From 04fe78ee0a7fe9baed39f021799a3dbb24ebeb36 Mon Sep 17 00:00:00 2001 From: tmk Date: Mon, 16 Jun 2014 15:38:39 +0900 Subject: Fix print and timer --- common/avr/timer_avr.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 common/avr/timer_avr.h (limited to 'common/avr/timer_avr.h') diff --git a/common/avr/timer_avr.h b/common/avr/timer_avr.h new file mode 100644 index 0000000000..0e85eb1017 --- /dev/null +++ b/common/avr/timer_avr.h @@ -0,0 +1,42 @@ +/* +Copyright 2011 Jun Wako + +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 . +*/ + +#ifndef TIMER_AVR_H +#define TIMER_AVR_H 1 + +#include + +#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 -- cgit v1.2.1