There are already good suggestions on this item.

I do it in the same manner (starting with a blank sheet and a pencil, writing only small routines and test it, ...).

For tests on the target, I use often the UART. Also if they was not needed, after the whole project was finished.

Maybe, there can be add a tutorial with hints to start programming.



The stack pointer can be accessed also in C like any other SFR:

unsigned char idata *sptr;
sptr = SP;
printf("%02X ", (int)*sptr ); // return address high byte
sptr--;
printf("%02X ", (int)*sptr ); // return address low byte



Peter