• On the Windows environment, you can use the Flash download tool to download the firmware (The bin file).


    The hardware conditions for the ESP32-C2 chip to enter the “ Download Mode“-LMLPHP

    • Run flash_download_tool.exe
      The hardware conditions for the ESP32-C2 chip to enter the “ Download Mode“-LMLPHP

    • Choose ChipType as ESP32-C2, LoadMode as UART, then press OK.
      The hardware conditions for the ESP32-C2 chip to enter the “ Download Mode“-LMLPHP

    1. Click to select the .bin file to be flashed.
    2. Enter the download address offset for the firmware to be flashed.
    3. Choose the COM port to which the development board is connected.
    4. Click “Start” at the bottom-left corner to begin the flashing process.

The hardware conditions for the ESP32-C2 chip to enter the “ Download Mode“-LMLPHP

  • On the Ubuntu environment, you can use the esptool to download the firmware (The bin file). For example:

    esptool.py -p /dev/ttyUSB0 write_flash 0x0 bootloader.bin 0x8000 partition-table.bin 0x10000 ssc.bin
    

1、The following pins level requirements must be met when the ESP32-C2 series chips need enter the download mode:

VDD -> 3V3 					(The Power Supply)
GND -> GND 					("Common ground" with power supply)
GPIO8 -> pull up			(default floating)
GPIO9 -> pull down 			(default pull up)
EN -> pull up				(Enables the Chip, Do not leave the `EN` pin floating)
TXD0 -> RX
RXD0 -> TX

After ensuring the correct wiring connections, you can proceed with the firmware programming

2、The following hardware conditions must be met for the ESP32-C2 chip to start:

  • The ESP32-C2 chip working voltage range is 3.0 V ~ 3.6 V;f you use a single power supply, the recommended voltage of the power supply for ESP32-C2 family is 3.3 V, and its recommended output current is 500 mA or more.

  • When using ESP32-C2 series Chips, you need require an external 26 MHz crystal oscillator for chip startup. If using the ESP32-C2 series modules , there is no longer need to external starting crystal oscillator. The hardware working conditions of ESP32-C2 chip can refer to the《ESP8684-MINI-1》 page 2


3、Power­on Sequence:

  • The Chip_EN pin can be enabled only after the power supply reaches 50 us after 2.8 V. So when VDD reaches 2.8V, the voltage at EN must not exceed 0.7V. Please refer to the ESP32-C2 Datasheet about "2.3 Power Scheme"

4、If the download fails, Please refer to the following methods for troubleshooting:

  • After the serial port tool is powered on, please pull down the Chip_EN pin and reset it , the serial port will print logs. If print the “waiting for Download” logs , it proves that the chip is in download mode.

    ESP-ROM:esp8684-api2-20220127
    Build:Jan 27 2022
    rst:0x1 (POWERON),boot:0x4 (DOWNLOAD(UART0))
    waiting for download
    
  • After entering the download mode, if the COM port is in waiting for Power-on synchronization state on the “Flash Download Tool” , please check whether the COM port is correctly selected or occupied. And whether the UART0 download interface is correctly connected.


Note:

08-03 16:59