Example: PSU with background worker.

"""Example: PSU with background worker.

Demonstrates publishing measurements/commands to a dataset (Nominal Core publisher).

"""

import time

from nominal_instro.instruments import NominalPSU
from nominal_instro.lib import ConnectConfig
from nominal_instro.lib.publishers import NominalCorePublisher

VISA_RESOURCE = "TCPIP0::127.0.1::5025::SOCKET"
DATASET_RID = "<dataset_rid>" # Replace with your dataset RID. 

psu = NominalPSU.auto_create(
    name="myPSU",
    resource=ConnectConfig(visa_resource=VISA_RESOURCE),
    num_channels=2,
)
psu.add_publisher(NominalCorePublisher(dataset_rid=DATASET_RID))

psu.background_interval = 0.5  # query psu for new values every half second.
psu.open()

try:
    # This launches a background daemon that queries the measured voltage, current, and output state.
    psu.start()

    # Allow the daemon to publish some current-state measurements before reconfiguring the outputs.
    time.sleep(1)

    psu.set_current_limit(1.5, 1)
    psu.set_voltage(28, 1)
    psu.output_enable(True, 1)

    while True:
        try:
            # Main progam loop.
            # Sit in this while loop until ctrl+c is pressed.
            # NominalPSU will acquire data from the psu in the background and publish to the configured Publisher.
            voltage = psu.get_channel("myPSU.ch1_v", 1, True)
            print(voltage.latest)

        except KeyboardInterrupt:
            break

    print("Done")
    psu.output_enable(False, 1)

finally:
    psu.close()