st-link vs j-link

abdjam said:

what is the difference between st-link and j-link

Short answer: about £250 !

Full answer:

ST-Link is a low-cost product from ST, targetted specifically at their products:

https://www.st.com/en/development-tools/st-link-v2.html

https://blog.st.com/stlink-v3set-in-circuit-debugger-programmer/

J-Link is a full-function debug probe supporting a vast range of processors & development hosts:

https://www.segger.com/products/debug-probes/j-link/

abdjam said:

what is the relationship between JTAG/SW and them?

JTAG and SWD are the supported interfaces to the target chips

https://en.wikipedia.org/wiki/JTAG

https://en.wikipedia.org/wiki/JTAG#Serial_Wire_Debug

abdjam said:

what is the difference between st-link and j-link

Short answer: about £250 !

Full answer:

ST-Link is a low-cost product from ST, targetted specifically at their products:

https://www.st.com/en/development-tools/st-link-v2.html

https://blog.st.com/stlink-v3set-in-circuit-debugger-programmer/

J-Link is a full-function debug probe supporting a vast range of processors & development hosts:

https://www.segger.com/products/debug-probes/j-link/

abdjam said:

what is the relationship between JTAG/SW and them?

JTAG and SWD are the supported interfaces to the target chips

https://en.wikipedia.org/wiki/JTAG

https://en.wikipedia.org/wiki/JTAG#Serial_Wire_Debug