Steve Karg
0001f85f29
* fix ports/xplained build under Linux * fix network port object link-speeds property --------- Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/*
|
|
* @file
|
|
*
|
|
* @brief 1ms timer configuration
|
|
*
|
|
* Copyright (C) 2009 Steve Karg <skarg@users.sourceforge.net>
|
|
*
|
|
* Created: 10/24/2013 8:58:56 PM
|
|
* Author: Steve
|
|
*
|
|
* @page License
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include "tc.h"
|
|
#include "bacnet/basic/sys/mstimer.h"
|
|
|
|
/* define which timer for the counter we are using */
|
|
#define MS_TIMER_COUNTER TCE0
|
|
/* define which timer for the callback we are using */
|
|
#define MS_TIMER_CALLBACK TCE1
|
|
|
|
/* counter for the base timer */
|
|
static volatile uint32_t Millisecond_Counter;
|
|
|
|
/**
|
|
* Handles an interrupt from a hardware counter timer, every millisecond
|
|
*/
|
|
static void mstimer_counter_handler(void)
|
|
{
|
|
Millisecond_Counter++;
|
|
}
|
|
|
|
/**
|
|
* Handles an interrupt from an overflow hardware timer, every millisecond
|
|
*/
|
|
static void mstimer_overflow_handler(void)
|
|
{
|
|
/* callback might go too long; prevent re-entrency by disable IRQ source */
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_OFF);
|
|
mstimer_callback_handler();
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_LO);
|
|
}
|
|
|
|
/**
|
|
* Returns the continuous milliseconds count, which rolls over
|
|
*
|
|
* @return the current milliseconds count
|
|
*/
|
|
unsigned long mstimer_now(void)
|
|
{
|
|
uint32_t timer_value; /* return value */
|
|
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_OFF);
|
|
timer_value = Millisecond_Counter;
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_LO);
|
|
|
|
return timer_value;
|
|
}
|
|
|
|
/**
|
|
* Timer setup for 1 millisecond timer
|
|
*/
|
|
void mstimer_init(void)
|
|
{
|
|
unsigned long period;
|
|
|
|
tc_enable(&MS_TIMER_COUNTER);
|
|
tc_set_overflow_interrupt_callback(&MS_TIMER_COUNTER,
|
|
mstimer_counter_handler);
|
|
tc_set_wgm(&MS_TIMER_COUNTER, TC_WG_NORMAL);
|
|
tc_write_count(&MS_TIMER_COUNTER, 1);
|
|
period = sysclk_get_peripheral_bus_hz(&MS_TIMER_COUNTER);
|
|
period /= 1000;
|
|
tc_write_period(&MS_TIMER_COUNTER, period);
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_LO);
|
|
tc_write_clock_source(&MS_TIMER_COUNTER, TC_CLKSEL_DIV1_gc);
|
|
|
|
tc_enable(&MS_TIMER_CALLBACK);
|
|
tc_set_overflow_interrupt_callback(&MS_TIMER_CALLBACK,
|
|
mstimer_overflow_handler);
|
|
tc_set_wgm(&MS_TIMER_CALLBACK, TC_WG_NORMAL);
|
|
tc_write_count(&MS_TIMER_CALLBACK, 1);
|
|
period = sysclk_get_peripheral_bus_hz(&MS_TIMER_CALLBACK);
|
|
period /= 1000;
|
|
tc_write_period(&MS_TIMER_CALLBACK, period);
|
|
tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_LO);
|
|
tc_write_clock_source(&MS_TIMER_CALLBACK, TC_CLKSEL_DIV1_gc);
|
|
}
|