Ahoy-hoy

I am David Phillips. This is my perfect homepage and it's Keeping It Simple. It is a collection of static HTML pages generated from Markdown using a Git backend with magical hooks.

Latest antics and updated articles:

2022-12-17: Repairing an HP 53131A counter.
2022-07-24: Quick tip: enabling bash-like shell debug mode in U-Boot shell since the search engines didn't give this answer with my original search terms.
2022-07-24: A JTAG level shifter for 5V targets.
2022-04-03: Hand-rolling QorIQ PBL blobs to speed up hacking outside OpenWRT/Yocto.
2021-12-18: Passive bidirectional voltage level shifters and their effect on rise times.
2021-10-30: Documenting the bits in a common 8-digit 7-segment display.
2021-10-19: Building a fast edge generator/oscillator for TDR and distortion measurement.
2021-07-31: Fixing a USB-Ethernet adapter to run at USB 3.0 speeds.
2021-07-11: Flashing KT-Link buffer logic to Bus Blaster v3 to enable it to speak both SWD and JTAG.
2021-03-14: Prodding firmware with GDB/MI to enable more rapid UI testing, removing reliance on physical hardware.
2020-12-13: Running AVR code in QEMU: tightening development cycles for faster iteration.
2020-09-27: An improved vimclutch inspired by alevchuk's original.
2020-03-07: Modifying a Helios 44–2 M42 USSR lens to work on Nikon F-mount cameras.
2019-12-28: JTAG-ing software straight to RAM to decrease iteration time on U-Boot on a Raspberry Pi Zero.
2019-10-12: Fixing a faulty photographic extension tube. One tube had faulty electrical contacts due to a manufacturing defect.
2019-09-07: Getting media keys working in mpv on a Bluetooth headset with only two hiccups.
2019-06-08: 17 watt LED lights: After designing a PCB in 2017 and forgetting about it, I had it made and built the first of the prototypes.
2019-05-25: I made an oatmeal stout.
2019-04-07: Tonight, I rounded up a month of on-and-off bashing my head against a wall debugging intermittent GPS lock issues on my time server. The TL;DR: don't set Linux consoles where peripherals lie.
2019-01-26: I finally dumped my brain of the information I gathered configuring a text LCD on Linux the correct way.
2018-08-28: I'm finally allocating some small amounts of time to alarmd again
2018-04-30: Putting my simple rudder pedal ADC/USB thing into a permanent box
2018-04-01: Fixing more dangerous mains polarity on an imported Chinese appliance.
2018-02-02: Propagating and storing yeast, also known as ranching.
2017-12-29: Testing the performance and compression of xz when using more than one worker thread. The results surprised me.
2017-11-18: Building a Stratum 1 network time server using relatively cheap components.

Contact

If you can get my email address from my GPG key (2426 235A 7831 AA2F 56AF 4BC0 7BF3 D17D 0884 BF5B), you are human enough to send me an email
You might know me as dp on freenode or bq on libera.

Failing those two, I'm probably some guy you see on the train or in a lift. Or really any other mundane everyday scenario. Say "hi" next time you see me. I don't bite.

Things I Do

It's a list that keeps growing.

Programming
Electronics and RF
Indian food
Linux
Networking
C
Perl
Python
Heavy computation - CPU and GPGPU alike
Accidental and unnecessary SSE programming
Other things not worth mentioning