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mcp4018: Remove support for manual i2c - use standard mcu software i2c instead

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2025-07-14 13:27:17 -04:00
parent 354b1e666b
commit a209d4db5b
5 changed files with 38 additions and 94 deletions
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69
klippy/extras/mcp4018.py
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@@ -1,75 +1,14 @@
# MCP4018 digipot support (via bit-banging)
# MCP4018 digipot support
#
# Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
# Copyright (C) 2019-2025 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
class SoftwareI2C:
def __init__(self, config, addr):
self.addr = addr << 1
self.update_pin_cmd = None
# Lookup pins
ppins = config.get_printer().lookup_object('pins')
scl_pin = config.get('scl_pin')
scl_params = ppins.lookup_pin(scl_pin, share_type='sw_scl')
self.mcu = scl_params['chip']
self.scl_pin = scl_params['pin']
self.scl_main = scl_params.get('class')
if self.scl_main is None:
self.scl_main = scl_params['class'] = self
self.scl_oid = self.mcu.create_oid()
self.cmd_queue = self.mcu.alloc_command_queue()
self.mcu.register_config_callback(self.build_config)
else:
self.scl_oid = self.scl_main.scl_oid
self.cmd_queue = self.scl_main.cmd_queue
sda_params = ppins.lookup_pin(config.get('sda_pin'))
self.sda_oid = self.mcu.create_oid()
if sda_params['chip'] != self.mcu:
raise ppins.error("%s: scl_pin and sda_pin must be on same mcu" % (
config.get_name(),))
self.mcu.add_config_cmd("config_digital_out oid=%d pin=%s"
" value=%d default_value=%d max_duration=%d" % (
self.sda_oid, sda_params['pin'], 1, 1, 0))
def get_mcu(self):
return self.mcu
def build_config(self):
self.mcu.add_config_cmd("config_digital_out oid=%d pin=%s value=%d"
" default_value=%d max_duration=%d" % (
self.scl_oid, self.scl_pin, 1, 1, 0))
self.update_pin_cmd = self.mcu.lookup_command(
"update_digital_out oid=%c value=%c", cq=self.cmd_queue)
def i2c_write(self, msg, minclock=0, reqclock=0):
msg = [self.addr] + msg
send = self.scl_main.update_pin_cmd.send
# Send ack
send([self.sda_oid, 0], minclock=minclock, reqclock=reqclock)
send([self.scl_oid, 0], minclock=minclock, reqclock=reqclock)
# Send bytes
sda_last = 0
for data in msg:
# Transmit 8 data bits
for i in range(8):
sda_next = not not (data & (0x80 >> i))
if sda_last != sda_next:
sda_last = sda_next
send([self.sda_oid, sda_last],
minclock=minclock, reqclock=reqclock)
send([self.scl_oid, 1], minclock=minclock, reqclock=reqclock)
send([self.scl_oid, 0], minclock=minclock, reqclock=reqclock)
# Transmit clock for ack
send([self.scl_oid, 1], minclock=minclock, reqclock=reqclock)
send([self.scl_oid, 0], minclock=minclock, reqclock=reqclock)
# Send stop
if sda_last:
send([self.sda_oid, 0], minclock=minclock, reqclock=reqclock)
send([self.scl_oid, 1], minclock=minclock, reqclock=reqclock)
send([self.sda_oid, 1], minclock=minclock, reqclock=reqclock)
from . import bus
class mcp4018:
def __init__(self, config):
self.printer = config.get_printer()
self.i2c = SoftwareI2C(config, 0x2f)
self.i2c = bus.MCU_I2C_from_config(config, default_addr=0x2f)
self.scale = config.getfloat('scale', 1., above=0.)
self.start_value = config.getfloat('wiper',
minval=0., maxval=self.scale)