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refactor(PLCHelpers): Extract WriteSzlRequestHeader

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This commit is contained in:
Michael Croes
2023-08-29 20:41:55 +02:00
parent 5e1ac8c7bf
commit eada47cd24
1 changed files with 15 additions and 8 deletions
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23
S7.Net/PLCHelpers.cs
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@@ -56,15 +56,13 @@ namespace S7.Net
WriteS7Header(stream, s7MessageTypeUserData, parameterLength, dataLength); WriteS7Header(stream, s7MessageTypeUserData, parameterLength, dataLength);
} }
private static void WriteSzlReadRequest(System.IO.MemoryStream stream, ushort szlId, ushort szlIndex) private static void WriteSzlRequestHeader(System.IO.MemoryStream stream, byte functionGroup, byte subFunction, int dataLength)
{ {
WriteUserDataHeader(stream, 8, 8); WriteUserDataHeader(stream, 8, dataLength);
// Parameter // Parameter
const byte szlMethodRequest = 0x11; const byte szlMethodRequest = 0x11;
const byte szlTypeRequest = 0b100; const byte szlTypeRequest = 0x4;
const byte szlFunctionGroupCpuFunctions = 0b100;
const byte subFunctionReadSzl = 0x01;
// Parameter head // Parameter head
stream.Write(new byte[] { 0x00, 0x01, 0x12 }); stream.Write(new byte[] { 0x00, 0x01, 0x12 });
@@ -73,11 +71,20 @@ namespace S7.Net
// Method // Method
stream.WriteByte(szlMethodRequest); stream.WriteByte(szlMethodRequest);
// Type / function group // Type / function group
stream.WriteByte(szlTypeRequest << 4 | szlFunctionGroupCpuFunctions); stream.WriteByte((byte)(szlTypeRequest << 4 | (functionGroup & 0x0f)));
// Subfunction // Subfunction
stream.WriteByte(subFunctionReadSzl); stream.WriteByte(subFunction);
// Sequence number // Sequence number
stream.WriteByte(0); stream.WriteByte(0);
}
private static void WriteSzlReadRequest(System.IO.MemoryStream stream, ushort szlId, ushort szlIndex)
{
// Parameter
const byte szlFunctionGroupCpuFunctions = 0b100;
const byte subFunctionReadSzl = 0x01;
WriteSzlRequestHeader(stream, szlFunctionGroupCpuFunctions, subFunctionReadSzl, 8);
// Data // Data
const byte success = 0xff; const byte success = 0xff;
@@ -343,7 +350,7 @@ namespace S7.Net
private static byte[] BuildSzlReadRequestPackage(ushort szlId, ushort szlIndex) private static byte[] BuildSzlReadRequestPackage(ushort szlId, ushort szlIndex)
{ {
var stream = new System.IO.MemoryStream(); var stream = new System.IO.MemoryStream();
WriteSzlReadRequest(stream, szlId, szlIndex); WriteSzlReadRequest(stream, szlId, szlIndex);
stream.SetLength(stream.Position); stream.SetLength(stream.Position);