33 lines
1.2 KiB
Python
33 lines
1.2 KiB
Python
# 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)
|