boards: add PyPortal to list of supported boards

Signed-off-by: Ron Evans <[email protected]>

Author: deadprogram

content/microcontrollers/pyportal.md

@@ -0,0 +1,83 @@
+---
+title: "Adafruit PyPortal"
+weight: 3
+---
+
+The [Adafruit PyPortal](https://www.adafruit.com/product/4116) is a ARM board based on the Microchip [ATSAMD51J20A](https://www.microchip.com/wwwproducts/en/ATSAMD51J20A) family of SoC.
+
+The PyPortal also has an Espressif ESP32 Wi-Fi coprocessor with TLS/SSL support built-in. PyPortal has a 3.2″ 320 x 240 color TFT with resistive touch screen. PyPortal includes: speaker, light sensor, temperature sensor, NeoPixel, microSD card slot, 8MB flash, plug-in ports for I2C and 2 analog/digital pins,
+
+## Interfaces
+
+| Interface | Hardware Supported | TinyGo Support |
+| --------- | ------------- | ----- |
+| GPIO      | YES | YES |
+| UART      | YES | YES |
+| SPI      | YES | YES |
+| I2C      | YES | YES |
+| ADC      | YES | YES |
+| PWM      | YES | YES |
+
+## Machine Package Docs
+
+[Documentation for the machine package for the Adafruit PyPortal](../machine/pyportal)
+
+## Flashing
+
+### UF2
+
+The PyPortal comes with the [UF2 bootloader](https://github.com/Microsoft/uf2) already installed.
+
+### CLI Flashing on Linux
+
+- Plug your PyPortal into your computer's USB port.
+- Flash your TinyGo program to the board using this command:
+
+    ```shell
+    tinygo flash -target=pyportal [PATH TO YOUR PROGRAM]
+    ```
+
+- The PyPortal board should restart and then begin running your program.
+
+### CLI Flashing on macOS
+
+- Plug your PyPortal into your computer's USB port.
+- Flash your TinyGo program to the board using this command:
+
+    ```shell
+    tinygo flash -target=pyportal [PATH TO YOUR PROGRAM]
+    ```
+
+- The PyPortal board should restart and then begin running your program.
+
+### CLI Flashing on Windows
+
+- Plug your PyPortal into your computer's USB port.
+- Double tap the "RESET" button on the board.
+- Wait until the PyPortal board appears as a flash drive.
+- Flash your TinyGo program to the board using this command:
+
+    ```shell
+    tinygo flash -target=pyportal [PATH TO YOUR PROGRAM]
+    ```
+
+- The PyPortal board should restart and then begin running your program.
+
+### Troubleshooting
+
+If you have troubles getting your PyPortal board to receive code, try this:
+
+- Press the "RESET" button on the board two times to get the PyPortal board ready to receive code.
+- The PyPortal board will appear to your computer like a USB drive.
+- Now try running the command as above:
+
+
+```shell
+tinygo flash -target=pyportal [PATH TO YOUR PROGRAM]
+```
+
+Once you have updated your PyPortal board the first time, after that you should be able to flash it entirely from the command line.
+
+## Notes
+
+You can use the USB port to the PyPortal as a serial port. `UART0` refers to this connection.