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3608c106 UH |
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 | |
040a6eae | 14 | // License along with this library; if not, see <http://www.gnu.org/licenses/>. |
3608c106 UH |
15 | |
16 | /*! \file | |
17 | * Functions for causing delays. | |
18 | * */ | |
19 | ||
20 | ||
21 | #ifndef DELAY_H | |
22 | #define DELAY_H | |
23 | ||
24 | #include "fx2types.h" | |
25 | ||
26 | /** | |
27 | * 0-65536 millis | |
28 | **/ | |
29 | void delay(WORD millis); | |
30 | ||
31 | /** | |
32 | * See TRM 15-14,15-15 | |
33 | * some registers (r/w) require syncdelay after | |
34 | * | |
35 | * up to the programmer to determine which sync is needed. | |
36 | * for standard 48mhz clock w/ 48mhz IFCONFIG 3 nops is sufficient. | |
37 | * | |
38 | * slower clock and faster ifclock require more delay | |
39 | * | |
40 | * min delay = roof ( 1.5 x (ifclock/clkout + 1) ) | |
41 | * | |
42 | * Minimum IFCLOCK is 5mhz but you have to use an | |
43 | * external clock source to go below 30mhz | |
44 | * | |
45 | * IFCLKSRC 1 = internal, 0=external | |
46 | * 3048mhz 0 = 30mhz, 1 = 48mzh | |
47 | * | |
48 | * Figure your own sync delay out if IFCLKSRC=0. | |
49 | **/ | |
50 | ||
51 | #define NOP __asm nop __endasm | |
52 | ||
53 | /** | |
54 | * SYNCDELAY2 can work for the following clock speeds | |
55 | * | |
56 | * ifclk/clk | |
57 | * \li 48/12 | |
58 | * | |
59 | * ceil(1.5 * (20.8 / 83.3 + 1)) = 2 | |
60 | * | |
61 | * \see NOP | |
62 | * | |
63 | **/ | |
64 | #define SYNCDELAY2 NOP; NOP | |
65 | ||
66 | /** | |
67 | * SYNCDELAY3 can work for the following clock speeds | |
68 | * | |
69 | * ifcfg/clk | |
70 | * \li 48/24 | |
71 | * \li 48/48 | |
72 | * \li 30/12 | |
73 | * \li 30/24 | |
74 | * | |
75 | * \see NOP | |
76 | **/ | |
77 | #define SYNCDELAY3 NOP; NOP; NOP | |
78 | ||
79 | /** | |
80 | * SYNCDELAY4 should be used for the following speeds | |
81 | * | |
82 | * ifcfg/clk | |
83 | * \li 30/48 | |
84 | * | |
85 | * \see NOP | |
86 | **/ | |
87 | #define SYNCDELAY4 NOP; NOP; NOP; NOP | |
88 | ||
89 | #endif | |
90 |