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LPC-Link2 debugger crashes with MIMXRT1052 processor and LCD

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LPC-Link2 debugger crashes with MIMXRT1052 processor and LCD

‎01-29-2018 01:34 PM
918 Views
craigsmith
Contributor III

Hi everyone,

I've been having an issue with using the LPC-Link2 debugger with the MIMXRT1052-EVK evaluation kit and I'd like to know if anyone has seen anything similar?

The issue is, when debugging code which displays an image on the LCD, the LPC-Link2 loses debug connection with the dev kit as soon as there an image on the LCD.  Error message is: 

16: Target error from status-poll: Ee(FF). Redlink interface error 255.
Debugging context: evkmimxrt1050_usb_examples_host_hid_mouse_keyboard_freertos Debug

My set up is:

  • External DC Power supply (no powering from USB)
  • Rocktech LCD connected (same result with Kyocera 4.3" LCD also).
  • OpenSDA disconnected from processor (J29, J30, J31, J32 jumpers removed)
  • LPC-Link2 debugger connected to JTAG header (J21)

Workarounds:

  • If LCD not driven with any image (ie, all black pixels only) there is no problem, can debug any other code fine.
  • No debugging - if I run in standalone mode from XIP Hyperflash there is no problem, code is stable
  • Other debuggers - J-Link and OpenSDA debuggers work fine and debug with the same code

Now obviously the workarounds aren't ideal as my application depends on using an LCD, I need to debug my code, OpenSDA is very slow (and I won't be installing in our our product's custom PCB) and J-Link are expensive when having to buy for whole development team!

I've tried shielding the LCD FPC and the LPC-Link2 JTAG cable.  This had no effect.  Does anyone else have any suggestions or insight as to what may be occurring?

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‎02-06-2018 02:15 AM
672 Views
art
NXP Employee
NXP Employee

Do you mean that the issue occurs even when the LCD interface itself is running, but the pixel data are constant (all black or all white or all any other color) causing no transitions on the LCD data lines? If so, it actually looks like some crosstalk between the LCD data signals and JTAG signals. Try to check the JTAG signal integrity with the oscilloscope.

Another hint is that it's always better (from the signal integrity point of view) to have the common ground for the board power supply and the probe power supply. So, try to power the board through the USB OTG port connecting it to the USB Host port of the same PC which you connect your LPC-Link2 probe to.


Have a great day,
Artur

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