To buld the ESP32 firmware:

1. Install the ESP32 toolchain for your OS. You do not need to install the ESP-IDF -- that happens automatically in the$

• For Linux: https://esp-idf.readthedocs.io/en/v3.1-beta1/get-started/linux-setup.html
• For Windows: https://esp-idf.readthedocs.io/en/v3.1-beta1/get-started/windows-setup.html
• For OSX: https://esp-idf.readthedocs.io/en/v3.1-beta1/get-started/macos-setup.html

2. Pull in the ESP-IDF, MicroPython, and other dependencies: git submodule update --init --recursive

3. Build mpy_cross: cd firmware/esp32/components/micropython/micropython/mpy-cross/ && make && cd ../../../..

4. Optionally configure the serial port that your badge appears on (under Serial Flasher Config): make menuconfig

5. Build it: make -j5

6. Flash it: make flash OR

python esptool/esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size detect 0x1000 bootloader.bin 0x10000 cpv2017.bin 0x8000 partitions.bin

you may need to replace /dev/ttyUSB0 with /dev/ttyACM0 or whatever serial device the badge is listed as.

You can edit the build configuration with (includes wifi creds):

make menuconfig

SD Card contents can be found: https://2017.badge.cryptovillage.org/sdcard/0.3-prerel.zip

If your device is showing "TEST MODE", the EFM8 needs to be flashed. We've found that this only works from a Windows computer or Virtualbox with the Extension Pack for USB devices. If using a VM, we found that the IE11 Win7 testing VM from MicroSoft worked. You will need to install the driver from: https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers

Download the flashing tools here: https://2017.badge.cryptovillage.org/W18779AXC7/TestFlash.zip

The prebuilt firmware can be found here: https://2017.badge.cryptovillage.org/firmware/v0.9/

You need to replace esp32test.bin with cpv2017.bin, and partitions_singleapp.bin with partitions.bin in TestFlash after unzipping. (Keeping the original filenames from TestFlash.zip contents but replacing the file content)

Hold down the knob when plugging the device in to put the device into a mode to flash the EFM8. The LEDs should not turn on and the screen will be blank and dim.

Run efm8load.exe to flash the EFM8. The device should reboot, but may require replugging in the USB cable. It should now appear as a serial device.

Then run NodeMCU-PyFlasher.exe to flash the ESP32.