/* Copyright 2011 Jun Wako <wakojun@gmail.com> 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