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# This demo shows how to use tranceiver hardware on VESNA nodes for signal
# generation. A simple signal generation interface is exposed through ALH
# resources. Code below uses convenience objects from the
# vesna.alh.signalgenerator module to access them.
import logging
import time
from vesna import alh
from vesna.alh.signalgenerator import SignalGenerator, SignalGeneratorProgram
def main():
# Turn on logging so that we can see ALH requests happening in the
# background.
coor = alh.ALHWeb("", 10001)
# Node 16 is equipped with an 2.4 GHz tranceiver (CC2500 on
# SNE-ISMTV-24) that is capable of transmitting on the 2.4 GHz ISM
# band.
node = alh.ALHProxy(coor, 16)
# We the ALHProxy object with a SignalGenerator object that provides an
# convenient interface to the signal generation functionality.
generator = SignalGenerator(node)
# Get a ConfigList object that contains a list of device configurations
# supported by the chosen transmitter node.
config_list = generator.get_config_list()
# ConfigList.get_tx_config() method will automatically choose
# a device and hardware configuration that can be used to transmit on
# the requested frequency. It returns an instance of TxConfig class
# that describes all settings for signal generation.
# We request a transmission at 2.425 GHz with 0 dBm.
tx_config = config_list.get_tx_config(2425e6, 0)
if tx_config is None:
raise Exception("Node can not transmit at the specified frequency and/or power.")
# SignalGeneratorProgram object joins the transmit config with timing
# information. Here we specify that we want to start the transmission 5
# seconds from now and that the transmission should be 30 seconds long.
now = time.time()
program = SignalGeneratorProgram(tx_config, now + 5, 30)