With V4.0.2.5 BLE scan never starts

ircama

<div class="quote"><blockquote><font size="2"><a href="https://forum.telink-semi.cn/forum.php?mod=redirect&goto=findpost&pid=102982&ptid=98909" target="_blank"><font color="#999999">ircama 发表于 2026-9-29 09:35</font></a></font> Thanks very much for your tests! The issue was in my application: the Link Layer was not initiali ...</blockquote></div> After further testing, I found that there were actually two separate issues in my application. The other changes were mainly optimizations and alignment with the reference `acl_central_demo`. 1. `blc_ll_init2MPhyCodedPhy_feature()` must be called when using LE Coded PHY. Without it, Coded PHY scanning does not work. 2. `blc_ll_initPeriodicAdvertisingSynchronization_module()` must not be enabled when periodic advertising synchronization is not being used. In my configuration, enabling it causes the BLE ISR to hang when a Coded PHY packet is received. The resolution of the issue in the [codedphyscanrepro.zip](https://forum.telink-semi.cn/forum.php?mod=attachment&aid=MjM1OXw2MWU2MTE4ZHwxNzkwMjc3Mzg0fDgzfDA%3D) example posted above can simply be achieved by commenting out ``` blc_ll_initPeriodicAdvertisingSynchronization_module(); ``` and recompiling. The relevant initialization is therefore: ``` blc_ll_initBasicMCU(); blc_ll_initStandby_module(mac_public); blc_ll_initExtendedScanning_module(); blc_ll_init2MPhyCodedPhy_feature();     /* Coded/2M are disabled by default */ blc_ll_initExtendedInitiating_module(); // blc_ll_initPeriodicAdvertisingSynchronization_module(); /* Not used; causes BLE ISR hang with Coded PHY RX */ blc_ll_initAclConnection_module(); blc_ll_setMaxConnectionNumber(4, 0); ``` The remaining changes that I did were not the root cause of the Coded PHY issue. <i class="pstatus"> 本帖最后由 ircama 于 2026-9-30 04:26 编辑 </i><br /> <br />