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Added item about epicsEndian.h.

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Andrew Johnson
2008-08-27 19:37:23 +00:00
parent 632da18b33
commit 0a393c6553
1 changed files with 13 additions and 0 deletions
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documentation/RELEASE_NOTES.html
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@@ -12,6 +12,19 @@
<h2 align="center">Changes between 3.14.9 and 3.14.10</h2>
<!-- Insert new items below here ... -->
<h4>New epicsEndian.h header</h4>
<p>Any C or C++ code can <tt>#include "epicsEndian.h"</tt> which defines four
macros. The main one is EPICS_BYTE_ORDER and is defined to be either
EPICS_ENDIAN_LITTLE or EPICS_ENDIAN_BIG (these are numeric constants 1234 and
4321 respectively). The fourth macro is called EPICS_FLOAT_WORD_ORDER and is
needed because some ARM systems use mixed-endian format floats.</p>
<p>Note that just knowing the CPU's endianness doesn't tell you the complete
story about the byte order that your hardware registers will present to the CPU;
byte swapping is often performed automatically by PCI to VME bridge devices and
by other kinds of bus converter, so "portable" drivers aren't always.</p>
<h4>Array Subroutine Record added (aSub)</h4>
<p>A heavily modified version of Andy Foster's genSub record type has been