from Si5351 import Si5351
import fractions
def asservissement(x):
	freq=((x/1e7)*25);  # frequence de l'ordre de 720 MHz ajustable `a mieux que le Hz
	a=int(freq/25)
	u=(freq-a*25)/25;       # 700=28*25 i.e. a=28
	t=fractions.Fraction(u).limit_denominator(1000000);
	b=t.numerator
	c=t.denominator

	si = Si5351(busnum=1)


	# vco = 25 MHz * (28 + 8 / 10) = 720 MHz
	si.setupPLL(si.PLL_A, a, b, c)
	#si.setupPLL(si.PLL_A, 24, 2, 3)
	
	# out0 = 720 MHz / 25 = 28.8 MHz 
	si.setupMultisynth(0, si.PLL_A, int(25))
	
	# out2 = 720 MHz / 72 = 10 MHz 
	si.setupMultisynth(1, si.PLL_A, int(72))
	si.setupMultisynth(2, si.PLL_A, int(72))
	
	si.enableOutputs(True)