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# MCP4451 digipot code
#
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import mcu
WiperRegisters = [0x00, 0x01, 0x06, 0x07]
class mcp4451:
def __init__(self, config):
printer = config.get_printer()
self.mcu = mcu.get_printer_mcu(printer, config.get('mcu', 'mcu'))
self.i2c_addr = config.getint('i2c_address')
scale = config.getfloat('scale', 1., above=0.)
wipers = [None]*4
for i in range(len(wipers)):
val = config.getfloat('wiper_%d' % (i,), None,
minval=0., maxval=scale)
if val is not None:
wipers[i] = int(val * 255. / scale + .5)
self.add_config_cmd(0x04, 0xff)
self.add_config_cmd(0x0a, 0xff)
for reg, val in zip(WiperRegisters, wipers):
if val is not None:
self.add_config_cmd(reg, val)
def add_config_cmd(self, reg, val):
self.mcu.add_config_cmd("i2c_send data=%02x%02x%02x" % (
self.i2c_addr, (reg << 4) | ((val >> 8) & 0x03), val), is_init=True)
def load_config_prefix(config):
return mcp4451(config)
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