On MD3x0 baseband, fixed PLL going nuts for some frequencies (e.g. 430.0MHz) and causing the radio transmitting on a shifted band.

platform/drivers/baseband/pll_MD3x0.c

@@ -88,6 +88,22 @@ void pll_setFrequency(float freq, uint8_t clkDiv)
     float Ndiv = floor(K) - 32.0;
     float Ndnd = round(262144*(K - Ndiv - 32.0));
 
+    /*
+     * With PLL in fractional mode, dividend range is [-131017 +131071]. If our
+     * computation gives a wrong result, we decrement the reference clock divider
+     * and redo the computations.
+     *
+     * TODO: better investigate on how to put PLL in unsigned dividend mode.
+     */
+    if(((uint32_t) Ndnd) >= 131070)
+    {
+        clkDiv -= 1;
+        K = freq/(REF_CLK/((float) clkDiv));
+        Ndiv = floor(K) - 32.0;
+        Ndnd = round(262144*(K - Ndiv - 32.0));
+
+    }
+
     uint32_t dnd = ((uint32_t) Ndnd);
     uint16_t dndMsb = dnd >> 8;
     uint16_t dndLsb = dnd & 0x00FF;