void si5351aSetFrequency(uint32_t frequency)
{
uint32_t pllFreq;
uint32_t xtalFreq = XTAL_FREQ;
uint32_t l;
float f;
uint8_t mult;
uint32_t num;
uint32_t denom;
uint32_t divider;
divider = 900000000 / frequency;// Calculate the division ratio. 900,000,000 is the maximum internal
// PLL frequency: 900MHz
if (divider % 2) divider--; // Ensure an even integer division ratio
pllFreq = divider * frequency; // Calculate the pllFrequency: the divider * desired output frequency
mult = pllFreq / xtalFreq; // Determine the multiplier to get to the required pllFrequency
l = pllFreq % xtalFreq; // It has three parts:
f = l; // mult is an integer that must be in the range 15..90
f *= 1048575; // num and denom are the fractional parts, the numerator and denominator
f /= xtalFreq; // each is 20 bits (range 0..1048575)
num = f; // the actual multiplier is mult + num / denom
denom = 1048575; // For simplicity we set the denominator to the maximum 1048575
// Set up PLL A with the calculated multiplication ratio
setupPLL(SI_SYNTH_PLL_A, mult, num, denom);
Веселин, там
тот же код что и у меня
