Serial wire viewer not enable

[Ranjeet Singh]

i can not enable Serial wire Viewer .what i am missing ?

[Peter BENSCH]

SWV is not selectable because Cortex-M0 and Cortex-M0+ do not contain SWV, as can be read in e.g. KAN-297 from ARM:

Serial Wire Viewer (SWV) is a data trace feature found on many ARM Cortex-M3, M4, M7, M23, and M33 processors. Cortex-M0 and Cortex-M0+ do not have SWV.

If the problem is solved, please click Accept as Solution. This will help other users find that answer faster.

Regards
/Peter

[Tesla DeLorean]

Can't work on Cortex-M0(+), need to use other methods.

Keil uses Event Recording https://www.keil.com/appnotes/files/apnt_321.pdf

Some STM32 CM0(+) have UART pins mappable to SWDIO/SWCLK allowing for diagnostic output and sometimes input, via those pins absent a debug pod.

[RhSilicon]

Perhaps an alternative is to write the code for some MCU that has advanced debugging support, and then when it's functional, port the code to the MCU that doesn't have advanced debugging support.

[Tesla DeLorean]

+1 Yes using a proxy would be a possible path. If the problem is more nuanced that might be more difficult. The CM0(+) is distinctly more fussy about memory alignments, and instructions.

Having a good Hard Fault Handler, with diagnostic register, stack and opcode output can be very helpful for both lab and field debugging of issues via a serial terminal.

[Ranjeet Singh]

https://deepbluembedded.com/stm32-debugging-with-st-link-v2-swd-serial-wire-viewer/ 

i am following above instruction .its enanle in above microcontroller,why not in mine ?

[Tesla DeLorean]

To repeat once more, the SWV functionality is NOT implemented in CM0(+) cores, but is in CM3 and CM4(F)

The STM32F1 is a Cortex-M3 processor, the STM32L4 is a Cortex-M4F processor.