SWCU192 User guide

SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7

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26.8.11.1 Initiator Receiving Legacy Advertising Packets on Primary Channel

Legacy advertising packets (ADV_IND and ADV_DIRECT_IND), are accepted if running CMD_BLE_INITIATOR or if CMD_BLE5_INITIATOR on a primary advertising channel with 1-Mbps PHY. The operation is a described in the following list:

The bCrcErr and bIgnore bits are set according to the CRC result and the received message.
The parameter pParams->initConfig.bUseWhiteList determines if the initiator should try to connect to a specific device or against the whitelist. If this parameter is 0, the whitelist is not used, and pParams->pWhiteList shall point to a buffer containing only the device address of the device to connect to.
The address type of the peer shall be given in pParams->advConfig.peerAddrType (see also Section 26.8.17). Otherwise, pParams->pWhiteList shall point to a whitelist, and the received AdvA field in the message, along with the TxAdd bit of the received header is checked against whitelist as described in Section 26.8.14.
The filtering is summarized in Table 26-154.
For ADV_DIRECT_IND messages, the received TargetA field and RxAdd bit are checked against pParams->pDeviceAddress and pParams->initConfig.deviceAddrType, respectively (see also Section 26.8.17). Depending on this, the actions taken shall be as given in Table 26-155, where the definition of each action (including the value that will be used on bCrcErr and bIgnore) is given in Table 26-156.
If pParams->initConfig.bStrictLenFilter is 1, only length fields that are compliant with the Bluetooth low energy specification shall be considered valid.
For an ADV_DIRECT_IND, that means a length field of 12, and for ADV_IND messages it means a length field in the range 6–37.
If pParams->initConfig.bStrictLenFilter is 0, all received packets with a length field less than or equal to the maximum length of an advertiser packet shall be considered valid. If the length is not valid, the receiver shall be stopped.

Table 26-154 Filtering on Received Advertiser Address

bUseWhiteList	AdvA Matches Specific Peer Address	AdvA Matches Whitelist Entry with bEnable = 1	AdvA Matches Whitelist Entry with bIrkValid = 1	AdvA Filter Result
0	No	N/A	N/A	Reject
0	Yes	N/A	N/A	Accept
1	N/A	No	X	Reject
1	N/A	Yes	No	Accept
1	N/A	Yes	Yes	Reject

Table 26-155 Actions on Received Packets by Initiator

PDU Type	CRC result	AdvA filter result	TargetA match	Action No.
ADV_IND	OK	Reject	N/A	1
ADV_IND	OK	Accept	N/A	3
ADV_IND	NOK	X	N/A	4
ADV_DIRECT_IND	OK	Reject	X	1
ADV_DIRECT_IND	OK	Accept	No	1
ADV_DIRECT_IND	OK	Accept	Yes	3
ADV_DIRECT_IND	NOK	X	X	4
ADV*_IND with invalid length	X	X	X	5
Other (see also Section 26.8.11.2)	X	N/A	N/A	5

Table 26-156 Descriptions of the Actions to Take on Packets Received by Initiator

Action No.	bCrcErr	bIgnore	Description
1	0	1	Continue scanning
3	0	0	Send CONNECT_IND and end operation
4	1	0	Continue scanning
5	—	—	Stop receiving packet, then continue scanning

If the packet being received did not fit in the RX queue, the packet shall be received to the end, but the received bytes are not stored. If the packet would normally not have been discarded from the RX buffer, the operation shall end.

If the action from the received packet is 2, a CONNECT_IND (known as CONNECT_REQ in Bluetooth 4.0, 4.1, and 4.2 Specifications listed in Related Documentation) packet shall be transmitted. When transmitting a CONNECT_IND, the radio CPU shall construct this packet. In the header, the PDU Type bits shall be 0101b. The TxAdd bit shall be as in pParams->initConfig.deviceAddrType (if the least significant bit of pParams->pDeviceAddress is 1, the TxAdd bit is inverted, see Section 26.8.17). The RxAdd bit shall be as in the TxAdd field of the header of the received ADV_IND or ADV_DIRECT_IND message. The ChSel bit shall be 1 if pParams->initConfig.chSel is 1 ; otherwise, ChSel shall be 0. The length shall be calculated from the length of the LLData, meaning that it shall be pParams->connectReqLen + 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 the AdvA field of the received message. The rest of the payload shall be read from the pParams->pConnectData buffer. If pParams->initConfig.bDynamicWinOffset is 1, the radio CPU shall replace the bytes in the WinSize and WinOffset position (see Specification of the Bluetooth System, Version 5.0 listed in Related Documentation) with a calculated value as explained in Section 26.8.11.4. After a CONNECT_IND message is transmitted, the operation shall end. If pParams->initConfig.chSel is 1, the ChSel bit of the received ADV_IND or ADV_DIRECT_IND packet shall be checked to determine the end status; see Section 26.8.11.5.