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arduino-esp32-led-blink-sdk

This example demonstrates how to integrate with the ESP-IDF SDK via CMake and how to use the Arduino GPIO library to control an LED from Swift. This example is specifically made for the RISC-V MCUs from ESP32 (the Xtensa MCUs are not currently supported by Swift).

Requirements

  • Set up version v5.4 (required for this arduino-esp32 version) of the ESP-IDF development environment. Follow the steps in the ESP32-C6 "Get Started" guide.
    • Make sure you specifically set up development for the RISC-V ESP32-C6, and not the Xtensa based products.
    • If you have a different version of ESP-IDF installed, make sure to also delete ~/.espressif before running install.sh
rm -rf ~/esp-idf ~/.espressif # Remove old installation files
git clone --recurse-submodules https://github.com/espressif/esp-idf.git ~/esp-idf
cd ~/esp-idf
git checkout release/v5.4
git submodule update --init --recursive
./install.sh
idf_tools.py install-python-env
. ./export.sh
  • Before trying to use Swift with the ESP-IDF SDK, make sure your environment works and can build the provided C/C++ sample projects, in particular:
    • Try building and running the "get-started/blink" example from ESP-IDF written in C.

Building

  • Make sure you have a recent nightly Swift toolchain that has Embedded Swift support.
  • If needed, run export.sh to get access to the idf.py script from ESP-IDF.
  • Specify the nightly toolchain to be used via the TOOLCHAINS environment variable and the target board type by using idf.py set-target.
cd arduino-esp32-led-blink-sdk
export TOOLCHAINS=...
. <path-to-esp-idf>/export.sh
idf.py set-target esp32c6
idf.py build

Running

  • Connect the Esp32-C6-Bug board (or any other board with integrated LED on GPIO pin 8) over a USB cable to your Mac. Alternatively you can just connect external LED to GPIO pin 8 on any other board.
  • Connect RX pin of USB-UART converter to TX0 pin of your board if you need serial output. You may also need to connect GND converter pin to the GND pin of the board.
  • Use idf.py to upload the firmware and to run it:
idf.py flash
  • The LED should be blinking now.

Simulating in VS Code

  • Build the project, to generate binaries for simulation
  • Install Wokwi for VS Code.
  • Open the diagram.json file.
  • Click the Play button to start simulation.
  • Click the Pause button to freeze simulation and display states of GPIOs.