From c2b44c0585d1f2a2a435b5c5931c866e9e1ea1b8 Mon Sep 17 00:00:00 2001 From: Adrian Stanea Date: Fri, 13 Oct 2023 14:31:04 +0300 Subject: [PATCH] bindings/csharp: pluto example - How to use C# bindings to control libiio devices. - Configure Pluto and use RX and TX interfaces to send and receive data. - Nice to have for EZ questions such as: https://ez.analog.com/adieducation/university-program/f/q-a/574101/adalam-pluto-sdr-via-c Signed-off-by: Adrian Stanea --- bindings/csharp/examples/PlutoExample.cs | 146 +++++++++++++++++++++++ 1 file changed, 146 insertions(+) create mode 100644 bindings/csharp/examples/PlutoExample.cs diff --git a/bindings/csharp/examples/PlutoExample.cs b/bindings/csharp/examples/PlutoExample.cs new file mode 100644 index 000000000..a20fe8820 --- /dev/null +++ b/bindings/csharp/examples/PlutoExample.cs @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * libiio - Library for interfacing industrial I/O (IIO) devices + * + * Copyright (C) 2023 Analog Devices, Inc. + * Author: Adrian Stanea + */ + +using System; +using System.Reflection; +using iio; + +[assembly: AssemblyTitle("Pluto_Example")] +[assembly: AssemblyVersion("1.0.0.0")] +[assembly: System.Runtime.InteropServices.ComVisible(false)] +[assembly: CLSCompliant(true)] +namespace IIOCSharp +{ + static class PlutoExample + { + const int INT16_BYTE_STEP = 2; + const string URI = "ip:pluto.local"; + const double TXLO = 1_000_000_000; + const double TXBW = 5_000_000; + const double TXFS = 3_000_000; + const double RXLO = TXLO; + const double RXBW = TXBW; + const double RXFS = TXFS; + const string GAIN_CTRL_MODE = "slow_attack"; + const double HW_GAIN = -30; + + const string CHN_VOLTAGE0 = "voltage0"; + const string CHN_VOLTAGE1 = "voltage1"; + + static void Main(string[] args) + { + Context ctx = new Context(URI); + if (ctx == null) + { + Console.WriteLine("Unable to create IIO context"); + return; + } + // get reference to devices + var ctrl = ctx.find_device("ad9361-phy"); + var tx_dac = ctx.find_device("cf-ad9361-dds-core-lpc"); + var rx_adc = ctx.find_device("cf-ad9361-lpc"); + + rx_config(ctrl, RXLO, RXBW, RXFS, GAIN_CTRL_MODE); + tx_config(ctrl, TXLO, TXBW, TXFS, HW_GAIN); + + // Enable all IQ channels + enable_tx(tx_dac); + enable_rx(rx_adc); + + // Cyclic buffer to output perdiodic waveforms + uint samples_per_channel = Convert.ToUInt16(Math.Pow(2, 15)); + + var tx_buf = new IOBuffer(tx_dac, samples_per_channel, true); + var rx_buff = new IOBuffer(rx_adc, samples_per_channel, false); + + byte[] iqBytes = generate_sine(Convert.ToInt32(samples_per_channel), RXFS); + + // Send data to TX buffer + tx_buf.fill(iqBytes); + tx_buf.push(); + + // read data on rx buffer + const int num_readings = 10; + (List reals, List imags) = read_rx_data(rx_buff, num_readings, Convert.ToInt32(samples_per_channel)); + } + + static void rx_config(Device device, double rx_lo, double rx_bw, double rx_fs, string gain_ctrl_mode) + { + var rx_chn = device.find_channel(CHN_VOLTAGE0, false); + + device.find_channel("RX_LO", true).find_attribute("frequency").write(rx_lo); + rx_chn.find_attribute("rf_bandwidth").write(rx_bw); + rx_chn.find_attribute("sampling_frequency").write(rx_fs); + rx_chn.find_attribute("gain_control_mode").write(gain_ctrl_mode); + } + + static void tx_config(Device device, double tx_lo, double tx_bw, double tx_fs, double hw_gain) + { + var tx_chn = device.find_channel(CHN_VOLTAGE0, true); + + device.find_channel("TX_LO", true).find_attribute("frequency").write(tx_lo); + tx_chn.find_attribute("rf_bandwidth").write(tx_bw); + tx_chn.find_attribute("sampling_frequency").write(tx_fs); + tx_chn.find_attribute("hardwaregain").write(hw_gain); + } + + static void enable_tx(Device tx_adc) + { + tx_adc.find_channel(CHN_VOLTAGE0, true).enable(); + tx_adc.find_channel(CHN_VOLTAGE1, true).enable(); + } + + static void enable_rx(Device rx_dac) + { + rx_dac.find_channel(CHN_VOLTAGE0, false).enable(); + rx_dac.find_channel(CHN_VOLTAGE1, false).enable(); + } + + static byte[] generate_sine(int samples_per_channel, double rx_fs) + { + const int fc = 10000; + double ts = 1.0 / rx_fs; + double[] t = Enumerable.Range(0, samples_per_channel).Select(i => i * ts).ToArray(); + + double[] i = t.Select(x => (Math.Sin(2 * Math.PI * x * fc) * Math.Pow(2, 14))).ToArray(); + double[] q = t.Select(x => (Math.Cos(2 * Math.PI * x * fc) * Math.Pow(2, 14))).ToArray(); + + Int16[] iq = new Int16[i.Length + q.Length]; + for (int j = 0; j < i.Length; j++) + { + iq[j * INT16_BYTE_STEP] = Convert.ToInt16(i[j]); + iq[j * INT16_BYTE_STEP + 1] = Convert.ToInt16(q[j]); + } + + byte[] iqBytes = iq.SelectMany(BitConverter.GetBytes).ToArray(); + return iqBytes; + } + + static (List reals, List imags) read_rx_data(IOBuffer rx_buff, int num_readings, int samples_per_channel) + { + List reals = new List(); + List imags = new List(); + + byte[] data = new byte[samples_per_channel]; + for (int k = 0; k < num_readings; k++) + { + rx_buff.refill(); + rx_buff.read(data); + + Int16[] data_casted = new Int16[data.Length / INT16_BYTE_STEP]; + Buffer.BlockCopy(data, 0, data_casted, 0, data.Length); + for (int idx = 0; idx < data_casted.Length; idx += INT16_BYTE_STEP) + { + reals.Add(data_casted[idx]); + imags.Add(data_casted[idx + 1]); + } + } + return (reals, imags); + } + } +}