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#include "project.h"
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)
{
ticks++;
cdcacm_tick();
hands_tick();
motor_tick();
led_tick();
}
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);
}
void delay_ms (uint32_t d)
{
uint32_t v = ticks;
while ((ticks - v) < d);
}
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