update README.md

DEVICE_NAME must be 8 chars or less, otherwise the Nordic DFU service UUID is silently dropped from the BLE advertising packet which has the potential to cause issues with some DFU apps.

README.md

@@ -1,5 +1,16 @@
 # Adafruit nRF52 Bootloader with Enhanced OTA DFU
 
+## Changes in OTAFIX 2.2
+
+- **Use maximum TX power for BLE**  
+  Changed BLE TX power to be set to +8 for nRF52840.
+
+- **New boards**  
+  Elecrow ThinkNode M1, M3, M6  
+  LilyGo T-Echo  
+  Minewsemi MX25LE01  
+  Seeed SenseCAP Solar Node P1
+
 ## Changes in OTAFIX 2.1
 
 - **Defaults to OTA DFU mode**  
@@ -22,29 +33,39 @@
 
 - **Unique BLE advertising names per board**  
   In OTA DFU mode, devices advertise using a board-specific name instead of the generic `AdaDFU`:
+  - **Elecrow ThinkNode M1** → `TNM1_DFU`
+  - **Elecrow ThinkNode M3** → `TNM3_DFU`
+  - **Elecrow ThinkNode M6** → `TNM6_DFU`
   - **Heltec T114** → `T114_DFU`
+  - **LILYGO T-Echo** → `LGTE_DFU`
+  - **Minewsemi MX25LE01** → `MX25_DFU`
   - **ProMicro NRF52840** → `PROM_DFU`
-  - **T1000e** → `T1KE_DFU`
-  - **WioTracker L1** → `WTL1_DFU`
   - **RAK 4631** → `4631_DFU`
   - **RAK WisMesh Tag** → `RTAG_DFU`
+  - **Seeed SenseCAP Solar Node P1** → `SCAP_DFU`
+  - **Seeed T1000e** → `T1KE_DFU`
+  - **Seeed WioTracker L1** → `WTL1_DFU`
   - **XIAO NRF52 BLE / SENSE** → `XIAO_DFU`
 
 ---
 
 ## Boards supported
-
+- Elecrow ThinkNode M1
+- Elecrow ThinkNode M3
+- Elecrow ThinkNode M6
 - Heltec Automation Mesh Node T114 / HT-nRF5262
+- LilyGO T-Echo
+- Minewsemi MX25LE01
 - Nologo ProMicro NRF52840 (aka SuperMini NRF52840)
-- Seeed Studio SenseCAP Card Tracker T1000-E
-- Seeed Studio Wio Tracker L1
-- Seeed Studio XIAO nRF52840 BLE (and Seeed SenseCAP Solar Node)
-- Seeed Studio XIAO nRF52840 BLE SENSE
 - RAK 4631 ([See note](#notes-on-RAK4631-bootloader))
-- RAK WisMesh Tag (new 28/11/2025)
+- RAK WisMesh Tag
+- Seeed Studio SenseCAP Card Tracker T1000-E
+- Seeed SenseCAP Solar Node P1
+- Seeed Studio Wio Tracker L1
+- Seeed Studio XIAO nRF52840 BLE ([See note](#notes-on-xiao-nrf52840-ble)
+- Seeed Studio XIAO nRF52840 BLE SENSE
 
-Any board already supported by the Adafruit nRF52 bootloader can be added.  
-If there is another nRF52840-based board you are interested in, please raise an issue.
+If there is another nRF52840-based board you would like to see supported please raise a github issue and we can make it happen.
 
 ---
 
@@ -65,7 +86,7 @@ If you have somehow managed to accidentally flash an incorrect bootloader to you
 
 If the device does not show up on your computer after flashing the bootloader or performing an OTA update, it may be **waiting in OTA DFU mode**.
 
-In **OTAFIX 2.0**, OTA DFU is the default state when no valid application is present.  
+In **OTAFIX 2.0** and above, OTA DFU is the default state when no valid application is present.  
 In this mode:
 - No UF2 drive is exposed
 - No serial port is available
@@ -151,6 +172,18 @@ Although it's not necessary, if you find this useful please consider donating to
 
 ---
 
+## Notes on Xiao NRF52840 BLE
+
+Many of these boards are shipped with the Sense version of the bootloader installed. If your board has the Sense version installed you must use the Sense version when updating via UF2.
+
+You can look at the INFO_UF2.TXT file on the UF2 drive to check what version is currently installed.
+
+To check:
+1. Enter UF2 DFU mode (double-press reset) 
+2. Open the `INFO_UF2.TXT` file on the mounted drive  
+
+If the file shows: "Board-ID: nRF52840-SeeedXiaoSense-v1" then you must install the ***SENSE*** variant if updating via UF2 file.
+
 ## Notes on RAK4631 bootloader
 
 This version of the RAK4631 bootloader is based on a much newer version (0.9.2) of the Adafruit nRF52 bootloader than what RAK Wireless uses on their official bootloader (0.6.2-11).  

lib/sdk11/components/libraries/bootloader_dfu/dfu_transport_ble.c

@@ -864,8 +864,12 @@ static void advertising_start(void)
     advertising_init(&gap_adv.adv_data, adv_flag);
 
     APP_ERROR_CHECK( sd_ble_gap_adv_set_configure(&_adv_handle, &gap_adv, &m_adv_params) );
-    // maximum power for nrf52832, nrf52840 max power is +8
+    // maximum power for nrf52832 is +4, nrf52840 max power is +8
+    #if defined(NRF52840_XXAA)
+    APP_ERROR_CHECK( sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, _adv_handle, 8) );
+    #else
     APP_ERROR_CHECK( sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, _adv_handle, 4) );
+    #endif
     APP_ERROR_CHECK( sd_ble_gap_adv_start(_adv_handle, BLE_CONN_CFG_HIGH_BANDWIDTH) );
 
     m_is_advertising = true;

src/boards/lilygo_techo/board.h

@@ -0,0 +1,63 @@
+/*
+ * The MIT License (MIT)
+ *
+ * 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 _LILYGO_TECHO_H
+#define _LILYGO_TECHO_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+#define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER       1
+#define LED_PRIMARY_PIN   _PINNUM(0, 14) // Blue
+#define LED_STATE_ON      1
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER    2  // hold down user button on boot to enter OTA DFU mode.
+#define BUTTON_1          _PINNUM(1, 10)  // user button
+#define BUTTON_2          _PINNUM(1, 10)
+#define BUTTON_PULL       NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER  "LilyGo"
+#define BLEDIS_MODEL         "T-Echo v1.0"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x0029
+#define USB_DESC_CDC_ONLY_PID  0x0029
+
+#define UF2_PRODUCT_NAME  "LilyGo T-Echo"
+#define UF2_VOLUME_LABEL  "TECHOBOOT"
+#define UF2_BOARD_ID      "nRF52840-TEcho-v1"
+#define UF2_INDEX_URL     "https://lilygo.cc/products/t-echo-lilygo"
+
+#endif // _LILYGO_TECHO_H

src/boards/lilygo_techo/board.mk

@@ -0,0 +1,2 @@
+MCU_SUB_VARIANT = nrf52840
+CFLAGS += -DDEVICE_NAME='"LGTE_DFU"'

src/boards/lilygo_techo/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};

src/boards/minewsemi_mx25le01/board.h

@@ -0,0 +1,65 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Ha Thach 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 _MINEWSEMI_MX25LE01_H
+#define _MINEWSEMI_MX25LE01_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER           2
+#define LED_PRIMARY_PIN       _PINNUM(1, 7)
+#define LED_SECONDARY_PIN     _PINNUM(1, 5)
+#define LED_STATE_ON          1
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER        2
+#define BUTTON_1              _PINNUM(0, 27)
+#define BUTTON_2              _PINNUM(0, 11)
+#define BUTTON_PULL           NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER   "MinewSemi"
+#define BLEDIS_MODEL          "MX25LE01"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x0029
+#define USB_DESC_CDC_ONLY_PID  0x002A
+
+//------------- UF2 -------------//
+#define UF2_PRODUCT_NAME      "MinewSemi MX25LE01"
+#define UF2_VOLUME_LABEL      "MX25LE01"
+#define UF2_BOARD_ID          "MinewSemi-MX25LE01"
+#define UF2_INDEX_URL         "https://www.minewsemi.com"
+
+#endif // _MINEWSEMI_MX25LE01_H

src/boards/minewsemi_mx25le01/board.mk

@@ -0,0 +1,3 @@
+MCU_SUB_VARIANT = nrf52840
+SD_VERSION = 7.3.0
+CFLAGS += -DDEVICE_NAME='"MX25_DFU"'

src/boards/minewsemi_mx25le01/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};

src/boards/sensecap_solar_p1/board.h

@@ -0,0 +1,66 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Ha Thach 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 _SEEED_SOLAR_NODE_P1_H
+#define _SEEED_SOLAR_NODE_P1_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER           1
+#define LED_PRIMARY_PIN       _PINNUM(0, 19)
+#define LED_STATE_ON          1
+
+#define NEOPIXELS_NUMBER      0
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER        2
+#define BUTTON_1              _PINNUM(1, 1) // Hold user button while pressing reset to enter OTA DFU mode
+#define BUTTON_2              _PINNUM(1, 1)
+#define BUTTON_PULL           NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER   "Seeed"
+#define BLEDIS_MODEL          "SenseCAP Solar Node P1"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x2886
+#define USB_DESC_UF2_PID       0x0044
+#define USB_DESC_CDC_ONLY_PID  0x0044
+
+//------------- UF2 -------------//
+#define UF2_PRODUCT_NAME   "Seeed Solar Node P1"
+#define UF2_VOLUME_LABEL   "SENSECAP"
+#define UF2_BOARD_ID       "nRF52840-SeeedSenseCAPSolarP1-v1"
+#define UF2_INDEX_URL      "https://www.seeedstudio.com/"
+
+#endif // _SEEED_SOLAR_NODE_P1_H

src/boards/sensecap_solar_p1/board.mk

@@ -0,0 +1,3 @@
+MCU_SUB_VARIANT = nrf52840
+SD_VERSION = 7.3.0
+CFLAGS += -DDEVICE_NAME='"SCAP_DFU"'

src/boards/sensecap_solar_p1/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};

src/boards/thinknode_m1/board.cmake

@@ -0,0 +1 @@
+set(MCU_VARIANT nrf52840)

src/boards/thinknode_m1/board.h

@@ -0,0 +1,62 @@
+/*
+ * The MIT License (MIT)
+ *
+ * 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 _THINKNODE_M1_H
+#define _THINKNODE_M1_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER       1
+#define LED_PRIMARY_PIN   _PINNUM(0, 14)  // Blue LED
+#define LED_STATE_ON      0
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER    2
+// #define BUTTON_1          _PINNUM(1, 7)   // Function button (TBN)
+#define BUTTON_1          _PINNUM(1, 10)  // Hold page turn to enter OTA DFU mode.
+#define BUTTON_2          _PINNUM(1, 10)  // Page Turn button
+#define BUTTON_PULL       NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER  "ELECROW"
+#define BLEDIS_MODEL         "ThinkNodeM1"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x00DA
+#define USB_DESC_CDC_ONLY_PID  0x00DA
+
+#define UF2_PRODUCT_NAME  "ELECROW ThinkNodeM1"
+#define UF2_VOLUME_LABEL  "ThinkNodeM1"
+#define UF2_BOARD_ID      "nRF52840-ThinkNodeM1-v1"
+#define UF2_INDEX_URL     "https://www.elecrow.com"
+
+#endif // _THINKNODE_M1_H

src/boards/thinknode_m1/board.mk

@@ -0,0 +1,2 @@
+MCU_SUB_VARIANT = nrf52840
+CFLAGS += -DDEVICE_NAME='"TNM1_DFU"'

src/boards/thinknode_m1/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};

src/boards/thinknode_m3/board.h

@@ -0,0 +1,61 @@
+/*
+ * The MIT License (MIT)
+ *
+ * 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 _THINKNODE_M3_H
+#define _THINKNODE_M3_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER       1
+#define LED_PRIMARY_PIN   _PINNUM(1, 5) // Blue
+#define LED_STATE_ON      1
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER    2               // these pins were reversed from the stock bootloader
+#define BUTTON_1          _PINNUM(0, 11)  // probably unconnected?
+#define BUTTON_2          _PINNUM(0, 12)  // user button
+#define BUTTON_PULL       NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER  "ELECROW"
+#define BLEDIS_MODEL         "ThinkNode-M3"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x00DA
+#define USB_DESC_CDC_ONLY_PID  0x00DA
+
+#define UF2_PRODUCT_NAME  "ELECROW ThinkNode-M3"
+#define UF2_VOLUME_LABEL  "ThinkNodeM3"
+#define UF2_BOARD_ID      "nRF52840-ThinkNode-M3-v1"
+#define UF2_INDEX_URL     "https://www.elecrow.com"
+
+#endif // _THINKNODE_M3_H

src/boards/thinknode_m3/board.mk

@@ -0,0 +1,2 @@
+MCU_SUB_VARIANT = nrf52840
+CFLAGS += -DDEVICE_NAME='"TNM3_DFU"'

src/boards/thinknode_m3/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};

src/boards/thinknode_m6/board.h

@@ -0,0 +1,61 @@
+/*
+ * The MIT License (MIT)
+ *
+ * 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 _THINKNODE_M6_H
+#define _THINKNODE_M6_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER       1
+#define LED_PRIMARY_PIN   _PINNUM(0, 7) // Blue
+#define LED_STATE_ON      1
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER    2  // hold down user button on boot to enter OTA DFU mode.
+#define BUTTON_1          _PINNUM(0, 17)  // user button
+#define BUTTON_2          _PINNUM(0, 17)
+#define BUTTON_PULL       NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER  "ELECROW"
+#define BLEDIS_MODEL         "ThinkNodeM6"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x00DA
+#define USB_DESC_CDC_ONLY_PID  0x00DA
+
+#define UF2_PRODUCT_NAME  "ELECROW ThinkNodeM6"
+#define UF2_VOLUME_LABEL  "ThinkNodeM6"
+#define UF2_BOARD_ID      "nRF52840-ThinkNodeM6-v1"
+#define UF2_INDEX_URL     "https://www.elecrow.com"
+
+#endif // _THINKNODE_M6_H

src/boards/thinknode_m6/board.mk

@@ -0,0 +1,2 @@
+MCU_SUB_VARIANT = nrf52840
+CFLAGS += -DDEVICE_NAME='"TNM6_DFU"'

src/boards/thinknode_m6/pinconfig.c

@@ -0,0 +1,19 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};