Why do I receive the linker error "function not defined" when the function is defined in my assembly routine?
To call a function defined in assembly from a C function the assembly function name must be prepended and with an underscore and made public via the xdef directive. e.g.
Assembly function:
xdef _foo
_foo:
...
end
C function:
extern void foo(void);
foo(); // Call assembly function _foo
Conversely, to call a C function from an assembly function
C function:
