Debugging Complex Hardware Software Issues Questions

Proficiency with embedded debugging tools: JTAG debuggers, logic analyzers, oscilloscopes, and software profilers. Techniques for diagnosing hardware faults, timing issues, memory corruption, and mysterious hardware behaviors. Experience reading datasheets and understanding hardware behavior at the register level.

MediumTechnical

26 practiced

Intermittent data corruption occurs when an ISR and main task access a shared structure without obvious synchronization. Propose a step-by-step strategy to reproduce and locate the race: use hardware watchpoints to catch the first corrupting access, add minimal instrumentation (timestamps, atomic counters), temporarily increase logging granularity, and implement fixes (atomic ops, disabling interrupts for short critical sections, or using lock-free ring buffers).

EasyTechnical

21 practiced

Describe the differences between software breakpoints, hardware breakpoints, and watchpoints on embedded microcontrollers. Explain when to use each one, limitations such as available hardware breakpoint/watchpoint count, how they affect flash or RAM, and the impact on timing and real-time behavior when halting the core versus using non-invasive debugging.

EasyTechnical

21 practiced

Given a peripheral register description in a datasheet showing bitfields for CONTROL_REG: bits[0]=ENABLE, bits[3:1]=PRESCALER (0..7), bits[5:4]=MODE (0..3), write a compact C macros/snippet to set ENABLE=1, PRESCALER=8 (if PRESCALER encoded as divide-by-8), and MODE=2 safely. Explain how you would avoid read-modify-write issues if the hardware has RMW errata.

EasyTechnical

31 practiced

Provide a minimal GNU ld linker script for a microcontroller with 256KB of flash starting at 0x08000000 and 64KB of RAM starting at 0x20000000. The script should place the vector table at the beginning of flash, put .text/.rodata in flash, have .data copied to RAM at startup, and reserve .bss in RAM. Show MEMORY and SECTIONS blocks and required symbols used by startup code (e.g., _sdata, _edata, _estack).

HardSystem Design

27 practiced

Propose a robust method for generating and analyzing coredumps on constrained embedded devices after a panic. Include a compact coredump format (options: stripped ELF, custom binary), which registers and memory regions to capture (exception frame, stack, critical global data), how to transfer dumps to host (serial, USB, network), tooling to analyze dumps (gdb with symbol files, custom parsers), and how to map dumps to specific firmware versions reliably.

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