diff options
Diffstat (limited to 'tmk_core/common/avr/timer_avr.h')
| -rw-r--r-- | tmk_core/common/avr/timer_avr.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/tmk_core/common/avr/timer_avr.h b/tmk_core/common/avr/timer_avr.h new file mode 100644 index 0000000000..0e85eb1017 --- /dev/null +++ b/tmk_core/common/avr/timer_avr.h @@ -0,0 +1,42 @@ +/* +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_AVR_H +#define TIMER_AVR_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 + +#endif |