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README: add detail to encoder section.

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Peter Hinch 2021-07-04 12:24:28 +01:00
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@ -216,7 +216,14 @@ the ESP8266 limits performance. ESP32 has similar limitations.
See also [this asynchronous driver](https://github.com/peterhinch/micropython-async/blob/master/v3/docs/DRIVERS.md#6-quadrature-encoders) See also [this asynchronous driver](https://github.com/peterhinch/micropython-async/blob/master/v3/docs/DRIVERS.md#6-quadrature-encoders)
intended for control knobs based on quadrature switches like intended for control knobs based on quadrature switches like
[this Adafruit product](https://www.adafruit.com/product/377). [this Adafruit product](https://www.adafruit.com/product/377). There are two
aspects to this. Firstly, the solutions in this repo run callbacks in an
interrupt context. This is necessary in applications like NC machines where
performance is paramount, but it can be problematic in applications for control
knobs where a user adjustment can trigger complex application behavior. The
asynchronous driver runs the callback in a `uasyncio` context. Secondly there
can be practical timing and sensitivity issues with control knobs which the
driver aims to address.
## 4.8 Pseudo random number generators ## 4.8 Pseudo random number generators