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Software for White Rabbit PTP Core
Commit 29b5155a authored by Alessandro Rubini's avatar Alessandro Rubini
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softpll_ng: fix division, using __div64_32 

Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 5a09064d
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Showing with 9 additions and 2 deletions
softpll/softpll_ng.c
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......@@ -670,14 +670,21 @@ static int calc_apr(int meas_min, int meas_max, int f_center )
int64_t delta_low = meas_min - f_center;
int64_t delta_hi = meas_max - f_center;
int ppm_lo, ppm_hi;
if(delta_low >= 0)
return -1;
if(delta_hi <= 0)
return -1;
int ppm_lo = -(int64_t)delta_low * 1000000LL / f_center;
int ppm_hi = (int64_t)delta_hi * 1000000LL / f_center;
/* __div64_32 divides 64 by 32; result is in the 64 argument. */
delta_low = -(int64_t)delta_low * 1000000LL;
__div64_32(&delta_low, f_center);
ppm_lo = delta_low;
delta_hi = delta_hi * 1000000LL;
__div64_32(&delta_hi, f_center);
ppm_hi = delta_hi;
return ppm_lo < ppm_hi ? ppm_lo : ppm_hi;
}
......
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