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example: python: Changed setting frequency to use time commands

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Modified example to support demonstratig the X440 phase repeatability
performance when using dram feature. Change is compatible with all supported
rfnoc devices that utilize the RFNoC Replay Block, but only improves
phase repeatability performance of X440.

Separated loops configuring radio properties and converted setting carrier
frequency into timed commands. This required moving this code to a later
part in the programming flow, after all the clock source settings are
applied and the LO locks are confirmed.
This commit is contained in:
Marian Koop 2024-05-21 17:36:08 +02:00 committed by Joerg Hofrichter
parent de1542331f
commit aedb8ac79f
1 changed files with 14 additions and 1 deletions
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15
host/examples/python/tx_waveforms.py
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@ -77,14 +77,27 @@ def rfnoc_dram_tx(args):
dram = dram_utils.DramTransmitter(graph, radio_chans, cpu_format='fc32')
replay = dram.replay_blocks[0]
print(f"Using replay block: {replay.get_unique_id()}")
# Separate loops for setting rate and frequency to minimize timed cmd queue
for (radio, radio_chan), duc_info in zip(dram.radio_chan_pairs, dram.duc_chan_pairs):
radio.set_tx_frequency(args.freq, radio_chan)
radio.set_tx_gain(args.gain, radio_chan)
if duc_info:
duc, duc_chan = duc_info
duc.set_output_rate(args.rate, duc_chan)
else:
radio.set_rate(args.rate)
# Use timed commands to set frequency to minimize phase differences
# between channels.
cmd_time_offset = 0.1
cmd_time = dram.radio_chan_pairs[0][0].get_time_now() + cmd_time_offset
for (radio, radio_chan) in dram.radio_chan_pairs:
radio.set_command_time(cmd_time, radio_chan)
radio.set_tx_frequency(args.freq, radio_chan)
for (radio, radio_chan) in dram.radio_chan_pairs:
radio.clear_command_time(radio_chan)
# Enough time for tune time to expire
time.sleep(cmd_time_offset)
# Overwrite default memory regions to maximize available memory
mem_regions = [(0, replay.get_mem_size()) for _ in args.channels]
dram.mem_regions = mem_regions