# Desert Bus for Hope - RDP Button

This code is intended to run in [MicroPython](https://micropython.org) on the ESP8266EX microcontroller.
You may experience different results running in a different environment.

## Installation

### Preparing your computer

1. Ensure that you have [Git](https://git-scm.com) and [Python](https://www.python.org) installed.
2. Install the `pipenv` virtual environment tool following the [official documentation](https://pipenv.readthedocs.io/en/latest/install).
3. From a terminal, execute the following commands:

```shell
git clone https://code.darkmorford.net/DesertBusForHope/rdp-button.git
cd rdp-button/code
pipenv install
```

This will create a virtual Python environment and install two essential tools:
[esptool](https://github.com/espressif/esptool), used for flashing firmware to the device, and
[ampy](https://github.com/adafruit/ampy), used to manipulate the filesystem.

The Wemos D1 mini requires a driver for Mac OS X to drive the CH340 serial bridge. It can be downloaded [here](https://blog.sengotta.net/signed-mac-os-driver-for-winchiphead-ch340-serial-bridge/).

### Preparing the ESP8266

1. Connect the ESP8266 module to your computer and determine its serial port identifier.
  * For Windows machines, this will be something like `COM1`
  * For Linux/macOS, this will be something like `/dev/ttyUSB0`
2. From this directory (the one containing `Pipfile`), run the following command to clear the ESP8266's flash memory: `pipenv run esptool --port <port> erase_flash`

3. Flash the MicroPython firmware onto the ESP8266. This will vary slightly depending on your board.
  * In most cases, flashing with the default quad-I/O mode will work fine: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect 0 MicroPython/esp8266-20180511-v1.9.4.bin`
  * For some boards, it is necessary to fall back to the dual-I/O mode: `pipenv run esptool --port <port> --baud 460800 write_flash --flash_size detect --flash_mode dio 0 MicroPython/esp8266-20180511-v1.9.4.bin`