Hi,

Im new to SeL4 and figuring out how to get input from a keyboard and
print it as of now What api calls do I use and How to do it

seL4 is just (micro-)kernel, so there is no real I/O API. There are
the seL4_DebugPutChar()seL4_DebugGetChar()syscalls for debug purposes,
that are usually mapped to a UART, The standard runtime library for
application provides a printf() implementation that uses them is not
dedicates driver is set up.
In general, on top of the seL4 kernel, it takes drivers (and driver
stacks in case of e.g. USB) then to implement input and output
channels. Furthermore, for display output a GUI framework is needed
Details are subject to an OS personality you plan to use - or have
to implement it yourself. To get started with seL4 there, I suggest
reading https://docs.sel4.systems/GettingStarted and then doing the
tutorials from https://docs.sel4.systems/Tutorials. A list of existing
components that might be useful for you can be found
at https://docs.sel4.systems/projects/available-user-components.html


Axel
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