122 lines
3.4 KiB
Python
122 lines
3.4 KiB
Python
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# -*- coding: utf-8 -*-
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"""MicroPython rotary encoder library.
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Usage:
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from time import sleep_ms
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from encoder import Encoder
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# Connect CLK to D6, DT to D5, GND to GND and + to 3V3
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enc = Encoder(pin_clk=12, pin_dt=14)
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def readloop(e):
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oldval = 0
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while True:
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val = enc.value
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if oldval != val:
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print(val)
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oldval = val
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sleep_ms(50)
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readloop(e)
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Source :
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https://github.com/SpotlightKid/micropython-stm-lib/blob/master/encoder/encoder.py
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"""
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from machine import Pin
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ENC_STATES = (
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0, # 00 00
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-1, # 00 01
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1, # 00 10
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0, # 00 11
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1, # 01 00
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0, # 01 01
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0, # 01 10
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-1, # 01 11
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-1, # 10 00
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0, # 10 01
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0, # 10 10
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1, # 10 11
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0, # 11 00
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1, # 11 01
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-1, # 11 10
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0 # 11 11
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)
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ACCEL_THRESHOLD = const(5)
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class Encoder(object):
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def __init__(self, pin_clk, pin_dt, pin_mode=None, clicks=1,
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min_val=0, max_val=100, accel=0, reverse=False):
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self.pin_clk = (pin_clk if isinstance(pin_clk, Pin) else
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Pin(pin_clk, Pin.IN, pin_mode))
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self.pin_dt = (pin_dt if isinstance(pin_dt, Pin) else
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Pin(pin_dt, Pin.IN, pin_mode))
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self.min_val = min_val * clicks
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self.max_val = max_val * clicks
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self.accel = int((max_val - min_val) / 100 * accel)
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self.max_accel = int((max_val - min_val) / 2)
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self.clicks = clicks
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self.reverse = 1 if reverse else -1
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# The following variables are assigned to in the interrupt callback,
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# so we have to allocate them here.
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self._value = 0
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self._readings = 0
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self._state = 0
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self.cur_accel = 0
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self.set_callbacks(self._callback)
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def _callback(self, line):
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self._readings = (self._readings << 2 | self.pin_clk.value() << 1 |
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self.pin_dt.value()) & 0x0f
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self._state = ENC_STATES[self._readings] * self.reverse
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if self._state:
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self.cur_accel = min(self.max_accel, self.cur_accel + self.accel)
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self._value = min(self.max_val, max(self.min_val, self._value +
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(1 + (self.cur_accel >> ACCEL_THRESHOLD)) *
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self._state))
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def set_callbacks(self, callback=None):
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mode = Pin.IRQ_RISING | Pin.IRQ_FALLING
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self.irq_clk = self.pin_clk.irq(trigger=mode, handler=callback)
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self.irq_dt = self.pin_dt.irq(trigger=mode, handler=callback)
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def close(self):
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self.set_callbacks(None)
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self.irq_clk = self.irq_dt = None
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@property
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def value(self):
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return self._value // self.clicks
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def reset(self):
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self._value = 0
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def test(enc=None, **kwargs):
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from time import sleep_ms
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rate = kwargs.pop('rate', 20)
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if not isinstance(enc, Encoder):
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cls = kwargs.pop('encoder_cls', Encoder)
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kwargs.setdefault('pin_clk', 12)
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kwargs.setdefault('pin_dt', 14)
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kwargs.setdefault('clicks', 4)
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enc = cls(**kwargs)
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oldval = 0
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try:
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while True:
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val = enc.value
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if oldval != val:
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print(val)
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oldval = val
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enc.cur_accel = max(0, enc.cur_accel - enc.accel)
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sleep_ms(1000 // rate)
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except:
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enc.close()
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