topic Re: iMX RT1204 EVK Serial Download not working in Kinetis Microcontrollers

iMX RT1204 EVK Serial Download not working

JoaoBorba — Fri, 25 Apr 2025 14:25:04 GMT

Hello everyone,
I'm trying to make a Serial Download with an iMx RT1024 EVK via UART and the blhoste.exe 2.6.7 software, but I can't get the initial ping.

The DIP switch SW3 is set to position 0001 (Serial Download)

I'm connecting my cabe USB/UART via pins J17:8 and J17:12 of Arduino interface (the same ones I can connect when I use "evkmimxrt1024_lpuart_polling example" that is working)

But for the Serial Download I'm not getting a response.....

Is there any configuration I need to do to get the iMX RT1024 EVK to connect?

NOTE: I also tried with an iMX RT1020 EVK...but I got the same result...I can't get a initial ping from EVK

Re: iMX RT1204 EVK Serial Download not working

EdwinHz — Fri, 25 Apr 2025 17:48:28 GMT

Hi @JoaoBorba,

Could you try using the default USB/UART connection via J23 and let me know if it works? Also are you using Windows 11? Some users have experienced issues using blhost on Windows 11. If so, try using a host PC with Windows 10 instead, and let me know if it changes anything.

BR,
Edwin.

Re: iMX RT1204 EVK Serial Download not working

JoaoBorba — Sat, 26 Apr 2025 18:30:03 GMT

Hi EdwinHz

"Could you try using the default USB/UART connection via J23"

Yes. This was the connection that I used to simulate the example "evkmimxrt1024_lpuart_polling example". I used in Debug and Release.

"Also are you using Windows 11?"

Yes. I am using Windows 11.

This is the EVK key that I am changing to put in Serial Download or FlexSPI Boot

I made some measurements with an oscilloscope and put the images below:

1 - UART of the iMX RT1024 EVK.

EVK turned on with SW8(10 - FlexSPI Boot) working with the code of the evkmimxrt1024_lpuart_polling example

2 - UART of the iMX RT1024 EVK

EVK turn off with SW8(01 - Serial Download) and app blhost.exe sending ping command

3 - UART of the iMX RT1024 EVK

EVK turned on with SW8(01 - Serial Download) and app blhost.exe sending ping command

Apparently, when the EVK is turn on, connected in UART and configured in Serial Download mode, app blhost.exe isn´t sending the ping command.

Please, let me know if you would like any more information

Re: iMX RT1204 EVK Serial Download not working

JoaoBorba — Tue, 29 Apr 2025 17:43:11 GMT

Hi EdwinHz,

Today we did test with a hardware that we have here. This hardware uses a uP LPC5504.

In this case, we were able to connect to the hardware using the blhost.exe App.

See the image below:

Apparently the problem does not occur with this uP LPC5504...but it occurs with the uP iMx RT 102x.....