CC2340R5-Q1: SWD init sequence

Edwin Musch

Prodigy 105 points

Part Number: CC2340R5-Q1
Other Parts Discussed in Thread: SEGGER

Tool/software:

The "CC23xx SimpleLink Wireless MCU" - Technical Reference Manual

( SWCU193 - April 2023 )

states on page 429 - section:

8.1.5 Debug and Active SWD Connections at Boot
The SWD debug port is activated whenever a long sequence of bits is clocked into the SWDIO pin by edges on
the SWDCK pin. The sequence is detected in all device power states except for reset but including shutdown by
a module called IceMelter and the SWD connection status remains until:

Q: What "long sequence" mean.

Is there a specific pattern ?

How long does it need to be ?

I try to get access to SWD - but there is no reaction from the CC2340R5-Q1.

over 1 year ago

0 Nima over 1 year ago

TI__Genius 15205 points

Hi Edwin,

I apologize for the late reply and have reached out to my colleagues for what a "long sequence" is. I'll respond tomorrow EOD.

Best,

Nima Behmanesh

0 Nima over 1 year ago in reply to Nima

TI__Genius 15205 points

Hi Edwin,

What debugger are you using?

Best,

Nima Behmanesh

0 Edwin Musch over 1 year ago in reply to Nima

Prodigy 105 points

Hello Nima,

I am using my own system - our programmer creates the SWD frames, but the CC2340R5-Q1 is not responding to any of the SWD commands.

There must be something missing to open up the SWD port ?

0 Nima over 1 year ago in reply to Edwin Musch

TI__Genius 15205 points

Hi Edwin,

Unfortunately, we only support Segger J-Link and the XDS110 for programming/debugging the devices. You would have to speak to the manufacturer of the debugger/programmer to get support.

Best,

Nima Behmanesh

0 Edwin Musch over 1 year ago in reply to Nima

Prodigy 105 points

Hello Nima,

In the RM - Section 5.3.1 Physical Interface - it states:

Upon physical connection of a debug probe, a configuration sequence must be sent from the debug probe to the
target device to initiate a valid SWD connection with the SW-DP. An invalid sequence doesn't wake the device
from shutdown mode. Once the sequence is transmitted and the SWD connection is established, communication
with enabled debug access points is possible and the boot code is alerted by asserting the DBGSS.DBGCTL[1]
SWDSEL bit, which is continuously monitored in the boot code. The debug probe must be disconnected by
sending a disconnection sequence from the debug probe to the target device

Can you share the "configuration sequence" with me?

0 Nima over 1 year ago in reply to Edwin Musch

TI__Genius 15205 points

Hi Edwin,

I don't believe that sequence is publicly available. I've reached out to some of my colleagues to get some more information for you.

Best,

Nima Behmanesh

0 Nima over 1 year ago in reply to Edwin Musch

TI__Genius 15205 points

Hi Edwin,

I believe we should take this off E2E and over email so we can better support you.

Best,

Nima Behmanesh

0 Nima over 1 year ago in reply to Nima

TI__Genius 15205 points

Hi Edwin,

I haven't heard back from you over email, however I do have an update. The SWD is public, and we implement the following specification: Arm Debug Interface Architecture Specification

Best,

Nima Behmanesh

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CC2340R5-Q1: SWD init sequence