Merge pull request #750 from durapensa/lolin_s2_mini

Lolin S2 Mini board download page updates, features & TinyUF2 flashing instructions

_board/lolin_s2_mini.md

@@ -2,31 +2,77 @@
 layout: download
 board_id: "lolin_s2_mini"
 title: "LOLIN S2 Mini Download"
-name: "LOLIN S2 Mini "
+name: "LOLIN S2 Mini"
 manufacturer: "LOLIN"
 board_url: "https://www.wemos.cc/en/latest/s2/s2_mini.html"
 board_image: "lolin_s2_mini.jpg"
 date_added: 2021-9-3
 features:
   - Wi-Fi
+  - USB-C
 ---
 
 ### Features
 
-- based ESP32-S2FN4R2 WIFI IC
-- Type-C USB
-- 4MB Flash
-- 2MB PSRAM
-- 27x IO
-- ADC, DAC, I2C, SPI, UART, USB OTG
-- Compatible with LOLIN D1 mini shields
-- Compatible with MicroPython, Arduino and ESP-IDF
+- ESP32-S2FN4R2 WiFi SoC
+    - Xtensa® single-core 32-bit LX7 microprocessor, up to 240 MHz
+    - 320 KB SRAM
+    - 4 MB Flash
+    - 2 MB PSRAM
+    - 2 × 13-bit SAR ADCs, up to 20 channels (2 channels not available on ADC2 due to USB)
+    - 2 × 8-bit DAC
+    - 14 × touch sensing IOs
+    - 4 × SPI (2 useable due to embedded flash & psram)
+    - 1 × I2S
+    - 2 × I2C
+    - 2 × UART
+    - 1 × DVP 8/16 camera interface, implemented using the hardware resources of I2S
+    - 1 × LCD interface (8-bit serial RGB/8080/6800), implemented using the hardware resources of SPI2
+    - 1 × LCD interface (8/16/24-bit parallel), implemented using the hardware resources of I2S
+    - 1 × TWAI® controller compatible with ISO 11898-1 (CAN Specification 2.0)
+    - LED PWM controller, up to 8 channels
+    - USB OTG 1.1 controller and PHY, with host and device support
+- USB Type-C connector, for built-in ROM USB bootloader, serial port debugging, and USB device mode
+- 27 × GPIO pins, outer 16 pins compatible with LOLIN D1 mini shields
+- Compatible with CircuitPython, MicroPython, Arduino and ESP-IDF
 - Default firmware: MicroPython
 
 ## Purchase
 
 * [AliExpress](https://www.aliexpress.com/item/1005003145192016.html)
 
+## Learn More
+
+* [Manufacturer Specifications](https://www.wemos.cc/en/latest/s2/s2_mini.html)
+
+### Flashing UF2 Bootloader
+
+***Important***: *this will erase previously flashed firmware & sketches from the board, but needs to be perfomed only once.*
+
+- Download the latest `tinyuf2-lolin_s2_mini-......zip` from [TinyUF2 releases](https://github.com/adafruit/tinyuf2/releases),
+    - Unzip to find the file `combined.bin`.
+- Place board in bootloader mode:
+    - Plug board into a USB port on your computer using a data/sync cable. Make sure it is the only board plugged in, and that a charge-only cable is not being used.
+    - Press and hold the `0` button down. Don't let go of it yet!
+    - Press and release the `RST` button. You should have the `0` button pressed while you do this.
+    - Release the `0` button.
+- Use the Adafruit WebSerial ESPTool to upload `combined.bin` (Google Chrome 89 or newer):
+    - Open a new web browser window or tab to the [Adafruit WebSerial ESPTool](https://adafruit.github.io/Adafruit_WebSerial_ESPTool/).
+    - Select `460800 Baud` from the pull-down menu at the top-right of the page.
+    - Click the `Connect` button at the top-right of the page.
+    - Select the COM or Serial port from the pop-up window.
+    - After successful connection, click the `Erase` button.
+    - After successful erase, click the first `Choose a file...` button, locate the `combined.bin` file unzipped earlier, click `Ok`.
+    - After successfully choosing the `combined.bin` file, click the `Program` button.
+    - After the TinyUF2 firmware update is complete, press the `RST` button on the board. A new drive `S2MINIBOOT` should be visible in your file browser.
+
+### Flashing CircuitPython
+
+- Flash the UF2 bootloader using the instructions above.
+- Download the `.UF2` file from this page.
+- In your file browser, Drag & Drop the `.UF2` file to the `S2MINIBOOT` drive.
+- Your board should reboot automatically into CircuitPython. The `S2MINIBOOT` drive should disappear and be replaced with a new drive `CIRCUITPY`.
+
 ## Contribute
 
 Have some info to add for this board? Edit the source for this page [here](https://github.com/adafruit/circuitpython-org/edit/master/_board/{{ page.board_id }}.md).