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#include "project.h"
static volatile uint32_t delay_hms_count;
static 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_hms_count)
delay_hms_count--;
led_tick();
ot_phy_tx_tick();
ot_tick();
onewire_tick();
temp_tick();
adc_tick();
pressure_tick();
ticks++;
}
void
delay_ms (uint32_t d)
{
delay_hms_count = d << 1;
while (delay_hms_count);
}
#if 0
int
timed_out (uint32_t then, unsigned int ms)
{
then = ticks - then;
if (then > ms)
return 1;
return 0;
}
int
timed_out_cycles (uint32_t then, unsigned int cycles)
{
then = dwt_read_cycle_counter() - then;
if (then > cycles)
return 1;
return 0;
}
#endif
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 (4500);
/* 9MHz / 4500 => 2kHz */
systick_interrupt_enable();
systick_counter_enable();
/*Calibrate the delay loop */
do {
scale--;
v = ticks;
while (v == ticks);
delay_us (500);
w = ticks;
v++;
w -= v;
} while (w);
}
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