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AT86RF231zigbee的使用一

電路如圖所示：

其中控制芯片使用SAM3S4B,通過SPI格式（單一的SAM3S4B為主端，AT86RE231為從端）與AT86RF231進(jìn)行通訊，AT86RF231是一款工業(yè)級(jí)，低電壓供電，超低功耗，方便操作，遵循IEEE802.15.4-2006 硬件標(biāo)準(zhǔn)。AT86RF231將控制信號(hào)轉(zhuǎn)換為zigbee模式的差分對(duì)信號(hào)，通過2.45Ghz的諧波濾波器2450FB15L0001濾波后接入天線與其余zigbee端點(diǎn)進(jìn)行通訊，2450FB15L0001主要是對(duì)接受到得zigbee信號(hào)進(jìn)行濾波。

Zigbee框架下編譯程序，需要進(jìn)行些簡單的設(shè)置，

因?yàn)樘幣czigbee協(xié)議�？蚣苤校�部分源碼被atmel，封裝起來，在man函數(shù)中，SYS_sysinit();系統(tǒng)初始化給出.h文件，而沒有具體的C代碼。這意味ZIGBEE的具體結(jié)構(gòu)核心部分不是開源的。實(shí)際中SYS_sysinit()在libBc_All_At91sam3s4c_Rf231_Iar.a中，該文件被封裝起來。

其中，對(duì)bitcloud編譯生成的是libHAL_Sam3sEkRf2xx_At91sam3s4c_64Mhz_Iar.a。 這里面即便被封住，我們可以進(jìn)入bitcloud源碼內(nèi)，解讀代碼，如WTD操作，HAL_InstallInterruptVector（），TimeTick_Configure（）還是可以進(jìn)行代碼解讀的。那對(duì)zigbee格式下的函數(shù)應(yīng)該怎樣跟蹤解析代碼：例如pio.h中，PIO_Configure（）；無法看到C代碼的實(shí)現(xiàn)過程。可以鼠標(biāo)右擊pio.h文件（見下圖1），open containing folder，打開文件夾，找到include中的pio.h文件，可以推測(cè)出點(diǎn)C文件如果有，應(yīng)該存在于source中。進(jìn)行代碼解讀。

圖1

在下面歷程中，給出協(xié)調(diào)器和節(jié)點(diǎn)的實(shí)現(xiàn)。

協(xié)調(diào)器部分程序：

int main(void)
        {
                //初始化，相關(guān)系統(tǒng)配置
                SYS_SysInit();
                ..
                ..
                for(;;)
                {
                        //數(shù)據(jù)處理
                        ..
                        ..
                        SYS_RunTask();
                }
        }

SYS_SysInit();函數(shù)是系統(tǒng)的函數(shù)，用來初始化系統(tǒng)的硬件;

SYS_RunTask();是調(diào)用zigbee的入口函數(shù)，會(huì)調(diào)用BitCloud協(xié)議棧中的用戶應(yīng)用程序，即APL_TaskHandler()；

voidAPL_TaskHandler(void)
        {
                switch (appState)
                {
                        case APP_INITIAL_STATE:
                        initHardware();
                        initNetwork();
                        break;
                        case APP_JOINING_STATE:
                        startNetwork();
                        break;
                        case APP_JOINED_STATE:
                        break;
                        default:
                        break;
                }
        }

APL_TaskHandler();這個(gè)函數(shù)類似個(gè)有限狀態(tài)機(jī)，是zigbee所處狀態(tài)的處理，程序在初始化時(shí)static AppState_tappState = APP_INITIAL_STATE;

如果沒有添加入網(wǎng)絡(luò)，或者從網(wǎng)絡(luò)中斷掉，在主程序每次循環(huán)的時(shí)候，會(huì)添加入網(wǎng)絡(luò)，如果是已將處于zigbee網(wǎng)絡(luò)中，則處于APP_JOINED_STATE狀態(tài)，直接退出APL_TaskHandler()函數(shù)。

我們可以看下具體狀態(tài)下的子函數(shù)；

硬件初始化只是配置個(gè)LED，當(dāng)zigbee網(wǎng)絡(luò)正常工作時(shí)，led1常亮狀態(tài)，否認(rèn)閃亮。

static void initHardware(void)
        {
                LED_Configure(APP_LED_0);
                LED_Configure(APP_LED_1);
        }

而對(duì)協(xié)調(diào)器的配置是zigbee配置的關(guān)鍵部分，下面一段代碼將本身配置為協(xié)調(diào)器，并在網(wǎng)絡(luò)中定義兩個(gè)節(jié)點(diǎn)。

static void initNetwork(void)
        {
                DeviceType_tdeviceType = DEVICE_TYPE_COORDINATOR; //配置成協(xié)調(diào)器
                CS_WriteParameter(CS_DEVICE_TYPE_ID, &deviceType);
                boolpredefPANID = true;
                uint16_tnwkPANID = 0x1000;
                CS_WriteParameter(CS_NWK_PREDEFINED_PANID_ID, &predefPANID);
                CS_WriteParameter(CS_NWK_PANID_ID, &nwkPANID);//add by jacky

                // 定義數(shù)據(jù)節(jié)點(diǎn)0
                apsDataReq.dstAddrMode = APS_SHORT_ADDRESS;
                apsDataReq.dstAddress.shortAddress = 0;
                apsDataReq.profileId = APP_PROFILE_ID;
                apsDataReq.dstEndpoint = APP_DATA_ENDPOINT;//0X20
                apsDataReq.clusterId = APP_CLUSTER_ID;
                apsDataReq.srcEndpoint = APP_DATA_ENDPOINT;//0X20
                apsDataReq.asdu = (uint8_t *)sensor_buf;
                apsDataReq.asduLength = sizeof(execute_buf);//傳輸數(shù)據(jù)
                apsDataReq.txOptions.acknowledgedTransmission = 0;
                apsDataReq.radius = 0;
                apsDataReq.APS_DataConf = apsDataReqConf;

                // 定義數(shù)據(jù)節(jié)點(diǎn)1
                apsDataReq1.dstAddrMode = APS_SHORT_ADDRESS;
                apsDataReq1.dstAddress.shortAddress = 0;
                apsDataReq1.profileId = APP_PROFILE_ID;
                apsDataReq1.dstEndpoint = 0x40;
                apsDataReq1.clusterId = APP_CLUSTER_ID;
                apsDataReq1.srcEndpoint = 0x40;
                apsDataReq1.asdu = (uint8_t *)execute_buf;
                apsDataReq1.asduLength = sizeof(execute_buf);//傳輸數(shù)據(jù)
                apsDataReq1.txOptions.acknowledgedTransmission = 0;
                apsDataReq1.radius = 0;
                apsDataReq1.APS_DataConf = apsDataReqConf1;

                appState = APP_JOINING_STATE;
                SYS_PostTask(APL_TASK_ID);
        }

初始化結(jié)束后會(huì)改變appState的狀態(tài)，appState = APP_JOINING_STATE; 進(jìn)行網(wǎng)絡(luò)的加入操作，使用SYS_PostTask(APL_TASK_ID);來投遞任務(wù)，讓系統(tǒng)再次調(diào)用APL_TaskHandler() 去執(zhí)行case APP_JOINING_STATE進(jìn)而去執(zhí)行startNetwork()函數(shù)。

startNetwork()創(chuàng)建一個(gè)定時(shí)器用來控制led的亮滅來表示網(wǎng)絡(luò)的連接狀態(tài)，在注冊(cè)一個(gè)網(wǎng)絡(luò)連接確認(rèn)的回調(diào)函數(shù)。

static void startNetwork(void)
        {
                blinkTimer.interval = BLINK_TIMER_INTERVAL;
                blinkTimer.mode = TIMER_REPEAT_MODE;
                blinkTimer.callback = blinkTimerFired;
                HAL_StartAppTimer(&blinkTimer);
                startNetworkReq.ZDO_StartNetworkConf = ZDO_StartNetworkConf;//回調(diào)函數(shù)
                ZDO_StartNetworkReq(&startNetworkReq);
        }

回調(diào)函數(shù)中，主要是判斷zigbee網(wǎng)絡(luò)連接，連接成功，關(guān)閉定時(shí)器和注冊(cè)網(wǎng)絡(luò)節(jié)點(diǎn)。

static void ZDO_StartNetworkConf(ZDO_StartNetworkConf_t* conf)
        {
                HAL_StopAppTimer(&blinkTimer); //add by lht
                if (ZDO_SUCCESS_STATUS == conf->status)
                {
                        appState = APP_JOINED_STATE;
                        // 注冊(cè)網(wǎng)絡(luò)節(jié)點(diǎn)0
                        registerDataEndpointReq.simpleDescriptor = &dataEndpoint;
                        registerDataEndpointReq.APS_DataInd = APS_DataIndData;
                        APS_RegisterEndpointReq(&registerDataEndpointReq);

                        // 注冊(cè)網(wǎng)絡(luò)節(jié)點(diǎn)1
                        registerDataEndpointReq1.simpleDescriptor = &dataEndpoint1;
                        registerDataEndpointReq1.APS_DataInd = APS_DataIndData1;
                        APS_RegisterEndpointReq(&registerDataEndpointReq1);

                }
                else
                {
                        appState = APP_JOINING_STATE;
                }
                SYS_PostTask(APL_TASK_ID);
        }

zigbee數(shù)據(jù)發(fā)送函數(shù)：

static void sendDataBlock(unsigned char channel)
        {
                switch(channel)
                {
                        case Sensor:
                        APS_DataReq(&apsDataReq);
                        break;
                        case Execute:
                        APS_DataReq(&apsDataReq1);
                        break;
                        default:
                        break;
                }
        }

zigbee數(shù)據(jù)接受函數(shù)：

static void APS_DataIndData(APS_DataInd_t *ind) //data come from sensor module
        {
                zigbee_in_flag = 1;
                memcpy(&sensor_data[1],ind->asdu, 18);
                sensor_from_address = ind->srcAddress.shortAddress;
        }
        static void APS_DataIndData1(APS_DataInd_t *ind) //data come from excute module
        {
                memcpy(init_data,ind->asdu, 30);
                to_excute_address = ind->srcAddress.shortAddress;
                if(init_data[0] == 0xaa)
                {
                        enable_count = 1;
                        excute_open = 1;
                }
        }

在zigbee的節(jié)點(diǎn)函數(shù)APL_TaskHandler()，與協(xié)調(diào)器程序中多的狀態(tài)是：離開zigbee網(wǎng)絡(luò)，定義的宏是APP_LEAVE_STATE。

voidAPL_TaskHandler(void)
        {
                switch (appState)
                {
                        case APP_INITIAL_STATE:
                    &nbnbsp;   initHardware();
                        initNetwork();
                        break;
                        case APP_JOINING_STATE:
                        startNetwork();
                        break;
                        case APP_JOINED_STATE:
                        break;
                        case APP_LEAVE_STATE:
   &nbsnbsp;                    leaveNetwork();
                        break;
                        case APP_LEAVING_STATE:
                        break;
                        default:
                        break;
                }
        }