def initialize(self):
import adafruit_mcp4728
from adafruit_extended_bus import ExtendedI2C
self.setup_output_variables(OUTPUT_INFORMATION)
try:
self.dac = adafruit_mcp4728.MCP4728(
ExtendedI2C(self.output.i2c_bus),
address=int(str(self.output.i2c_location), 16))
self.channel = {
0: self.dac.channel_a,
1: self.dac.channel_b,
2: self.dac.channel_c,
3: self.dac.channel_d
}
# Set up Channels
for channel in channels_dict:
if self.options_channels['vref'][channel] == "internal":
self.channel[channel].vref = adafruit_mcp4728.Vref.INTERNAL
else:
self.channel[channel].vref = adafruit_mcp4728.Vref.VDD
self.channel[channel].gain = self.options_channels['gain'][
channel]
if (self.options_channels['state_start'][channel] == "value"
and
self.options_channels['state_start_value'][channel]):
self.channel[channel].value = int(
65535 *
(self.options_channels['state_start_value'][channel] /
self.vref))
self.dac.save_settings()
self.output_setup = True
except:
self.logger.exception("Error setting up Output")
def setup_output(self):
import adafruit_mcp4728
from adafruit_extended_bus import ExtendedI2C
self.setup_output_variables(OUTPUT_INFORMATION)
try:
self.dac = adafruit_mcp4728.MCP4728(
ExtendedI2C(self.output.i2c_bus),
address=int(str(self.output.i2c_location), 16))
self.channel = {
0: self.dac.channel_a,
1: self.dac.channel_b,
2: self.dac.channel_c,
3: self.dac.channel_d
}
# Channel A
if self.options_channels['vref'][0] == "internal":
self.channel[0].vref = adafruit_mcp4728.Vref.INTERNAL
else:
self.channel[0].vref = adafruit_mcp4728.Vref.VDD
self.channel[0].gain = self.options_channels['gain'][0]
if (self.options_channels['state_start'][0] == "value"
and self.options_channels['state_start_value'][0]):
self.channel[0].value = int(
65535 * (self.options_channels['state_start_value'][0] /
self.vref))
# Channel B
if self.options_channels['vref'][1] == "internal":
self.channel[1].vref = adafruit_mcp4728.Vref.INTERNAL
else:
self.channel[1].vref = adafruit_mcp4728.Vref.VDD
self.channel[1].gain = self.options_channels['gain'][1]
if (self.options_channels['state_start'][1] == "value"
and self.options_channels['state_start_value'][1]):
self.channel[1].value = int(
65535 * (self.options_channels['state_start_value'][1] /
self.vref))
# Channel C
if self.options_channels['vref'][2] == "internal":
self.channel[2].vref = adafruit_mcp4728.Vref.INTERNAL
else:
self.channel[2].vref = adafruit_mcp4728.Vref.VDD
self.channel[2].gain = self.options_channels['gain'][2]
if (self.options_channels['state_start'][2] == "value"
and self.options_channels['state_start_value'][2]):
self.channel[2].value = int(
65535 * (self.options_channels['state_start_value'][2] /
self.vref))
# Channel D
if self.options_channels['vref'][3] == "internal":
self.channel[3].vref = adafruit_mcp4728.Vref.INTERNAL
else:
self.channel[3].vref = adafruit_mcp4728.Vref.VDD
self.channel[3].gain = self.options_channels['gain'][3]
if (self.options_channels['state_start'][3] == "value"
and self.options_channels['state_start_value'][3]):
self.channel[3].value = int(
65535 * (self.options_channels['state_start_value'][3] /
self.vref))
self.dac.save_settings()
self.output_setup = True
except:
self.output_setup = False
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries # SPDX-License-Identifier: MIT import board import busio import adafruit_mcp4728 i2c = busio.I2C(board.SCL, board.SDA) mcp4728 = adafruit_mcp4728.MCP4728(i2c) mcp4728.channel_a.value = 65535 # Voltage = VDD mcp4728.channel_b.value = int(65535 / 2) # VDD/2 mcp4728.channel_c.value = int(65535 / 4) # VDD/4 mcp4728.channel_d.value = 0 # 0V
