LPCScrypt not working with dfu-util 0.10 on Linux

[jdj]

Since there isn't a dedicated subforum for LPCScrypt, I'm posting here.

The script dfu_boot included in the package fails with dfu-util 0.10.

There is a bug in checking dfu-util version. What, presumably, was a check for version 0.1, checks only the first three characters. Depending on this check, different VID:PID formatting is (in this case incorrectly) used. This makes the script fail at find the correct device in the output of dfu-util -l.

Most likely this check can be dealt away with in it's entirety, since version 0.5 is dated at 2012. As seen here 0.1 did indeed use different formatting.

Below is a quick patch (which works for me) removing that test and the used variable entirely.

My version of dfu-util is 0.10, the current Manjaro community package.

--- dfu_boot.bak 2021-04-12 19:44:12.055974951 +0200
+++ dfu_boot 2021-04-12 20:00:45.602209668 +0200
@@ -128,11 +128,6 @@
}
$LOGGING && echo "Using dfu-util version $dfu_ver at `which $DFU_UTIL`"

-# establish what kind of prefix VID:PIDs have when listed in -l
-vp_hex=
-[ "${dfu_ver::3}" = "0.1" ] && vp_hex="0x"
-# echo "DFU version $dfu_ver means we should use hex prefix '$vp_hex'"
-
if [ "_$DEVICE_VID_PID" != "_${DEVICE_VID_PID/:}" ]; then
# we have specified VID and PID in this argument
DEVICE_PID="${DEVICE_VID_PID//*:}"
@@ -164,7 +159,7 @@
fi
DEVICE_VID="${DEVICE_VID/0x}"
DEVICE_PID="${DEVICE_PID/0x}"
-DEVICE_VID_PID="${vp_hex}$DEVICE_VID:${vp_hex}$DEVICE_PID"
+DEVICE_VID_PID="$DEVICE_VID:$DEVICE_PID"
#DEVICE_VID_PID="\(0x\|\)$DEVICE_VID:\(0x\|\)$DEVICE_PID"

echo "Looking for DFU devices with VID $DEVICE_VID PID $DEVICE_PID ..."

[ZhangJennie]

Hj jdj,

To check your issue, please answer me below questions:

1. Which version of LPCScrypt do you work with? Please make sure you use the latest LPCScrypt v2.1.2 which can be downloaded from this url

https://www.nxp.com/design/microcontrollers-developer-resources/lpc-microcontroller-utilities/lpcscr...

2. Do you use NXP demo board? if yes, which one? If your own PCB, which part do you use?

3. steps of how to reproduce your issue? 

Thanks,

Jun Zhang

[ashley_c4]

I encountered this same problem with LPCScrypt 2.1.2 and dfu-util 0.11. LPCScrypt on Windows, since it includes its own dfu-util, is fine, but on Linux I had trouble flashing the Link2 probe on my LPCXpresso51U68. I just commented out the line in dfu_boot that sets vp_hex to '0x'. Equivalent sed command:
sudo sed -i 's/\[ \"\${dfu_ver/#[ "\${dfu_ver/' /usr/local/lpcscrypt/scripts/dfu_boot

I think rather than querying the version and deciding how to parse vid/pid, it would be better to query the vid/pid itself.

[jdj]

1. Latest LPCScrypt.
2. LPC-Link2 - I was trying to program it with debugger firmware
3. While it is not officially supported, easiest way would be using Arch or Manjaro Linux with the community/dfu-util package - after fixing the script (by removing that version check) it works. But any Linux with dfu-util version 0.10 would work. As of now I'm not aware of any point release distribution using it.

[ZhangJennie]

Thanks for the sharing.