os_core.txt

在ATmega16芯片上移植的ucosii系统

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Out-of-memory error when compiling OS_CORE.C

On some systems with some combinations of DMAKE and either COMMAND.COM or
CMD.EXE as a command interpreter an out-of-memory error will occur when
compiling OS_CORE.C.

The compiler appears to choke on the definition of the OSUnMapTbl[] array near
the start of the file.  Apparently the compiler doesn't like initializing
an array of this size (256 elements).  To fix the problem break the definition
into two separate arrays and then initialize OSUnMapTbl[] in OSInit().

Here are step-by-step instructions for working around this problem if you
have it.

1) Copy UCOS_II.H from the SOURCE directory to the PORT directory.

    > cd \micrium\software\ucos-ii\ports\80x86\dos\l\pacc751\amr
    > copy \micrium\software\ucos-ii\source\ucos_ii.h .

   Edit UCOS_II.H and change the following line (line 540):

    extern  INT8U  const OSUnMapTbl[256];

   to

    extern  INT8U  OSUnMapTbl[256];
   
2) Copy OS_CORE.C from the SOURCE directory to the PORT directory.

    > copy \micrium\software\ucos-ii\source\os_core.c .

   Edit OS_CORE.C and replace the 18 lines that initialize the
   OSUnMapTbl[] array (near the top of the file) with the following
   single line:

    INT8U  OSUnMapTbl[256];

   Then add the following lines to the beginning of the OSInit
   routine (which can also be found near the beginning of the file):

    int i;
    INT8U  OSUnMapTbl1[] = {
    0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 
    };

    INT8U  OSUnMapTbl2[] = {
    7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
    4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 
    };

    for(i=0; i<128; i++) {
          OSUnMapTbl[i] = OSUnMapTbl1[i];
          OSUnMapTbl[i+128] = OSUnMapTbl2[i];
    }