include/delay.h

   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 /**
  91  * All the SYNCDELAYs you could possibly want for other speeds
  92  *
  93  * \see NOP
  94  **/
  95 #define SYNCDELAY5  NOP; NOP; NOP; NOP; NOP
  96 #define SYNCDELAY6  NOP; NOP; NOP; NOP; NOP; NOP
  97 #define SYNCDELAY7  NOP; NOP; NOP; NOP; NOP; NOP; NOP
  98 #define SYNCDELAY8  NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
  99 #define SYNCDELAY9  NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 100 #define SYNCDELAY10 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 101 #define SYNCDELAY11 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 102 #define SYNCDELAY12 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 103 #define SYNCDELAY13 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 104 #define SYNCDELAY14 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 105 #define SYNCDELAY15 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 106 #define SYNCDELAY16 NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP
 107
 108 #endif
 109