feat(boards): Add Glove80 to boards

* Add board definition for MoErgo Glove80

app/boards/arm/glove80/usb_serial_number.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <string.h>
+#include <zephyr/usb/usb_device.h>
+#include <zephyr/drivers/hwinfo.h>
+#include "usb_descriptor.h"
+
+#define LOG_LEVEL CONFIG_USB_DEVICE_LOG_LEVEL
+#include <zephyr/logging/log.h>
+LOG_MODULE_DECLARE(usb_descriptor);
+
+int base16_encode(const uint8_t *data, int length, uint8_t *result, int bufSize);
+
+uint8_t *usb_update_sn_string_descriptor(void) {
+    /*
+     * nrf52840 hwinfo returns a 64-bit hardware id. Glove80 uses this as a
+     * serial number, encoded as base16 into the last 16 characters of the
+     * CONFIG_USB_DEVICE_SN template. If insufficient template space is
+     * available, instead return the static serial number string.
+     */
+    const uint8_t template_len = sizeof(CONFIG_USB_DEVICE_SN);
+    const uint8_t sn_len = 16;
+
+    if (template_len < sn_len + 1) {
+        LOG_DBG("Serial number template too short");
+        return CONFIG_USB_DEVICE_SN;
+    }
+
+    static uint8_t serial[sizeof(CONFIG_USB_DEVICE_SN)];
+    strncpy(serial, CONFIG_USB_DEVICE_SN, template_len);
+
+    uint8_t hwid[8];
+    memset(hwid, 0, sizeof(hwid));
+    uint8_t hwlen = hwinfo_get_device_id(hwid, sizeof(hwid));
+
+    if (hwlen > 0) {
+        const uint8_t offset = template_len - sn_len - 1;
+        LOG_HEXDUMP_DBG(&hwid, sn_len, "Serial Number");
+        base16_encode(hwid, hwlen, serial + offset, sn_len + 1);
+    }
+
+    return serial;
+}
+
+int base16_encode(const uint8_t *data, int length, uint8_t *result, int bufSize) {
+    const char hex[] = "0123456789ABCDEF";
+
+    int i = 0;
+    while (i < bufSize && i < length * 2) {
+        uint8_t nibble;
+        if (i % 2 == 0) {
+            nibble = data[i / 2] >> 4;
+        } else {
+            nibble = data[i / 2] & 0xF;
+        }
+        result[i] = hex[nibble];
+        ++i;
+    }
+    if (i < bufSize) {
+        result[i] = '\0';
+    }
+    return i;
+}