lunaix-os/hal/timer/hwtimer.c

   1 #include <hal/hwtimer.h>
   2 #include <lunaix/spike.h>
   3
   4 struct hwtimer_context* current_timer;
   5
   6 void
   7 hwtimer_init(u32_t hertz, void* tick_callback)
   8 {
   9     struct hwtimer_context* hwt_ctx = hwtimer_choose();
  10
  11     hwt_ctx->init(hwt_ctx, hertz, tick_callback);
  12     hwt_ctx->running_freq = hertz;
  13
  14     current_timer = hwt_ctx;
  15 }
  16
  17 ticks_t
  18 hwtimer_base_frequency()
  19 {
  20     return current_timer->base_freq;
  21 }
  22
  23 ticks_t
  24 hwtimer_current_systicks()
  25 {
  26     return current_timer->systicks();
  27 }
  28
  29 ticks_t
  30 hwtimer_to_ticks(u32_t value, int unit)
  31 {
  32     // in case system frequency is less than 1000Hz
  33     if (unit != TIME_MS) {
  34         return current_timer->running_freq * unit * value;
  35     }
  36
  37     ticks_t freq_ms = current_timer->running_freq / 1000;
  38
  39     return freq_ms * value;
  40 }