iMXRT1010 SWD interface disabled

ladislav_piroha — Tue, 08 Sep 2020 14:29:16 GMT

We built a new hardware based on iMXRT1011 and spent several hours with SWD interface bring up. MCU refused re-programming requests over SWD interface. Then we found 10K pull_down resistor on JTAG_MOD (GPIO_AD_11) in RT1010 reference board schematics that enables SWD interface. Funny thing is that I could not find anything mentioned IMXRT1010RM datasheet.
Fuse DAP_SJC_SWD_SEL is set to 0 so I would expect that SWD is enabled by default, but it's somehow overridden by GPIO_AD_11 and JTAG is selected when GPIO_AD_11 is floating.

Re: iMXRT1010 SWD interface disabled

victorjimenez — Wed, 09 Sep 2020 20:51:08 GMT

Hello,

Thanks for your feedback, I will pass it to the documentation team.

Also, when creating your own board besides using as reference the reference manual and the datasheet, I highly recommend you to use also the Hardware Development Guide for the RT1010.

https://www.nxp.com/docs/en/user-guide/MIMXRT1010HDUG.pdf

Have a great day,

Victor

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topic Re: iMXRT1010 SWD interface disabled in i.MX RT Crossover MCUs

iMXRT1010 SWD interface disabled

Re: iMXRT1010 SWD interface disabled