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stm32mp1

A collection of 7 posts

TCXO

TCXO RTC Raspberry Pi Hat, part 2

The motivation for this project is NTP servers in datacenters - it can be expensive to get a GPS antenna on top of other people's buildings with a wire running down into your

  • Dan Drown
4 min read
ntp

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 involvedEmbedded NTP

  • Dan Drown
3 min read
ntp

STM32MP1 NTP server, part 3

Previous posts: part 1, part 2, NTP client The NTP client confirmed that there was a 943ns difference between my two NTP servers.  Now, to investigate where it is coming from. ChangesI'll start

  • Dan Drown
3 min read
ntp

Embedded NTP client/NTP interleaved mode, part 3

Previous posts: part 1, 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

  • Dan Drown
5 min read
stm32mp1

STM32MP1 NTP server, part 2

Previous post: https://blog.dan.drown.org/stm32mp1-ntp-server/ I figured out my offset problem, which was not a PLL problem like I thought. Connman has a NTP client enabled by default:(The distro

  • Dan Drown
2 min read
ntp

STM32MP1 NTP server

Previous post: Debian for STM32MP1 NIC Hardware TimestampsFirst step: enable hardware timestamps in chrony.conf: chrony configuration for hardware timestampsNext, enable chrony's measurements log, and verify it's using hardware timestamps (H) not kernel

  • Dan Drown
2 min read
stm32

Debian for STM32MP1

I bought a STM32MP1 dev board 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

  • Dan Drown
2 min read
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