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bindings/csharp: pluto example
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- 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 <[email protected]>
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Adrian-Stanea committed Oct 16, 2023
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/*
* Copyright (C) 2023 Analog Devices, Inc.
* Author: Adrian Stanea <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* */

using System;
using System.Globalization;
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:192.168.2.1";
const string TXLO = "1000000000";
const string TXBW = "5000000";
const string TXFS = "3000000";
const string RXLO = TXLO;
const string RXBW = TXBW;
const string RXFS = TXFS;
const string GAIN_CTRL_MODE = "slow_attack";
const string 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<int> reals, List<int> imags) = read_rx_data(rx_buff, num_readings, Convert.ToInt32(samples_per_channel));
}

static void rx_config(Device device, string rx_lo, string rx_bw, string 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, string tx_lo, string tx_bw, string tx_fs, string 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, string rx_fs)
{
const int fc = 10000;
double ts = 1.0 / int.Parse(rx_fs, CultureInfo.CurrentCulture);
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<int> reals, List<int> imags) read_rx_data(IOBuffer rx_buff, int num_readings, int samples_per_channel)
{
List<int> reals = new List<int>();
List<int> imags = new List<int>();

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);
}
}
}

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