From c2086796bf1ccd755e6bd3d47168031c67bf0780 Mon Sep 17 00:00:00 2001 From: Kevin O'Connor Date: Sat, 24 Nov 2018 19:46:28 -0500 Subject: mcp4728: Add initial support for the mcp4728 i2c dac chip Signed-off-by: Kevin O'Connor --- klippy/extras/mcp4728.py | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 klippy/extras/mcp4728.py (limited to 'klippy/extras/mcp4728.py') diff --git a/klippy/extras/mcp4728.py b/klippy/extras/mcp4728.py new file mode 100644 index 00000000..6f2eeb29 --- /dev/null +++ b/klippy/extras/mcp4728.py @@ -0,0 +1,23 @@ +# MCP4728 dac code +# +# Copyright (C) 2018 Kevin O'Connor +# +# This file may be distributed under the terms of the GNU GPLv3 license. +import bus + +class mcp4728: + def __init__(self, config): + self.i2c = bus.MCU_I2C_from_config(config, default_addr=0) + scale = config.getfloat('scale', 1., above=0.) + # Configure registers + for i, name in enumerate('abcd'): + val = config.getfloat('channel_%s' % (name,), None, + minval=0., maxval=scale) + if val is not None: + self.set_dac(i, int(val * 4095. / scale + .5)) + def set_dac(self, dac, value): + self.i2c.i2c_write([0x40 | (dac << 1), + (value >> 8) & 0x0f, value & 0xff]) + +def load_config_prefix(config): + return mcp4728(config) -- cgit v1.2.3-70-g09d2