You can learn C from several tutorials, K&R being the best probably.
Embedded C has a number of quirks that make it very compiler dependent.
For example sdcc is very ANSI-like (unlike most other embedded compilers
imho). It also has a buyilt in aggressive optimizer, and that means that
all and I mean *all* global variables that are used concurrently must be
marked volatile. Other than that, it's like the other free/open source
products: works, works, works, works ...

> Other than that, I also want to know if there is any way I can inform
> the compiled C program to execute instructions starting at a certain
> location I prefer instead of from 0000h?

You can do this by manipulating the assembly files (after compiling to
assembly) and linking them by hand, by changing the linker script and the
startup stub, by providing a function stub that will consume text segment
space where you need it (setting it to unprogrammed state, e.g. 0xFF), or
by rewriting the compiler's startup code (by providing your own function
instead of the original). I do not remember what the sdcc startup stub is
called, it is in the sdcc documentation.

Peter

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