From 2728603fe6d73e805a539d337fd01051c46ca806 Mon Sep 17 00:00:00 2001 From: Joel Challis Date: Fri, 19 Nov 2021 18:41:02 +0000 Subject: Move tmk_core/common/ (#13918) --- platforms/timer.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 platforms/timer.h (limited to 'platforms/timer.h') diff --git a/platforms/timer.h b/platforms/timer.h new file mode 100644 index 0000000000..02e39e79e7 --- /dev/null +++ b/platforms/timer.h @@ -0,0 +1,67 @@ +/* +Copyright 2011 Jun Wako +Copyright 2021 Simon Arlott + +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 . +*/ + +#pragma once + +#if __has_include_next("_timer.h") +# include_next "_timer.h" /* Include the platform's _timer.h */ +#endif + +#include + +#define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a) - (b))) : ((max == UINT16_MAX) ? ((uint16_t)((a) - (b))) : ((max == UINT32_MAX) ? ((uint32_t)((a) - (b))) : ((a) >= (b) ? (a) - (b) : (max) + 1 - (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); + +// Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value) +#define timer_expired(current, future) ((uint16_t)(current - future) < UINT16_MAX / 2) +#define timer_expired32(current, future) ((uint32_t)(current - future) < UINT32_MAX / 2) + +// Use an appropriate timer integer size based on architecture (16-bit will overflow sooner) +#if FAST_TIMER_T_SIZE < 32 +# define TIMER_DIFF_FAST(a, b) TIMER_DIFF_16(a, b) +# define timer_expired_fast(current, future) timer_expired(current, future) +typedef uint16_t fast_timer_t; +fast_timer_t inline timer_read_fast(void) { return timer_read(); } +fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed(last); } +#else +# define TIMER_DIFF_FAST(a, b) TIMER_DIFF_32(a, b) +# define timer_expired_fast(current, future) timer_expired32(current, future) +typedef uint32_t fast_timer_t; +fast_timer_t inline timer_read_fast(void) { return timer_read32(); } +fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed32(last); } +#endif + +#ifdef __cplusplus +} +#endif -- cgit v1.2.3