Hard Embedded Systems Engineer questions

32 questions · 20 points each for a correct first answer.

1. 1.Random HardFaultsdebugging, arm-cortex-mhard
2. 2.Corruption in one taskrtos, memory-managementhard
3. 3.DMA data looks staledma, memory-managementhard
4. 4.Battery dies too fastlow-power, hardware-debugginghard
5. 5.Bricked devices after an updatebootloader, reliability, securityhard
6. 6.Reading a 32-bit fieldembedded-c, communication-protocolshard
7. 7.Missed motor control interruptsinterrupts, real-timehard
8. 8.Works at -O0, fails at -O2embedded-c, debugginghard
9. 9.An overflow check that vanishesembedded-c, undefined-behaviourhard
10. 10.Reading a float from a packetembedded-c, undefined-behaviourhard
11. 11.Packed struct crashes a Cortex-M0memory-layout, mcu-architecturehard
12. 12.ISR runs twice per eventinterrupts, mcu-architecturehard
13. 13.A lock-free ISR ring bufferconcurrency, data-structureshard
14. 14.Rate monotonic utilisation testreal-time-scheduling, rtoshard
15. 15.Taking a mutex in an ISRrtos, interruptshard
16. 16.Garbled log text from two tasksconcurrency, rtoshard
17. 17.A CAN node goes silentcan-bus, reliabilityhard
18. 18.I2C bus stuck after reseti2c, hardware-debugginghard
19. 19.A phantom 100 Hz signaladc, signal-processinghard
20. 20.Slow maths on a Cortex-M4Fembedded-c, performancehard
21. 21.Jitter in a control loop ISRperformance, interruptshard
22. 22.Proving the stack is big enoughmemory-management, functional-safetyhard
23. 23.Downgrading to signed old firmwaresecure-boot, embedded-securityhard
24. 24.Firmware read over SWDembedded-security, manufacturinghard
25. 25.Comparing a message authentication codeembedded-security, cryptographyhard
26. 26.FromISR call from a high priority ISRfreertos, interruptshard
27. 27.Flash wearing out in a weekflash-memory, reliabilityhard
28. 28.Settings lost on power cutflash-memory, reliabilityhard
29. 29.Sleep current 60 times too highlow-power-design, hardware-debugginghard
30. 30.The tick keeps waking the CPUfreertos, low-power-designhard
31. 31.Timestamp jumps backwardstimers, concurrencyhard
32. 32.Inverting a uint8_tembedded-c, bitwise-operationshard