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#include "project.h"
#define JUMP_THRESH 0.1
#define JUMP_TICKS 30
#define FEEDBACK 0.0001
#define WARM_UP 30
static int64_t offset;
static int64_t phase;
int64_t pll_freq = HW_CLOCK_HZ;
static int out_of_lock = JUMP_TICKS + 1;
uint64_t pll_last_update;
int pll_valid = 0;
int pll_ready = 0;
# if 0
#define PLL_BW 0.01
#define PLL_DAMP 0.707
#define PLL_GAIN 0.001
#define F_T1 ((PLL_GAIN)/((PLL_BW)*(PLL_BW)))
#define F_T2 ((2*(PLL_DAMP))/(PLL_BW))
#define F_B0 (((4*(PLL_GAIN))/(F_T1))*(1.0+((F_T2)/(2.0))))
#define F_B1 ((8*(PLL_GAIN))/(F_T1))
#define F_B2 (((4*(PLL_GAIN))/(F_T1))*(1.0-((F_T2)/(2.0))))
#define F_A0 (1.0)
#define F_A1 (-2.0)
#define F_A2 (1.0)
void pll_dump_filter (void)
{
printf ("%g %g %g\n", F_A0, F_A1, F_A2);
printf ("%g %g %g\n", F_B0, F_B1, F_B2);
}
static double filter (double in)
{
static double v[3];
double ret;
v[2] = v[1];
v[1] = v[0];
v[0] = in - (v[1] * F_A1) - (v[2] * F_A2);
return (v[0] * F_B0) + (v[1] * F_B1) + (v[2] * F_B2);
}
#endif
#define PLL_ALPHA (0.005)
#define PLL_BETA (0.5*PLL_ALPHA*PLL_ALPHA)
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 (pd1 > (pll_freq >> 1)) {
te++;
pd1 = pd1 - pll_freq;
}
if (d > 0)
pll_freq += d;
else
pll_freq -= -d;
pd2 = pd1 + (te * pll_freq);
phase = now - pd2;
}
uint64_t make_happy (uint64_t abs, int64_t shift)
{
shift *= HW_CLOCK_HZ;
if (shift < 0) {
shift = -shift;
if (abs < (uint64_t) shift) return 0;
else
return abs - shift;
}
return abs + shift;
}
void pll_dispatch (uint64_t happy, uint64_t edge, const char *src)
{
double f, g;
int64_t pd;
#if 0
{
int h1, h2, h3, h4;
EPOCH e;
UTC u;
char s1[80];
char s2[80];
char s3[80];
char s4[80];
e = pll_decompose (happy);
u = time_epoch_to_utc (e);
utc_to_str (s1, u);
h1 = e.s;
e = pll_decompose (gps_last_happy);
u = time_epoch_to_utc (e);
utc_to_str (s2, u);
h2 = e.s;
e = pll_decompose (dcf77_last_happy);
u = time_epoch_to_utc (e);
utc_to_str (s3, u);
h3 = e.s;
e = pll_decompose (msf_last_happy);
u = time_epoch_to_utc (e);
utc_to_str (s4, u);
h4 = e.s;
printf ("H %d %d %d %d\r\n", h1 - h2, h2 - h2, h3 - h2, h4 - h2);
// printf ("H %s %s %s %s\r\n",s1,s2,s3,s4);
}
#endif
if ((!gps_last_happy) && (!dcf77_last_happy) && (!msf_last_happy)) return;
if (happy < gps_last_happy) return;
if (happy < dcf77_last_happy) return;
if (happy < msf_last_happy) return;
if (!pll_ready && (edge < ((uint64_t) WARM_UP * (uint64_t) HW_CLOCK_HZ)))
return;
led_blink (100);
#if 0
printf ("EDGE %08x%08x\r\n",
(unsigned) (edge >> 32),
(unsigned) (edge & 0xffffffff));
#endif
{
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;
g = f / (double) pll_freq;
}
if ((g > (JUMP_THRESH)) || (g < - (JUMP_THRESH)))
out_of_lock++;
else if (out_of_lock <= JUMP_TICKS)
out_of_lock = 0;
printf ("PLL pd %.3f %.1f pll_freq %d phase %d %s\r\n", (float) g, (float)f, (int) pll_freq, (int) phase, src);
if ((out_of_lock > JUMP_TICKS) || !pll_ready) {
phase += pd;
out_of_lock = 0;
printf ("PLL - jumping\r\n");
pll_freq = HW_CLOCK_HZ;
pll_ready = 1;
} else {
phase += (int) (f * PLL_BETA);
modify_pll_freq (edge, (int) (f * PLL_ALPHA));
}
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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