def eNamesIteration(handle, numFrames, names, aWrites, aNumValues, aValues,
results):
# Function for timit.Timer. Performs a eNames call to do LabJack operations.
# Takes eNames parameters and a list for results which will be filled.
del results[:]
r = ljm.eNames(handle, numFrames, names, aWrites, aNumValues, aValues)
results.extend(r)
def eNamesIteration(handle, numFrames, names, aWrites, aNumValues, aValues,
results):
# Function for timit.Timer. Performs a eNames call to do LabJack operations.
# Takes eNames parameters and a list for results which will be filled.
del results[:]
r = ljm.eNames(handle, numFrames, names, aWrites, aNumValues, aValues)
results.extend(r)
def get_data(self):
a_values = [0] * LEN_VALS
a_values = ljm.eNames(self.lj_handle, NUM_FRAMES, A_NAMES, A_WRITES,
A_NUM_VALS, a_values)
self.monitor_points['ant_el'] = convert_encoder(a_values[0])
self.monitor_points['foc_temp'] = 50 * a_values[1] - 25
self.monitor_points['lna_a_current'] = 100 * a_values[2]
self.monitor_points['rf_a_power'] = 28.571 * a_values[3] - 90
self.monitor_points['laser_a_voltage'] = a_values[4]
self.monitor_points['feb_a_current'] = 1000 * a_values[5]
self.monitor_points['feb_a_temp'] = 50 * a_values[6] - 25
self.monitor_points['lna_b_current'] = 1000 * a_values[7]
self.monitor_points['rf_b_power'] = 28.571 * a_values[8] - 90
self.monitor_points['laser_b_voltage'] = a_values[9]
self.monitor_points['feb_b_current'] = 100 * a_values[10]
self.monitor_points['feb_b_temp'] = 50 * a_values[11] - 25
self.monitor_points['psu_voltage'] = a_values[12]
self.monitor_points['lj_temp'] = a_values[14] - ABSOLUTE_ZERO
dig_val = int(a_values[15])
self.monitor_points['drive_state'] = (dig_val >> 8) & 0b11
self.monitor_points['nd1'] = ~(dig_val >> 20) & 0b01
self.monitor_points['nd2'] = ~(dig_val >> 21) & 0b01
self.monitor_points['brake'] = (dig_val >> 16) & 0b01
self.monitor_points['plus_limit'] = (dig_val >> 17) & 0b01
self.monitor_points['minus_limit'] = (dig_val >> 18) & 0b01
self.monitor_points['fan_err'] = (dig_val >> 22) & 0b01
ts = float("{:.6f}".format(Time.now().mjd))
self.mp_q.post((ts, "ant{}".format(self.ant_num), self.monitor_points))
return self.monitor_points
def _get_data(self):
"""Read data from LJ T7 and insert into monitor point dictionary.
Values are read from the current LabJack T7 in a single operation through the ljm driver.
These are converted into the appropriate data types in the relevant units and put in the
one-second cadence monitor point dictionary.
"""
a_values = [0] * self.LEN_VALS
a_values = ljm.eNames(self.lj_handle, self.NUM_FRAMES, self.A_NAMES,
self.A_WRITES, self.A_NUM_VALS, a_values)
time_stamp = float("{:.8f}".format(Time.now().mjd))
self.monitor_points['time'] = float(time_stamp)
self.monitor_points['ant_el'] = a_values[17]
self.monitor_points['ant_cmd_el'] = a_values[16]
self.monitor_points['ant_el_err'] = a_values[18]
self.monitor_points['focus_temp'] = 100 * a_values[0] - 50
self.monitor_points['motor_temp'] = 100 * a_values[1] - 50
self.monitor_points['laser_volts_a'] = a_values[2]
self.monitor_points['rf_pwr_a'] = 28.571 * a_values[3] - 90
self.monitor_points['feb_current_a'] = 1000 * a_values[4]
self.monitor_points['lna_current_a'] = 100 * a_values[5]
self.monitor_points['feb_temp_a'] = 100 * a_values[6] - 50
self.monitor_points['lna_current_b'] = 100 * a_values[7]
self.monitor_points['rf_pwr_b'] = 28.571 * a_values[8] - 90
self.monitor_points['laser_volts_b'] = a_values[9]
self.monitor_points['feb_current_b'] = 0.1000 * a_values[10]
self.monitor_points['feb_temp_b'] = 100 * a_values[11] - 50
self.monitor_points['psu_volt'] = a_values[12]
self.monitor_points['spare'] = a_values[13]
self.monitor_points['lj_temp'] = a_values[14] - self.ABSOLUTE_ZERO
dig_val = int(a_values[15])
self.monitor_points['emergency_off'] = bool((dig_val >> 8) & 0b01)
self.monitor_points['drive_cmd'] = (dig_val >> 9) & 0b11
self.monitor_points['drive_act'] = (dig_val >> 14) & 0b11
self.monitor_points['drive_state'] = int(a_values[20])
self.monitor_points['brake_on'] = 1 - bool(((dig_val >> 13) & 0b01))
self.monitor_points['at_north_lim'] = bool(1 -
((dig_val >> 20) & 0b01))
self.monitor_points['at_south_lim'] = bool(1 -
((dig_val >> 21) & 0b01))
self.monitor_points['fan_err'] = bool((dig_val >> 22) & 0b01)
self.monitor_points['noise_a_on'] = bool(1 - ((dig_val >> 11) & 0b01))
self.monitor_points['noise_b_on'] = bool(1 - ((dig_val >> 12) & 0b01))
return self.monitor_points
UINT16 = ljm.constants.UINT16
UINT32 = ljm.constants.UINT32
# Setup and call eNames to write/read values to/from the LabJack.
# Write 2.5V to DAC0,
# write 12345 to TEST_UINT16,
# read TEST_UINT16,
# read serial number,
# read product ID,
# and read firmware version.
numFrames = 6
aNames = [
'DAC0', 'TEST_UINT16', 'TEST_UINT16', 'SERIAL_NUMBER', 'PRODUCT_ID',
'FIRMWARE_VERSION'
]
aWrites = [WRITE, WRITE, READ, READ, READ, READ]
aNumValues = [1, 1, 1, 1, 1, 1]
aValues = [2.5, 12345, 0, 0, 0, 0]
results = ljm.eNames(handle, numFrames, aNames, aWrites, aNumValues, aValues)
print("\neNames results: ")
start = 0
for i in range(numFrames):
end = start + aNumValues[i]
print(" Name - %16s, write - %i, values %s" %
(aNames[i], aWrites[i], results[start:end]))
start = end
# Close handle
ljm.close(handle)
ljm.eWriteName(handle, "I2C_SLAVE_ADDRESS",
80) # Slave Address of the I2C chip = 80 (0x50)
# Initial read of EEPROM bytes 0-3 in the user memory area. We need a single I2C
# transmission that writes the chip's memory pointer and then reads the data.
ljm.eWriteName(handle, "I2C_NUM_BYTES_TX",
1) # Set the number of bytes to transmit
ljm.eWriteName(handle, "I2C_NUM_BYTES_RX",
4) # Set the number of bytes to receive
# Set the TX bytes. We are sending 1 byte for the address.
aNames = ["I2C_DATA_TX"]
aWrites = [ljm.constants.WRITE] # Indicates we are writing the values.
aNumValues = [1] # The number of bytes
aValues = [0] # Byte 0: Memory pointer = 0
ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
ljm.eWriteName(handle, "I2C_GO", 1) # Do the I2C communications.
# Read the RX bytes.
aNames = ["I2C_DATA_RX"]
aWrites = [ljm.constants.READ] # Indicates we are reading the values.
aNumValues = [4] # The number of bytes
# aValues[0] to aValues[3] will contain the data
aValues = [0] * 4
aValues = ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
print("\nRead User Memory [0-3] = %s" % \
" ".join([("%.0f"%val) for val in aValues]))
# Write EEPROM bytes 0-3 in the user memory area, using the page write
ljm.eWriteName(handle, "I2C_OPTIONS", 0) # Options = 0
ljm.eWriteName(handle, "I2C_SLAVE_ADDRESS", 80) # Slave Address of the I2C chip = 80 (0x50)
# Initial read of EEPROM bytes 0-3 in the user memory area. We need a single I2C
# transmission that writes the chip's memory pointer and then reads the data.
ljm.eWriteName(handle, "I2C_NUM_BYTES_TX", 1) # Set the number of bytes to transmit
ljm.eWriteName(handle, "I2C_NUM_BYTES_RX", 4) # Set the number of bytes to receive
# Set the TX bytes. We are sending 1 byte for the address.
aNames = ["I2C_DATA_TX"]
aWrites = [ljm.constants.WRITE] # Indicates we are writing the values.
aNumValues = [1] # The number of bytes
aValues = [0] # Byte 0: Memory pointer = 0
ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
ljm.eWriteName(handle, "I2C_GO", 1) # Do the I2C communications.
# Read the RX bytes.
aNames = ["I2C_DATA_RX"]
aWrites = [ljm.constants.READ] # Indicates we are reading the values.
aNumValues = [4] # The number of bytes
# aValues[0] to aValues[3] will contain the data
aValues = [0]*4
aValues = ljm.eNames(handle, len(aNames), aNames, aWrites, aNumValues, aValues)
print("\nRead User Memory [0-3] = %s" % \
" ".join([("%.0f"%val) for val in aValues]))
from labjack import ljm
# Open first found LabJack
handle = ljm.open(ljm.constants.dtANY, ljm.constants.ctANY, "ANY")
#handle = ljm.openS("ANY", "ANY", "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]))
# Setup and call eNames to write/read values to/from the LabJack.
numFrames = 3
names = ["DAC0", "TEST_UINT16", "TEST_UINT16"]
aWrites = [ljm.constants.WRITE, ljm.constants.WRITE, ljm.constants.READ]
aNumValues = [1, 1, 1]
aValues = [2.5, 12345, 0] # [write 2.5 V, write 12345, read]
results = ljm.eNames(handle, numFrames, names, aWrites, aNumValues, aValues)
print("\neNames results: ")
start = 0
for i in range(numFrames):
end = start + aNumValues[i]
print(" Name - %s, write - %i, values %s" % \
(names[i], aWrites[i], results[start:end]))
start = end
# Close handle
ljm.close(handle)
for i in range(numFrames):
print(" %s = %0.0f" % (aNames[i], aValues[i]))
# Write(TX)/Read(RX) 4 bytes
numBytes = 4;
ljm.eWriteName(handle, "SPI_NUM_BYTES", numBytes)
# Write the bytes
dataWrite = []
dataWrite.extend([randrange(0, 256) for _ in range(numBytes)])
aNames = ["SPI_DATA_TX"]
aWrites = [ljm.constants.WRITE]
aNumValues = [numBytes];
dataWrite = ljm.eNames(handle, 1, aNames, aWrites, aNumValues, dataWrite)
ljm.eWriteName(handle, "SPI_GO", 1) # Do the SPI communications
# Display the bytes written
print("");
for i in range(numBytes):
print("dataWrite[%i] = %0.0f" % (i, dataWrite[i]))
# Read the bytes
dataRead = [0]*numBytes
aNames = ["SPI_DATA_RX"]
aWrites = [ljm.constants.READ]
aNumValues = [numBytes];
dataRead = ljm.eNames(handle, 1, aNames, aWrites, aNumValues, dataRead)
print("SPI Configuration:")
for i in range(numFrames):
print(" %s = %0.0f" % (aNames[i], aValues[i]))
# Write(TX)/Read(RX) 4 bytes
numBytes = 4
ljm.eWriteName(handle, "SPI_NUM_BYTES", numBytes)
# Write the bytes
dataWrite = []
dataWrite.extend([randrange(0, 256) for _ in range(numBytes)])
aNames = ["SPI_DATA_TX"]
aWrites = [ljm.constants.WRITE]
aNumValues = [numBytes]
dataWrite = ljm.eNames(handle, 1, aNames, aWrites, aNumValues, dataWrite)
ljm.eWriteName(handle, "SPI_GO", 1) # Do the SPI communications
# Display the bytes written
print("")
for i in range(numBytes):
print("dataWrite[%i] = %0.0f" % (i, dataWrite[i]))
# Read the bytes
dataRead = [0] * numBytes
aNames = ["SPI_DATA_RX"]
aWrites = [ljm.constants.READ]
aNumValues = [numBytes]
dataRead = ljm.eNames(handle, 1, aNames, aWrites, aNumValues, dataRead)
ljm.eWriteName(handle, "SPI_GO", 1)
