#include "project.h"


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

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

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


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


  led_tick();
  oled1_ticker();
  oled2_ticker();
  gauge_ticker();

  ticks++;
}


void
delay_ms (uint32_t d)
{
  delay_ms_count = d;

  while (delay_ms_count);
}


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 (9000);
  /* 9MHz / 9000 => 1kHz */
  systick_interrupt_enable();
  systick_counter_enable();

  /*Calibrate the delay loop */


  do {
    scale--;
    v = ticks;

    while (v == ticks);

    delay_us (1000);
    w = ticks;
    v++;
    w -= v;
  } while (w);


}