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1 | // Copyright (C) 2009 Ubixum, Inc. |
2 | // | |
3 | // This library is free software; you can redistribute it and/or | |
4 | // modify it under the terms of the GNU Lesser General Public | |
5 | // License as published by the Free Software Foundation; either | |
6 | // version 2.1 of the License, or (at your option) any later version. | |
7 | // | |
8 | // This library is distributed in the hope that it will be useful, | |
9 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | // Lesser General Public License for more details. | |
12 | // | |
13 | // You should have received a copy of the GNU Lesser General Public | |
14 | // License along with this library; if not, write to the Free Software | |
15 | // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | ||
17 | /*! \file | |
18 | * Functions for causing delays. | |
19 | * */ | |
20 | ||
21 | ||
22 | #ifndef DELAY_H | |
23 | #define DELAY_H | |
24 | ||
25 | #include "fx2types.h" | |
26 | ||
27 | /** | |
28 | * 0-65536 millis | |
29 | **/ | |
30 | void delay(WORD millis); | |
31 | ||
32 | /** | |
33 | * See TRM 15-14,15-15 | |
34 | * some registers (r/w) require syncdelay after | |
35 | * | |
36 | * up to the programmer to determine which sync is needed. | |
37 | * for standard 48mhz clock w/ 48mhz IFCONFIG 3 nops is sufficient. | |
38 | * | |
39 | * slower clock and faster ifclock require more delay | |
40 | * | |
41 | * min delay = roof ( 1.5 x (ifclock/clkout + 1) ) | |
42 | * | |
43 | * Minimum IFCLOCK is 5mhz but you have to use an | |
44 | * external clock source to go below 30mhz | |
45 | * | |
46 | * IFCLKSRC 1 = internal, 0=external | |
47 | * 3048mhz 0 = 30mhz, 1 = 48mzh | |
48 | * | |
49 | * Figure your own sync delay out if IFCLKSRC=0. | |
50 | **/ | |
51 | ||
52 | #define NOP __asm nop __endasm | |
53 | ||
54 | /** | |
55 | * SYNCDELAY2 can work for the following clock speeds | |
56 | * | |
57 | * ifclk/clk | |
58 | * \li 48/12 | |
59 | * | |
60 | * ceil(1.5 * (20.8 / 83.3 + 1)) = 2 | |
61 | * | |
62 | * \see NOP | |
63 | * | |
64 | **/ | |
65 | #define SYNCDELAY2 NOP; NOP | |
66 | ||
67 | /** | |
68 | * SYNCDELAY3 can work for the following clock speeds | |
69 | * | |
70 | * ifcfg/clk | |
71 | * \li 48/24 | |
72 | * \li 48/48 | |
73 | * \li 30/12 | |
74 | * \li 30/24 | |
75 | * | |
76 | * \see NOP | |
77 | **/ | |
78 | #define SYNCDELAY3 NOP; NOP; NOP | |
79 | ||
80 | /** | |
81 | * SYNCDELAY4 should be used for the following speeds | |
82 | * | |
83 | * ifcfg/clk | |
84 | * \li 30/48 | |
85 | * | |
86 | * \see NOP | |
87 | **/ | |
88 | #define SYNCDELAY4 NOP; NOP; NOP; NOP | |
89 | ||
90 | #endif | |
91 |