samd/boards/SEEED_XIAO: Add new board definition.

ports/samd/boards/SEEED_XIAO/board.json

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+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "USB-C"
+    ],
+    "images": ["seeeduino-xiao.jpg"],
+    "mcu": "samd21",
+    "product": "Seeeduino XIAO",
+    "thumbnail": "",
+    "url": "https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html",
+    "vendor": "Seeed Studio"
+}

ports/samd/boards/SEEED_XIAO/mpconfigboard.h

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+#define MICROPY_HW_BOARD_NAME "Seeed Xiao"
+#define MICROPY_HW_MCU_NAME   "SAMD21G18A"
+
+// MicroPython configs
+// samd_flash.c flash parameters
+// Build a 64k Flash storage at top. 256k-64k=196k
+// 256*1024=262144 minus 64*1024=65536 = 196608 = 0x30000
+#define MICROPY_HW_FLASH_STORAGE_BASE       (0x30000)
+#define MICROPY_HW_FLASH_STORAGE_BYTES      (0xFFFF)
+#define VFS_BLOCK_SIZE_BYTES                (1536) // 24x 64B flash pages;
+
+// ASF4 MCU package specific Pin definitions
+#include "samd21g18a.h"
+
+// Please consult the SAM_D21 Datasheet, I/O Multiplexing and Considerations.
+// XIAO_M0 USART pin assignments: Tx=A6=PB8=SERCOM4/PAD[0], Rx=PB9=A7=SERCOM4/PAD[1]
+#define CPU_FREQ (48000000) // For selecting Baud from clock.
+#define MP_PIN_GRP 1 // A=0, B=1
+#define MP_TX_PIN 8 // 'n'
+#define MP_RX_PIN 9
+#define MP_PERIPHERAL_MUX 4 // 'n'th group of 2 pins
+#define USARTx SERCOM4 // SERCOM4:XIAO_M0 tx/rx
+#define MP_PORT_FUNC 0x33 // Sets PMUXE & PMUXO to the Alternative Function.A-H=0-7
+#define MP_RXPO_PAD 1 // RXPO- Receive Data Pinout
+#define MP_TXPO_PAD 0 // TXPO- Tranmit Data Pinout
+#define MP_SERCOMx SERCOM4_ // APBCMASK
+#define MP_SERCOM_GCLK_ID_x_CORE GCLK_CLKCTRL_ID_SERCOM4_CORE // Generic Clock Control

ports/samd/boards/SEEED_XIAO/mpconfigboard.mk

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+MCU_SERIES = SAMD21
+CMSIS_MCU = SAMD21G18A
+LD_FILES = boards/samd21x18a.ld sections.ld
+TEXT0 = 0x2000
+
+# The ?='s allow overriding in mpconfigboard.mk.
+# MicroPython settings
+MICROPY_VFS_LFS1 ?= 1
+

ports/samd/boards/SEEED_XIAO/pins.c

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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Peter van der Burg
+ *
+ * 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.
+ *
+ * Used by machine_pin.c. Holds Board/MCU specific Pin allocations.
+ */
+
+#include "modmachine.h"
+#include "pins.h"
+
+// Ensure Declaration in 'pins.h' reflects # of Pins defined here.
+const machine_pin_obj_t machine_pin_obj[] = {
+    {{&machine_pin_type}, PIN_PA02}, // A0/D0
+    {{&machine_pin_type}, PIN_PA04}, // A1/D1
+    {{&machine_pin_type}, PIN_PA10}, // A2/D2
+    {{&machine_pin_type}, PIN_PA11}, // A3/D3
+    {{&machine_pin_type}, PIN_PA08}, // A4/D4
+    {{&machine_pin_type}, PIN_PA09}, // A5/D5
+    {{&machine_pin_type}, PIN_PB08}, // A6/D6
+    {{&machine_pin_type}, PIN_PB09}, // A7/D7
+    {{&machine_pin_type}, PIN_PA07}, // A8/D8
+    {{&machine_pin_type}, PIN_PA05}, // A9/D9
+    {{&machine_pin_type}, PIN_PA06}, // A10/D10
+};
+
+const machine_led_obj_t machine_led_obj[] = {
+// XIAO: Just the available LED Pins: User LED (PA17), Rx & Tx.
+    {{&machine_led_type}, PIN_PA17}, // W13
+    {{&machine_led_type}, PIN_PA18}, // RX_LED
+    {{&machine_led_type}, PIN_PA19}, // TX_LED
+};

ports/samd/boards/SEEED_XIAO/pins.h

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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Peter van der Burg
+ *
+ * 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.
+ *
+ * Used by machine_pin.c & board specific pins.c. Holds Board/MCU specific Pin
+ * allocations.
+ */
+
+typedef struct _machine_pin_obj_t {
+    mp_obj_base_t base;
+    uint32_t id;
+} machine_pin_obj_t;
+
+typedef struct _machine_led_obj_t {
+    mp_obj_base_t base;
+    uint32_t id;
+} machine_led_obj_t;
+
+// MUST explicitly hold array # of rows, else machine_pin.c wont compile.
+extern const machine_pin_obj_t machine_pin_obj[11];
+extern const machine_led_obj_t machine_led_obj[3];