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qmk_firmware

custom branch of QMK firmware git clone https://anongit.hacktivis.me/git/qmk_firmware.git

timer.h (2510B)

    

  1. /*
  2. Copyright 2011 Jun Wako <wakojun@gmail.com>
  3. Copyright 2021 Simon Arlott
  5. This program is free software: you can redistribute it and/or modify
  6. it under the terms of the GNU General Public License as published by
  7. the Free Software Foundation, either version 2 of the License, or
  8. (at your option) any later version.
  10. This program is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13. GNU General Public License for more details.
  15. You should have received a copy of the GNU General Public License
  16. along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17. */
  19. #pragma once
  21. #if __has_include_next("_timer.h")
  22. #    include_next "_timer.h" /* Include the platform's _timer.h */
  23. #endif
  25. #include <stdint.h>
  27. #define TIMER_DIFF_8(a, b) (uint8_t)((a) - (b))
  28. #define TIMER_DIFF_16(a, b) (uint16_t)((a) - (b))
  29. #define TIMER_DIFF_32(a, b) (uint32_t)((a) - (b))
  30. #define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b)
  32. #ifdef __cplusplus
  33. extern "C" {
  34. #endif
  36. extern volatile uint32_t timer_count;
  38. void     timer_init(void);
  39. void     timer_clear(void);
  40. void     timer_save(void);
  41. void     timer_restore(void);
  42. uint16_t timer_read(void);
  43. uint32_t timer_read32(void);
  44. uint16_t timer_elapsed(uint16_t last);
  45. uint32_t timer_elapsed32(uint32_t last);
  47. // Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value)
  48. #define timer_expired(current, future) ((uint16_t)(current - future) < UINT16_MAX / 2)
  49. #define timer_expired32(current, future) ((uint32_t)(current - future) < UINT32_MAX / 2)
  51. // Use an appropriate timer integer size based on architecture (16-bit will overflow sooner)
  52. #if FAST_TIMER_T_SIZE < 32
  53. #    define TIMER_DIFF_FAST(a, b) TIMER_DIFF_16(a, b)
  54. #    define timer_expired_fast(current, future) timer_expired(current, future)
  55. typedef uint16_t fast_timer_t;
  56. fast_timer_t inline timer_read_fast(void) {
  57.     return timer_read();
  58. }
  59. fast_timer_t inline timer_elapsed_fast(fast_timer_t last) {
  60.     return timer_elapsed(last);
  61. }
  62. #else
  63. #    define TIMER_DIFF_FAST(a, b) TIMER_DIFF_32(a, b)
  64. #    define timer_expired_fast(current, future) timer_expired32(current, future)
  65. typedef uint32_t fast_timer_t;
  66. fast_timer_t inline timer_read_fast(void) {
  67.     return timer_read32();
  68. }
  69. fast_timer_t inline timer_elapsed_fast(fast_timer_t last) {
  70.     return timer_elapsed32(last);
  71. }
  72. #endif
  74. #ifdef __cplusplus
  75. }
  76. #endif