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mcp4018: Add SET_DIGIPOT command to mcp4018 implementation (#5737)

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Added a SET_DIGIPOT command to the mcp4018 implementation.
Previously the mcp4018 was read only, and set at the time of
configuration.  This allows you to change the value during a
print, which is needed for some older printers that need to
lower the stepper current during preheating.

Signed-off-by: Jake Bordens <jake@allaboutjake.com>
This commit is contained in:
jake-b 2022-09-02 11:30:06 -03:00 • committed by GitHub
parent 354915d2ad
commit ae6c16422f
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3 changed files with 75 additions and 1 deletions
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15
klippy/extras/mcp4018.py
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@ -68,17 +68,30 @@ class SoftwareI2C:
class mcp4018:
def __init__(self, config):
self.printer = config.get_printer()
self.i2c = SoftwareI2C(config, 0x2f)
self.scale = config.getfloat('scale', 1., above=0.)
self.start_value = config.getfloat('wiper',
minval=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. / self.scale + .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., 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)