SWCU192 User guide | 德州仪器 TI.com.cn

SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7

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26.8.8.2 Connectable Directed Advertiser Command

A connectable directed advertiser operation is started by a CMD_BLE_ADV_DIR command. In the command structure, it shall have a pParams parameter of the type defined in Table 26-98 and a pOutput parameter of the type defined in Table 26-110. The operation starts with transmission and operates as described in Section 26.8.8 with some modifications as described in the following list.

For the directed advertiser, pParams->pWhiteList shall point to a buffer containing only the device address of the device to which to connect. The address type of the peer shall be given in pParams->advConfig.peerAddrType.

The first transmit operation will send an ADV_DIRECT_IND packet. The radio CPU shall construct this packet as follows:

In the header, the PDU Type bits shall be 0001b as shown in Table 26-132.
The TxAdd bit shall be as in pParams->advConfig.deviceAddrType.
The RxAdd bit shall be as in pParams->advConfig.peerAddrType (if the least significant bit of pParams->pWhiteList is 1, the RxAdd bit is inverted, see Section 26.8.17).
The ChSel bit shall be 1 if pParams->advConfig.chSel is 1; otherwise, ChSel shall be 0.
The length shall be calculated from the size of the advertising data, which means that it shall be pParams->advLen + 12.
The RFU bit shall be 0.
The payload shall start with the 6-byte device address, which shall be read from pParams->pDeviceAddress, followed by the 6-byte peer address read from pParams->pWhiteList.
By the Bluetooth low energy specification, there shall be no more payload, but a noncompliant message may be constructed by setting pParams->advLen to a nonzero value. If so, the rest of the payload shall be read from the pParams->pAdvData buffer.

The receiver is started after the ADV_DIRECT_IND packet is transmitted as described in Section 26.8.8, and received packets are processed as described there. Instead of being checked against the whitelist, the received TargetA field and TxAdd bit are checked against pParams->pWhiteList and pParams->advConfig.peerAddrType, respectively.

A directed advertiser operation shall end with one of the statuses listed in Table 26-136. The status field of the command structure after the operation is ended indicates the reason why the operation ended. In all cases, a Command_Done interrupt is raised. In each case, the result of TRUE, FALSE, or ABORT is indicated, which will decide the next action.

Table 26-136 End of Directed Advertiser Operation

Condition	Status Code	Result
Performed Action 1 after running receiver	BLE_DONE_OK	TRUE
Performed Action 3 after running receiver	BLE_DONE_RXERR	TRUE
Performed Action 4 after running receiver if pParams->advConfig.chSel = 0 or the ChSel bit of the received CONNECT_IND is 1	BLE_DONE_CONNECT	FALSE
Performed Action 4 after running receiver if pParams->advConfig.chSel = 1 and the ChSel bit of the received CONNECT_IND is 0	BLE_DONE_CONNECT_CHSEL0	FALSE
Performed Action 5 after running receiver	BLE_DONE_NOSYNC	TRUE
Observed trigger indicated by pParams->endTrigger, then performed Actions 1, 3, or 5	BLE_DONE_ENDED	FALSE
Observed CMD_STOP, then performed Actions 1, 3, or 5	BLE_DONE_STOPPED	FALSE
Received CMD_ABORT	BLE_DONE_ABORT	ABORT
No space in RX buffer to store received packet	BLE_ERROR_RXBUF	FALSE
Illegal value of channel	BLE_ERROR_PAR	ABORT
Advertising data length field has illegal value	BLE_ERROR_PAR	ABORT