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#include "project.h"
static volatile uint32_t delay_ms_count;
volatile uint32_t ticks;
static volatile int tick_ready;
uint32_t clock_scale = 72;
void
delay_us (uint32_t d)
{
d *= clock_scale;
while (d--)
__asm__ ("nop");
}
void
sys_tick_handler (void)
{
static unsigned slow = 0;
static unsigned medium = 0;
if (delay_ms_count)
delay_ms_count--;
ticks++;
if (!tick_ready)
return;
//buttons_ticker();
//
led_tick();
usart_ticker();
medium++;
if (medium < 1000) return;
medium = 0;
//target_tick();
slow++;
if (slow < 5) return;
slow = 0;
logic_tick();
}
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();
do {
clock_scale--;
v = ticks;
while (v == ticks);
delay_us (1000);
w = ticks;
v++;
w -= v;
} while (w);
tick_ready = 1;
SCS_DEMCR |= SCS_DEMCR_TRCENA;
SCS_DWT_CTRL |= SCS_DWT_CTRL_CYCCNTENA;
}
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