload the code because of data packet errors. 4. 2 Pins 12 2. Got it. I have a regular ESP32-C3-WROOM-02-H4 module on a simple replica dev landing board. See About Nano ESP32 boards with inverted green and blue pins. Through GPIO matrix and IO MUX, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Not all GPIOs are exposed in all ESP8266 development boards, some GPIOs are not recommended to use, and others have very specific functions. 3V output. • GPIO0: internal pull-up. Boot Mode Selection. Jun 8, 2022 · I am desiging a PCB that includes an ESP32. Features . When an SD card is operating in SPI mode or 1-bit SD mode, the CMD and DATA (DAT0 - DAT3) lines of the SD bus must be pulled up by 10 kOhm resistors. I need a circuit to disable these pins during bootstrap and to enable them during code execution. If you want to connect a switch button to enter the boot mode, this has to be a strong pull-down. Roland Dobai edited this page on Nov 25, 2021 · 2 revisions. Looking at the datasheets, it apperas that by ESP32-S3 WiFi Module. g. Most of the I/O pins on the ESP32-C3-MINI-1 module are broken out to the pin headers on both sides of this board for easy interfacing. py monitor. - EN is connected to 3. May 6, 2019 · This article is a guide for the ESP8266 GPIOs: pinout diagrams, their functions and how to use them. The ESP32 module comes in various variants, but we will focus on the commonly used ESP-WROOM-32 module, which offers 38 GPIO pins. I'm not sure what would cause GPIO4 to not work, but there may be a similar thing going on, depending on what devboard you use. Apr 8, 2023 · You'd do it by taking the values those bootstrap pins need to be at boot into account, e. 3) EN = pulled up via 10k resistor to 3. One method used frequently in situations like this is to degate the bootstrap levels when Resetn(EN) is released. SD pull-up requirements apply to cases where ESP32 uses the SPI controller to communicate with SD cards. I used pins 21 (GPIO7) and 22 (GPIO8). G. See the ESP32S3 TRM; if you enable that efuse, you should be able to use GPIO3 as a bootstrap pin to switch between the two. The ESP32-C3 has a 45k ohm internal pull-up/pull-down resistor at GPIO9 (and other pins). We make projects with: ESP32, ESP8266, Arduino, Raspberry Pi, Home Automation and Internet of Things. Jan 29, 2024 · Except for the bootloader reset procedure, the B1 and B0 pins are recommended to use only for outputs to avoid unexpected behavior when resetting the board. Why did you make it? I made this because one of my ESP boards is Arduino form factor and the display shield covers the DFU button. 1 IOMUXandGPIOFunctions 17 ESP32-C3TechnicalReferenceManual>ChapterIOMUXandGPIOpins. In other words: pick two convenient GPIO pins, make sure they're not otherwise occupied (flash connected to them, bootstrap pins etc), and you can use them as your I2C pins. This guide explains how to select the boot mode correctly and describes the boot log messages of ESP32-S2. You probably want to hit EFUSE_DIS_USB_JTAG if you want to permanently switch to external JTAG. Jan 27, 2024 · These pins serve as gatekeepers, influencing critical parameters during startup or reset, such as boot mode, voltage selection, JTAG signal source, and more. Developers can either connect peripherals with jumper wires or mount ESP32-DevKitC V4 on a breadboard. Depending on the reset reason, the ESP32-C3-DevKitM-1 is an entry-level development board based on ESP32-C3-MINI-1, a module named for its small size. Seungwhan Posts: 19 Joined: Mon Jul 29, 2019 11:23 pm. Feb 27, 2023 · UPDATE 8/16/2023: Arduino Nano ESP32. Thus, the configuration of the bootstrap pins for timing of SDIO slave have no effect on the serial flash interface, or the rest of the processor Dec 18, 2023 · Re: ESP32-S3 boot mode. 3 posts • Page 1 of 1. ESP32 is created and developed by Espressif Systems, a Shanghai-based Chinese company, and is manufactured by TSMC Random Nerd Tutorials helps makers, hobbyists and engineers build electronics projects. 2 UART Mar 12, 2024 · There are three power pins on the ESP32 board: Vin (Voltage IN): This pin is used to connect an external power supply to the ESP32 board. Just were thinking about them both. 3V system power supply. 8 V, right? Mar 27, 2019 · ESP32 Boot Mode Selection. ESP32 has 6 strapping pins: • MTDI/GPIO12: internal pull-down. Some of them are used by special SoC components, e. After reset, IO2 is set as input and in an high impedance state. Across different ESP32 versions, certain common strapping pins persist, each with its unique functions and default configurations. Guide to selecting boot mode correctly on ESP32. You can also debug your ESP32 without needing to setup JTAG or OpenOCD by using idf. 5 The ESP32-C6 chip features 31 physical GPIO pins (GPIO0 ~ GPIO30). Sep 29, 2017 · 1) The serial flash uses the same 6 physical pins (GPIO's 6-11) as the SDIO interface, but does not use the SDIO interface itself. Another option is to write application image to flash using OpenOCD via JTAG with commands like this: openocd -f board/esp32-wrover-kit-3. Home; Quick links. Each pin can be used as a general-purpose I/O, or to be connected to an internal peripheral signal. Dec 18, 2023 · Re: ESP32-S3 boot mode. im going to gate a bootsrap-time pullup/pulldown onto the GPIO12 with a 74LVC1G125 using EN (RESETn) as its enable. This guide explains how to select the boot mode correctly and describes the boot log messages of ESP32. Information about ESP32 strapping pins can also be found in the ESP32 Datasheet, section 2. More fully using SDIO/bootstrap pins -- any good examples? The ESP32 has plenty of features, but some of them are not immediately accessible because the pins are used for the initial program loading via the SDIO interface and because some of the pins are reserved for JTAG/bootstrap purposes. The ESP32 has two I2C channels and any pin can be set as SDA or SCL. Unfortunately, I have to connect GPIO15 (MTDO) to GND with my pull down resistor (30kOhm) to disable a few elements initially passive for power consumption. Jul 19, 2023 · After inserting your network credentials, save the code. Usually, that takes a ms or so, but I assume it will vary with the crystal specifics. Add section on JSON files and Arduino JSON to store data related to WiFi settings and the state of each individual relay. To cover a wide range of user requirements, the following Dec 18, 2023 · It would be a nice feature to enable/disable those bootstrap pins. 3V3: This pin provides a regulated 3. E. by designing your schematic so that the 'normal' level of those pins is high. I am using UART and boot mode to upload Arduino code into ESP32. • GPIO4: internal pull-down. Jun 24, 2019 · June 24, 2019, 11:24:16 AM. Check the datasheet for the flash pins and don't use them, also check them for bootstrap pins and see if the restrictions on those are an issue. The voltage supplied through this pin should be within the recommended range (3. With its state-of-the-art power and RF performance, this SoC is an ideal Feb 22, 2023 · Re: ESP32-C6 Pin Selection Support Post by ESP_LJH » Thu Feb 23, 2023 6:54 am Hello, I think in the module datasheet, 3. 15 channels of 12-bit SAR ADC with selectable ranges of 0-1V, 0-1. The following table gives a short overview. This document provides a guide to installing OpenOCD for ESP32 and debugging using GDB. Add section on AJAX requests and Websockets in place of straight GET requests. After SoC reset, the CPU will start running immediately to perform initialization. 3v or pulled down via 10k to GND (for flashing) 5) IO2 = IO0 = pulled to GND via 10k resistor. A hall effect sensor can detect variations in the magnetic field in its surroundings. is achieved by delaying the activation of CHIP_PU (Pin9) by time T after the 3. ESP8266EX and ESP32 are some of our products. Upload Application for Debugging. Together these modules provide highly Nov 25, 2021 · Home. If you want to learn electronics and programming, you're in the right place. 3 strapping pins, you could see not only which are strapping pins and also how some modes are controller by them. If there is any change this would be great. MOSI/GPIO42 - This is the SPI M icrocontroller O ut / S ensor I n pin. The GPIO12 and its conflict with the 4-bit SDCARD DATA2 almost bit me. In the datasheet (Section 2. begin(SDA, SCL); May 27, 2022 · Postby jb-mtd » Fri May 27, 2022 4:18 pm. 5. Similar to I2C, the ESP32 allows flexible pin assignment for SPI. (I don't have to pull up GPIO2 at all) The ESP32 chips have a GPIO matrix that allows you to route most peripherals (like I2C) to any available GPIO pin. 3. On some Nano ESP32, the green and blue pins are inverted. Register Bootstrap pin - MTDO. GPIO0 is a bootstrap pin and probably has the boot button plus a pullup resistor (plus the logic of an autoreset circuit) attached that messes with the touch detection. This is the ESP32-S3 module. This. 3 GPIOs – flexible but must be ‘high’ on reset because they Sep 7, 2022 · The strapping pins GPIO0 and GPIO45 are pulled up by external resistors. The short answer is that you can probably ignore the "SDIO Slave" strapping choice. Aug 29, 2019 · The ESP32 Hall Effect Sensor. ↩︎. 3 IOPins 17 2. The. The UART interface. My design is suitable below picture only for GPIO 0,GPIO 12,GPIO2 pins. to/3mFyaLr. I copied the C3 dev board schematic. D2WD Bootstrap to use Embedded flash Post by Brento » Mon Apr 20, 2020 8:24 pm I have GPIO12 pulled high through a 10k resistor, and I believe I have followed the various other documented pin rules when enabling usage of the embedded flash on this chip. Espressif SoC serial bootloader utility. Should work, IF the Tsetup and Tdelay timings for the ESP32 are met. Mar 31, 2023 · The ESP32 chips have a GPIO matrix that allows you to route most peripherals (like I2C) to any available GPIO pin. Users browsing this forum: No registered users and 51 guests. This breakout allows me to get the pins I need directly. This board integrates complete Wi-Fi and Bluetooth® Low Energy functions. board) myself. Hi, I have connected 32. Postby daniSi » Tue Dec 19, 2023 6:41 am. For reference design, please refer to. Pages 1. , as touch sensors. FAQ; Forum. 6. MISO/GPIO21 - This is the SPI M icrocontroller I n / S ensor O ut pin. Postby jalexoid » Fri Jul 22, 2022 12:13 am. 6 Strapping Pins ↩︎. This guide explains how to select the boot mode correctly and describes the boot log messages of ESP32-C3. ESP32-C3-DevKitM-1 is an entry-level development board based on ESP32-C3-MINI-1, a module named for its small size. Add relay control function to our requests. Clone this wiki locally. This means that any GPIO pin can be configured as SPI pins. The ESP32 has a 45k ohm internal pull-up/pull-down resistor at GPIO0 (and other pins). However, unless I pull up GPIO8 - the bootloader doesn't go into serial mode. Dec 23, 2021 · Re: ESP32-S3 USB-JTAG. Hi, The ESP32-WROOM-32 module features three SPIs (SPI, HSPI, and VSPI). Postby dgduncan » Sun Jan 23, 2022 1:09 am. Mar 1, 2024 · I know there are many precautions around other ESP32 SoCs because sometimes the SPI flash is connected and some pins are used for strapping. Postby ESP_LJH » Thu Feb 23, 2023 6:54 am. The problem start when I tryed to add MCP3221 (12bit I2C AD Converter). LEDs attached to GPIOs can't affect the bootstrap levels so no problems to use them. Some of them are used by special SoC components. Yep, hence my (not otherwise used/assigned) remark. HSPI and VSPI are commonly used for general purposes, while the third one is used for interfacing with the SPI flash memory integrated on the module. 768 kHz crystal to pins 32 and 33 and to GND. It comes with integrated Wi-Fi and Bluetooth connectivity, making it suitable for a wide range of IoT applications that require wireless connectivity. The core board supports UART, GPIO, SPI, I2C, ADC, PWM and other interfaces, which can be selected according to actual needs. ESP32 integrates a dual core ARM processor and has a built-in WiFi and Bluetooth modules, with also BLE. I've selected "External 32kHz crystal" in menuconfig and left "Number of cycles for RTC_SLOW_CLK calibration" and "Bootstrap cycles for external 32kHz crystal" with default values (1024 and 5). - IO0 is connected to GND for flashing. Skip to content. This circuit should be controlled by a high/low signal from one of the "bootstrap-safe" pins of the ESP32. 4 GHz Wi-Fi System-on-Chip (SoC) solution that now has built-in native USB as well as some other interesting new technologies like Time of Flight distance measurements. • MTDO/GPIO15: internal pull-up. • GPIO2: internal pull-down. Below is the detailed description of the ESP32 Nov 13, 2015 · Re: ESP32-D2WD with PSRAM32 , SPI Flash , free Pins - rules to be noted - Post by ESP_igrr » Wed Apr 19, 2017 1:48 pm if we use ESP32-D2WD with embedded Flash we need to be noted that the memory used 1. Aug 16, 2022 · The SPI pins are on the ESP32-S3 high-speed peripheral. The ESP32-C6 chip features 31 physical GPIO pins (GPIO0 ~ GPIO30). 4 "Strapping Pins". MISO - This is the SPI Microcontroller In / Sensor Out pin. Dec 18, 2023 · It would be a nice feature to enable/disable those bootstrap pins. ESP32 is the successor of the popular ESP8266 chip, and it offers a lot more capabilities and functionality. Apr 14, 2021 · Paarhaas was using display modules with ESP32 and ESP32S2 microcontroller projects and they obscured the reset, bootloader and ground pins, so he created the Bootstrap as a way to regain access. Hi, Reset vector code is located in the mask ROM of the ESP32-S3 chip and cannot be modified. ESP32-S3 Series Datasheet – 2. On many development boards with built-in USB/Serial, this is all done for you and esptool. It's a little confusing, but the MTDO pad influences both. RX - This is the UART Jun 10, 2023 · Hi there I'm monitoring my ESP32 with a rate of 921600, but in restarts it prints garbage. 2 PinOverview 14 2. A super tiny ESP32-C3 board. Mar 2, 2023 · ESP32 is a dual-core SoC with two powerful Xtensa LX6 CPUs that run at up to 240 MHz. So switching back and forth is not possible. The board edge is designed with stamp holes, which is convenient for developers to use in different scenes. It is wired up for SPI interfacing. For this reason, the pull state of particular pins on certain products will need to be adjusted to provide the pull-ups required in the SD bus. PU/PD: these pins have software configurable pull-up/pull-down May 13, 2024 · ESP32-C3 has 22 GPIO pins, where a subset can be used as ADC channel and as low-power digital input/output in deep-sleep mode, the so-called RTC GPIOs. The ESP32 architecture includes the capability of configuring some peripherals to any of the GPIOs pins, managed by the IO MUX GPIO . Postby ESP_Angus » Wed Oct 05, 2016 2:47 am. 7 GPIOs – shared with flash, 2 can be saved with DIO external flash, 1 more can be saved with external flash power. recommended delay time (T) is given by the parameter of the RC circuit. Build and upload your application to ESP32 as usual, see Step 5. 3V for flashing. You can set any pins to be the low-speed peripheral but you won't get the speedy interface! SCK - This is the SPI clock pin. On the Nano ESP32, Serial0 is accessible via Pins (RX0, TX1), see picture below whereas I hooked up a BT-210 to Serial0: And I can make Serial0 work fine with TASK2 Output Monitor. Learn how to use ESP32 PWM with Arduino IDE: ESP32 PWM with Arduino IDE. But in my experiment, the level on these strapping pins also affect the boot mode during RTCWDT_RTC_RESET. Postby ESP_Sprite » Mon Jan 17, 2022 8:54 am. Upload those files to the filesystem: go to Tools > ESP32 Data Sketch Upload and wait for the files to be uploaded. These pins can be assigned a variety of peripheral duties, including: 15 ADC channels. Jul 22, 2022 · ESP32-C3 Serial Bootloader and strapping pins. AFAIK, it's the ROM bootloader that samples the strapping pins after reset and enters download mode - or not, if the efuse is blown. Add section on the ESP32 File Structure and where files live. Jun 1, 2023 · ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi & dual-mode Bluetooth. Oct 4, 2016 · Re: strapping Pin clarification. For example a 10k resistor to GND. If you don't have micro SD card, then probably you can use the following: GPI00, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO13, GPIO14, GPIO15, GPIO16, GPIO32, and GPIO33. The reset vector code is located in the mask ROM of the ESP32-C3 chip and cannot be modified. Because the hardware is already released we would like to ESP32 Peripherals and I/O. May 13, 2024 · ESP32 has 34 GPIO pins, where only a subset can be used as output, as ADC channel, as DAC channel and as GPIOs in deep-sleep mode, the so-called RTC GPIOs. Sep 5, 2019 · Bootstrap pin - MTDO. 3V rails have been brought up. 5), GPIO 0 and GPIO 45 are documented to be both during and after reset in the configuration E1, WPU1 and IE1, WPD1 respectively. TEST 1: RC100 via Serial0. When an SD card is operating in SPI mode or 1-bit SD mode, the CMD and DATA (DAT0 - DAT3) lines Feb 26, 2019 · I realize that they are different bootstrapping pins. Table 6 is boot mode control, it says when GPIO8 is high and GPIO9 is low, C6 will enter into download mode. py can automatically reset the board into bootloader mode. Hello, I think in the module datasheet, 3. Mar 10, 2017 · According to the ESP32 datasheet, the latching of the strapping pins is done during chip power-on reset and these bits are held until the chip is powered down or shut down. CORE ESP32 The core board is a core board designed based on Lexin ESP32-C3, with a size of only 21mm * 51mm. PU/PD: these pins have software configurable pull-up/pull-down functionality. cfg -c "program_esp filename. The ESP32-S2 has a 45k ohm internal pull-up/pull-down resistor at GPIO0 (and other pins). See: IDF Monitor and CONFIG_ESP_SYSTEM_GDBSTUB_RUNTIME. Jul 13, 2023 · re: esp32-c6-devkitc-1-n8 spi pins Post by ESP_Sprite » Fri Jul 14, 2023 5:25 am Yes, all those GPIOs should be generally available (but watch out for any bootstrap pins). Sep 17, 2021 · Re: Strapping pins (vz GPIO2) on C3. To access the SD card, use the following pins: SCK/GPIO39 - This is the SPI clock pin. The serial flash uses the quad SPI interface via the SPI0 module. You can buy one at this link: https://amzn. I see several discussion threads about BOOT(GPIO12) and the fact that it has to be pulled high for some modules and low for other variants. fz vg dy ur qv ks hg jc fi fg