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

• Set up 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.

• 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.

• 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 esp32-led-blink-sdk
$ export TOOLCHAINS=...
$ . <path-to-esp-idf>/export.sh
$ idf.py set-target esp32c6
$ idf.py build

• 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 ouput. 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.