1. nRF52840 Feature list
1.1 Features
- Bluetooth® 5, IEEE 802.15.4-2006, 2.4 GHz transceiver
- -95 dBm sensitivity in 1 Mbps Bluetooth® low energy mode
- -103 dBm sensitivity in 125 kbps Bluetooth® low energy mode (long range)
- -20 to +8 dBm TX power, configurable in 4 dB steps
- On-air compatible with nRF52, nRF51, nRF24L, and nRF24AP Series
- Supported data rates:
- Bluetooth® 5: 2 Mbps, 1 Mbps, 500 kbps, and 125 kbps
- IEEE 802.15.4-2006: 250 kbps
- Proprietary 2.4 GHz: 2 Mbps, 1 Mbps
- Single-ended antenna output (on-chip balun)
- 128-bit AES/ECB/CCM/AAR co-processor (on-the-fly packet encryption)
- 4.8 mA peak current in TX (0 dBm)
- 4.6 mA peak current in RX
- RSSI (1 dB resolution)
- ARM® Cortex® -M4 32-bit processor with FPU, 64 MHz
- 212 EEMBC CoreMark score running from flash memory
- 52 µA/MHz running CoreMark from flash memory
- Watchpoint and trace debug modules (DWT, ETM, and ITM)
- Serial wire debug (SWD)
- Rich set of security features
- ARM® TrustZone® Cryptocell 310 security subsystem
- NIST SP800-90A and SP800-90B compliant random number generator
- AES-128: ECB, CBC, CMAC/CBC-MAC, CTR, CCM/CCM*
- Chacha20/Poly1305 AEAD supporting 128- and 256-bit key size
- SHA-1, SHA-2 up to 256 bits
- Keyed-hash message authentication code (HMAC)
- RSA up to 2048-bit key size
- SRP up to 3072-bit key size
- ECC support for most used curves, among others P-256 (secp256r1) and Ed25519/Curve25519
- Application key management using derived key model
- Secure boot ready
- Flash access control list (ACL)
- Root-of-trust (RoT)
- Debug control and configuration
- Access port protection (CTRL-AP)
- Secure erase
- ARM® TrustZone® Cryptocell 310 security subsystem
- Flexible power management
- 1.7 V to 5.5 V supply voltage range
- On-chip DC/DC and LDO regulators with automated low current modes
- 1.8 V to 3.3 V regulated supply for external components
- Automated peripheral power management
- Fast wake-up using 64 MHz internal oscillator
- 0.4 µA at 3 V in System OFF mode, no RAM retention
- 1.5 µA at 3 V in System ON mode, no RAM retention, wake on RTC
- 1 MB flash and 256 kB RAM
- Advanced on-chip interfaces
- USB 2.0 full speed (12 Mbps) controller
- QSPI 32 MHz interface
- High-speed 32 MHz SPI
- Type 2 near field communication (NFC-A) tag with wake-on field
- Touch-to-pair support
- Programmable peripheral interconnect (PPI)
- 48 general purpose I/O pins
- EasyDMA automated data transfer between memory and peripherals
- Nordic SoftDevice ready with support for concurrent multiprotocol
- 12-bit, 200 ksps ADC - 8 configurable channels with programmable gain
- 64 level comparator
- 15 level low-power comparator with wake-up from System OFF mode
- Temperature sensor
- 4x 4-channel pulse width modulator (PWM) unit with EasyDMA
- Audio peripherals: I2S, digital microphone interface (PDM)
- 5x 32-bit timer with counter mode
- Up to 4x SPI master/3x SPI slave with EasyDMA
- Up to 2x I2C compatible 2-wire master/slave
- 2x UART (CTS/RTS) with EasyDMA
- Quadrature decoder (QDEC)
- 3x real-time counter (RTC)
- Single crystal operation
- Package variants
- aQFN™ 73 package, 7 x 7 mm
- WLCSP93 package, 3.544 x 3.607 mm
1.2 Applications
- Advanced computer peripherals and I/O devices
- Mouse
- Keyboard
- Multi-touch trackpad
- Advanced wearables
- Health/fitness sensor and monitor devices
- Wireless payment enabled devices
- Internet of things (IoT)
- Smart home sensors and controllers
- Industrial IoT sensors and controllers
- Industrial IoT sensors and controllers
- Remote controls
- Gaming controllers
2. Memory layout
nRF52840
| 用途 | 地址範圍 | 大小 (KB) |
|---|---|---|
| Bootloader settings | 0x000F_F000 - 0x0010_0000 | 4 |
| MBR parameter storage | 0x000F_E000 - 0x000F_F000 | 4 |
| Bootloader | 0x000F_8000 - 0x000F_E000 | 24 |
| Zigbee settings | 0x000E_C000 - 0x000F_8000 | 48 |
| Application area (incl. free space) | 0x0000_1000 - 0x000E_C000 | 940 |
| Master Boot Record (MBR) | 0x0000_0000 - 0x0000_1000 | 4 |
3. 工具安裝
4. Prepare Firmware
4.1 MBR setup
-
打開命令窗口
win + rcmd -
導航到
mbr.hex文件目錄- 默認位置：
$(nRF5_SDK_for_Thread_and_Zigbee_v3.2.0_9fade31)\components\softdevice\mbr\nrf52840\hex\mbr_nrf52_2.4.1_mbr.hex
- 默認位置：
-
下載
mbr.hexnrfjprog -f nrf52 -r --program mbr_nrf52_2.4.1_mbr.hex --chiperase
4.2 Bootloader setup
-
編譯 bootloader 工程
-
工程默認位置:
$(nRF5_SDK_for_Thread_and_Zigbee_v3.2.0_9fade31)\examples\zigbee\ota\bootloader -
下載
bootloader.hex(該文件位於工程目錄下的_build目錄下)nrfjprog -f nrf52 -r --program nrf52840_xxaa_mbr.hex
-
4.3 OTA Upgrade Client setup
- 編譯 app 工程
- 工程默認位置:
$(nRF5_SDK_for_Thread_and_Zigbee_v3.2.0_9fade31)\examples\zigbee\ota\client - 生成的文件
nrf52840_xxaa.hex位於工程目錄下的_build目錄下
5. Firmware packaging
5.1 Make Firmware
-
產生公私鑰対，並將生成的公鑰添加到工程中的
dfu_public_key.c文件中，替換掉之前的公鑰。nrfutil keys generate priv.pemnrfutil keys display --key pk --format code priv.pem --out_file dfu_public_key.c
-
編譯 bootloader (詳見 Chapter 4.2)
-
編譯 app (詳見 Chapter 4.3) Note: 此時工程中的公鑰已替換爲第一步生成的公鑰
-
產生
bootloader配置文件nrfutil settings generate --family NRF52840 --application nrf52840_xxaa.hex --application-version 0x01010101 --bootloader-version 1 --bl-settings-version 2 --app-boot-validation VALIDATE_ECDSA_P256_SHA256 --key-file priv.pem settings.hex
-
合併 app 和 bootloader 配置文件
mergehex -m nrf52840_xxaa.hex settings.hex -o dfu_client.hex
5.2 Flash Firmware
-
通過 USB 連接 nRF52840 到電腦。
-
擦除全部 Flash
nrfjprog -f nrf52 --eraseall -
依次下載 MBR，Bootloader 和 merge 之後的 app 固件。(參見 Chapter 4)
nrfjprog -f nrf52 -r --program mbr_nrf52_2.4.1_mbr.hex --chiperasenrfjprog -f nrf52 -r --program nrf52840_xxaa_mbr.hexnrfjprog -f nrf52 -r --program dfu_client.hex --sectorerase
5.3 Packaging New Firmware
nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application-version 0x01020101 --application nrf52840_xxaa_new.hex --key-file priv.pem --app-boot-validation VALIDATE_ECDSA_P256_SHA256 app_dfu_package.zip --zigbee True --zigbee-manufacturer-id 123 --zigbee-image-type 321 --zigbee-comment good_image --zigbee-ota-hw-version 52 --zigbee-ota-fw-version 0x01020101
6. Processing Batch
6.1 Generate Key Pair
// 1. generate_key_pair.bat
cd %~dp0
:: 1. generate sm2 key-pair
nrfutil keys generate ./key/priv.pem
:: 2. generate pub_key code
nrfutil keys display --key pk --format code ./key/priv.pem --out_file ./key/dfu_public_key.c
echo finish !
pause
6.2 Signature Firmware
// 2. signature_firmware.bat
cd %~dp0
set firmware_version=0x00000001
set /p firmware_version=input packaging firmware version (default: 0x00000001):
echo %firmware_version%
:: 1. generate bootloader setting file:settings.hex
nrfutil settings generate --family NRF52840 --application ./firmware/nrf52840_xxaa.hex --application-version %firmware_version% --bootloader-version 1 --bl-settings-version 2 --app-boot-validation VALIDATE_ECDSA_P256_SHA256 --key-file ./key/priv.pem ./gen/settings.hex
:: 2. merge app and bootloader
mergehex -m ./firmware/nrf52840_xxaa.hex ./gen/settings.hex -o ./gen/dfu_client.hex
:: 3. program flash
:: 3.1 erase all flash
nrfjprog -f nrf52 --eraseall
:: 3.2 flash mbr
nrfjprog -f nrf52 -r --program ./firmware/mbr_nrf52_2.4.1_mbr.hex --chiperase
:: 3.3 flash bootloader
nrfjprog -f nrf52 -r --program ./firmware/nrf52840_xxaa_mbr.hex
:: 3.4 flash app
nrfjprog -f nrf52 -r --program ./gen/dfu_client.hex --sectorerase
echo finish !
pause
6.3 Pack OTA
// 3. pack_ota.bat
cd %~dp0
set firmware_version=0x00000002
set manufacturer_id=0x007B
set image_type=0x0141
set /p firmware_version=input ota firmware version (default: 0x00000002):
set /p manufacturer_id=input ota manufacturer id (default: 0x007B):
set /p image_type=input ota image type (default: 0x0141):
echo "firmware_version: %firmware_version%"
echo "manufacturer_id: %manufacturer_id%"
echo "image_type: %image_type%"
nrfutil pkg generate --hw-version 52 --sd-req 0x00 --application-version %firmware_version% --application ./firmware/nrf52840_xxaa_new.hex --key-file ./key/priv.pem --app-boot-validation VALIDATE_ECDSA_P256_SHA256 app_dfu_package.zip --zigbee True --zigbee-manufacturer-id %manufacturer_id% --zigbee-image-type %image_type% --zigbee-comment good_image --zigbee-ota-hw-version 52 --zigbee-ota-fw-version %firmware_version%
echo finish !
pause