hutcheb commented on a change in pull request #191:
URL: https://github.com/apache/plc4x/pull/191#discussion_r494920825
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File path:
plc4j/drivers/knxnetip/src/main/java/org/apache/plc4x/java/knxnetip/utils/KnxHelper.java
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@@ -46,9 +46,16 @@ public static void f16toBytes(WriteBuffer io, Object param) {
boolean negative = value < 0;
final int exponent = Math.getExponent(value);
final double mantissa = value / Math.pow(2, exponent);
+ //io.writeBit(negative);
+ //io.writeInt(4, exponent);
+ //io.writeDouble(11, Math.getExponent(mantissa), mantissa);
//Don't think this works BH
+
+ String mantissaString = Double.toString(mantissa);
+ int mantissaInteger =
Integer.parseInt(mantissaString.substring(mantissaString.indexOf('.')));
Review comment:
The string conversion is to get the digits after the decimal place of
the mantissa as part of writing a 16-bit float.
(In my head the mantissa is always going to have a one before the decimal
place which can be discarded)
The digits after are then converted to an integer to be written as the
manitssa part.
I haven't tested this part of it, it has a slight chance of working for most
cases but not all. I'll create a 16-bit floating point PlcValue at some point
and test it with Modbus and then move it over to the KNX protocol as a custom
PlcValue.
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