#include "project.h"


static volatile uint32_t delay_ms_count;
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_ms_count)
    delay_ms_count--;

  ticks++;

  led_tick ();

#ifndef SLIM
  lcd_tick ();
#endif
  gpio_tick ();
  usb_tick ();
  ringer_tick ();
  modem_tick ();
  dialstr_tick ();


}


void
delay_ms (uint32_t d)
{
  delay_ms_count = d;
  while (delay_ms_count);
}

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

  if (then > ms)
    return 1;
  return 0;
}


void
ticker_init (void)
{
  uint32_t v, w;

  /*Start periodic timer */

  systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8);
  /* 24MHz / 8 = > 3Mhz */
  systick_set_reload (3000);
  /* 3MHz / 3000 => 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);


}