86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
|
/***************************************************************************
|
||
|
|
* __________ __ ___.
|
||
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
||
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
||
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
||
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
||
|
|
* \/ \/ \/ \/ \/
|
||
|
|
* $Id$
|
||
|
|
*
|
||
|
|
* Copyright (C) 2021 Aidan MacDonald
|
||
|
|
*
|
||
|
|
* 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 "timer.h"
|
||
|
|
#include "x1000/tcu.h"
|
||
|
|
|
||
|
|
#define TIMER_CHN 5
|
||
|
|
|
||
|
|
bool timer_set(long cycles, bool start)
|
||
|
|
{
|
||
|
|
if(cycles <= 0)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
/* Calculate timer interval */
|
||
|
|
unsigned long counter = cycles;
|
||
|
|
unsigned prescale = 0;
|
||
|
|
while(counter > 0xffff && prescale < 5) {
|
||
|
|
counter /= 4;
|
||
|
|
prescale += 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Duration too long */
|
||
|
|
if(counter > 0xffff)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
/* Unregister old function */
|
||
|
|
if(start && pfn_unregister) {
|
||
|
|
pfn_unregister();
|
||
|
|
pfn_unregister = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure the timer */
|
||
|
|
jz_clr(TCU_STOP, 1 << TIMER_CHN);
|
||
|
|
jz_clr(TCU_ENABLE, 1 << TIMER_CHN);
|
||
|
|
jz_overwritef(TCU_CTRL(TIMER_CHN), SOURCE_V(EXT), PRESCALE(prescale));
|
||
|
|
jz_write(TCU_CMP_FULL(TIMER_CHN), counter);
|
||
|
|
jz_write(TCU_CMP_HALF(TIMER_CHN), 0);
|
||
|
|
jz_clr(TCU_FLAG, 1 << TIMER_CHN);
|
||
|
|
jz_clr(TCU_MASK, 1 << TIMER_CHN);
|
||
|
|
|
||
|
|
if(start)
|
||
|
|
return timer_start();
|
||
|
|
else
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool timer_start(void)
|
||
|
|
{
|
||
|
|
jz_set(TCU_ENABLE, 1 << TIMER_CHN);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void timer_stop(void)
|
||
|
|
{
|
||
|
|
jz_clr(TCU_ENABLE, 1 << TIMER_CHN);
|
||
|
|
jz_set(TCU_MASK, 1 << TIMER_CHN);
|
||
|
|
jz_clr(TCU_FLAG, 1 << TIMER_CHN);
|
||
|
|
jz_set(TCU_STOP, 1 << TIMER_CHN);
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCU1(void)
|
||
|
|
{
|
||
|
|
jz_clr(TCU_FLAG, 1 << TIMER_CHN);
|
||
|
|
|
||
|
|
if(pfn_timer)
|
||
|
|
pfn_timer();
|
||
|
|
}
|