[SOLVED] Using RTT in background mode with TI RM46

gabriel-fz · May 23rd 2023, 10:35pm

Hi,

I'm using Segger RTT with A TI Hercules RM46L (ARM® Cortex®-R4F 32-Bit RISC CPU), and I want to use RTT in background mode.
My problem is that the AP map detection seems to fail and fall back to the "Stop mode".

imgur.com/a/7BwTDBY
Imgur link because the forum is complaining about message size

While the SEGGER wiki does not mention it supports the cortex-R core, the Using RTT on Cortex-A/R based devices application notes mention that it can be enabled if the AHB-AP exist

imgur.com/a/RKgmcW6
Imgur link because the forum is complaining about message size

In the rm46l852 datasheet, there's mention that the AHB-AP exist

imgur.com/a/KrjfgOD
Imgur link because the forum is complaining about message size

So according to this information, I think it should be feasible to enable it.
It must be a configuration problem.

How do I enable the RTT in background mode?

I have tried to add the JlinkScritp without success

Source Code

int ConfigTargetSettings(void) {
JLINK_SYS_Report("J-Link Script: ConfigTargetSettings(): Skip ECC RAM initialization");
JLINK_ExecCommand("SetSkipInitECCRAMOnConnect = 1");
JLINK_ExecCommand("SetIndexAHBAPToUse = 0");
return 0;
}

As an additional note, I think I'm having a similar problem to this unresolved thread from 2019:
[ABANDONED] TI RM57x (Cortex R5F) and RTT Background Mode

Best,
Gabriel

SEGGER - Fabian · Jun 15th 2023, 2:40pm

Hi Gabriel,

RTT is already executed in background mode on the RM4x devices.
The background AP is implemented natively, so no actions/script files on your side needed.

You can verify this by opening the RTT tab in the J-Link Web Control Panel:
wiki.segger.com/J-Link_-_Web_control_panel

Only normal memory reads (e.g. via Mem32 in the J-Link Commander) will use stop mode,
as background access mode is currently only used by RTT & HSS.

I also answered you in the support ticket case.

BR
Fabian

[SOLVED] Using RTT in background mode with TI RM46

[SOLVED] Using RTT in background mode with TI RM46

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