logicanalyzer/Software/LogicAnalyzer/SerialProtocolAnalyzer/SerialAnalyzer.cs

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C#
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2023-02-01 18:57:37 +00:00
using Avalonia.Controls;
using Avalonia.Media;
using LogicAnalyzer.Protocols;
using System.Text;
namespace SerialProtocolAnalyzer
{
public class SerialAnalyzer : ProtocolAnalyzerBase
{
private SimpleSegmentRenderer renderer = new SimpleSegmentRenderer();
static ProtocolAnalyzerSetting[] settings = new ProtocolAnalyzerSetting[]
{
new ProtocolAnalyzerSetting
{
Caption = "Polarity",
SettingType = ProtocolAnalyzerSetting.ProtocolAnalyzerSettingType.List,
ListValues = new string[] { "Positive (TTL)", "Negative (RS232)" }
},
new ProtocolAnalyzerSetting
{
Caption = "Data bits",
SettingType = ProtocolAnalyzerSetting.ProtocolAnalyzerSettingType.List,
ListValues = new string[] { "8", "7" }
},
new ProtocolAnalyzerSetting
{
Caption = "Parity",
SettingType = ProtocolAnalyzerSetting.ProtocolAnalyzerSettingType.List,
ListValues = new string[] { "None", "Even", "Odd" }
},
new ProtocolAnalyzerSetting
{
Caption = "Stop bits",
SettingType = ProtocolAnalyzerSetting.ProtocolAnalyzerSettingType.List,
ListValues = new string[] { "1", "1.5", "2" }
},
new ProtocolAnalyzerSetting
{
Caption = "Bauds",
SettingType = ProtocolAnalyzerSetting.ProtocolAnalyzerSettingType.Integer,
IntegerMinimumValue= 200,
IntegerMaximumValue= 20000000,
}
};
static ProtocolAnalyzerSignal[] signals = new ProtocolAnalyzerSignal[]
{
new ProtocolAnalyzerSignal{ SignalName = "RX", Required = false },
new ProtocolAnalyzerSignal{ SignalName = "TX", Required = false },
};
public override string ProtocolName
{
get
{
return "Serial";
}
}
public override ProtocolAnalyzerSetting[] Settings
{
get
{
return settings;
}
}
public override ProtocolAnalyzerSignal[] Signals
{
get
{
return signals;
}
}
public override ProtocolAnalyzedChannel[] Analyze(int SamplingRate, int TriggerSample, ProtocolAnalyzerSettingValue[] SelectedSettings, ProtocolAnalyzerSelectedChannel[] SelectedChannels)
{
double period = (double)SamplingRate / (double)(int)SelectedSettings[4].Value;
if (period < 1)
return new ProtocolAnalyzedChannel[0];
int zero = SelectedSettings[0].Value.ToString() == settings[0].ListValues[0] ? 0 : 1;
int dataBits = int.Parse(SelectedSettings[1].Value.ToString());
string parity = SelectedSettings[2].Value.ToString();
double stopBits = double.Parse(SelectedSettings[3].Value.ToString());
List<ProtocolAnalyzedChannel> analyzed = new List<ProtocolAnalyzedChannel>();
foreach(var channel in SelectedChannels)
analyzed.Add(AnalyzeSerialData(dataBits, parity, stopBits, period, zero, channel));
return analyzed.ToArray();
}
private ProtocolAnalyzedChannel AnalyzeSerialData(int dataBits, string? parity, double stopBits, double period, int zero, ProtocolAnalyzerSelectedChannel channel)
{
List<ProtocolAnalyzerDataSegment> segments = new List<ProtocolAnalyzerDataSegment>();
int pos = 0;
//Minimum samples needed for a byte, we skip the parity bits for the chance of getting a byte at the end
//of the samples
int samplesPerByte = (int)Math.Ceiling(period * (dataBits + (parity == "None" ? 0 : 1)));
while (pos < channel.Samples.Length)
{
//Find idle
while (pos < channel.Samples.Length && channel.Samples[pos] == zero)
pos++;
//Find start condition
while (pos < channel.Samples.Length && channel.Samples[pos] != zero)
pos++;
//Not found? abort
if (pos >= channel.Samples.Length)
break;
byte value = 0;
byte val = 0;
bool parityError = false;
bool frameError = false;
int oneCount = 0;
int startPos = pos;
//If there are not enough bits for a byte end the loop
if (pos + samplesPerByte >= channel.Samples.Length)
break;
//Position our sampling "pointer" on the middle of the start bit
double samplePos = pos + (period / 2) - 1; //
for (int buc = 0; buc < dataBits; buc++)
{
samplePos += period;
val = channel.Samples[(int)Math.Round(samplePos, 0)] == zero ? (byte)0 : (byte)1;
value |= (byte)(val << buc);
if (val == 1)
oneCount++;
}
if (parity != "None")
{
samplePos += period;
val = channel.Samples[(int)Math.Round(samplePos, 0)] == zero ? (byte)0 : (byte)1;
if (val == 1)
oneCount++;
if((parity == "Even" && oneCount % 2 != 0) || (parity == "Odd" && oneCount % 2 == 0))
parityError = true;
}
samplePos += period;
if (samplePos >= channel.Samples.Length)
break;
val = channel.Samples[(int)Math.Round(samplePos, 0)] == zero ? (byte)0 : (byte)1;
if(val != 1)
frameError = true;
if (stopBits != 1)
{
samplePos += stopBits == 2 ? period : period * 0.75f;
if (samplePos >= channel.Samples.Length)
break;
val = channel.Samples[(int)Math.Round(samplePos, 0)] == zero ? (byte)0 : (byte)1;
if (val != 1)
frameError = true;
}
int endPos = (int)Math.Round(samplePos, 0);
ProtocolAnalyzerDataSegment newSegment = new ProtocolAnalyzerDataSegment();
newSegment.Value = "0x" + value.ToString("X2") + "-'" + Encoding.ASCII.GetString(new byte[] { value }) + "'";
newSegment.FirstSample = startPos;
newSegment.LastSample = endPos;
string errors = "";
if (parityError)
errors += "P";
if(frameError)
errors += "F";
if (errors != "")
newSegment.Value += " <" + errors + ">";
segments.Add(newSegment);
pos = endPos;
}
ProtocolAnalyzedChannel aChannel = new ProtocolAnalyzedChannel(channel.SignalName, channel.ChannelIndex, renderer, segments.ToArray(), Colors.White, channel.SignalName == "TX" ? Color.FromUInt32(0x7f006400) : Color.FromUInt32(0x7f8b0000));
return aChannel;
}
public override bool ValidateSettings(ProtocolAnalyzerSettingValue[] SelectedSettings, ProtocolAnalyzerSelectedChannel[] SelectedChannels)
{
if (SelectedSettings == null || SelectedSettings.Length == 0)
return false;
if (SelectedChannels == null || SelectedChannels.Length == 0)
return false;
foreach (var setting in SelectedSettings)
if (setting.Value == null)
return false;
return true;
}
}
}