Sean Cross
Product Development at Chumby
Singapore
Summary
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RockstarSean Cross is a product development engineer based in Singapore with 16 years of hands-on experience designing and shipping hardware-software products from prototype through manufacture and market. He blends embedded systems expertise with systems-level software—contributing to open-source projects like VexRiscv, LiteX, Yosys and Rust—often tackling low-level CPU pipeline, bus/debug bridging, and build-system portability issues. Sean’s work shows deep familiarity with FPGA toolchains, in-circuit debugging (OpenOCD/Wishbone), USB stacks, and microcontroller debug support, enabling pragmatic fixes that improve flexibility and cross-platform compatibility. At Foosn he leads both firmware and hardware development, while longstanding open-source contributions reveal an ability to navigate complex toolchains and chipset quirks. Notably, he has fixed subtle pipeline and MMU generation errors in VexRiscv and implemented live GDB debugging bridges for FPGA cores—details that reflect system-architecture instincts beyond routine firmware work. Colleagues rely on him for pragmatic engineering that turns fragile prototypes into manufacturable, debuggable products.
16 years of coding experience
Github Skills (63)
debugging10
caching10
verilog10
debug10
system-programming10
multiplatform10
py10
python10
cortex10
risc-v10
cpu-architecture10
winusb10
usb10
cross-platform10
c1110
Programming languages (32)
Github contributions (5)
enjoy-digital/litex
Jun 2018 - Oct 2022
Build your hardware, easily!
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:5 reviews, 50 commits, 27 PRs in 4 years 4 months
Contributions summary:Sean Cross contributed significantly to the Litex project, focusing on low-level hardware integration and debugging. His work included adding support for debugging the VexRiscv CPU core, allowing for in-circuit live debugging via GDB. He implemented a bridge between OpenOCD and the Wishbone bus, and fixed issues related to reading data registers. He also refactored the Wishbone bus interaction, and added documentation to many hardware modules.
vhdlsystem-on-chipedasochardware
adafruit/circuitpython
Mar 2020 - Nov 2021
CircuitPython - a Python implementation for teaching coding with microcontrollers
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:1 review, 18 PRs, 115 comments in 1 year 8 months
Contributions summary:Sean focused on adding support for the Fomu FPGA board and the Simmel tracking board to the CircuitPython project. They implemented various features, including enabling ITCM memory regions for Fomu, adding a new OS module, and supporting the MX25R1635F flash chip. They also modified the build process to incorporate these new boards and enabled/disabled certain modules based on the target platform's resource constraints. Furthermore, the user added new functionality for anonymous advertising using BLE.
pythonpython-implementationteachingmicrocontrollerpython3
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