1/ I was running PSRAM wrong on my RP2350 boards. I never switched the chip into Quad mode, so it was talking over one data line instead of four. Fixing that, and picking the right clock, made my write test 5.3x faster. 🧵
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8,000 subscribers on YouTube! 🎉
Thank you to everyone building along with me: Picos, RP2350s, droids, radar skulls and now a snowman.
Livestream party on Sun 29 Nov. What should I build in 2027?
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Your car has an entire computer network running underneath the dashboard. And most drivers have absolutely no idea how it works.
It's called CAN Bus (Controller Area Network). It connects the Engine Control Unit (ECU), ABS, airbags, transmission, steering, sensors and dozens of other electronic modules through just TWO communication wires.
But here's where automotive engineering gets interesting.
CAN Bus has no built-in message authentication. No native encryption. No mechanism to verify whether a message actually came from the ECU claiming to have sent it.
That opens the door to CAN Bus message spoofing, replay attacks, traffic sniffing, frame injection and Denial-of-Service (DoS) attacks.
An attacker who gains access to the vehicle's internal network may be able to inject malicious messages and interfere with legitimate ECU communication.
And this isn't just theoretical research. In September 2026, Georgia Tech researchers reported seven security flaws in CAN XL, the next-generation automotive communication standard.
So how does CAN arbitration actually work? Why do lower message IDs win? What are dominant and recessive bits? How do CRC, bit stuffing, error frames and fault confinement work? And where exactly do the security weaknesses emerge?
We break down the entire CAN Bus architecture, from the physical layer to real-world automotive cybersecurity attacks.
If you work in embedded systems, automotive engineering, ECU development or cybersecurity, this is worth understanding.
Read the complete technical guide 👇
https://thecybersecguru.com/glossary/can-bus-explained/#CANBus #AutomotiveCybersecurity #EmbeddedSystems #CyberSecurity