3 * Copyright 2003 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
28 * Arrange to have isr_tick_handler called at 100 Hz.
30 * The cpu clock is running at 48e6. The input to the timer
33 * We arrange to have the timer overflow every 40000 clocks == 100 Hz
36 #define RELOAD_VALUE ((unsigned short) -40000)
39 hook_timer_tick (unsigned short isr_tick_handler)
41 ET2 = 0; // disable timer 2 interrupts
42 hook_sv (SV_TIMER_2, isr_tick_handler);
44 RCAP2H = RELOAD_VALUE >> 8; // setup the auto reload value
45 RCAP2L = RELOAD_VALUE;
47 T2CON = 0x04; // interrupt on overflow; reload; run
48 ET2 = 1; // enable timer 2 interrupts