2 Copyright 2011 Jun Wako <wakojun@gmail.com>
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "avr/timer_avr.h"
28 #define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a)-(b))) : ( \
29 (max == UINT16_MAX) ? ((uint16_t)((a)-(b))) : ( \
30 (max == UINT32_MAX) ? ((uint32_t)((a)-(b))) : ( \
31 (a) >= (b) ? (a) - (b) : (max) + 1 - (b) + (a) ))))
32 #define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
33 #define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)
34 #define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX)
35 #define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b)
42 extern volatile uint32_t timer_count;
45 void timer_init(void);
46 void timer_clear(void);
47 uint16_t timer_read(void);
48 uint32_t timer_read32(void);
49 uint16_t timer_elapsed(uint16_t last);
50 uint32_t timer_elapsed32(uint32_t last);