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14<h1 align="left">fx16 Type Macros <img src="../image/NTR.gif"align="middle"><img src="../image/TWL.gif" align="middle"></h1>
15<h2>Description</h2>
16<TABLE border="0" width="100%">
17  <TBODY>
18    <TR>
19      <TD width="154">FX16_SHIFT</TD>
20      <TD width="487">Defines the shift number (12) for <code>fx16</code> types.</TD>
21    </TR>
22    <TR>
23      <TD width="154">FX16_INT_SIZE</TD>
24      <TD width="487">Defines the bit width of the integer portion (3) for <CODE>fx16</CODE> types.</TD>
25    </TR>
26    <TR>
27      <TD width="154">FX16_DEC_SIZE</TD>
28      <TD width="487">Defines the bit width for the decimal portion (12) for <CODE>fx16</CODE> types.</TD>
29    </TR>
30    <TR>
31      <TD width="154">FX16_INT_MASK</TD>
32      <TD width="487">Defines the mask (<CODE>0x7000</CODE>) for the integer portion of <CODE>fx16</CODE> types.</TD>
33    </TR>
34    <TR>
35      <TD width="154">FX16_DEC_MASK</TD>
36      <TD width="487">Defines the mask (<CODE>0x0fff</CODE>) for the decimal portion of <CODE>fx16</CODE> types.</TD>
37    </TR>
38    <TR>
39      <TD width="154">FX16_SIGN_MASK</TD>
40      <TD width="487">Defines the mask (<CODE>0x8000</CODE>) for the sign portion of <CODE>fx16</CODE> types.</TD>
41    </TR>
42    <TR>
43      <TD width="154">FX16_MAX</TD>
44      <TD width="487">Defines the maximum value (<CODE>0x7fff</CODE>) that can be obtained with <CODE>fx16</CODE> types.</TD>
45    </TR>
46    <TR>
47      <TD width="154">FX16_MIN</TD>
48      <TD width="487">Defines the minimum value (<CODE>0x8000</CODE>) that can be obtained with <CODE>fx16</CODE> types.</TD>
49    </TR>
50    <TR>
51      <TD>FX_FX16_TO_F32</TD>
52      <TD>Converts an fx16 type to an f32 type.</TD>
53    </TR>
54    <TR>
55      <TD>FX_F32_TO_FX16<BR>
56      FX16_CONST</TD>
57      <TD>Converts an f32 type to an fx16 type.</TD>
58    </TR>
59  </TBODY>
60</TABLE>
61<H2>Macro Definitions</H2>
62<PRE><CODE>#define FX16_SHIFT          12
63#define FX16_INT_SIZE       3
64#define FX16_DEC_SIZE       12
65
66#define FX16_INT_MASK       0x7000
67#define FX16_DEC_MASK       0x0fff
68#define FX16_SIGN_MASK      0x8000
69
70#define FX16_MAX            (fx16)(0x7fff)
71#define FX16_MIN            (fx16)(0x8000)
72#define FX_FX16_TO_F32(x)    ((f32)((x) / (f32)(1 &lt;&lt; FX16_SHIFT)))
73#define FX_F32_TO_FX16(x)    ((fx16)(((x) &gt; 0) ?
74                                     (fx16)((x) * (1 &lt;&lt; FX16_SHIFT) + 0.5f ) :
75                                     (fx16)((x) * (1 &lt;&lt; FX16_SHIFT) - 0.5f )))
76
77#define FX16_CONST(x)       FX_F32_TO_FX16(x)
78
79</CODE></PRE>
80<h2>Revision History</h2>
81<P>2004/02/25 Initial version.</P>
82<hr><p>CONFIDENTIAL</p></body>
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