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# SPI DAC DAC084S085 implementation
#
# Copyright (C) 2021 Lorenzo Franco <lorenzo.franco@lorenzing.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
from . import bus
class dac084S085:
def __init__(self, config):
self.spi = bus.MCU_SPI_from_config(
config, 1, pin_option="enable_pin", default_speed=10000000)
scale = config.getfloat('scale', 1., above=0.)
for chan, name in enumerate("ABCD"):
val = config.getfloat('channel_%s' % (name,), None,
minval=0., maxval=scale)
if val is not None:
self.set_register(chan, int(val * 255. / scale))
def set_register(self, chan, value):
b1 = (chan << 6) | (1 << 4) | ((value >> 4) & 0x0f)
b2 = (value << 4) & 0xf0
self.spi.spi_send([b1, b2])
def load_config_prefix(config):
return dac084S085(config)
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