add/test support for the Ugly board:

http://wiki.stm32duino.com/index.php?title=Ugly_board

Most, if not all, devices in the STM32 family support flashing via a serial connection. Flashing over serial is also suported by the texane/stlink tool.

Flashing over serial works by starting the device in its bootloader mode and connecting it to a PC via an USB to serial converter. For the Blue Pill, connect converter TxD to board RxD (PA10) and connect converter RxD to board TxD (PA9).

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Hello!
I use the same UART channel to read data from sensor (via RX pin of controller) and send debug messages (via TX pin). So there is no connection between controller's TX pin and sensor's RX pin.
In my case PMS5003 sensor works fine without sending any command to it.
Your library sends "passive mode" command in 'init' and 'trigRead' methods:
uart->write(cfg, msgLen); // set passive mode

Add a programming guide to the docs.

Contents:

• Explain how the Blink example in the templates works
• Introduce the CMSIS
• Explain how to use the official docs (datasheets, references, programming manuals, etc...)

Hi Rick,

I am trying to follow your instructions to create a custom board based on the STM32 Arduino core. Using the files that's provided in this repo, the arduino-builder throws a panic and even after reading the docs and experimentation, I still can't figure out the cause. I was hoping that you could provide a hint or clue.

Details:

• OS: Windows 10
• Arduino 1.8.10
• STM32 Arduino Cor