基于mpthompson 的项目基础上做的，将STM32H7 的PTP 底层驱动直接地通过访问底层硬件寄存器完成，支持lwIP 2.0 ，使用UDP 组播方式（IGMP 协议） 实现PTPD 协议。

IEEE 1588 PTP daemon for STM32H7 and ATSAME70 microcontrollers. The software is tested to work with LWIP 2.x. Enable IGMP in LWIP and make sure it is working. Typically this is done by defining LWIP_IGMP to 1 in lwipopts.h. You typically need to enable IGMP in your network interface as well (for example netif->flags |= NETIF_FLAG_IGMP).

2023年10月6日 · ST2110是一种面向未来的IP视频传输标准，它基于精确 时间协议 （PTP）进行时间同步，支持不压缩的有效视频和PCM数字音频等多种媒体类型。 本系列包含的内容： ST2110-10 系统和定时协议：介绍ST2110-10标准中定义的传输层协议、数据报尺寸限制、 会话描述协议 要求和时钟及它们的定时关系。 ST2110-20 不压缩有效视频：解释ST2110-20标准中不压缩有效视频的概念和传输方式，以及如何在ST2110系统中实现不压缩视频的传输。 ST2110 …

IEEE 1588 PTP daemon for STM32H7 and ATSAME70 microcontrollers. The software is tested to work with LWIP 2.x. Enable IGMP in LWIP and make sure it is working. Typically this is done by defining LWIP_IGMP to 1 in lwipopts.h. You typically need to enable IGMP in your network interface as well (for example netif->flags |= NETIF_FLAG_IGMP).

2025年3月9日 · IGMP-Snooping，也即 IGMP 探测功能，主要用于解决二层网络的组播包泛洪问题。开启了 IGMP-snooping 功能的交换机可以将组播报文仅发送至特定端口。 这里新出现了2个概念： 路由器端口：从交换机的该端口可以路由器。交换机接受从该端口发来的组播报文的接口；

2018年3月12日 · But i have a problem, the switch seems to drop every ptp multicast packet. I have activated the general routing, routing on every interface, pim dense mode, igmp. In addition i can see the ptp multicast group on "routing/multicast/mroute table" with the right interface/ip source. Any advises will be welcome. Best regards

2021年5月10日 · With IP, Precession Time Protocol (PTP) is leveraged to distribute time. For details on how PTP works on an Ethernet switch, refer to this white paper on IEEE 1588 PTP on the Cisco Nexus ® 3100 Platform and 9000 Series Switches. SMPTE 2059-2 and AES67 are most commonly used profiles in the media industry.

2021年12月7日 · Precision Time Protocol (PTP) is defined in IEEE 1588 as Precision Clock Synchronization for Networked Measurements and Control Systems, and was developed to synchronize the clocks in packet-based networks that include distributed device clocks of varying precision and stability.

2024年12月19日 · The PTP protocol uses the following multicast addresses: 224.0.1.129; 224.0.0.107; sfptpd will join these groups and periodically renew group interest using the IGMP protocol. Use the Linux netstat -ng command or the following command to identify multicast groups joined on the sfptpd interface:

The PTP daemon (PTPd) implements the precision time protocol (PTP) as defined in the IEEE1588 specification. The PTPd Version 1 implements IEEE 1588-2002 compliant functionality, and the PTPd Version 2 implements newer IEEE 1588-2008 specification. PTPd was developed to provide a precise time coordination of LAN connected computers.