output_pin: Move pwm and digital output pins to new module in extras/

Rename the digital_output, pwm_output, and static_pwm_output config
sections to output_pin and move to a new module in the extras/
directory.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/output_pin.py

@@ -0,0 +1,69 @@
+# Code to configure miscellaneous chips
+#
+# Copyright (C) 2017,2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+PIN_MIN_TIME = 0.100
+
+class PrinterOutputPin:
+    def __init__(self, config):
+        self.printer = config.get_printer()
+        ppins = self.printer.lookup_object('pins')
+        self.is_pwm = config.getboolean('pwm', False)
+        if self.is_pwm:
+            self.mcu_pin = ppins.setup_pin('pwm', config.get('pin'))
+            cycle_time = config.getfloat('cycle_time', 0.100, above=0.)
+            hardware_pwm = config.getboolean('hardware_pwm', False)
+            self.mcu_pin.setup_cycle_time(cycle_time, hardware_pwm)
+            self.scale = config.getfloat('scale', 1., above=0.)
+        else:
+            self.mcu_pin = ppins.setup_pin('digital_out', config.get('pin'))
+            self.scale = 1.
+        self.mcu_pin.setup_max_duration(0.)
+        self.last_value_time = 0.
+        static_value = config.getfloat('static_value', None,
+                                       minval=0., maxval=self.scale)
+        if static_value is not None:
+            self.is_static = True
+            self.last_value = static_value / self.scale
+            self.mcu_pin.setup_start_value(
+                self.last_value, self.last_value, True)
+        else:
+            self.is_static = False
+            self.last_value = config.getfloat(
+                'value', 0., minval=0., maxval=self.scale) / self.scale
+            shutdown_value = config.getfloat(
+                'shutdown_value', 0., minval=0., maxval=self.scale) / self.scale
+            self.mcu_pin.setup_start_value(self.last_value, shutdown_value)
+        self.gcode = self.printer.lookup_object('gcode')
+        self.gcode.register_command("SET_PIN", self.cmd_SET_PIN,
+                                    desc=self.cmd_SET_PIN_help)
+    cmd_SET_PIN_help = "Set the value of an output pin"
+    def cmd_SET_PIN(self, params):
+        pin_name = self.gcode.get_str('PIN', params)
+        pin = self.printer.lookup_object('output_pin ' + pin_name, None)
+        if pin is not self:
+            if pin is None:
+                raise self.gcode.error("Pin not configured")
+            return pin.cmd_SET_PIN(params)
+        if self.is_static:
+            raise self.gcode.error("Static pin can not be changed at run-time")
+        value = self.gcode.get_float('VALUE', params) / self.scale
+        if value == self.last_value:
+            return
+        print_time = self.printer.lookup_object('toolhead').get_last_move_time()
+        print_time = max(print_time, self.last_value_time + PIN_MIN_TIME)
+        if self.is_pwm:
+            if value < 0. or value > 1.:
+                raise self.gcode.error("Invalid pin value")
+            self.mcu_pin.set_pwm(print_time, value)
+        else:
+            if value not in [0., 1.]:
+                raise self.gcode.error("Invalid pin value")
+            self.mcu_pin.set_digital(print_time, value)
+        self.last_value = value
+        self.last_value_time = print_time
+
+def load_config_prefix(config):
+    return PrinterOutputPin(config)