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