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- /*
- Copyright 2011 Jun Wako <[email protected]>
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef TIMER_H
- #define TIMER_H 1
-
- #include <stdint.h>
-
- #ifndef TIMER_PRESCALER
- # if F_CPU > 16000000
- # define TIMER_PRESCALER 256
- # elif F_CPU > 2000000
- # define TIMER_PRESCALER 64
- # elif F_CPU > 250000
- # define TIMER_PRESCALER 8
- # else
- # define TIMER_PRESCALER 1
- # endif
- #endif
- #define TIMER_RAW_FREQ (F_CPU/TIMER_PRESCALER)
- #define TIMER_RAW TCNT0
- #define TIMER_RAW_TOP (TIMER_RAW_FREQ/1000)
-
- #if (TIMER_RAW_TOP > 255)
- # error "Timer0 can't count 1ms at this clock freq. Use larger prescaler."
- #endif
-
- #define TIMER_DIFF(a, b, max) ((a) >= (b) ? (a) - (b) : (max) - (b) + (a))
- #define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
- #define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)
- #define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX)
- #define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b)
-
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- extern volatile uint32_t timer_count;
-
-
- void timer_init(void);
- void timer_clear(void);
- uint16_t timer_read(void);
- uint32_t timer_read32(void);
- uint16_t timer_elapsed(uint16_t last);
- uint32_t timer_elapsed32(uint32_t last);
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif
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