sm_io/*/sm_ch_si57x.c: fix frequency calculation

RFREQ is a 38-bit number, with the 10 MSB the integer part and the 28 LSB the fractional part. So, we need to divide RFEQ by 2^28 prior to the calculation.

sm_io/*/sm_ch_si57x.c: fix frequency calculation
RFREQ is a 38-bit number, with the 10 MSB the integer part and the 28 LSB the fractional part. So, we need to divide RFEQ by 2^28 prior to the calculation.
faa40074 · Lucas Russo · c29f4bed · faa40074
Commit faa40074 authored Apr 27, 2016 by Lucas Russo
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sm_ch_si57x.c src/sm_io/chips/sm_ch_si57x.c +1 -1

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--- a/src/sm_io/chips/sm_ch_si57x.c
+++ b/src/sm_io/chips/sm_ch_si57x.c
@@ -214,7 +214,7 @@ smch_err_e smch_si57x_get_freq (smch_si57x_t *self, double *freq)
            "frequency\n");

    /* rfreq is usually a large value. So we divide it first */
-    frequency = (double) self->rfreq / (self->hs_div * self->n1);
+    frequency = ((double) self->rfreq / POW_2_28) / (self->hs_div * self->n1);
    frequency *= self->fxtal;

    *freq = frequency;