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RPiIO.py
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#!/usr/bin/python3
"""
Telex Device - Button and LED controls for Rasperry Pi (Zero W)
"""
__author__ = "Jochen Krapf"
__email__ = "jk@nerd2nerd.org"
__copyright__ = "Copyright 2020, JK"
__license__ = "GPL3"
__version__ = "0.0.1"
#https://www.programcreek.com/python/example/93338/pigpio.pi
import os
import time
import pigpio # http://abyz.co.uk/rpi/pigpio/python.html pip install pigpio
import log
def LOG(text:str, level:int=3):
log.LOG('\033[5;30;43m<'+text+'>\033[0m', level)
if os.name == 'nt': # debug on windows PC
REMOTE_IP = '10.0.0.40' # IP of the remote RPi with its GPIO
else:
REMOTE_IP = None # GPIO on this RPi itself
pi = pigpio.pi(REMOTE_IP)
if not pi.connected:
raise Exception('no connection to remote RPi')
# init GPIOs
pi.set_pad_strength(0, 8)
def pi_exit():
if pi:
pi.stop()
#######
class LED_PWM():
''' Handle a LED connected to GPIO. LED connected to GND '''
def __init__(self, pin):
#super().__init__()
self._pin = pin
self._dst = 0
self._val = 0
self._prv = -1
pi.set_mode(pin, pigpio.OUTPUT) # output
pi.write(pin, 0) # off
pi.set_PWM_frequency(pin, 200) # 200Hz
pi.set_PWM_range(pin, 400) # 0...20²
pi.set_PWM_dutycycle(pin, 0) # off
def __del__(self):
#pi.set_PWM_dutycycle(self._pin, 0) # off
pass
def process_fade(self):
if self._val > self._dst:
self._val -= 1
if self._val < self._dst:
self._val += 1
val = self._val
if val < 0:
val = 0
if val > 20:
val = 20
if self._prv != val:
self._prv = val
pi.set_PWM_dutycycle(self._pin, val*val) # output with gamma
def set_fade_dest(self, dst:int, val:int=None):
self._dst = dst
if self._val is not None:
self._val = val
def set_fade_value(self, val:int):
self._val = val
def add_fade_value(self, val:int):
self._val += val
if self._val > 40:
self._val = 40
if self._val < -20:
self._val = -20
#######
class LED():
''' Handle a LED connected to GPIO. LED connected to GND '''
def __init__(self, pin):
#super().__init__()
self._pin = pin
self._val = 0
#self._prv = -1
pi.set_mode(pin, pigpio.OUTPUT) # output
pi.write(pin, 0) # off
def __del__(self):
pass
#pi.write(self._pin, 0) # off
def value(self, val:bool=None):
if val is None:
return self._val
self._val = val
pi.write(self._pin, val)
def on(self):
self.value(True)
def off(self):
self.value(False)
#######
class Button():
''' Handle a button connected to GPIO. Buttons connected to GND and NO-mode
callback:
def _callback_button([self,] gpio, level, tick):
'''
def __init__(self, pin, callback):
#super().__init__()
self._pin = pin
pi.set_mode(pin, pigpio.INPUT)
pi.set_pull_up_down(pin, pigpio.PUD_UP)
pi.set_glitch_filter(pin, 50000) # 50ms
time.sleep(0.1)
#for _ in range(50000):
# if pi.read(self._pin):
# break
self._cb = pi.callback(pin, pigpio.FALLING_EDGE, callback)
def __del__(self):
self._cb.cancel() # disable
def is_pressed(self):
return pi.read(self._pin) == 0
#######
class NumberSwitch():
''' Handle a number switch (NS) connected to GPIO. Switch connected to GND and NC-mode
callback:
def _callback_number_switch([self,] text:str):
'''
def __init__(self, pin:int, callback, active_L_H:bool=False):
#super().__init__()
self._cb = None
self._time_squelch = 0
self._is_enabled = False
self._pin = pin
self._callback = callback
self._active_L_H = active_L_H
pi.set_mode(pin, pigpio.INPUT)
pi.set_pull_up_down(pin, pigpio.PUD_DOWN if self._active_L_H else pigpio.PUD_UP)
pi.set_glitch_filter(pin, 5000) # 5ms
def __del__(self):
if self._cb:
self._cb.cancel() # disable
def enable(self, enable:bool):
self._set_time_squelch(0.25)
self._is_enabled = enable
if self._cb:
self._cb.cancel()
self._cb = None
self._pulse_dial_count = 0
if self._pin:
if enable:
self._cb = pi.callback(self._pin, pigpio.RISING_EDGE if self._active_L_H else pigpio.FALLING_EDGE, self._callback_pulse_dial)
pi.set_watchdog(self._pin, 200) # 200ms
else:
pi.set_watchdog(self._pin, 0) # disable
def _callback_pulse_dial(self, gpio, level, tick):
if time.monotonic() <= self._time_squelch:
return
if not self._is_enabled:
return
if level == pigpio.TIMEOUT: # watchdog timeout
#LOG(str(gpio)+str(level)+str(tick), 5) # debug
if self._pulse_dial_count:
if self._pulse_dial_count >= 10:
self._pulse_dial_count = 0
self._callback(str(self._pulse_dial_count))
self._pulse_dial_count = 0
elif (self._active_L_H and level == pigpio.HIGH) or (not self._active_L_H and level == pigpio.LOW):
self._pulse_dial_count += 1
self._callback('.')
#print('+', end='')
else:
pass
#print('$', end='')
def _set_time_squelch(self, t_diff:float):
t = time.monotonic() + t_diff
if self._time_squelch < t:
self._time_squelch = t
#######
class Observer():
def __init__(self, pin, inv, stable_count):
self._pin = pin
self._inv = inv
self._stable_count = stable_count
self._line_stable = None
self._counter = 0
def process(self) -> bool:
line = (not pi.read(self._pin)) == self._inv # int->bool, logical xor
if line != self._line_stable:
self._counter += 1
if self._counter == self._stable_count:
self._line_stable = line
#LOG('Line state change: '+str(rxd), 3)
return line
else:
self._counter = 0
def reset(self):
self._counter = 0
def get_state(self) -> bool:
return self._line_stable