kopia lustrzana https://github.com/peterhinch/micropython-samples
39 wiersze
966 B
Python
39 wiersze
966 B
Python
# pseudorandom numbers for MicroPython. ISR friendly version.
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# Probably poor quality numbers but useful in test scripts
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# Based on xorshift32 here https://en.wikipedia.org/wiki/Xorshift
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# Author: Peter Hinch
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# Copyright Peter Hinch 2020 Released under the MIT license
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# Example usage to produce numbers between 0 and 99
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# rand = cheap_rand(100)
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# successive calls to rand() will produce the required result.
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def cheap_rand(modulo, seed=0x3fba2):
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x = seed
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def func():
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nonlocal x
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x ^= (x & 0x1ffff) << 13;
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x ^= x >> 17;
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x ^= (x & 0x1ffffff) << 5;
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return x % modulo
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return func
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# The sum total of my statistical testing
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#import pyb, micropython, time
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#rand = cheap_rand(1000)
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#sum = 0
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#cnt = 0
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#def avg(n):
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#global sum, cnt
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#sum += n
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#cnt += 1
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#def cb(t):
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#n = rand()
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#micropython.schedule(avg, n)
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#t = pyb.Timer(1, freq=20, callback=cb)
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#while True:
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#time.sleep(1)
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#print(sum/cnt)
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