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#include "project.h"
static uint32_t high_tick;
#if HW_CLOCK_LEN == 32
#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;
}
#elif HW_CLOCK_LEN == 31
#define QUARTER (1UL << 28)
#define HALF (1UL << 29)
#define THREE_QUARTERS (HALF+QUARTER)
#define ONE (0x7fffffff)
uint64_t abs_extend (uint32_t now)
{
static int m;
uint64_t ret;
if (!m) {
ret = high_tick;
ret <<= 31;
ret |= now;
if ((now > THREE_QUARTERS) && (now <= ONE)) {
high_tick++;
m = 1;
}
} else {
if (now < HALF) {
ret = high_tick;
ret <<= 31;
ret |= now;
} else {
ret = high_tick - 1;
ret <<= 31;
ret |= now;
}
if ((now > QUARTER) && (now < HALF))
m = 0;
}
return ret;
}
#else
#error unknown hardware clock length
#endif
void abs_meh (void)
{
printf ("HT %d\n", (int) high_tick);
}
uint64_t abs_get (void)
{
uint32_t now = HW_CLOCK_REG;
return abs_extend (now);
}
void abs_slow_tick()
{
abs_get();
}
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