Topic

hardware timestamps

A collection of 11 issues

ch32v307 dev board, part 3

Next step on getting an NTP server running on the ch32v307 dev board is verifying the local clock. This is part of a series on the ch32v307 dev board There's two local clocks to consider: the PTP hardware timestamp clock, and the PPS input capture clock. I'

ch32v307 dev board

The CH32V307 microcontroller caught my interest because it has both IEEE 1588 timer hardware and the capability to connect via gigabit ethernet. If I ported my NTP server software to it, this would lower the round trip latency (excluding processing time) by around 10x. It's a RISC-V based

Teensy 4.1 ethernet

I'm a fan of the Teensy [https://www.pjrc.com/teensy/] line of microcontrollers. I have a whole pile of them for various projects. When I saw that 4.1 was combining a 600MHz processor, 1MB ram, 8MB flash, and ethernet with ieee1588/ptp, I was excited. The

Embedded NTP Server

Now that I got the results I wanted from my embedded NTP client [https://blog.dan.drown.org/embedded-ntp-client-ntp-interleaved-mode-part-5/], I wanted to convert it to an NTP server. I also wanted it to support interleaved NTP [https://tools.ietf.org/html/draft-ietf-ntp-interleaved-modes-03] mode, so it could have hardware timestamps for

Embedded NTP client/NTP interleaved mode, part 5

I'll test what happens when I plug my embedded NTP client directly into my NTP servers, bypassing the Ethernet switch. This ends my long running embedded NTP client series. The systems involved Embedded NTP client (Archmax): Part 4 [https://blog.dan.drown.org/embedded-ntp-client-ntp-interleaved-mode-part-4/], Part 3 [https://blog.

Embedded NTP client/NTP interleaved mode, part 3

Previous posts: part 1 [https://blog.dan.drown.org/archmax-ntp-client/], part 2 [https://blog.dan.drown.org/embedded-ntp-client-ntp-interleaved-mode-part-2/] In this post, I wrap up my embedded NTP client and use it to measure the difference between my other two NTP servers with hardware timestamps. Goal 1: synchronize the local clock

Debian for STM32MP1

I bought a STM32MP1 dev board [https://www.st.com/en/evaluation-tools/stm32mp157a-dk1.html] because it has a gigabit NIC with 1588 PTP timestamps as well as hardware timers that can timestamp PPS events without interrupt latency and jitter. I am hoping that it will both be better than the

Embedded NTP client/NTP interleaved mode, part 2

Hardware transmit timestamps added to NTP client.

Embedded NTP client/NTP interleaved mode

NTP client with hardware timestamps

APU2 NTP server

I bought an apu2c0. I believe it will make a better NTP server than my other NTP servers.