topic LPCXpresso11u68 UART in LPC Microcontrollers

LPCXpresso11u68 UART

mjuggles — Thu, 28 Jun 2018 21:54:58 GMT

I have connected and programmed a LPCXpresso11u68 (OM13058) but do not see an associated USB COM port. Does the LPCXpresso11u68 have this feature? If so, where is it documented?

Thank you,

Mark

Re: LPCXpresso11u68 UART

jeremyzhou — Fri, 29 Jun 2018 02:51:56 GMT

Hi Mark Johnson,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Before answering your question, I was wondering if you can introduce the testing process, it can help me to figure it out.

Have a great day,

TIC

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Re: LPCXpresso11u68 UART

mjuggles — Fri, 29 Jun 2018 13:35:43 GMT

I started with the link on the package for the LPCXpresso11U68 board: LPC 32-bit Arm-based Microcontrollers|NXP

This links to processor selection information and no information for this particular board. Eventually I found a video which showed which USB port to connect. "Target" or "Link"? Usually debuggers connect to a target. Wrong, "Link" is used for debugging.

MCXXpresso could not locate a debugger even with "MCXXpresso IDE LinkServer (inc. CMSIS-DAP) probes) checked.

The Windows 7 Device Manager shows "CMSIS-DAP" by NXP under HID devices.

Eventually I tried the "LPC-Link 2 Configurator Tool" and updated CMSIS-DAP. It still didn't work. Then I programmed the Segger J-Link image and MCUXpresso detected it and programming/debugging was possible. Just no UART access.

It looks like maybe CMSIS-DAP supports a UART but Segger J-Link does not. Eventually I discovered LPCScrypt v1.8.2 which says that it is the "recommenced" tool for programming the latest versions of CMSIS-DAP and J-Link firmware for LPCXpresso V2/V3 boards (although it does not mention LPC11). I was able to program the board with CMSIS-DAP. MCUXpresso still doesn't see the board.

So Plan B is to program with Segger J-Link and solder to the board.

Re: LPCXpresso11u68 UART

jeremyzhou — Mon, 02 Jul 2018 02:48:11 GMT

Hi Mark Johnson,
Thanks for your reply.
In my testing, the LPCXpresso11U68 board is able to be enumerated as a HID+CDC composite device no matter be programmed with CMSIS-DAP or J-Link firmware when it connects the PC host.

Fig 1

Fig 2

Fig 3

Have a great day,
TIC