Created
September 11, 2024 15:24
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| import spcm | |
| import math | |
| from spcm import units | |
| import numpy as np | |
| size = 100 | |
| f0 = np.linspace(85.0e6, 121.0e6, size) | |
| f1 = np.linspace(84.5e6, 120.5e6, size) | |
| x, y = np.meshgrid(f0, f1) | |
| freqs = np.vstack([x.ravel(), y.ravel()]).T | |
| card: spcm.Card | |
| with spcm.Card("/dev/spcm1") as card: | |
| card.card_mode(spcm.SPC_REP_STD_DDS) | |
| channels = spcm.Channels(card) | |
| channels.enable(True) | |
| channels.amp(2.0 * units.V) | |
| card.write_setup() | |
| dds = spcm.DDSCommandQueue(card, channels=channels) | |
| dds.reset() | |
| dds.data_transfer_mode(spcm.SPCM_DDS_DTM_DMA) | |
| dds.cores_on_channel(1, spcm.SPCM_DDS_CORE20) | |
| card.start(spcm.M2CMD_CARD_ENABLETRIGGER) | |
| dds.trg_src(spcm.SPCM_DDS_TRG_SRC_TIMER) | |
| dds.trg_timer(0.01) | |
| frac = 0.4 | |
| dds.amp(0, frac) | |
| dds.freq(0, f0.mean()) | |
| dds.amp(20, frac) | |
| dds.freq(20, f1.mean()) | |
| dds.exec_at_trg() | |
| dds.write_to_card() | |
| time_step = 1e-5 | |
| dds.trg_timer(time_step) | |
| for i in range(math.floor(10 / time_step)): | |
| dds.freq(0, f0.mean()) | |
| dds.freq(20, f1.mean()) | |
| dds.exec_at_trg() | |
| dds.write_to_card() | |
| dds.mode = dds.WRITE_MODE.WAIT_IF_FULL | |
| card.cmd(spcm.M2CMD_CARD_FORCETRIGGER) | |
| print("Card triggered") | |
| print("Streaming... stop by pressing Ctrl+C") | |
| try: | |
| while True: | |
| for (f0, f1) in freqs: | |
| dds.freq(0, f0) | |
| dds.freq(20, f1) | |
| dds.exec_at_trg() | |
| if dds.status() & spcm.SPCM_DDS_STAT_QUEUE_UNDERRUN: | |
| break | |
| print("ERROR: Buffer underrun") | |
| except KeyboardInterrupt: | |
| print("Ctrl+C pressed: streaming stopped by user") |
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