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/>.
19 #include <avr/interrupt.h>
20 #include <util/atomic.h>
22 #include "timer_avr.h"
26 // counter resolution 1ms
27 // NOTE: union { uint32_t timer32; struct { uint16_t dummy; uint16_t timer16; }}
28 volatile uint32_t timer_count;
35 #if TIMER_PRESCALER == 1
37 #elif TIMER_PRESCALER == 8
39 #elif TIMER_PRESCALER == 64
41 #elif TIMER_PRESCALER == 256
43 #elif TIMER_PRESCALER == 1024
46 # error "Timer prescaler value is NOT vaild."
49 OCR0A = TIMER_RAW_TOP;
54 void timer_clear(void)
56 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
62 uint16_t timer_read(void)
66 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
74 uint32_t timer_read32(void)
78 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
86 uint16_t timer_elapsed(uint16_t last)
90 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
94 return TIMER_DIFF_16((t & 0xFFFF), last);
98 uint32_t timer_elapsed32(uint32_t last)
102 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
106 return TIMER_DIFF_32(t, last);
109 // excecuted once per 1ms.(excess for just timer count?)
110 ISR(TIMER0_COMPA_vect)