#! /usr/bin/python

from labjack import ljm
import sys
# Open first found LabJack
handle = ljm.open(ljm.constants.dtANY, ljm.constants.ctANY, "ANY")
info = ljm.getHandleInfo(handle)
print("Opened a LabJack with Device type: %i, Connection type: %i,\n" \
    "Serial number: %i, IP address: %s, Port: %i,\nMax bytes per MB: %i" % \
    (info[0], info[1], info[2], ljm.numberToIP(info[3]), info[4], info[5]))
# Configure the I2C communication.
ljm.eWriteName(handle, "I2C_SDA_DIONUM", 17) # SDA pin number = 17 (CIO1)
ljm.eWriteName(handle, "I2C_SCL_DIONUM", 16) # SCL pin number = 16 (CIO0)
ljm.eWriteName(handle, "I2C_SPEED_THROTTLE", 65516)
ljm.eWriteName(handle, "I2C_OPTIONS", 0) # Options
#
ljm.eWriteName(handle, "I2C_SLAVE_ADDRESS", 35) # Slave Address of the I2C chip = 35 (0x23)
ljm.eWriteName(handle, "I2C_NUM_BYTES_TX", 1) # Set the number of bytes to transmit
ljm.eWriteName(handle, "I2C_NUM_BYTES_RX", 0) # Set the number of bytes to receive
# Set the TX bytes. We are sending 1 byte for the address.
num = 127
if len(sys.argv) > 1:
    num = int(sys.argv[1])
aNames = ["I2C_DATA_TX"]
aWrites = [ljm.constants.WRITE] # Indicates we are writing the values.
aNumValues = [1]
aValues = [num] 
ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
print("\nWriting User Memory [0] = %s" % " ".join([("%.0f"%val) for val in aValues]))
ljm.eWriteName(handle, "I2C_GO", 1) # Do the I2C communications.
ack = ljm.eReadName(handle, "I2C_ACKS")
print("Write acks is " + str(int(ack)) )
# Read the RX bytes.
ljm.eWriteName(handle, "I2C_NUM_BYTES_TX", 0) # Set the number of bytes to transmit
ljm.eWriteName(handle, "I2C_NUM_BYTES_RX", 1) # Set the number of bytes to receive
ljm.eWriteName(handle, "I2C_GO", 1) # Do the I2C communications.
aNames = ["I2C_DATA_RX"]
aWrites = [ljm.constants.READ] # Indicates we are reading the values.
aNumValues = [1] # The number of bytes
aValues = [0]
aValues = ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
print("\nRead User Memory [0] = %s" % " ".join([("%.0f"%val) for val in aValues]))
ack = ljm.eReadName(handle, "I2C_ACKS")
print("Read acks is " + str(int(ack)) )
ljm.close(handle)