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# I2CDAC.py - for LibTiePie 0.5+
#
# This example demonstrates how to use an I2C host supported by LibTiePie.
# It shows how to control an Analog Devices AD5667 dual 16-bit DAC on I2C address 12.
#
# Find more information on http://www.tiepie.com/LibTiePie .
from __future__ import print_function
import sys
import libtiepie
from printinfo import *
AD5667_ADDRESS = 12
# AD5667 registers:
AD5667_REG_DAC_A = 0x00
AD5667_REG_DAC_B = 0x01
AD5667_REG_DAC_ALL = 0x07
# AD5667 commands:
AD5667_CMD_WRITE = 0x00
AD5667_CMD_UPDATE = 0x08
AD5667_CMD_WRITE_UPDATE_ALL = 0x10
AD5667_CMD_WRITE_UPDATE = 0x18
AD5667_CMD_POWER = 0x20
AD5667_CMD_RESET = 0x28
AD5667_CMD_LDAC_SETUP = 0x30
AD5667_CMD_REF_SETUP = 0x38
# Print library info:
print_library_info()
# Search for devices:
libtiepie.device_list.update()
# Try to open an I2C host:
i2c = None
for item in libtiepie.device_list:
if item.can_open(libtiepie.DEVICETYPE_I2CHOST):
i2c = item.open_i2c_host()
if i2c:
break
if i2c:
try:
# Print I2C info:
print_device_info(i2c)
# Turn on internal reference for DAC A:
i2c.write_byte_word(AD5667_ADDRESS, AD5667_CMD_REF_SETUP or AD5667_REG_DAC_A, 1)
# Set DAC A to mid level:
i2c.write_byte_word(AD5667_ADDRESS, AD5667_CMD_WRITE_UPDATE or AD5667_REG_DAC_A, 0x8000)
except Exception as e:
print('Exception: ' + e.message)
sys.exit(1)
# Close I2C host:
del i2c
else:
print('No I2C host available!')
sys.exit(1)
sys.exit(0)
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