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#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 ();
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);
}
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