MHD Logging

MHD's logger has a useful feature which allows you to add custom logging parameters, which we explain below.

You use this feature, you need the a2l file for your DME (see Resources for getting started).

The basic process is as follows

• Create a <prg>_UserChannels.xml file where <prg> is the value of Current PRG (hex) as shown by MHD flasher when you list the DME software versions.
• The file follows a format as follows

<?xml version="1.0" standalone="yes"?> <ActualValues> <ActualValue

 ReqBlock="$measurement-hex-address-according-to-a2l" 
 Size="$size-in-bytes" 
 DataA="$x-coefficient" 
 DataB="$constant" 
 Prefix="$memory-segment-leading-digits-unused" 
 Units="$units" 
 RoundingDigits="$decimal-places" 
 signed="$1-if-signed-otherwise-skip-this-attribute">

</ActualValues>

Here's an example for Dzwt_pf1, the temperature correction component of an overall timing correction:

<ActualValue ReqBlock="51801f14" Size="2" DataA="0.1" DataB="0.0" Prefix="51" Units="°" RoundingDigits="1" signed="1"> <Text xml:lang="en">Dzwt_pf1</Text> </ActualValue>

This is so because the a2l file declares:

/begin MEASUREMENT

Dzwt_pf1 "Temperaturkorrektur ZW-Klopfgrenze Pfad1" SWORD juwcFuc_Dtmczic_mCgfamd_q__aa0o 1 100. -3276.8 3276.7 FORMAT "%6.1" ECU_ADDRESS 0x51801F14

/end MEASUREMENT

and

/begin COMPU_METHOD

juwcFuc_Dtmczic_mCgfamd_q__aa0o "juwcFuc_Dtmczic_mCgfamd_q__aa0o" RAT_FUNC "%6.3" "°"

COEFFS 0. 10. 0. 0. 0. 1.

/end COMPU_METHOD