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Minor README updates.

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Peter Hinch 2021-01-24 10:33:49 +00:00
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@ -219,12 +219,16 @@ On the Pyboard V1.1, true random numbers may be generated rapidly with
`pyb.rng()` which uses a hardware random number generator on the
microcontroller.
There are two use cases for the pseudo random number generator. Firstly on
platforms lacking a hardware generator (e.g. the Pyboard Lite). And secondly
where repeatable results are required, for example in testing. A pseudo random
number generator is seeded with an arbitrary initial value. On each call to the
function it will return a random number, but (given the same seed) the sequence
of numbers following initialisation will always be the same.
There are a few use-cases for pseudo random number generators. Some platforms
lack a hardware generator (e.g. the Pyboard Lite) and some ports don't support
`uos.urandom`. There is also a case for running a RNG in an interrupt service
routine.
Pseudo random number generators provide repeatable sequences of numbers which
can be an advantage, for example in testing. The RNG is seeded with an initial
value. On each call to the function it will return a random number, but (given
the same seed) the sequence of numbers following initialisation will always be
the same.
See [random.py](./random/random.py) for usage and timing documentation. The
[yasmarang generator](./random/yasmarang.py) is also included, along with my