Please note: We are aware of an issue affecting replies on the Arm Community forums, which may not be loading as expected.
We apologize for any inconvenience and appreciate your patience while we investigate and work to resolve the issue.
Thank you for your understanding.
Can I create application only with .C file?
How will know which clock speed to use?
It will run off the default clock (usually an internal RC oscillator) until your application reconfigures it (in a chip and vendor-specific manner.)