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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "system.h"
#include "kernel.h"
#include "jz4740.h"
extern void (*tick_funcs[MAX_NUM_TICK_TASKS])(void);
#define USE_RTC_CLOCK 0
void tick_start(unsigned int interval_in_ms)
{
unsigned int tps = interval_in_ms;
unsigned int latch;
__cpm_start_tcu();
__tcu_stop_counter(0);
__tcu_disable_pwm_output(0);
__tcu_stop_counter(1);
__tcu_disable_pwm_output(1);
__tcu_stop_counter(2);
__tcu_disable_pwm_output(2);
__tcu_clear_full_match_flag(2);
__tcu_mask_half_match_irq(0);
__tcu_unmask_full_match_irq(0);
#if USE_RTC_CLOCK
__tcu_select_rtcclk(0);
__tcu_select_clk_div1(0);
latch = (__cpm_get_rtcclk() + (tps>>1)) / tps;
#else
__tcu_select_extalclk(0);
__tcu_select_clk_div4(0);
latch = (JZ_EXTAL / 4 + (tps>>1)) / tps;
#endif
REG_TCU_TCNT(0) = 0;
REG_TCU_TDFR(0) = latch;
REG_TCU_TDHR(0) = latch;
//REG_TCU_TDHR(0) = 0;
__tcu_clear_full_match_flag(0);
__tcu_start_counter(0);
system_enable_irq(IRQ_TCU0);
}
/* Interrupt handler */
void TCU0(void)
{
__tcu_clear_full_match_flag(0);
int i;
/* Run through the list of tick tasks */
for(i = 0; i < MAX_NUM_TICK_TASKS; i++)
{
if(tick_funcs[i])
tick_funcs[i]();
}
current_tick++;
}
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