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標題: Zigbee 設置信道，PANID，發射功率 [打印本頁]

作者: das 時間: 2015-4-18 00:31
標題: Zigbee 設置信道，PANID，發射功率
現對z-stack里幾個網絡參數的設置以及如何獲取總結一下。

信道配置：

Zigbee在3個頻段定義了27個物理信道：868MHz頻段中定義了1個信道，915MHz頻段中定義了2個信道，信道間隔為2MHz，2.4GHz頻段上定義了16個信道，信道間隔為5MHz.

信道編號	中心頻率/MHz	信道間隔/MHz	頻率上限/MHz	頻率下限/MHz
k=0	868.3	--	868.6	868.0
k=1,2,…,10	906+2(k-1)	2	928.0	902．0
k=11,12,…,26	2401+5(k-11)	5	2483.5	2400.0

Z-stack中可以在f8wConfig.cfg里設置信道，相關部分如下：

/* Default channel is Channel 11 - 0x0B */

// Channels are defined in the following:

// 0 : 868 MHz 0x00000001

// 1 - 10 : 915 MHz 0x000007FE

// 11 - 26 : 2.4 GHz 0x07FFF800

//-DMAX_CHANNELS_868MHZ 0x00000001

//-DMAX_CHANNELS_915MHZ 0x000007FE

//-DMAX_CHANNELS_24GHZ 0x07FFF800

//-DDEFAULT_CHANLIST=0x04000000 // 26 - 0x1A

//-DDEFAULT_CHANLIST=0x02000000 // 25 - 0x19

//-DDEFAULT_CHANLIST=0x01000000 // 24 - 0x18

//-DDEFAULT_CHANLIST=0x00800000 // 23 - 0x17

//-DDEFAULT_CHANLIST=0x00400000 // 22 - 0x16

//-DDEFAULT_CHANLIST=0x00200000 // 21 - 0x15

//-DDEFAULT_CHANLIST=0x00100000 // 20 - 0x14

//-DDEFAULT_CHANLIST=0x00080000 // 19 - 0x13

//-DDEFAULT_CHANLIST=0x00040000 // 18 - 0x12

//-DDEFAULT_CHANLIST=0x00020000 // 17 - 0x11

//-DDEFAULT_CHANLIST=0x00010000 // 16 - 0x10

//-DDEFAULT_CHANLIST=0x00008000 // 15 - 0x0F

//-DDEFAULT_CHANLIST=0x00004000 // 14 - 0x0E

//-DDEFAULT_CHANLIST=0x00002000 // 13 - 0x0D

//-DDEFAULT_CHANLIST=0x00001000 // 12 - 0x0C

-DDEFAULT_CHANLIST=0x00000800 // 11 - 0x0B 這里默認使用的是編號為11的信道

當建網過程開始后，網絡層將請求MAC層對規定的信道或由物理層默認的有效信道進行能量檢測掃描，以檢測可能的干擾。網絡層管理實體對能量掃描的結果以遞增的方式排序，丟棄那些能量值超出可允許能量水平的信道，然后再由網絡層管理實體執行一次主動掃描，結合檢查PAN描述符，對剩下的信道選擇一個合適的建立網絡。

若要在應用中查看信道，可以這樣獲得，_NIB.nwkLogicalChannel，讀取這個就OK了。（NIB -NWK Information base-. 其中包含一些網絡屬性 PANID ,NETWORK ADDRESS 等等。其中_nib.nwkpanID是本網的ID標識，_NIB.extendedPANID按照字面意思是外網ID）

PANID:

在確定信道以后，下一步將是確定PANID，如果ZDAPP_CONFIG_PAN_ID被定義為0xFFFF，那么協調器將根據自身的IEEE地址建立一個隨機的PANID（0～0x3FFF），如ZDAPP_CONFIG_PAN_ID沒有被定義為0xFFFF，那么網絡的PANID將由ZDAPP_CONFIG_PAN_ID確定。

“如果ZDAPP_CONFIG_PAN_ID被定義為0xFFFF，那么協調器將根據自身的IEEE地址建立一個隨機的PANID（0～0x3FFF）”這句話怎么理解呢，我經過試驗發現，這個隨機的PANID并非完全隨機，它有規律，與IEEE地址有一定的關系：要么就是IEEE地址的低16位，要么就是一個與IEEE地址低16位非常相似的值。如IEEE地址為0x8877665544332211，PANID很有可能就是2211，或相似的值；IEEE地址為0x8877665544337777，PANID很有可能就是3777，或其它相似的值；

Z-stack中相關部分代碼如下：

/* Define the default PAN ID.

* Setting this to a value other than 0xFFFF causes

* ZDO_COORD to use this value as its PAN ID and

* Routers and end devices to join PAN with this ID

-DZDAPP_CONFIG_PAN_ID=0xFFFF

若要在應用中查看PANID可以這樣獲得，_NIB.nwkPanId，讀取這個就OK了。

發射功率：

傳送范圍的大小是和發射功率還有信道環境有關, 傳送速率和傳送范圍之間沒有直接聯系。所以呢，適當的增大發射功率可增大傳送范圍。但也是有一定的限制的。具體詳見datasheet。

在mac_radio_def.h里有可以設置：

#define MAC_RADIO_CHANNEL_DEFAULT 11

#define MAC_RADIO_TX_POWER_DEFAULT 0x1F

#define MAC_RADIO_TX_POWER_MAX_MINUS_DBM 25

這些只是舉例說明一下，這些參數的意義，以及在z-stack里的什么地方修改。還有很多其它的參數，可以查看相關的源文件。

［mac_radio_def.h］

#define MAC_RADIO_SET_CHANNEL(x) st( FSCTRLL = FREQ_2405MHZ + 5 * ((x) - 11); )

#define MAC_RADIO_SET_TX_POWER(x) st( TXCTRLL = x; )

#define MAC_RADIO_SET_PAN_ID(x) st( PANIDL = (x) & 0xFF; PANIDH = (x) >> 8; )

［mac_radio.c］

void macRadioInit(void)

{

/* variable initialization for this module */

reqChannel = MAC_RADIO_CHANNEL_DEFAULT;

macPhyChannel = MAC_RADIO_CHANNEL_DEFAULT;

reqTxPower = MAC_RADIO_TX_POWER_DEFAULT;

macPhyTxPower = MAC_RADIO_TX_POWER_DEFAULT;

}

［mac_low_level.h］

uint8 macRadioRandomByte(void);

void macRadioSetPanCoordinator(uint8 panCoordinator);

void macRadioSetPanID(uint16 panID);

void macRadioSetShortAddr(uint16 shortAddr);

void macRadioSetIEEEAddr(uint8 * pIEEEAddr);

void macRadioSetTxPower(uint8 txPower);

void macRadioSetChannel(uint8 channel);

void macRadioStartScan(uint8 scanType);

void macRadioStopScan(void);

void macRadioEnergyDetectStart(void);

uint8 macRadioEnergyDetectStop(void);

設置發射功率：

CC2530 設置RF的發送功率寄存器為TXPOWER，全局搜索一下可以看到以下代碼

[csharp] view plaincopy

#define MAC_RADIO_SET_PAN_COORDINATOR(b) st( FRMFILT0 = (FRMFILT0 & ~PAN_COORDINATOR) | (PAN_COORDINATOR * (b!=0)); )
#define MAC_RADIO_SET_CHANNEL(x) st( FREQCTRL = FREQ_2405MHZ + 5 * ((x) - 11); )
#define MAC_RADIO_SET_TX_POWER(x) st( TXPOWER = x; )
#define MAC_RADIO_SET_PAN_ID(x) st( PAN_ID0 = (x) & 0xFF; PAN_ID1 = (x) >> 8; )
#define MAC_RADIO_SET_SHORT_ADDR(x) st( SHORT_ADDR0 = (x) & 0xFF; SHORT_ADDR1 = (x) >> 8; )

繼續跟蹤MAC_RADIO_SET_TX_POWER

[csharp] view plaincopy

/**************************************************************************************************
* @fn macRadioUpdateTxPower
*
* @brief Update the radio's transmit power if a new power level has been requested
*
* @param reqTxPower - file scope variable that holds the last request power level
* macPhyTxPower - global variable that holds radio's set power level
*
* @return none
**************************************************************************************************
*/
MAC_INTERNAL_API void macRadioUpdateTxPower(void)
{
halIntState_t s;
/*
* If the requested power setting is different from the actual radio setting,
* attempt to udpate to the new power setting.
*/
HAL_ENTER_CRITICAL_SECTION(s);
if (reqTxPower != macPhyTxPower)
{
/*
* Radio power cannot be updated when the radio is physically transmitting.
* If there is a possibility radio is transmitting, do not change the power
* setting. This function will be called again after the current transmit
* completes.
*/
if (!macRxOutgoingAckFlag && !MAC_TX_IS_PHYSICALLY_ACTIVE())
{
/*
* Set new power level; update the shadow value and write
* the new value to the radio hardware.
*/
macPhyTxPower = reqTxPower;
MAC_RADIO_SET_TX_POWER(macPhyTxPower);
}
}
HAL_EXIT_CRITICAL_SECTION(s);
}

在這里我們可以看到TXPOWER的設置值實際上應該是reqTxOower，讓我看一下reqTxOower在哪里設置吧，繼續跟蹤可以發現reqTxPower在函數MAC_INTERNAL_API uint8 macRadioSetTxPower(uint8 txPower)中得到更新，一路跟蹤下去可以在函數uint8 MAC_MlmeSetReq(uint8 pibAttribute, void *pValue)看到以下代碼

[csharp] view plaincopy

case MAC_PHY_TRANSMIT_POWER:
/* Legacy transmit power attribute */
#if !defined HAL_MAC_USE_REGISTER_POWER_VALUES && \
!defined HAL_PA_LNA && !defined HAL_PA_LNA_CC2590
/* Legacy transmit power attribute value for CC2530 alone,
* or runtime selection support build means a negative absolute value.
* However, when used as register power values or
* with HAL_PA_LNAxxx definition (without runtime selection)
* the attribute value is not a negative absolute value. */
macPib.phyTransmitPower = (uint8)(-(int8)macPib.phyTransmitPower);
#endif /* !defined HAL_MAC_USE_REGISTER_POWER_VALUES && ... */
/* pass through to next case -- do not break*/
#endif /* MAC_OBSOLETE_PHY_TRANSMIT_POWER */
case MAC_PHY_TRANSMIT_POWER_SIGNED:
(void)macRadioSetTxPower(macPib.phyTransmitPower);
break;

到這里為止Z-Stack發送功率的設置流程已經明確，但是我找遍Z-Stack的工程也沒有找到調用uint8 MAC_MlmeSetReq(uint8 pibAttribute, void *pValue)的地方想來應該是封裝在TI提供的LIB文件中了，
修改TXPOWER的方法有兩種：一、在uint8 macRadioSetTxPower(uint8 txPower)函數中通過修改macPib.phyTransmitPower = (uint8)(-(int8)macPib.phyTransmitPower);的值來修改TXPOWER參數，系統復位后將使用調用該函數設置發送功率。修改macPib.phyTransmitPower = (uint8)(-(int8)macPib.phyTransmitPower);可以通過修改以下結構體中的紅色部分來修改

[csharp] view plaincopy

static CODE const macPib_t macPibDefaults =
{
54, /* ackWaitDuration */
FALSE, /* associationPermit */
TRUE, /* autoRequest */
FALSE, /* battLifeExt */
6, /* battLifeExtPeriods */
NULL, /* *pMacBeaconPayload */
0, /* beaconPayloadLength */
MAC_BO_NON_BEACON, /* beaconOrder */
0, /* beaconTxTime */
0, /* bsn */
{0, SADDR_MODE_EXT}, /* coordExtendedAddress */
MAC_SHORT_ADDR_NONE, /* coordShortAddress */
0, /* dsn */
FALSE, /* gtsPermit */
4, /* maxCsmaBackoffs */
3, /* minBe */
0xFFFF, /* panId */
FALSE, /* promiscuousMode */
FALSE, /* rxOnWhenIdle */
MAC_SHORT_ADDR_NONE, /* shortAddress */
MAC_SO_NONE, /* superframeOrder */
0x01F4, /* transactionPersistenceTime */
FALSE, /* assocciatedPanCoord */
5, /* maxBe */
1220, /* maxFrameTotalWaitTime */
3, /* maxFrameRetries */
32, /* ResponseWaitTime */
0, /* syncSymbolOffset */
TRUE, /* timeStampSupported */
FALSE, /* securityEnabled */
/* Proprietary */
#if defined (HAL_PA_LNA)
19, /* phyTransmitPower for CC2591 */
#elif defined (HAL_PA_LNA_CC2590)
11, /* phyTransmitPower for CC2590 */
#else
0, /* phyTransmitPower without frontend */
#endif
MAC_CHAN_11, /* logicalChannel */
{0, SADDR_MODE_EXT}, /* extendedAddress */
1, /* altBe */
MAC_BO_NON_BEACON, /* deviceBeaconOrder */
};

該值可以再-22到3之間變化具體可以參考

[csharp] view plaincopy

const uint8 CODE macRadioDefsTxPwrBare[] =
{
3, /* tramsmit power level of the first entry */
(uint8)(int8)-22, /* transmit power level of the last entry */
/* 3 dBm */ 0xF5, /* characterized as 4.5 dBm in datasheet */ //0
/* 2 dBm */ 0xE5, /* characterized as 2.5 dBm in datasheet */
/* 1 dBm */ 0xD5, /* characterized as 1 dBm in datasheet */
/* 0 dBm */ 0xD5, /* characterized as 1 dBm in datasheet */
/* -1 dBm */ 0xC5, /* characterized as -0.5 dBm in datasheet */
/* -2 dBm */ 0xB5, /* characterized as -1.5 dBm in datasheet */
/* -3 dBm */ 0xA5, /* characterized as -3 dBm in datasheet */
/* -4 dBm */ 0x95, /* characterized as -4 dBm in datasheet */
/* -5 dBm */ 0x95,
/* -6 dBm */ 0x85, /* characterized as -6 dBm in datasheet */
/* -7 dBm */ 0x85,
/* -8 dBm */ 0x75, /* characterized as -8 dBm in datasheet */
/* -9 dBm */ 0x75,
/* -10 dBm */ 0x65, /* characterized as -10 dBm in datasheet */
/* -11 dBm */ 0x65,
/* -12 dBm */ 0x55, /* characterized as -12 dBm in datasheet */
/* -13 dBm */ 0x55,
/* -14 dBm */ 0x45, /* characterized as -14 dBm in datasheet */
/* -15 dBm */ 0x45,
/* -16 dBm */ 0x35, /* characterized as -16 dBm in datasheet */
/* -17 dBm */ 0x35,
/* -18 dBm */ 0x25, /* characterized as -18 dBm in datasheet */
/* -19 dBm */ 0x25,
/* -20 dBm */ 0x15, /* characterized as -20 dBm in datasheet */
/* -21 dBm */ 0x15,
/* -22 dBm */ 0x05 /* characterized as -22 dBm in datasheet */
};

二、就是使用MT功能

[csharp] view plaincopy

void MT_SysSetTxPower(uint8 *pBuf)
{
/* A local variable to hold the signed dBm value of TxPower that is being requested. */
uint8 signed_dBm_of_TxPower_requeseted;
/*
* A local variable to hold the signed dBm value of TxPower that can be set which is closest to
* the requested dBm value of TxPower, but which is also valid according to a complex set of
* compile-time and run-time configuration which is interpreted by the macRadioSetTxPower()
* function.
*/
uint8 signed_dBm_of_TxPower_range_corrected;
/* Parse the requested dBm from the RPC message. */
signed_dBm_of_TxPower_requeseted = pBuf[MT_RPC_POS_DAT0];
/*
* MAC_MlmeSetReq() will store an out-of-range dBm parameter value into the NIB. So it is not
* possible to learn the actual dBm value that will be set by invoking MACMlmeGetReq().
* But this actual dBm value is a required return value in the SRSP to this SREQ. Therefore,
* it is necessary to make this redundant pre-call to macRadioSetTxPower() here in order to run
* the code that will properly constrain the requested dBm to a valid range based on both the
* compile-time and the run-time configurations that affect the available valid ranges
* (i.e. MAC_MlmeSetReq() itself will invoke for a second time the macRadioSetTxPower() function).
*/
signed_dBm_of_TxPower_range_corrected = macRadioSetTxPower(signed_dBm_of_TxPower_requeseted);
/*
* Call the function to store the requested dBm in the MAC PIB and to set the TxPower as closely
* as possible within the TxPower range that is valid for the compile-time and run-time
* configuration.
*/
(void)MAC_MlmeSetReq(MAC_PHY_TRANSMIT_POWER_SIGNED, &signed_dBm_of_TxPower_requeseted);
/* Build and send back the response that includes the actual dBm TxPower that can be set. */
MT_BuildAndSendZToolResponse(((uint8)MT_RPC_CMD_SRSP | (uint8)MT_RPC_SYS_SYS),
MT_SYS_SET_TX_POWER, 1,
&signed_dBm_of_TxPower_range_corrected);
}

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