Creating a ZigBee Smart Energy Device with the MSP430F54xx and the CC2530-ZNP

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This paper describes how to create a ZigBee
Smart Energy Device using the MSP430F54xx
as the host application processor to the
CC2530-ZNP (ZigBee Pro Network Processor).

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Creating a ZigBee Smart Energy Device with the MSP430F54xx and the CC2530-ZNP

  1. 1. W H I T E PA P E R Zin Kyaw, Systems Application Engineer Texas Instruments Creating a ZigBee® Smart Energy Device with the MSP430F54xx andIntroductionThis paper describes how to create a ZigBee the CC2530-ZNPSmart Energy Device using the MSP430F54xx (ZigBee Pro Network Processor)as the host application processor to theCC2530-ZNP (ZigBee Pro Network Proces-sor). The physical interface between theMSP430 and the CC2530-ZNP is discussed, Physical interface and development platformas well as the software application frame- Although the CC2530-ZNP supports UART, USB, and SPI interfaces, we’ll be discussingwork used to drive the CC2530-ZNP. This use of the SPI interface. Table 1 shows the recommended pin connection between the hostpaper assumes that the reader is familiar processor and the CC2530-ZNP, which matches the interconnect used by the EXP430F5438with basic ZigBee concepts and terminology. Experimenter Board where the MSP430F5438 USCI B0 is used in 3-wire SPI mode. The CC2530-ZNP contains the coreZigBee Pro stack and exposes API interfac- MSP430F5438 Direction CC2530-ZNP Direction P3.0 Out P1.4 (SS) Ines to the host processor for configuration of P3.1 (UCB0SIMO) Out P1.6 (MOSI) Inthe stack and data transfer. In the sample P3.2 (UCB0SOMI) In P1.7 (MISO) Outapplication installer that is provided by TI, P3.3 (UCB0CLK) Out P1.5 (SCLK) Inthese APIs are abstracted by an application P1.2 Out RESET_N Inframework called the ZAP (ZigBee Applica- P1.4 In P0.4 (SRDY) Outtion Processor) framework, which makes it P1.6 Out P0.3 (MRDY) In P2.0 (CFG1, driven HIGHeasy for an application developer to write P8.2 Out for SPI transport) Insophisticated ZigBee Smart Energy applica- N/C Configured as input with P1.2 (CFG0) In pull-uptions, among others (e.g., Home Automa- Table 1. MSP430F5438 to CC2530-ZNP interconnect.tion and manufacturer-specific profiles).TI has provided an extensive framework tomake application development easy and To test this connection, one can obtain a CC2530EMK [which contains 2× CC2530 evalu-thus re-use of this application framework ation modules (EMs)] and 2× EXP430F5438 Experimenter Boards separately. This setup isis highly encouraged. However, for appli- shown in Figure 1 on the following page. One will also need the SmartRF05EB board whichcation developers that choose to use the is used to program the CC2530EM modules. The SmartRF05EB board comes included withCC2530-ZNP but still want to build their either the CC2530DK, CC2530ZDK, or CC2520DK.application framework from the ground up,the ZigBee Smart Energy sample applica-tion suite serves as great reference codeof how to interface with the CC2530-ZNP.
  2. 2. 2 Texas Instruments Figure 1. Development platform for MSP430F54xx/CC2530-ZNP Software application The software application framework is built upon the OSAL (Operating System Abstraction Layer) operat- framework ing system (see reference [2] for more information) from TI. OSAL provides services for task management, power management, non-volatile memory, dynamic memory management, software timers, event generation, inter- and intra-task messaging (or message queues), and a seamless interface to the layer that abstracts the board support package (BSP) called the Hardware Abstraction Layer (HAL). The ZAP framework re-uses the architecture of the ZigBee® application framework on TI’s ZigBee stack (Z-Stack™). Each layer of the application framework is organized as a task within OSAL, and the HAL task is always given top priority, as shown in the system diagram of OSAL ZAP services in Figure 2. The HAL task is the first task that runs and HAL main Tasks serviced in this order ZAP ZCL osal_init_system Application osal_start_system Figure 2. System diagram of OSAL ZAP services Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010 (ZigBee Pro Network Processor)
  3. 3. Texas Instruments 3 Application OSAL ZigBee Cluster Library (ZCL) Task management Smart Energy Dynamic General memory management Foundation ZAP Timers and events App Phy ZNP Sys Non-volatile memory AF Util ZDO CBKE INTER-PAN ZMAC Power management HAL Task SPI LED LCD Flash messaging Timers ADC Keys DCO Figure 3. Layers of the ZAP framework after each subsequent task runs to completion, a branch is always taken back to the HAL task to see if it needs to be serviced. The tasks in the diagram shown are typical of a ZAP implementation. The ZAP layer shown in Figure 3 acts as a translation layer between Z-Stack™ APIs and ZNP APIs. There- fore, a customer application written for the full ZigBee® stack will work as is when used on a ZAP platform that TI supports. This saves the customer from having to learn a different application development philosophy when using the CC2530-ZNP. In the sections ahead, we’ll examine how the ZAP layer takes care of translat- ing application API calls to ZNP API calls for configuration and data exchanges. For this purpose we use the Smart Energy Sample Application Project which can be found in C:Texas InstrumentsZAP-MSP430-1.0.0 ProjectszstackZAPSE-SampleAppEXP5438 after installing the ZAP installer package. ZNP startup The macro HAL_SPI_INIT() takes care of initializing the SPI interface of the MSP430™. The function zapPhyInit() is used to initialize the ZNP hardware control signals and allow the CC2530-ZNP to run by de- asserting the RESET_N pin. Once the ZNP has finished its internal initialization sequence, it signals comple- tion to the host processor by asserting the SRDY signal. The zapPhySpiPoll() process will then retrieve the SYS_RESET_IND command. Subsequently, the zapSysResetInd() function is called to alert the ZAP layer that it has received the reset indication and that it can now go ahead and configure the ZNP. From now on, we’ll call this the “ZNP sync event”.Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010(ZigBee Pro Network Processor)
  4. 4. 4 Texas Instruments ZNP configuration The first thing the user has to do is decide whether to restore the network state of the ZNP device every time a ZNP sync event occurs. This is selectable by the compile option ZAP_NV_RESTORE. If ZAP_NV_RESTORE is set to FALSE, the network state of the ZNP will be cleared, and default configuration used. zapAfSync() and zapZdoSync() are used to register application endpoints and ZDO callbacks, respectively. The host application must do this upon every ZNP sync event since application endpoint and callback information are not saved in ZNP non-volatile memory. The application then makes a series of calls using znp_nv_write for the items ZCD_NV_LOGICAL_TYPE, ZDAPP_CONFIG_PAN_ID, DEFAULT_CHANLIST to configure the logical device type (coordinator, router, or end device), PAN ID, and scan channel mask, respectively. The default values from the zap.cfg configura- tion file are taken as values. When the compile option TC_LINKKEY_JOIN is defined, zapCertSync() is called to configure test certificate data for ZigBee® CBKE (Certificate Based Key Establishment) security. Note that since these configuration items are declared as global variables within the ZNP, a reset of the ZNP is not required to change these items at runtime. Note that this configuration of ZNP has been automated if the ZAP_AUTO_CFG compile option is set to TRUE in zap.cfg. Once all the configuration changes are made, the host processor can then start the device by calling ZDOInitDevice which in turn calls the ZDO_STARTUP_FROM_APP ZNP API function. The compile option ZAP_ZDO_STARTUP_AREQ is used to allow the ZDO_STARTUP_FROM_APP command to be sent as an asynchronous request (AREQ) because the device startup process (which includes scanning for networks) could take > 400 msec. Therefore, this allows the application to service other tasks instead of having to wait for the synchronous response (SRSP). The status of this request will be queued for the host processor as a ZDO_STATE_CHANGE_IND command. This indication is then passed up to the application task to notify it that the device has a valid ZigBee network address. The application then processes this event as: case ZDO_STATE_CHANGE: if ((DEV_END_DEVICE == (devStates_t)(MSGpkt->hdr.status)) || (DEV_ROUTER == (devStates_t)(MSGpkt->hdr.status))) { // device is on the ZigBee network Note that this network startup of ZNP has been automated if the ZAP_AUTO_START compile option is set to TRUE in zap.cfg. Registering application Part of the application’s initialization function is to register for the SE endpoint and desired ZDO callbacks. For endpoints and ZDO example, the function zclSE_Init registers the SE endpoint description with the ZNP. callbacks Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010 (ZigBee Pro Network Processor)
  5. 5. Texas Instruments 5 // register for SE endpoint zclSE_Init( &simpleMeterSimpleDesc ); This translates into a ZAP proxy function called znp_afRegisterExtended() which uses the AF_REGISTER ZNP API to register this endpoint with the ZNP. The application can also register for certain ZDO callback notifications. The Energy Service Portal (ESP) example registers for the following ZDO callbacks: // register for end device annce and simple descriptor responses ZDO_RegisterForZDOMsg( espTaskID, Device_annce ); ZDO_RegisterForZDOMsg( espTaskID, Simple_Desc_rsp ); The ZDO_RegisterForZDOMsg() function then calls the ZAP proxy function znp_ZDO_RegisterForZDOMsg(), which sends the ZDO_MSG_CB_REGISTER command to the ZNP. When the ZAP layer receives an incoming ZDO command, the function zapZdoProcessIncoming is called. The command is then processed in the case handler for MT_ZDO_MSG_CB_INCOMING. This command handler then calls ZDO_SendMsgCBs in order to parse and determine which application task should receive the callback. The ESP application uses the end device announce to detect when other devices join the SE network. The ESP then uses the ZDO simple descriptor request to query the device for what type of device it is. Both callbacks are processed as follows: static void esp_ProcessZDOMsg( zdoIncomingMsg_t *inMsg ) { ZDO_DeviceAnnce_t devAnnce; switch ( inMsg->clusterID ) { case Device_annce: { ZDO_ParseDeviceAnnce( inMsg, &devAnnce ); simpleDescReqAddr.addrMode = (afAddrMode_t)Addr16Bit; simpleDescReqAddr.addr.shortAddr = devAnnce.nwkAddr; // set simple descriptor query event osal_set_event( espTaskID, SIMPLE_DESC_QUERY_EVT );Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010(ZigBee Pro Network Processor)
  6. 6. 6 Texas Instruments } break; case Simple_Desc_rsp: { ZDO_SimpleDescRsp_t *pSimpleDescRsp; // pointer to received simple desc response pSimpleDescRsp = (ZDO_SimpleDescRsp_t *)osal_mem_alloc( sizeof( ZDO_ SimpleDescRsp_t ) ); ……… Initiating key When full ZigBee® CBKE security is used with the Certicom Elliptic Curve Cryptography (ECC) library, in order establishment to establish an application link key with the ESP, the function zclGeneral_KeyEstablish_InitiateKeyEstablishment is called. This in turn sends the UTIL_ZCL_KEY_EST_INIT_EST command to the ZNP. As the entire ECC pro- cess could take up to 20 seconds, zapPhyWait(zapAppPort, ZCL_KEY_EST_INIT_EST_WAIT) is called to tell the low-level SPI driver to wait at least 30 seconds before timing out on the SRSP. When the key establish- ment process completes, the zapUtilProcessIncoming function will notify the application via the MT_UTIL_ ZCL_KEY_ESTABLISH_IND handler. The application can then decide to use this indication to determine that it can start to communicate with the ESP. For example, in the simple meter example we have: case ZCL_KEY_ESTABLISH_IND: if ((MSGpkt->hdr.status) == TermKeyStatus_Success) { osal_start_timerEx( simpleMeterTaskID, SIMPLEMETER_REPORT_ATTRIBUTE_EVT, SIMPLEMETER_REPORT_PERIOD ); } Sending Smart Once the key establishment procedure is complete, sending application commands is straightforward. The Energy profile ZCL layer provides API functions to send correctly formatted SE commands, such as the following, which is commands used in the simple meter example to send a report attribute command to the ESP: zcl_SendReportCmd( SIMPLEMETER_ENDPOINT, &ESPAddr, ZCL_CLUSTER_ID_SE_SIMPLE_METERING, pReportCmd, ZCL_FRAME_SERVER_CLIENT_DIR, 1, 0 ); Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010 (ZigBee Pro Network Processor)
  7. 7. Texas Instruments 7 These commands are translated into AF_DATA_REQUEST commands that are sent to the ZNP. In the Smart Energy Sample Application Project, there are also other device configurations such as the In-Premise Display and Load Control Device that show examples of how to use commands related to Pricing and Demand Response and Load Control, respectively. Receiving Smart Any incoming over-the-air message is extracted by the host processor (as an AF_INCOMING_CMD) and then Energy profile passed up to the ZCL layer. The application registers callbacks for each command that it wishes to process commands on the receive side. As the ESP has to support all SE commands, all SE callbacks are registered by the ESP application: static zclSE_AppCallbacks_t esp_SECmdCallbacks = { esp_GetProfileCmdCB, // Get Profile Command esp_GetProfileRspCB, // Get Profile Response esp_ReqMirrorCmdCB, // Request Mirror Command esp_ReqMirrorRspCB, // Request Mirror Response esp_MirrorRemCmdCB, // Mirror Remove Command esp_MirrorRemRspCB, // Mirror Remove Response esp_GetCurrentPriceCB, // Get Current Price esp_GetScheduledPriceCB, // Get Scheduled Price esp_PublishPriceCB, // Publish Price esp_DisplayMessageCB, // Display Message Command esp_CancelMessageCB, // Cancel Message Command esp_GetLastMessageCB, // Get Last Message Command esp_MessageConfirmationCB, // Message Confirmation esp_LoadControlEventCB, // Load Control Event esp_CancelLoadControlEventCB, // Cancel Load Control Event esp_CancelAllLoadControlEventsCB, // Cancel All Load Control Events esp_ReportEventStatusCB, // Report Event Status esp_GetScheduledEventCB, // Get Scheduled Event }; For example when the ESP receives a Get Current Price command from an In-Premise Display, the esp_GetCurrentPriceCB callback function is called and the Publish Price command is sent back:Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010(ZigBee Pro Network Processor)
  8. 8. 8 Texas Instruments static void esp_GetCurrentPriceCB( zclCCGetCurrentPrice_t *pCmd, afAddrType_t *srcAddr, uint8 seqNum ) { #if defined ( ZCL_PRICING ) // On receipt of Get Current Price command, the device shall send a // Publish Price command with the information for the current time. zclCCPublishPrice_t cmd; osal_memset( &cmd, 0, sizeof( zclCCPublishPrice_t ) ); cmd.providerId = 0xbabeface; cmd.priceTier = 0xfe; // copy source address of display device that requested current pricing info so // that esp can send messages to it using destination address of IPDAddr osal_memcpy( &ipdAddr, srcAddr, sizeof ( afAddrType_t ) ); zclSE_Pricing_Send_PublishPrice( ESP_ENDPOINT, srcAddr, &cmd, false, seqNum ); #endif // ZCL_PRICING } Conclusion This paper has described how to create a ZigBee® Smart Energy device using the MSP430F54xx as the host application processor to the CC2530-ZNP (ZigBee Pro Network Processor). A typical smart meter application that would benefit most from this type of architecture would be a gas or water meter since extended battery life of 10 years or greater is a key requirement for these devices. The MSP430F54xx and CC2530-ZNP combination provides a low-power and low-cost solution that meets this requirement. The ZAP software ap- plication framework provides an easy-to-use development environment that accelerates ZigBee development for smart meter applications. Creating a ZigBee® Smart Energy Device with the MSP430F54xx and the CC2530-ZNP January 2010 (ZigBee Pro Network Processor)
  9. 9. Texas Instruments 9 References [1] CC2530-ZNP Interface Specification, SWRA312 [2] OSAL API document, SWRA194 [3] Z-Stack™ API document, SWRA195 [4] ZCL API document, SWRA197 [5] Z-Stack Smart Energy Developer’s Guide, SWRA216 For more information on Smart Metering devices from TI, visit www.ti.com/metering, or e-mail: metering@ti.com Important Notice: The products and services of Texas Instruments Incorporated and its subsidiaries described herein are sold subject to TI’s standard terms and conditions of sale. Customers are advised to obtain the most current and complete information about TI products and services before placing orders. TI assumes no lia- bility for applications assistance, customer’s applications or product designs, software performance, or infringement of patents. The publication of information regard- ing any other company’s products or services does not constitute TI’s approval, warranty or endorsement thereof.MSP430 and Z-Stack are trademarks of Texas Instruments Incorporated. All other trademarks are the property of their respective owners.© 2010 Texas Instruments Incorporated SLYY022
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