Introduction

nRF5 SDK v9.0.0
nRF51 SDK v9.0.0

The nRF51 SDK documentation includes descriptions and other reference material to help you understand the various components of the SDK. Examples are provided for development purposes only and should always be tested with your design.

Note: The nRF51 SDK is in maintenance mode . For more information, see the nRF Connect SDK and nRF5 SDK statement . For new projects, we recommend the nRF Connect SDK .

See Getting Started for instructions on how to run the provided examples.

This version of the SDK supports the following SoftDevices:

SDK Release Notes: 

nRF51 SDK v9.0.0
----------------
Release Date: Week 28
  
Highlights:
    - Support for S210 SoftDevice v5.0.0
    - Support for S310 SoftDevice v3.0.0
    - Documentation moved to Infocenter
    - DFU Signing using Elliptic Curve Cryptography added as experimental
        - Available in the zip file only
    - Running Speed and Cadence relay example showing concurrent 
      central/peripheral functionality of S130
  
The following toolchains/devices have been used for testing and verification:
    - ARM: MDK-ARM version 5.14.0.0
    - GCC: GCC ARM Embedded 4.9 2015q1
    - IAR: IAR Workbench 7.20
    - Windows XP SP3 32-bit
    - Windows 7 SP1 64-bit
    - Windows 8.1
  
Supported SoftDevices:
    - S110 v8.0.0
    - S120 v2.1.0
    - S130 v1.0.0
    - S210 v5.0.0
    - S310 v3.0.0
  
Supported boards:
    - PCA10028
    - PCA10031
  
    For other devices and boards, see the SDK documentation, section 
    "Using the SDK with other boards".
  
Changes:
    
    - Flash access module has been refactored (pstorage).

    ANT:
        - Both the S310 and the S210 SoftDevices now support an extended 
          number of ANT channels (16).
 
 
        Libraries:
            - Heart Rate Monitor Profile
            - ANT stack configuration
            - ANT channel configuration
            - ANT channel state indicator
            - ANT pulse simulator
         
        Examples:
            - The ANT HRM examples have been refactored.
            - The Bicycle Power examples (ant_bicycle_pwr) support S310.
  
    ANT + BLE (S310):
        The following examples were added:
        - Bluetooth LE and ANT combined heart rate example (ble_ant_app_hrm).
        - Experimental ANT Shared Channels (experimental_ant_shared_channel_master_to_master, 
          experimental_ant_shared_channel_slave).
 
    BLE:
     - Advertising module has a new mode: Low Duty Cycle Directed Advertising.
     - Running Speed and Cadence Client added as experimental.
     - Bluetooth Developer Studio template added as experimental.
     - Heart Rate Sensor example (ble_app_hrs) supports S310.
     - Running Speed and Cadence example (ble_app_rscs) supports S310.
     - Combined Peripheral and Central example added as experimental.
     - DFU Signing using Elliptic Curve Cryptography added as experimental
       (using the same elliptic curve and hashing algorithm as Bluetooth 
       Low Energy 4.2 Secure Connections).
 
Fixed issues:
     - Pstorage now supports updates of bond split across two pages.
     - Advertising module can be set to infinite time-out.
     - Corrected clock source in BLE multiactivity beacon example.
     - Serialization HCI transport layer: Receiving packet-buffer is not 
       freed while sending ACK or NACK.
  
Known issues:
    - Device Manager is not supported in multi-role S130 operation.
        - Device Manager works in peripheral or central only operation on 
          S130. This must be decided at compile time.
    - The DFU over BLE example has been tested to work with a minimum 
      connection interval of 11.25 ms. The application cannot handle 
      connection intervals lower than 11.25 ms and may undergo a system 
      reset in the middle of a firmware update.
         Workaround: If you face unexpected disconnects during the firmware 
         update process, consider increasing the connection interval used
         by the master.
    - App_pwm occasionally gives inverted signal.
    - The old manual procedure for testing buttonless DFU, as specified in
      the documentation, can lead to the DFU process hanging or returning 
      an error when used with Master Control Panel 3.8 and newer.

Please send us your feedback about the documentation! For technical questions, visit the Nordic Developer Zone .