diff options
| -rw-r--r-- | tmk_core/common/chibios/timer.c | 42 |
1 files changed, 28 insertions, 14 deletions
diff --git a/tmk_core/common/chibios/timer.c b/tmk_core/common/chibios/timer.c index 3de4cc368..473e533ca 100644 --- a/tmk_core/common/chibios/timer.c +++ b/tmk_core/common/chibios/timer.c @@ -2,26 +2,40 @@ #include "timer.h" -void timer_init(void) {} +static systime_t last_systime = 0; +static systime_t overflow = 0; +static uint32_t current_time_ms = 0; -void timer_clear(void) {} +void timer_init(void) { + timer_clear(); +} + +void timer_clear(void) { + last_systime = chVTGetSystemTime(); + overflow = 0; + current_time_ms = 0; +} -uint16_t timer_read(void) -{ - return (uint16_t)ST2MS(chVTGetSystemTime()); +uint16_t timer_read(void) { + return (uint16_t)timer_read32(); } -uint32_t timer_read32(void) -{ - return ST2MS(chVTGetSystemTime()); +uint32_t timer_read32(void) { + // Note: We assume that the timer update is called at least once betweeen every wrap around of the system time + systime_t current_systime = chVTGetSystemTime(); + systime_t elapsed = current_systime - last_systime + overflow; + uint32_t elapsed_ms = ST2MS(elapsed); + current_time_ms += elapsed_ms; + overflow = elapsed - MS2ST(elapsed_ms); + last_systime = current_systime; + + return current_time_ms; } -uint16_t timer_elapsed(uint16_t last) -{ - return (uint16_t)(ST2MS(chVTTimeElapsedSinceX(MS2ST(last)))); +uint16_t timer_elapsed(uint16_t last) { + return timer_read() - last; } -uint32_t timer_elapsed32(uint32_t last) -{ - return ST2MS(chVTTimeElapsedSinceX(MS2ST(last))); +uint32_t timer_elapsed32(uint32_t last) { + return timer_read32() - last; } |