Hello @ptcaos,
Unfortunately, MCUxpresso does not provide the option to create a project only in assembler.
However, you can use assembler with the next syntaxis:
Habib_MS_0-1722378008790.png
Also, you can combine C with these instructions, as shown the images below:
Habib_MS_1-1722378008791.png
Habib_MS_2-1722378008792.png
On the other hand, MCUxpresso provides an alternative to see the disassembly of your code when you are in a debug session, where is show in the next window:
Habib_MS_3-1722378008792.png
Also, if you experience any issue, do not hesitate to let me know.
BR,
Habib.