#!/usr/bin/env python3

import numpy as np
import matplotlib.pyplot as plt

PLL_FREQ = 800*10**6 # Mhz

def main():
    # 8kHz to 150MHz
    out_freq = np.uint32(np.arange(1*10**6, 160*10**6, 10))

    fdiv = PLL_FREQ / out_freq
    rm = PLL_FREQ % out_freq

    c = np.uint32(0x0FFFFF);
    a = np.uint32(fdiv)
    b = np.uint32(np.uint64(c) * np.uint64(rm) / out_freq)

    ideal_freq = PLL_FREQ / fdiv
    real_freq = PLL_FREQ / (a + b/c)

    err = (ideal_freq - real_freq)
    out_freq = out_freq / 10**6
    ideal_freq = ideal_freq / 10**6
    real_freq = real_freq / 10**6


    p1  = 128 * a + np.floor(128 * b / c) - 512;
    p2 = 128 * b - c * np.uint32(128 * b / c);


    #plt.plot(out_freq, ideal_freq)
    #plt.plot(out_freq, real_freq)

    plt.plot(out_freq, err)




    plt.show()

if __name__ == '__main__':
    main()