About the operation of GPIO_EMC_25 and GPIO_EMC_27 of i.MX RT1021

[takagi_y]

The following phenomenon has occurred on a custom board of i.MX RT1021 (100pin QFP).

GPIO_EMC_25 and GPIO_EMC_27 of RT1021 are set as GPIO and output "L" or "H".

When a program is written to the FlashROM and run, the specified value is output from the above two ports, but when a debugger (LinkServer Debugger) is connected and run, the output remains at "L" level.

Of the peripherals that use the two ports, FLEXIO1, SAI1, and SEMC are not supplied with a clock, and it has been confirmed that the LPUART8 register remains in its initial state.

Do you have any idea why the operation of GPIO_EMC_25 and GPIO_EMC_27 changes depending on whether or not a debugger is used?

Best regards

[Omar_Anguiano]

Is it possible that the debugger contains an script that modifies the pads configuration enabling the pull-down.

Best regards,
Omar

[takagi_y]

Thank you for your reply.

By "script", do you mean the Reset script and Connect script in the red box below?

The Connect script RT1020_connect.scp is the one from the demo obtained by ”Import SDK example(s)", but does it include a process to manipulate the pads configuration?

Just to be sure, I will attach the contents of RT1020_connect.scp.

1 REM ======================================

2 REM Copyright 2019-2020, 2023 NXP

3 REM All rights reserved.

4 REM SPDX-License-Identifier: BSD-3-Clause

5 REM ======================================

100 REM ===============================

110 REM RT1020_connect.scp

150 REM ===============================

160 print "RT1020 Connect Script"

170 REM probelist

180 p% = probefirstfound

190 rem probeopenbyindex p%

200 wireswdconnect p%

210 selectprobecore p% 0

220 cminitapdp this

230 cmhalt this

235 goto 320

240 rem trap in bootrom

250 cmwatchset this 0 0x400F8004 RW

260 cmresetvectorcatchclear this

270 print "Resetting and trapping"

280 cmsysresetreq this

290 print "Back from reset"

300 cmresetvectorcatchset this

310 cmwatchclear this 0

320 print "Disabling MPU"

330 s% = Peek32 this 0xE000ED94

340 s% = s% & 0xFFFFFFFE

350 Poke32 this 0xE000ED94 s%

360 REM ====== Configure FlexRAM ======

370 print "Configure FlexRAM for 128KB OC RAM, 64KB I-TCM, 64KB D-TCM"

380 REM TCM CTRL Poke 0x400B0000 - to force RAM clocking and set wait states = b100

390 Poke32 this 0x400B0000 0x4

400 REM IOMUXC_GPR17 0x400AC044 - this sets bitfield allocation of FlexRAM 32KB banks to OC 128KB b01, I 64KB b11, D 64KB b10

405 REM Default FlexRAM RAM bank partioning: O,O,D,D,I,I,O,O

410 Poke32 this 0x400AC044 0x5FA5

420 REM IOMUXC_GPR16 0x400AC040 - this sets enables for I and DTCM and the source of the TCM config = 0x200007

430 Poke32 this 0x400AC040 0x200007

440 print "Finished"

450 REM ===============================

460 end

If the pads configuration has been changed in RT1020_connect.scp, how can I change it to disable the settings of GPIO_EMC_25 and GPIO_EMC_27?

Also, is there a manual for this script?

Best regards