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#include "project.h"
static uint32_t high_tick;
#define QUARTER (1UL << 29)
#define HALF (1UL << 30)
#define THREE_QUARTERS (HALF+QUARTER)
#define ONE (~(uint32_t)0)
uint64_t abs_extend (uint32_t now)
{
static int m;
uint64_t ret;
if (!m) {
ret = high_tick;
ret <<= 32;
ret |= now;
if ((now>THREE_QUARTERS) &&( now<=ONE)) {
high_tick++;
m=1;
}
} else {
if (now<HALF) {
ret = high_tick;
ret <<= 32;
ret |= now;
} else {
ret = high_tick-1;
ret <<= 32;
ret |= now;
}
if ((now>QUARTER) &&( now<HALF))
m=0;
}
return ret;
}
void abs_meh(void)
{
printf("HT %d\n",(int) high_tick);
}
uint64_t abs_get (void)
{
uint32_t now = SCS_DWT_CYCCNT;
return abs_extend (now);
}
void abs_slow_tick()
{
abs_get();
}
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