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29 lines
703 B
Python
29 lines
703 B
Python
# frequ in MHz
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f=18.432
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# Master clock:
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#ftarg=64.0
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# USB Clock:
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ftarg=48.0
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# PLL range: 60 MHz <= PLL <= 130 MHz
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# MUL range: 4 <= MUL <= 7
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min_err_val=[1.0, 0.0]
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min_err=f
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#for mul in range(1, 8):
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for mul in range(1, 36):
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#for div in range(1, 0x20):
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for div in range(1, 255):
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freq=(f*mul/(1.0*div))
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err=abs(freq - ftarg)
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print(mul, div, freq, err)
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if(err < min_err):
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min_err_val=[mul, div]
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print("last minerr: %f, new minerr: %f, mul: %d, div: %d" % (min_err, err, mul, div))
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min_err=err
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print("MUL-DIV values:")
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print(min_err_val)
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print("Absolute error: %0.2f %% " % ((f*min_err_val[0]/min_err_val[1]-ftarg)/ftarg*100))
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