From 867f115bee190515aa195dc3e58f1c381ea9695b Mon Sep 17 00:00:00 2001 From: tmk Date: Mon, 16 Jun 2014 11:12:45 +0900 Subject: Port timer to mbed --- common/avr/timer.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++ common/mbed/timer.c | 40 ++++++++++++++++++ common/timer.c | 116 --------------------------------------------------- common/timer.h | 19 --------- 4 files changed, 157 insertions(+), 135 deletions(-) create mode 100644 common/avr/timer.c create mode 100644 common/mbed/timer.c delete mode 100644 common/timer.c (limited to 'common') diff --git a/common/avr/timer.c b/common/avr/timer.c new file mode 100644 index 000000000..292b41c3a --- /dev/null +++ b/common/avr/timer.c @@ -0,0 +1,117 @@ +/* +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 . +*/ + +#include +#include +#include +#include "timer_avr.h" +#include "timer.h" + + +// counter resolution 1ms +// NOTE: union { uint32_t timer32; struct { uint16_t dummy; uint16_t timer16; }} +volatile uint32_t timer_count = 0; + +void timer_init(void) +{ + // Timer0 CTC mode + TCCR0A = 0x02; + +#if TIMER_PRESCALER == 1 + TCCR0B = 0x01; +#elif TIMER_PRESCALER == 8 + TCCR0B = 0x02; +#elif TIMER_PRESCALER == 64 + TCCR0B = 0x03; +#elif TIMER_PRESCALER == 256 + TCCR0B = 0x04; +#elif TIMER_PRESCALER == 1024 + TCCR0B = 0x05; +#else +# error "Timer prescaler value is NOT vaild." +#endif + + OCR0A = TIMER_RAW_TOP; + TIMSK0 = (1< - -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 . -*/ - -#include -#include -#include -#include "timer.h" - - -// counter resolution 1ms -// NOTE: union { uint32_t timer32; struct { uint16_t dummy; uint16_t timer16; }} -volatile uint32_t timer_count = 0; - -void timer_init(void) -{ - // Timer0 CTC mode - TCCR0A = 0x02; - -#if TIMER_PRESCALER == 1 - TCCR0B = 0x01; -#elif TIMER_PRESCALER == 8 - TCCR0B = 0x02; -#elif TIMER_PRESCALER == 64 - TCCR0B = 0x03; -#elif TIMER_PRESCALER == 256 - TCCR0B = 0x04; -#elif TIMER_PRESCALER == 1024 - TCCR0B = 0x05; -#else -# error "Timer prescaler value is NOT vaild." -#endif - - OCR0A = TIMER_RAW_TOP; - TIMSK0 = (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 - #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) -- cgit v1.2.3