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#include "project.h"
#define JUMP_THRESH 0.1
#define JUMP_TICKS 30
#define FEEDBACK 0.001
#define WARM_UP 3
static int64_t offset;
static int64_t phase;
int64_t pll_freq = HZ;
static int out_of_lock = JUMP_TICKS + 1;
uint64_t pll_last_update;
int pll_valid = 0;
static int warming_up = WARM_UP;
void pll_meh (void)
{
printf (" %"PRId64" %"PRId64" %" PRId64 "\r\n",
pll_freq, offset, phase);
}
static void modify_pll_freq (uint64_t now, int d)
{
int64_t pd1, pd2, te;
pd1 = now - phase;
te = pd1 / pll_freq;
pd1 %= pll_freq;
if (d > 0)
pll_freq += d;
else
pll_freq -= -d;
pd2 = pd1 + (te * pll_freq);
phase = now - pd2;
}
void pll_dispatch (uint64_t happy, uint64_t edge, const char *src)
{
double f;
int64_t pd;
if (warming_up) {
warming_up--;
return;
}
#if 0
{
int h1, h2, h3, h4;
EPOCH e;
e = pll_decompose (happy);
h1 = e.s;
e = pll_decompose (gps_last_happy);
h2 = e.s;
e = pll_decompose (dcf77_last_happy);
h3 = e.s;
e = pll_decompose (msf_last_happy);
h4 = e.s;
printf ("H %d %d %d %d\r\n", h1 - h2, h2 - h2, h3 - h2, h4 - h2);
}
#endif
if (happy < gps_last_happy) return;
if (happy < dcf77_last_happy) return;
if (happy < msf_last_happy) return;
{
int diff, hf;
pd = edge - phase;
pd %= pll_freq;
hf = (int) (pll_freq >> 1);
diff = (int) pd;
if (diff > hf)
diff = diff - (int) pll_freq;
f = (double) diff;
f /= (double) pll_freq;
}
if ((f > (JUMP_THRESH)) || (f < - (JUMP_THRESH)))
out_of_lock++;
else if (out_of_lock <= JUMP_TICKS)
out_of_lock = 0;
printf ("PLL pd %.3f pll_freq %d phase %d %s\r\n", (float) f, (int) pll_freq, (int) phase, src);
if (out_of_lock > JUMP_TICKS) {
phase += pd;
out_of_lock = 0;
printf ("PLL - jumping\r\n");
pll_freq = HZ;
} else {
f *= FEEDBACK;
f *= (double) pll_freq;
modify_pll_freq (edge, (int) f);
}
pll_last_update = edge;
}
void pll_set_offset (EPOCH epoch, uint64_t abs)
{
int64_t new_offset;
int diff;
/* Find nearest second to abs*/
abs += pll_freq >> 2;
abs -= phase;
abs /= pll_freq;
new_offset = epoch.s - abs;
if (new_offset != offset) {
diff = (int) (new_offset - offset);
printf ("PLL wallclock offset moved by %d\r\n", diff);
offset = new_offset;
}
pll_valid = 1;
time_known = 1;
}
EPOCH _pll_decompose (uint64_t abs)
{
EPOCH ret;
ret.s = abs / pll_freq;
abs -= pll_freq * ret.s;
ret.s += offset;
abs *= (uint64_t) 1000000000;
abs = abs / pll_freq;
ret.ns = abs;
return ret;
}
EPOCH pll_decompose_diff (int64_t diff)
{
EPOCH ret;
if (diff >= 0)
return _pll_decompose (diff);
ret = _pll_decompose (-diff);
ret.s = -ret.s;
ret.ns = -ret.ns;
return ret;
}
EPOCH pll_decompose (uint64_t abs)
{
abs -= phase;
return _pll_decompose (abs);
}
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