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[/] [gecko3/] [trunk/] [GECKO3COM/] [gecko3com-fw/] [firmware/] [lib/] [timer.c] - Blame information for rev 18

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Line No. Rev Author Line
1 9 nussgipfel
/* -*- c++ -*- */
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/*
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 * Copyright 2003 Free Software Foundation, Inc.
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 *
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 * This file is part of GNU Radio
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 *
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 * GNU Radio is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 3, or (at your option)
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 * any later version.
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 *
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 * GNU Radio 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
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with GNU Radio; see the file COPYING.  If not, write to
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 * the Free Software Foundation, Inc., 51 Franklin Street,
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 * Boston, MA 02110-1301, USA.
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 */
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/************************************************************************/
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/** \file         timer.c
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 ************************************************************************/
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#include "timer.h"
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#include "fx2regs.h"
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#include "isr.h"
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/**
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 * Arrange to have isr_tick_handler called at 100 Hz.
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 *
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 * The cpu clock is running at 48e6.  The input to the timer
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 * is 48e6 / 12 = 4e6.
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 *
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 * We arrange to have the timer overflow every 40000 clocks == 100 Hz
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 */
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#define RELOAD_VALUE    ((unsigned short) -40000)
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void
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hook_timer_tick (unsigned short isr_tick_handler)
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{
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  ET2 = 0;                       /* disable timer 2 interrupts */
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  hook_sv (SV_TIMER_2, isr_tick_handler);
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  RCAP2H = RELOAD_VALUE >> 8;   /* setup the auto reload value */
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  RCAP2L = RELOAD_VALUE;
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  T2CON = 0x04;                 /* interrupt on overflow; reload; run */
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  ET2 = 1;                      /* enable timer 2 interrupts */
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}

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