56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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Copyright 2011 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TIMER_H
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#define TIMER_H 1
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#include <stdint.h>
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#include <stdbool.h>
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#if defined(__AVR__)
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# include "avr/timer_avr.h"
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#endif
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#define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a) - (b))) : ((max == UINT16_MAX) ? ((uint16_t)((a) - (b))) : ((max == UINT32_MAX) ? ((uint32_t)((a) - (b))) : ((a) >= (b) ? (a) - (b) : (max) + 1 - (b) + (a)))))
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#define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
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#define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)
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#define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX)
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#define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b)
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern volatile uint32_t timer_count;
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void timer_init(void);
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void timer_clear(void);
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uint16_t timer_read(void);
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uint32_t timer_read32(void);
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uint16_t timer_elapsed(uint16_t last);
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uint32_t timer_elapsed32(uint32_t last);
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// Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value)
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#define timer_expired(current, future) ((uint16_t)(current - future) < UINT16_MAX / 2)
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#define timer_expired32(current, future) ((uint32_t)(current - future) < UINT32_MAX / 2)
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#ifdef __cplusplus
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}
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#endif
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#endif
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