public DtcParameterIdentification(
DiagnosticTroubleCode.CodeType codeType,
string name,
byte mode,
short pid,
byte dataByteCount,
string formulaString,
string units,
string group,
string pidType,
string description = "",
string header = "") :
base(name, mode, pid, dataByteCount, formulaString, units, group, pidType, description, header)
{
this.CodeType = codeType;
}
private List <DiagnosticTroubleCode> GetDtc(
Cable cable,
DtcParameterIdentification specialMode,
DiagnosticTroubleCode.CodeType codeType)
{
List <DiagnosticTroubleCode> codes = new List <DiagnosticTroubleCode>();
try
{
String dtcString = cable.Communicate(specialMode);
Diagnostics.DiagnosticLogger.Log("GetDtc: mode " + this.Mode + " received \"" + dtcString + "\"");
// possible there is no data so check
if (!string.IsNullOrEmpty(dtcString) && !dtcString.Contains(Protocols.Elm327.Responses.NoData))
{
String[] dataLines = ParameterIdentification.PrepareResponseString(dtcString);
if (dataLines != null && dataLines.Length > 0)
{
dataLines = prepMarkedLines(dataLines);
foreach (String line in dataLines)
{
byte[] dtcBytes = ParameterIdentification.ParseStringValues(line);
if (dtcBytes != null && dtcBytes.Length > 0)
{
// make sure the correct pid was received
if (dtcBytes[ParameterIdentification.ResponseByteOffsets.Mode] - 0x40 == specialMode.Mode)
{
byte[] dtcNumbers = dtcBytes.Skip(1).ToArray();
// check if the returned numbers are all zeros, some times the data is not valid
bool allZeros = true;
foreach (int b in dtcNumbers)
{
if (b != 0 && b != 0xAA)
{ // 0 for non-CAN vehicles, and 0xAA for CAN
allZeros = false;
break;
}
}
// check if the response is empty, some protocols will return data with all zeros
if (!allZeros)
{
// the CAN protocols use a byte for how many codes are received, ISO based protocols do not,
if (cable.Protocol == Protocols.Protocol.HighSpeedCAN11 ||
cable.Protocol == Protocols.Protocol.LowSpeedCAN11 ||
cable.Protocol == Protocols.Protocol.HighSpeedCAN29 ||
cable.Protocol == Protocols.Protocol.LowSpeedCAN29)
{
dtcNumbers = dtcNumbers.Skip(1).ToArray();
}
// each code should be two bytes, meaning we need an even number of bytes to parse correctly
// if (dtcNumbers.length % 2 == 0) {
{
for (int index = 0; index < dtcNumbers.Length - 1; index += 2)
{
// it is possible to have zero values padded out in the packet, check if this is the case
if (!(dtcNumbers[index] == 0 && dtcNumbers[index + 1] == 0) &&
!(dtcNumbers[index] == 0xAA && dtcNumbers[index + 1] == 0xAA))
{
string firstByte = dtcNumbers[index].ToString(Protocols.ToHexFormat);
string secondByte = dtcNumbers[index + 1].ToString(Protocols.ToHexFormat);
// the code is still in elm327 encoded format, e.g. "4670" which would be DTC B0670
String elm327code = firstByte + secondByte;
DiagnosticTroubleCode code = new DiagnosticTroubleCode(elm327code, codeType);
// see if the code exists in the list of known codes to get the description
Utilities.IniFileEntry entry = link.Globals.dtcs.Find(e => e.Key == code.Code);
if (entry != null)
{
code.Description = entry.Value;
}
// finally add the code to the list after the description was checked
Diagnostics.DiagnosticLogger.Log("GetDtc: finished decoding dtc " + code.Code);
codes.Add(code);
}
else
{
Diagnostics.DiagnosticLogger.Log("GetDtc: skipping zero values DTC");
}
}
}
if (dtcNumbers.Length % 2 != 0)
{
Diagnostics.DiagnosticLogger.Log("GetDtc: number of bytes to work with for dtc check is not an expected even number, got" + dtcNumbers.Length + " total bytes, ignoring last byte");
}
}
else
{
Diagnostics.DiagnosticLogger.Log("GetDtc: Received correct mode and valid DTC data, but it is all zeros, no DTC to report");
}
}
else
{
Diagnostics.DiagnosticLogger.Log("GetDtc: mode returned for DTC check is invalid, received " + (dtcBytes[ParameterIdentification.ResponseByteOffsets.Mode] - 0x40) + ", and expected " + specialMode.Mode);
}
}
else
{
Diagnostics.DiagnosticLogger.Log("GetDtc: dtcBytes is null or zero sized");
}
} // end for (String line : dataLines)
}
else
{
Diagnostics.DiagnosticLogger.Log("dataLines was null, nothing returned for mode " + this.Mode);
}
}
else
{
// maybe do something, most likely there are no codes and "NO DATA" was returned
Diagnostics.DiagnosticLogger.Log("GetDtc: it doesn't look like there are any trouble codes to be had");
}
}
catch (Exception ex)
{
Diagnostics.DiagnosticLogger.Log("GetDtc: could not get trouble codes due to exception:\n", ex);
}
return(codes);
}
