SWRU311 December 2011 CC2541 Evaluation Module Kit Quick Start Guide Opening the Box and Running the Bluetooth® Low Energy SimpleBLE Demo Application 1. Kit Contents 2. Hardware Requirements 3. Hardware Setup The CC2541EMK is an add-on kit to the CC2540DK. To run the example described in this Quick Start Guide, you would need two SmartRF05 Boards (Rev 1.8.1 or later). These boards are included in the CC2540DK (and not in the CC2541EMK). Connect the antenna to the SMA connector on the CC2541 evaluation module (CC2541EM). Tighten the antenna’s screw firmly on to the SMA connector. If not properly connected, you might see reduced RF performance. 2 x CC2541 Evaluation Modules 2 x Pulse W1010 Antennas Documentation The kit is FCC and IC certified and tested/complies with ETSI/R&TTE over temperature from 0 to +35°C. The antenna, W1010 from Pulse, is a ¼ wave dipole antenna with 2 dBi gain. Caution! The kit contains ESD sensitive components. Handle with care to prevent permanent damage. More information about the SmartRF05EB can be found in www.ti.com/lit/swru210. The CC2541EM boards can also be plugged into a battery board (see www.ti.com/tool/socbb) for standalone operation. Next, mount the CC2541EMs firmly on to connectors P5 and P6 on the SmartRF05EB. Caution! To minimize risk of injury, avoid touching components during operation if symbolized as hot. 4. Power Options There are several ways of applying power to the SmartRF05EB. 2 x 1.5 V AA Alkaline Batteries USB External Power Supply For the batteries and USB, there are voltage regulators on the SmartRF05EB that will set the on-board voltage to 3.3 V. The external power supply should set a voltage that does not exceed 3.3 V. Note that there should only be one active power source at any one time. Warning! To minimize risk of personal injury or property damage, never use rechargeable batteries to power the board. 5. Power the Boards 6. Start-up up Screen Find jumper P11 on the top side of each SmartRF05EB. This jumper is used to set the power source for the board. Set P11 to “1-2” if you are using battery power. Set P11 to “2-3” if you are using USB or an external power supply. Once you have set P11, find switch P8 on the top side of each SmartRF05EB. To power up the boards, flip the switch from the “OFF” position to “ON”. Do not leave unattended. EVM powered when One of the CC2541 CC2541EMs will be pre-loaded with the SimpleBLECentral application, while the other will be p pre-loaded with the SimpleBLEPeripheral application. The LCD screens on the two SmartRF05EBs should display message messages similar to those below: The “0x…” value displayed on each board is the device address. Every CC2541 device has a unique address. 7. Using the Joystick 8. Device Discovery 9. Establish Connection The SimpleBLEPeripheral application runs autonomously and does not require any user interaction. The SimpleBLECentral application, however, requires user interaction by means of joystick U1. Find joystick U1 on the top side of the SmartRF05EB, immediately below the LCD. Before the two devices can connect, the central device must first discover the peripheral device. To perform device discovery, press up on joystick U1 once. The LCD on the central device should display “Discovering…”. To establish a connection with the peripheral, press joystick U1 in towards the board (push it in like it is a button). Once the connection is established, the central device will automatically perform service discovery on the peripheral using the BLE GATT protocol. This should complete within a few seconds. After a few seconds, it should display “Devices Found 1 / <- To Select”. This means that the central device successfully discovered the peripheral. Press left on joystick U1 to view the address of the peripheral device. This address should match the address seen on the peripheral’s LCD. The two LCD screens should appear as in the images below, with the ce central still displaying the peripheral’s address and the peripheral having changed from “Advertising” to “Connected”: The joystick has five different movements: it can be moved up, down, left, right, and it can be pressed in, just like a button. Each movement performs different actions depending on the state of the device. Be careful that you don’t double tap U1 which would terminate the connection immediately, giving Disconnected Reason: 22 22. Web sites: E2E Forum: www.ti.com/lprf www.ti.com/lprf-forum Make sure to subscribe to the Low Low-Power RF Newsletter to receive information about updates to documentation, new product releases releases, and more. Sign up on the TI web pages. 10. Connected Operations 11. Read / Write Data 12. Monitor RSSI Once the connection has been established and service discovery is complete, you can perform the following operations using joystick U1 on the central device: Pressing up on U1 will send a read request to the peripheral device. One byte of data will be read, and the value will be displayed. Pressing up again will send a write request, and one byte of data will be written to the peripheral. The peripheral’s LCD should display the written value each time this is done. Pressing ressing down on U1 will turn on RSSI (received signal strength indication) monitoring. The RSSI will be displayed on the LCD in units of negative dBm. Bluetooth low energy is an ideal technology for transmission of small amounts of data between two devices while consuming very little power, as is demonstrated here. If the boards are moved farther apart from each other, the RSSI will drop (since the value is negative, a higher number means lower RSSI). If they are moved closer together, the RSSI should rise. Read / Write Data – U1 UP RSSI Monitoring – U1 DOWN Connection Parameter Update – U1 RIGHT Terminate Link – U1 IN (towards the board) Continuing to press up on the joystick will alternate between reads and writes, with the value incrementing each time. 13. Connection Parameter Update Pressing right on U1 will send a connection parameter update request to the peripheral to use a longer connection interval. This will result in much longer latency when performing data reads and writes; however the power consumed by both devices is significantly reduced. 14. Terminate Link Pressing U1 in towards the board will terminate the link. The peripheral will return to an advertising state. The central device will display a “Reason” code, which indicates why the disconnection occurred (values are defined in the BLE stack API). In this case, the reason code of 22 indicates that the link termination was initiated by the central device. In the event that the peripheral device goes out of range or has power disconnected from it, you will see a reason code of 8 which indicates that a link timeout has occurred. Pressing down on U1 again will turn off RSSI monitoring. 15. SimpleBLE Demo Source Code The project and source code files for these applications (as well as many others) are included with the Bluetooth low energy (BLE) stack from Texas Instruments, which can be downloaded at www.ti.com/blestack www.ti.com/blestack. The two projects implementing this demo are called alled SimpleBLECentral ((CC2541EM Master configuration) and SimpleBLEPeripheral (CC2541 Slave configuration) configuration). These can be modified as desired, and should provide a good framework for developing your own custom BLE applications. More details on these projects can be found within the BLE Software Developer’s Guide, which is included with the stack stack. You can now perform device discovery and reconnect to the peripheral if desired. Additional Tools and Links BLE Packet Sniffer SmartRF™ Studio SmartRF RF Flash Programmer A CC2540 USB Dongle (not included) can be used as a BLE sniffer and monitor packets while the SimpleBLE Demo is running. SmartRF Studio allows you to configure the radio, run RF performance tests, and run link tests between the two SmartRF05EBs. Texas Instruments has a simple tool which can be used to program and flash the CC2541 SmartRF Studio can be www.ti.com/smartrfstudio SmartRF Flash Programmer can be downloaded from www.ti.com/tool/flashprogrammer The SmartRF Protocol Packet Sniffer software can be downloaded from www.ti.com/packetsniffer downloaded from BTool IAR Embedded Workbench Useful Links BTool is a Windows application that allows you to control a central device using the serial interface and perform various BLE functions while connected to a peripheral device. To develop software, program, and debug the CC2541, you should use IAR Embedded Workbench for 8051. 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