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Date of registration: Nov 9th 2016

Posts: 3


Thursday, May 10th 2018, 5:15pm

[SOLVED] problem getting RTT working with STM32H743ZI and Ultra+

I'm trying to get RTT working on an STM32H743ZI and it doesn't log to terminal window and I can't get the J-Link RTT viewer to find the RTT control block in my CPU memory.

I'm using J-Link V6.22f with an Ultra+

I first tried to call SEGGER_RTT_WriteString, which setup the signature block. I connected RTT viewer, and log another SEGGER_RTT_WriteString, but no output to the Terminal window.

The menu Logging / Channel Infos says "RTT control block not found on target, yet."

I manually use J-Mem to find the RTT control block at 0x200196a4. I disconnect the RTT viewer and reconnect, but this time specifying the RTT control block at this memory. It connects properly, but the "Logging / Channel Infos" says the same thing and no logging goes to the terminal window.


Thanks...Keith Rhodes

Date of registration: Nov 9th 2016

Posts: 3


Thursday, May 10th 2018, 7:09pm

got it working

I reset jlink and MCU and it started working. Thanks...


Super Moderator

Date of registration: Jan 2nd 2017

Posts: 1,048


Monday, May 14th 2018, 9:29am


Great to hear that you are up and running again.
Generally we recommend using the latest J-Link software to have all new features and benefits of our regularly updated software.
We will consider this thread as solved now.

Best regards,
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