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# MCP4018 digipot support
#
# Copyright (C) 2019-2025 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
from . import bus
class mcp4018:
def __init__(self, config):
self.printer = config.get_printer()
self.i2c = bus.MCU_I2C_from_config(config, default_addr=0x2F)
self.scale = config.getfloat("scale", 1.0, above=0.0)
self.start_value = config.getfloat("wiper", minval=0.0, maxval=self.scale)
config.get_printer().register_event_handler(
"klippy:connect", self.handle_connect
)
# Register commands
self.name = config.get_name().split()[1]
gcode = self.printer.lookup_object("gcode")
gcode.register_mux_command(
"SET_DIGIPOT",
"DIGIPOT",
self.name,
self.cmd_SET_DIGIPOT,
desc=self.cmd_SET_DIGIPOT_help,
)
def handle_connect(self):
self.set_dac(self.start_value)
def set_dac(self, value):
val = int(value * 127.0 / self.scale + 0.5)
self.i2c.i2c_write([val])
cmd_SET_DIGIPOT_help = "Set digipot value"
def cmd_SET_DIGIPOT(self, gcmd):
wiper = gcmd.get_float("WIPER", minval=0.0, maxval=self.scale)
if wiper is not None:
self.set_dac(wiper)
gcmd.respond_info(
"New value for DIGIPOT = %s, wiper = %.2f" % (self.name, wiper)
)
def load_config_prefix(config):
return mcp4018(config)
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