# Build the Project

Build the project by running:

    idf.py build

This command compiles the application and all ESP-IDF components, then it generates the bootloader, partition table, and application binaries.

    $ idf.py build
    Running cmake in directory /path/to/hello_world/build
    Executing "cmake -G Ninja --warn-uninitialized /path/to/hello_world"...
    Warn about uninitialized values.
    -- Found Git: /usr/bin/git (found version "2.17.0")
    -- Building empty aws_iot component due to configuration
    -- Component names: ...
    -- Component paths: ...

    ... (more lines of build system output)

    [527/527] Generating hello_world.bin
    esptool.py v2.3.1

    Project build complete. To flash, run this command:
    ../../../components/esptool_py/esptool/esptool.py -p (PORT) -b 921600 write_flash --flash_mode dio --flash_size detect --flash_freq 40m 0x10000 build/hello_world.bin  build 0x1000 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin
    or run 'idf.py -p PORT flash'

If there are no errors, the build finishes by generating the firmware binary .bin files.

# Flash onto the Device

To flash the binaries that you just built for the ESP32-C2 in the previous step, you need to run the following command:

    idf.py -p PORT flash

Replace `PORT` with your ESP32-C2 board's USB port name. If the `PORT` is not defined, the idf.py will try to connect automatically using the available USB ports.

For more information on `idf.py` arguments, see idf.py.

Note

The option `flash` automatically builds and flashes the project, so running `idf.py build` is not necessary.

Encountered Issues While Flashing? See the "Additional Tips" below. You can also refer to Flashing Troubleshooting page or Establish Serial Connection with ESP32-C2 for more detailed information.

## Normal Operation

When flashing, you will see the output log similar to the following:

    ...
    esptool.py esp32c2 -p /dev/ttyUSB0 -b 460800 --before=default_reset --after=hard_reset write_flash --flash_mode dio --flash_freq 60m --flash_size 2MB 0x0 bootloader/bootloader.bin 0x10000 hello_world.bin 0x8000 partition_table/partition-table.bin
    esptool.py v3.3.1
    Serial port /dev/ttyUSB0
    Connecting....
    Chip is ESP32-C2 (revision 1)
    Features: Wi-Fi
    Crystal is 40MHz
    MAC: 10:97:bd:f0:e5:0c
    Uploading stub...
    Running stub...
    Stub running...
    Changing baud rate to 460800
    Changed.
    Configuring flash size...
    Flash will be erased from 0x00000000 to 0x00004fff...
    Flash will be erased from 0x00010000 to 0x0002ffff...
    Flash will be erased from 0x00008000 to 0x00008fff...
    Compressed 18192 bytes to 10989...
    Writing at 0x00000000... (100 %)
    Wrote 18192 bytes (10989 compressed) at 0x00000000 in 0.6 seconds (effective 248.5 kbit/s)...
    Hash of data verified.
    Compressed 128640 bytes to 65895...
    Writing at 0x00010000... (20 %)
    Writing at 0x00019539... (40 %)
    Writing at 0x00020bf2... (60 %)
    Writing at 0x00027de1... (80 %)
    Writing at 0x0002f480... (100 %)
    Wrote 128640 bytes (65895 compressed) at 0x00010000 in 1.7 seconds (effective 603.0 kbit/s)...
    Hash of data verified.
    Compressed 3072 bytes to 103...
    Writing at 0x00008000... (100 %)
    Wrote 3072 bytes (103 compressed) at 0x00008000 in 0.1 seconds (effective 360.1 kbit/s)...
    Hash of data verified.

    Leaving...
    Hard resetting via RTS pin...

If there are no issues by the end of the flash process, the board will reboot and start up the "hello_world" application.

If you would like to use the Eclipse or VS Code IDE instead of running `idf.py`, check out Eclipse Plugin, VSCode Extension.

# Monitor the Output

To check if "hello_world" is indeed running, type `idf.py -p PORT monitor` (Do not forget to replace PORT with your serial port name).

This command launches the IDF Monitor application.

    $ idf.py -p <PORT> monitor
    Running idf_monitor in directory [...]/esp/hello_world/build
    Executing "python [...]/esp-idf/tools/idf_monitor.py -b 115200 [...]/esp/hello_world/build/hello_world.elf"...
    --- idf_monitor on <PORT> 115200 ---
    --- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
    ets Jun  8 2016 00:22:57

    rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
    ets Jun  8 2016 00:22:57
    ...

After startup and diagnostic logs scroll up, you should see "Hello world!" printed out by the application.

        ...
        Hello world!
        Restarting in 10 seconds...
        This is esp32c2 chip with 1 CPU core(s), WiFi/BLE, silicon revision 0, 2 MB embedded flash
    Minimum free heap size: 203888 bytes
        Restarting in 9 seconds...
        Restarting in 8 seconds...
        Restarting in 7 seconds...

To exit IDF monitor use the shortcut `Ctrl+]`.

If IDF monitor fails shortly after the upload, or, if instead of the messages above, you see random garbage similar to what is given below, your board is likely using a 26 MHz crystal. Most development board designs use 40 MHz, so ESP-IDF uses this frequency as a default value.

If you have such a problem, do the following:

1. Exit the monitor.

2. Go back to `menuconfig`.

3. Go to `Component config` --> `Hardware Settings` --> `Main XTAL Config` --> `Main XTAL frequency`, then change CONFIG_XTAL_FREQ_SEL to 26 MHz.

4. After that, `build and flash` the application again.

In the current version of ESP-IDF, main XTAL frequencies supported by ESP32-C2 are as follows:

- 26 MHz

- 40 MHz

Note

You can combine building, flashing and monitoring into one step by running:

    idf.py -p PORT flash monitor

See also:

- IDF Monitor for handy shortcuts and more details on using IDF monitor.

- idf.py for a full reference of `idf.py` commands and options.

That is all that you need to get started with ESP32-C2!

Now you are ready to try some other examples, or go straight to developing your own applications.

Important

Some of examples do not support ESP32-C2 because required hardware is not included in ESP32-C2 so it cannot be supported.

If building an example, please check the README file for the `Supported Targets` table. If this is present including ESP32-C2 target, or the table does not exist at all, the example will work on ESP32-C2.

# Additional Tips

## Permission Denied Issue

With some Linux distributions, you may get the error message similar to `Could not open port <PORT>: Permission denied: '<PORT>'` when flashing the ESP32-C2. This can be solved by adding the current user to the specific group, such as `dialout` or `uucp` group.

## Python Compatibility

ESP-IDF supports Python 3.8 or newer. It is recommended to upgrade your operating system to a recent version satisfying this requirement. Other options include the installation of Python from sources or the use of a Python version management system such as pyenv.

## Flash Erase

Erasing the flash is also possible. To erase the entire flash memory you can run the following command:

    idf.py -p PORT erase-flash

For erasing the OTA data, if present, you can run this command:

    idf.py -p PORT erase-otadata

The flash erase command can take a while to be done. Do not disconnect your device while the flash erasing is in progress.

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