blobly_emb
public · MIT V · ThreadXThe embedded stack. A non-AUTOSAR automotive runtime: you write function blocks, and one config file wires them across cores, to the bus, and into a diagnostic server.
open source · MIT · written in V · rev 2026.10
Build the ECU.
Test it on the bus.
Open-source tools for building and testing automotive ECUs. blobly_emb turns one config file into ECU firmware: function blocks exchanging signals across cores, CAN and CAN-FD, a UDS server with fault memory, persistent data and a signed bootloader, on STM32H7 boards or a Linux host. blobly_net is the bus tester that goes with it, and it works just as well on its own, with the CAN adapter already on your desk.
A function block reports a fault or keeps a value across a power cycle by writing one of its ports; everything else is configuration. Start on Linux with virtual buses and no hardware, then run the same generated code on silicon.
1file
describes an ECU: signals, frames, DTCs, DIDs and what persists. The build generates the rest
5adapters
SocketCAN, Vector, Kvaser, PCAN and CANsub, with CAN-FD on all of them, or no hardware at all
4boards
STM32H7 boards in the reference system, composed from one
system.toml0bytes
dynamic allocation at runtime: no
malloc, no collector, checked in CIwhat is in it
blobly_emb
Signals, not calls
Function blocks declare what they read and write. The generated Loom wires them across cores and to the bus.
blobly_embOne file per system
Four boards composed in one system.toml. Cross-board wiring is derived and checked at build time.
Faults and persistent data
A DTC is a port write. A signal declared persist survives a power cycle. A UDS server reads both back.
Zero allocation
Fixed arrays and static tables only, enforced by a lint gate in CI. 200 blocks link to a 448 KB binary.
blobly_netAny adapter on the bench
SocketCAN, Vector, Kvaser, PCAN and CANsub, CAN-FD on all of them. Or no hardware at all.
blobly_netDiagnostics you can script
UDS from Lua: DTCs as records, DIDs, functional addressing over CAN and DoIP, and flashing.
blobly_netThe rest of the car
Simulated ECUs from a DBC, E2E stamped and checked, and rest-bus replay of MF4 recordings.
measuredNumbers from silicon
149 ns cross-core reads on a host, and what the H755's shared SRAM does differently.
two repositories, one wire format
blobly_net
public · MIT VThe bus tester that drives and watches it. CAN, CAN-FD, DoIP and SOME/IP; diagnostics, scripted tests, simulated ECUs and replay, from a GUI or headless in CI.