Mac OSX Display DSPC Hex Decoder

dspcDecode.sh

#!/bin/bash

function hex2values {
    # https://opensource.apple.com/source/IOKitUser/IOKitUser-67/graphics.subproj/IOGraphicsLibPrivate.h
    clock=0x${1:0:4}
    horizActive=0x${1:4:2}
    horizBlanking=0x${1:6:2}
    horizHigh=0x${1:8:2}
    verticalActive=0x${1:10:2}
    verticalBlanking=0x${1:12:2}
    verticalHigh=0x${1:14:2}
    horizSyncOffset=0x${1:16:2}
    horizSyncWidth=0x${1:18:2}
    verticalSyncOffsetWidth=0x${1:20:2}
    syncHigh=0x${1:22:2}
    horizImageSize=0x${1:24:2}
    verticalImageSize=0x${1:26:2}
    imageSizeHigh=0x${1:28:2}
    horizBorder=0x${1:30:2}
    verticalBorder=0x${1:32:2}
    flags=0x${1:34:2}

    echo "clock - ${clock}"
    echo "horizActive - ${horizActive}"
    echo "horizBlanking - ${horizBlanking}"
    echo "horizHigh - ${horizHigh}"
    echo "verticalActive - ${verticalActive}"
    echo "verticalBlanking - ${verticalBlanking}"
    echo "verticalHigh - ${verticalHigh}"
    echo "horizSyncOffset - ${horizSyncOffset}"
    echo "horizSyncWidth - ${horizSyncWidth}"
    echo "verticalSyncOffsetWidth - ${verticalSyncOffsetWidth}"
    echo "syncHigh - ${syncHigh}"
    echo "horizImageSize - ${horizImageSize}"
    echo "verticalImageSize - ${verticalImageSize}"
    echo "imageSizeHigh - ${imageSizeHigh}"
    echo "horizBorder - ${horizBorder}"
    echo "verticalBorder - ${verticalBorder}"
    echo "flags - ${flags}"

    echo
    # https://opensource.apple.com/source/IOKitUser/IOKitUser-67/graphics.subproj/IODisplayLib.c.auto.html
    printf "csPixelClock %u\n" $(((($clock  & 0xff) << 8) | ($clock >> 8)))
    printf "csHorizontalActive %u\n" $(($horizActive | (($horizHigh & 0xf0) << 4)))
    printf "csHorizontalBlanking %u\n" $(($horizBlanking | (($horizHigh & 0x0f) << 8)))
    printf "csVerticalActive %u\n" $(($verticalActive | (($verticalHigh & 0xf0) << 4)))
    printf "csVerticalBlanking %u\n" $(($verticalBlanking | (($verticalHigh & 0x0f) << 8)))
    printf "csHorizontalSyncOffset %u\n" $(($horizSyncOffset | (($syncHigh & 0xc0) << 2)))
    printf "csHorizontalSyncPulseWidth %u\n" $(($horizSyncWidth | (($syncHigh & 0x30) << 4)))
    printf "csVerticalSyncOffset %u\n" $(((($verticalSyncOffsetWidth & 0xf0) >> 4) | (($syncHigh & 0x0c) << 4)))
    printf "csVerticalSyncPulseWidth %u\n" $(((($verticalSyncOffsetWidth & 0x0f) >> 0) | (($syncHigh & 0x03) << 4)))
    printf "csHorizontalBorderLeft %u\n" $horizBorder
    printf "csHorizontalBorderRight %u\n" $horizBorder
    printf "csVerticalBorderTop %u\n" $verticalBorder
    printf "csVerticalBorderBottom %u\n" $verticalBorder
    printf "csHorizontalSyncConfig %u\n" $((($flags & 2) ? kSyncPositivePolarityMask : 0))
    printf "csHorizontalSyncLevel 0\n"
    printf "csVerticalSyncConfig %u\n" $((($flags & 4) ? kSyncPositivePolarityMask : 0))
    printf "csVerticalSyncLevel 0\n"
}

#hex2values "292700E050381F4040403A00000000000018"
hex2values "286800E0F0701F8040403A00000000000018"