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https://opencores.org/ocsvn/gecko3/gecko3/trunk
Subversion Repositories gecko3
[/] [gecko3/] [trunk/] [GECKO3COM/] [gecko3com-fw/] [firmware/] [lib/] [timer.c] - Rev 19
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/* -*- c++ -*- */ /* * Copyright 2003 Free Software Foundation, Inc. * * This file is part of GNU Radio * * GNU Radio is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3, or (at your option) * any later version. * * GNU Radio is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GNU Radio; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, * Boston, MA 02110-1301, USA. */ /************************************************************************/ /** \file timer.c ************************************************************************/ #include "timer.h" #include "fx2regs.h" #include "isr.h" /** * Arrange to have isr_tick_handler called at 100 Hz. * * The cpu clock is running at 48e6. The input to the timer * is 48e6 / 12 = 4e6. * * We arrange to have the timer overflow every 40000 clocks == 100 Hz */ #define RELOAD_VALUE ((unsigned short) -40000) void hook_timer_tick (unsigned short isr_tick_handler) { ET2 = 0; /* disable timer 2 interrupts */ hook_sv (SV_TIMER_2, isr_tick_handler); RCAP2H = RELOAD_VALUE >> 8; /* setup the auto reload value */ RCAP2L = RELOAD_VALUE; T2CON = 0x04; /* interrupt on overflow; reload; run */ ET2 = 1; /* enable timer 2 interrupts */ }
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