#include "project.h"


static volatile uint32_t ticks;
static uint32_t scale = 7;

unsigned led1 = 1000, led2 = 1000;



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

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

void
sys_tick_handler (void)
{
  ticks++;
  cdcacm_tick();

  if (led1)
    led1--;

  if (led2)
    led2--;

  if (led1)
    gpio_clear (LED1_BANK, LED1_GPIO);

  else
    gpio_set (LED1_BANK, LED1_GPIO);

  if (led2)
    gpio_clear (LED2_BANK, LED2_GPIO);

  else
    gpio_set (LED2_BANK, LED2_GPIO);
}


void
ticker_init (void)
{
  uint32_t v, w;
  /*Start periodic timer */
  systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8);
  /* 48MHz / 8 = > 6Mhz */
  systick_set_reload (6000);
  /* 6MHz / 6000 => 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);
}