Add waveshare ESP32-S2-Pico

ports/espressif/boards/waveshare_esp32s2_pico/board.cmake

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+# Apply board specific content here
+set(IDF_TARGET "esp32s2")

ports/espressif/boards/waveshare_esp32s2_pico/board.h

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+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Ha Thach (tinyusb.org) for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef WAVESHARE_ESP32_S2_PICO_
+#define WAVESHARE_ESP32_S2_PICO_
+
+//--------------------------------------------------------------------+
+// Button
+//--------------------------------------------------------------------+
+
+#define PIN_BUTTON_UF2        0
+
+//--------------------------------------------------------------------+
+// LED
+//--------------------------------------------------------------------+
+
+
+#define LED_PIN               9
+#define LED_STATE_ON          0
+
+//--------------------------------------------------------------------+
+// USB UF2
+//--------------------------------------------------------------------+
+
+#define USB_VID           0x2E8A
+#define USB_PID           0x101F
+#define USB_MANUFACTURER  "Waveshare Electronics"
+#define USB_PRODUCT       "ESP32-S2-Pico"
+
+#define UF2_PRODUCT_NAME  USB_MANUFACTURER " " USB_PRODUCT
+#define UF2_BOARD_ID      "ESP32-S2-Pico"
+#define UF2_VOLUME_LABEL  "ESP32S2PICO"
+#define UF2_INDEX_URL     "http://www.waveshare.com/wiki/ESP32-S2-Pico"
+
+#endif

ports/espressif/boards/waveshare_esp32s2_pico/sdkconfig

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+# Board Specific Config
+
+# Partition Table
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions-4MB.csv"
+
+# Serial flasher config
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y