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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@55 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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* Corrected an error in interrupt level context switching
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for C5471
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* Added fgets logic; verified console read.
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* Added fgets() and gets() logic; verified c5471 console read.
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* Corrected error in reading from serial port. Improper
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use of semaphore can cause deadlock.
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* Attempts to use C5471 console from interrupt handlers
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can casue errors. Added a special path for this case.
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* Refuse callse to sem_wait and sem_trywait from interrupt
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handlers.
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* Refuse calls to sem_wait and sem_trywait from interrupt
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handlers. This was happening because interrupt handlers
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were calling printf-like functions.
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* Added strtok() and strtok_r()
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* Added a simple shell called nsh (see examples/nsh).
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* Documentation updates
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