dinu capatina - embedded software bug fixing
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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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