mirror of https://gerrit.osmocom.org/libusrp
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* -*- 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.
|
|
*/
|
|
|
|
#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
|
|
}
|