common/mbed/timer.c

   1 #include "cmsis.h"
   2 #include "timer.h"
   3
   4 /* Mill second tick count */
   5 volatile uint32_t timer_count = 0;
   6
   7 /* Timer interrupt handler */
   8 void SysTick_Handler(void)  {
   9     timer_count++;
  10 }
  11
  12 void timer_init(void)
  13 {
  14     SysTick_Config(SystemCoreClock / 1000); /* 1ms tick */
  15 }
  16
  17 void timer_clear(void)
  18 {
  19     timer_count = 0;
  20 }
  21
  22 uint16_t timer_read(void)
  23 {
  24     return (uint16_t)(timer_count & 0xFFFF);
  25 }
  26
  27 uint32_t timer_read32(void)
  28 {
  29     return timer_count;
  30 }
  31
  32 uint16_t timer_elapsed(uint16_t last)
  33 {
  34     return TIMER_DIFF_16(timer_read(), last);
  35 }
  36
  37 uint32_t timer_elapsed32(uint32_t last)
  38 {
  39     return TIMER_DIFF_32(timer_read32(), last);
  40 }