Liam Fraser
Engineer at Raspberry Pi Trading
Greater Cambridge Area United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolLiam Fraser is an embedded systems engineer with 12 years’ experience specializing in USB and low-level firmware for microcontrollers, currently working at Raspberry Pi Trading in the Greater Cambridge area. He has a strong track record contributing to high-profile open-source projects for the RP2040, including fixes to USB enumeration, DPRAM/SVD definitions, PLL stability and host-controller logic in tinyusb. Prior to Raspberry Pi he spent four years as a programmer at Mythic Beasts and holds a BSc in Computer Science from the University of York. Liam combines pragmatic hardware-level debugging with careful refactoring and build-tool fixes, and often addresses subtle alignment and interrupt-priority issues that reveal deep platform knowledge.
12 years of coding experience
4 years of employment as a software developer
Bachelor of Science (BS), Computer Science, Bachelor of Science (BS), Computer Science at University of YorkWinstanley College, Billinge
Github Skills (17)
rp204010
firmware10
winusb10
usb10
c1110
microcontroller10
c1710
sys10
embedded10
abstraction-layer9
time-management9
clock9
hal9
raspberry-pi9
cmake8
Programming languages (7)
Github contributions (5)
raspberrypi/pico-sdk
Jul 2021 - Jan 2023
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:99 reviews, 5 commits, 21 PRs in 1 year 6 months
Contributions summary:Liam primarily contributed to the RP2040 SDK, focusing on hardware-level changes and USB device functionality. Their work involved fixing USB enumeration issues by restoring GPIO states and modifying USB buffer status register definitions. They also added USB device DPRAM definitions to an SVD file and addressed issues related to USB serial communication, including disabling remote wakeup. Furthermore, they adjusted PLL settings for improved stability.
hathach/tinyusb
Feb 2021 - Jan 2022
An open source cross-platform USB stack for embedded system
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:17 reviews, 4 commits, 6 PRs in 10 months
Contributions summary:Liam primarily contributed to the RP2040 platform within the tinyusb project. Their work involved improvements to the HCD (Host Controller Driver), including correcting assertions and priorities for handling interrupts and buffers. They refactored code, fixed build configurations, and incorporated the use of custom memory copy functions to address alignment issues. These contributions indicate an effort to optimize the USB stack for the Raspberry Pi RP2040 microcontroller.
usb-drivestlinkdfumidiusb-hid
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