SWD connection status

[Daniel Reisfeld]

Hi,

I would like to generate messages based on whether the nrf52840 SWD is connected (through j-link and Segger Embedded Studio).

Is there a way to query this?

Thanks,

Daniel

[awneil]

The usual way is to check the DEBUGEN bit in DHCSR (the Debug Halting Control and Status Register)

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0337e/CEGCJAHJ.html

Note that this will not tell you the type of debug probe (eg, JLink), nor the IDE (eg, SES).

EDIT

Above link is for Cortex-M3.

M4 link: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0337e/CEGCJAHJ.html

[Daniel Reisfeld]

Thanks! Daniel

[awneil]

If that resolves the issue, please Verify the answer:

[Bruno Randolf]

As said before, but here is the relevant code fragment:

if (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk)