268 lines
10 KiB
Python
268 lines
10 KiB
Python
# Support for button detection and callbacks
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#
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# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import logging
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######################################################################
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# Button state tracking
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######################################################################
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QUERY_TIME = .002
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RETRANSMIT_COUNT = 50
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class MCU_buttons:
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def __init__(self, printer, mcu):
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self.reactor = printer.get_reactor()
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self.mcu = mcu
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self.mcu.register_config_callback(self.build_config)
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self.pin_list = []
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self.callbacks = []
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self.invert = self.last_button = 0
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self.ack_cmd = None
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self.ack_count = 0
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def setup_buttons(self, pins, callback):
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mask = 0
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shift = len(self.pin_list)
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for pin_params in pins:
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if pin_params['invert']:
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self.invert |= 1 << len(self.pin_list)
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mask |= 1 << len(self.pin_list)
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self.pin_list.append((pin_params['pin'], pin_params['pullup']))
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self.callbacks.append((mask, shift, callback))
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def build_config(self):
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if not self.pin_list:
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return
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self.oid = self.mcu.create_oid()
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self.mcu.add_config_cmd("config_buttons oid=%d button_count=%d" % (
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self.oid, len(self.pin_list)))
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for i, (pin, pull_up) in enumerate(self.pin_list):
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self.mcu.add_config_cmd(
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"buttons_add oid=%d pos=%d pin=%s pull_up=%d" % (
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self.oid, i, pin, pull_up), is_init=True)
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cmd_queue = self.mcu.alloc_command_queue()
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self.ack_cmd = self.mcu.lookup_command(
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"buttons_ack oid=%c count=%c", cq=cmd_queue)
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clock = self.mcu.get_query_slot(self.oid)
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rest_ticks = self.mcu.seconds_to_clock(QUERY_TIME)
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self.mcu.add_config_cmd(
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"buttons_query oid=%d clock=%d"
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" rest_ticks=%d retransmit_count=%d" % (
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self.oid, clock, rest_ticks, RETRANSMIT_COUNT), is_init=True)
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self.mcu.register_response(self.handle_buttons_state,
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"buttons_state", self.oid)
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def handle_buttons_state(self, params):
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# Expand the message ack_count from 8-bit
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ack_count = self.ack_count
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ack_diff = (ack_count - params['ack_count']) & 0xff
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if ack_diff & 0x80:
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ack_diff -= 0x100
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msg_ack_count = ack_count - ack_diff
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# Determine new buttons
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buttons = params['state']
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new_count = msg_ack_count + len(buttons) - self.ack_count
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if new_count <= 0:
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return
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new_buttons = buttons[-new_count:]
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# Send ack to MCU
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self.ack_cmd.send([self.oid, new_count])
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self.ack_count += new_count
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# Call self.handle_button() with this event in main thread
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for b in new_buttons:
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self.reactor.register_async_callback(
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(lambda e, s=self, b=ord(b): s.handle_button(e, b)))
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def handle_button(self, eventtime, button):
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button ^= self.invert
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changed = button ^ self.last_button
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for mask, shift, callback in self.callbacks:
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if changed & mask:
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callback(eventtime, (button & mask) >> shift)
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self.last_button = button
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######################################################################
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# ADC button tracking
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######################################################################
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ADC_REPORT_TIME = 0.015
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ADC_DEBOUNCE_TIME = 0.025
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ADC_SAMPLE_TIME = 0.001
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ADC_SAMPLE_COUNT = 6
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class MCU_ADC_buttons:
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def __init__(self, printer, pin, pullup, debug=False):
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self.reactor = printer.get_reactor()
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self.buttons = []
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self.last_button = None
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self.last_pressed = None
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self.last_debouncetime = 0
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self.pullup = pullup
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self.debug = debug
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self.pin = pin
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self.min_value = self.max_value = None
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ppins = printer.lookup_object('pins')
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self.mcu_adc = ppins.setup_pin('adc', self.pin)
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self.mcu_adc.setup_minmax(ADC_SAMPLE_TIME, ADC_SAMPLE_COUNT)
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self.mcu_adc.setup_adc_callback(ADC_REPORT_TIME, self.adc_callback)
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def setup_button(self, min_value, max_value, callback):
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if self.min_value is None:
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self.min_value = min_value
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else:
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self.min_value = min(self.min_value, min_value)
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if self.max_value is None:
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self.max_value = max_value
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else:
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self.max_value = max(self.max_value, max_value)
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self.buttons.append((min_value, max_value, callback))
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def adc_callback(self, read_time, read_value):
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adc = max(.00001, min(.99999, read_value))
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r = self.pullup * adc / (1.0 - adc)
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self.reactor.register_async_callback(
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(lambda e, s=self, v=r: s.handle_button(e, v)))
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def get_button(self, value):
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if (self.min_value is not None and self.max_value is not None
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and self.min_value <= value <= self.max_value):
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for i, (min_value, max_value, cb) in enumerate(self.buttons):
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if min_value < value < max_value:
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return i
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return None
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def handle_button(self, eventtime, value):
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btn = self.get_button(int(value))
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# If the button changed, due to noise or pressing:
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if btn != self.last_button:
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# reset the debouncing timer
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self.last_debouncetime = eventtime
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# button debounce check & new button pressed
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if ((eventtime - self.last_debouncetime) >= ADC_DEBOUNCE_TIME
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and self.last_button == btn and self.last_pressed != btn):
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# release last_pressed
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if self.last_pressed is not None:
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self.call_button(eventtime, self.last_pressed, False)
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self.last_pressed = None
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if btn is not None:
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self.call_button(eventtime, btn, True)
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self.last_pressed = btn
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self.last_button = btn
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if self.debug is True:
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logging.info(
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"analog pin: %s value: %d" % (self.pin, int(value)))
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def call_button(self, eventtime, button, state):
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if button < len(self.buttons):
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minval, maxval, callback = self.buttons[button]
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callback(eventtime, state)
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######################################################################
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# Rotary Encoders
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######################################################################
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# Rotary encoder handler https://github.com/brianlow/Rotary
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# Copyright 2011 Ben Buxton (bb@cactii.net).
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# Licenced under the GNU GPL Version 3.
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R_START = 0x0
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R_CW_FINAL = 0x1
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R_CW_BEGIN = 0x2
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R_CW_NEXT = 0x3
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R_CCW_BEGIN = 0x4
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R_CCW_FINAL = 0x5
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R_CCW_NEXT = 0x6
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R_DIR_CW = 0x10
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R_DIR_CCW = 0x20
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R_DIR_MSK = 0x30
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# Use the full-step state table (emits a code at 00 only)
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ENCODER_STATES = (
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# R_START
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(R_START, R_CW_BEGIN, R_CCW_BEGIN, R_START),
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# R_CW_FINAL
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(R_CW_NEXT, R_START, R_CW_FINAL, R_START | R_DIR_CW),
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# R_CW_BEGIN
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(R_CW_NEXT, R_CW_BEGIN, R_START, R_START),
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# R_CW_NEXT
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(R_CW_NEXT, R_CW_BEGIN, R_CW_FINAL, R_START),
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# R_CCW_BEGIN
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(R_CCW_NEXT, R_START, R_CCW_BEGIN, R_START),
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# R_CCW_FINAL
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(R_CCW_NEXT, R_CCW_FINAL, R_START, R_START | R_DIR_CCW),
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# R_CCW_NEXT
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(R_CCW_NEXT, R_CCW_FINAL, R_CCW_BEGIN, R_START)
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)
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class RotaryEncoder:
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def __init__(self, cw_callback, ccw_callback):
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self.cw_callback = cw_callback
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self.ccw_callback = ccw_callback
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self.encoder_state = R_START
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def encoder_callback(self, eventtime, state):
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es = ENCODER_STATES[self.encoder_state & 0xf][state & 0x3]
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self.encoder_state = es
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if es & R_DIR_MSK == R_DIR_CW:
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self.cw_callback(eventtime)
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elif es & R_DIR_MSK == R_DIR_CCW:
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self.ccw_callback(eventtime)
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######################################################################
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# Button registration code
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######################################################################
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class PrinterButtons:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.mcu_buttons = {}
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self.adc_buttons = {}
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def register_adc_button(
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self, pin, min_val, max_val, pullup, callback, debug=False):
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adc_buttons = self.adc_buttons.get(pin)
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if adc_buttons is None:
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self.adc_buttons[pin] = adc_buttons = MCU_ADC_buttons(
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self.printer, pin, pullup, debug)
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adc_buttons.setup_button(min_val, max_val, callback)
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def register_adc_button_push(
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self, pin, min_val, max_val, pullup, callback, debug=False):
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def helper(eventtime, state, callback=callback):
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if state:
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callback(eventtime)
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self.register_adc_button(pin, min_val, max_val, pullup, helper, debug)
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def register_buttons(self, pins, callback):
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# Parse pins
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ppins = self.printer.lookup_object('pins')
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mcu = mcu_name = None
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pin_params_list = []
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for pin in pins:
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pin_params = ppins.lookup_pin(pin, can_invert=True, can_pullup=True)
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if mcu is not None and pin_params['chip'] != mcu:
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raise ppins.error("button pins must be on same mcu")
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mcu = pin_params['chip']
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mcu_name = pin_params['chip_name']
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pin_params_list.append(pin_params)
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# Register pins and callback with the appropriate MCU
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mcu_buttons = self.mcu_buttons.get(mcu_name)
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if (mcu_buttons is None
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or len(mcu_buttons.pin_list) + len(pin_params_list) > 8):
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self.mcu_buttons[mcu_name] = mcu_buttons = MCU_buttons(
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self.printer, mcu)
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mcu_buttons.setup_buttons(pin_params_list, callback)
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def register_rotary_encoder(self, pin1, pin2, cw_callback, ccw_callback):
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re = RotaryEncoder(cw_callback, ccw_callback)
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self.register_buttons([pin1, pin2], re.encoder_callback)
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def register_button_push(self, pin, callback):
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def helper(eventtime, state, callback=callback):
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if state:
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callback(eventtime)
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self.register_buttons([pin], helper)
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def load_config(config):
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return PrinterButtons(config)
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