Embedded Software Bug Fixing

Dinu Capatina

10th of November 2012

Top causes of nasty embedded software bugs

Race condition

Symptoms : radio mode 0h0m0s

First approach

TRON

I-TRON / µITRON

OS Kernel

Japanese open Standard for RTOSHard real-time

Priority basedEvent driven

Ready queue

Timer interrupt wlftime = TCK_DEN*slp

Sleeping taskswlftime = 0x28431f70 ms

Memory map

SYSMT

IRQSTKFFF000CF

…

…

…

TCK_NUM

…

TCK_DEN FFF000C0

SP = FFF000C0

System status

Best practice : 0xDEADBEEF

Questions ?

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