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a074364c | 1 | /* |
2 | Copyright 2011 Jun Wako <wakojun@gmail.com> | |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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/>. | |
16 | */ | |
17 | ||
18 | #ifndef TIMER_H | |
19 | #define TIMER_H 1 | |
20 | ||
21 | #include <stdint.h> | |
957070a6 | 22 | #include <stdbool.h> |
a074364c | 23 | |
24 | #if defined(__AVR__) | |
b624f32f | 25 | # include "avr/timer_avr.h" |
a074364c | 26 | #endif |
27 | ||
b624f32f | 28 | #define TIMER_DIFF(a, b, max) ((a) >= (b) ? (a) - (b) : (max) - (b) + (a)) |
29 | #define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX) | |
30 | #define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX) | |
31 | #define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX) | |
32 | #define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b) | |
a074364c | 33 | |
34 | #ifdef __cplusplus | |
35 | extern "C" { | |
36 | #endif | |
37 | ||
38 | extern volatile uint32_t timer_count; | |
39 | ||
b624f32f | 40 | void timer_init(void); |
41 | void timer_clear(void); | |
a074364c | 42 | uint16_t timer_read(void); |
43 | uint32_t timer_read32(void); | |
44 | uint16_t timer_elapsed(uint16_t last); | |
45 | uint32_t timer_elapsed32(uint32_t last); | |
46 | ||
957070a6 | 47 | // Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value) |
26eef35f JY |
48 | #define timer_expired(current, future) (((uint16_t)current - (uint16_t)future) < 0x8000) |
49 | #define timer_expired32(current, future) (((uint32_t)current - (uint32_t)future) < 0x80000000) | |
957070a6 | 50 | |
a074364c | 51 | #ifdef __cplusplus |
52 | } | |
53 | #endif | |
54 | ||
55 | #endif |