2409c28f21
Instead use a private KERNEL_TIMER_FREQ define which is dependant on HAVE_SCROLLWHEEL Comment that call_tick_tasks() will read the scrollwheel Remove the unneeded volatile type qualifier from poll_scrollwheel git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21187 a1c6a512-1295-4272-9138-f99709370657
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright © 2008 Rafaël Carré
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "panic.h"
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#include "timer-target.h"
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#ifdef HAVE_SCROLLWHEEL
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/* let the timer interrupt twice as often for the scrollwheel polling */
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#define KERNEL_TIMER_FREQ (TIMER_FREQ/2)
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#else
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#define KERNEL_TIMER_FREQ TIMER_FREQ
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#endif
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#ifdef HAVE_SCROLLWHEEL
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#include "button-target.h"
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/* The scrollwheel is polled every 5 ms (the tick tasks only every 10) */
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static int poll_scrollwheel = 0;
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void INT_TIMER2(void)
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{
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if (!poll_scrollwheel)
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call_tick_tasks(); /* Run through the list of tick tasks
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* (that includes reading the scrollwheel) */
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else
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{
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if (!button_hold())
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button_read_dbop(); /* Read the scrollwheel */
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}
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poll_scrollwheel ^= 1;
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TIMER2_INTCLR = 0; /* clear interrupt */
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}
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#else
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void INT_TIMER2(void)
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{
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call_tick_tasks(); /* Run through the list of tick tasks */
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TIMER2_INTCLR = 0; /* clear interrupt */
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}
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#endif
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void tick_start(unsigned int interval_in_ms)
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{
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int phi = 0; /* prescaler bits */
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int prescale = 1;
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int cycles = KERNEL_TIMER_FREQ / 1000 * interval_in_ms;
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while(cycles > 0x10000)
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{
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phi++;
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prescale <<= 4;
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cycles >>= 4;
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}
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if(prescale > 256)
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panicf("%s : interval too big", __func__);
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CGU_PERI |= CGU_TIMER2_CLOCK_ENABLE; /* enable peripheral */
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VIC_INT_ENABLE |= INTERRUPT_TIMER2; /* enable interrupt */
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TIMER2_LOAD = TIMER2_BGLOAD = cycles; /* timer period */
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/* /!\ bit 4 (reserved) must not be modified
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* periodic mode, interrupt enabled, 16 bits counter */
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TIMER2_CONTROL = (TIMER2_CONTROL & (1<<4)) | 0xe0 | (phi<<2);
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}
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