#include "project.h"


static volatile uint32_t delay_hms_count;
static volatile uint32_t ticks;
static uint32_t scale = 7;

void
delay_us (uint32_t d)
{
  d *= scale;

  while (d--)
    __asm__ ("nop");
}


void
sys_tick_handler (void)
{
  if (delay_hms_count)
    delay_hms_count--;


  led_tick();
  ot_phy_tx_tick();
  ot_tick();
  onewire_tick();
  temp_tick();
  adc_tick();
  pressure_tick();


  ticks++;
}



void
delay_ms (uint32_t d)
{
  delay_hms_count = d << 1;

  while (delay_hms_count);
}

#if 0
int
timed_out (uint32_t then, unsigned int ms)
{
  then = ticks - then;

  if (then > ms)
    return 1;

  return 0;
}

int
timed_out_cycles (uint32_t then, unsigned int cycles)
{
  then = dwt_read_cycle_counter() - then;

  if (then > cycles)
    return 1;

  return 0;
}
#endif



void
ticker_init (void)
{
  uint32_t v, w;

  /*Start periodic timer */

  systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8);
  /* 72MHz / 8 = > 9Mhz */
  systick_set_reload (4500);
  /* 9MHz / 4500 => 2kHz */
  systick_interrupt_enable();
  systick_counter_enable();

  /*Calibrate the delay loop */



  do {
    scale--;
    v = ticks;

    while (v == ticks);

    delay_us (500);
    w = ticks;
    v++;
    w -= v;
  } while (w);



}