drashna/qmk_firmware
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Port timer to mbed

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tmk 2014-06-16 11:12:45 +09:00
parent f15b2691c9
commit 867f115bee
6 changed files with 73 additions and 39 deletions
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19
common/timer.h
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@ -20,25 +20,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#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)