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Chapter 2
CPU_A.ASM contains the assembly language functions to implement code to disable and
enable CPU interrupts, count leading zeros (if the CPU supports that instruction), and
other CPU specific functions that can only be written in assembly language. This file
may also contain code to enable caches, setup MPUs and MMU, and more. The
functions provided in this file are accessible from C.
CPU_C.C contains C code of functions that are based on a specific CPU architecture but
written in C for portability. As a general rule, if a function can be written in C then it
should be, unless there is significant performance benefits available by writing it in
assembly language.
2-7 μC/LIB, PORTABLE LIBRARY FUNCTIONS
μC/LIB consists of library functions meant to be highly portable and not tied to any specific
compiler. This facilitates third-party certification of Micriμm products. μC/OS-III does not
use any μC/LIB functions, however the μC/CPU assumes the presence of LIB_DEF.H for
such definitions as: DEF_YES , DEF_NO , DEF_TRUE , DEF_FALSE , DEF_ON , DEF_OFF and more.
\Micrium
\Software
\uC-LIB
\LIB_ASCII.C
\LIB_ASCII.H
\LIB_DEF.H
\LIB_MATH.C
\LIB_MATH.H
\LIB_MEM.C
\LIB_MEM.H
\LIB_STR.C
\LIB_STR.H
\Cfg\Template
\LIB_CFG.H
\Ports
\<architecture>
\<compiler>
\LIB_MEM_A.ASM
46
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