Steve Karg
4576e41ec3
* Refactored ports/xplained to use common DLMSTP module to enable extended frames * Added floating point compares in cases where they don't exist in math library
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/**
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* @file
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* @brief 1ms timer configuration
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* @author Steve Karg <skarg@users.sourceforge.net>
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* @date 2013
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* @copyright SPDX-License-Identifier: MIT
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "tc.h"
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#include "bacnet/basic/sys/mstimer.h"
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/* define which timer for the counter we are using */
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#define MS_TIMER_COUNTER TCE0
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/* define which timer for the callback we are using */
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#define MS_TIMER_CALLBACK TCE1
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/* counter for the base timer */
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static volatile uint32_t Millisecond_Counter;
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/**
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* Handles an interrupt from a hardware counter timer, every millisecond
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*/
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static void mstimer_counter_handler(void)
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{
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Millisecond_Counter++;
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}
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/**
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* Handles an interrupt from an overflow hardware timer, every millisecond
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*/
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static void mstimer_overflow_handler(void)
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{
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/* callback might go too long; prevent re-entrency by disable IRQ source */
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tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_OFF);
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mstimer_callback_handler();
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tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_LO);
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}
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/**
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* Returns the continuous milliseconds count, which rolls over
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*
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* @return the current milliseconds count
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*/
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unsigned long mstimer_now(void)
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{
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uint32_t timer_value; /* return value */
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tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_OFF);
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timer_value = Millisecond_Counter;
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tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_LO);
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return timer_value;
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}
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/**
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* Timer setup for 1 millisecond timer
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*/
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void mstimer_init(void)
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{
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unsigned long period;
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tc_enable(&MS_TIMER_COUNTER);
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tc_set_overflow_interrupt_callback(&MS_TIMER_COUNTER,
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mstimer_counter_handler);
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tc_set_wgm(&MS_TIMER_COUNTER, TC_WG_NORMAL);
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tc_write_count(&MS_TIMER_COUNTER, 1);
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period = sysclk_get_peripheral_bus_hz(&MS_TIMER_COUNTER);
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period /= 1000;
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tc_write_period(&MS_TIMER_COUNTER, period);
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tc_set_overflow_interrupt_level(&MS_TIMER_COUNTER, TC_INT_LVL_LO);
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tc_write_clock_source(&MS_TIMER_COUNTER, TC_CLKSEL_DIV1_gc);
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tc_enable(&MS_TIMER_CALLBACK);
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tc_set_overflow_interrupt_callback(&MS_TIMER_CALLBACK,
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mstimer_overflow_handler);
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tc_set_wgm(&MS_TIMER_CALLBACK, TC_WG_NORMAL);
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tc_write_count(&MS_TIMER_CALLBACK, 1);
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period = sysclk_get_peripheral_bus_hz(&MS_TIMER_CALLBACK);
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period /= 1000;
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tc_write_period(&MS_TIMER_CALLBACK, period);
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tc_set_overflow_interrupt_level(&MS_TIMER_CALLBACK, TC_INT_LVL_LO);
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tc_write_clock_source(&MS_TIMER_CALLBACK, TC_CLKSEL_DIV1_gc);
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}
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