12 - 利用LinuxPTP进行时间同步(软/硬件时间戳) - 研一

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已于 2022-04-21 14:54:32 修改 · 5.9w 阅读

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#OAI #SDR #通信

于 2019-01-10 18:18:38 首次发布

拖了很久，花了半天测了一下，效果还行，可以脱离隔壁的原子钟做开发测试了。

参考文献： http://linuxptp.sourceforge.net/

0、硬件支持

查看网卡是否支持软硬件时间戳：
sudo ethtool -T eno1

Time stamping parameters for eno1:
Capabilities:
	hardware-transmit     (SOF_TIMESTAMPING_TX_HARDWARE)
	software-transmit     (SOF_TIMESTAMPING_TX_SOFTWARE)
	hardware-receive      (SOF_TIMESTAMPING_RX_HARDWARE)
	software-receive      (SOF_TIMESTAMPING_RX_SOFTWARE)
	software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
	hardware-raw-clock    (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
	off                   (HWTSTAMP_TX_OFF)
	on                    (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
	none                  (HWTSTAMP_FILTER_NONE)
	all                   (HWTSTAMP_FILTER_ALL)
	ptpv1-l4-sync         (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
	ptpv1-l4-delay-req    (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
	ptpv2-l4-sync         (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
	ptpv2-l4-delay-req    (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
	ptpv2-l2-sync         (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
	ptpv2-l2-delay-req    (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
	ptpv2-event           (HWTSTAMP_FILTER_PTP_V2_EVENT)
	ptpv2-sync            (HWTSTAMP_FILTER_PTP_V2_SYNC)
	ptpv2-delay-req       (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)

软件时间戳需要包括参数
SOF_TIMESTAMPING_SOFTWARE
SOF_TIMESTAMPING_TX_SOFTWARE
SOF_TIMESTAMPING_RX_SOFTWARE
硬件时间戳需要包括参数
SOF_TIMESTAMPING_RAW_HARDWARE
SOF_TIMESTAMPING_TX_HARDWARE
SO