91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// Copyright (C) 2009 Ubixum, Inc.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/*! \file
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* Functions for causing delays.
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* */
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#ifndef DELAY_H
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#define DELAY_H
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#include "fx2types.h"
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/**
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* 0-65536 millis
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**/
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void delay(WORD millis);
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/**
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* See TRM 15-14,15-15
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* some registers (r/w) require syncdelay after
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*
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* up to the programmer to determine which sync is needed.
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* for standard 48mhz clock w/ 48mhz IFCONFIG 3 nops is sufficient.
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*
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* slower clock and faster ifclock require more delay
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*
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* min delay = roof ( 1.5 x (ifclock/clkout + 1) )
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*
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* Minimum IFCLOCK is 5mhz but you have to use an
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* external clock source to go below 30mhz
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*
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* IFCLKSRC 1 = internal, 0=external
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* 3048mhz 0 = 30mhz, 1 = 48mzh
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*
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* Figure your own sync delay out if IFCLKSRC=0.
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**/
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#define NOP __asm nop __endasm
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/**
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* SYNCDELAY2 can work for the following clock speeds
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*
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* ifclk/clk
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* \li 48/12
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*
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* ceil(1.5 * (20.8 / 83.3 + 1)) = 2
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*
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* \see NOP
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*
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**/
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#define SYNCDELAY2 NOP; NOP
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/**
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* SYNCDELAY3 can work for the following clock speeds
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*
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* ifcfg/clk
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* \li 48/24
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* \li 48/48
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* \li 30/12
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* \li 30/24
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*
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* \see NOP
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**/
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#define SYNCDELAY3 NOP; NOP; NOP
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/**
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* SYNCDELAY4 should be used for the following speeds
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*
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* ifcfg/clk
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* \li 30/48
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*
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* \see NOP
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**/
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#define SYNCDELAY4 NOP; NOP; NOP; NOP
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#endif
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