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fix for bug in usart.c, in function usart_write() that checked the
trasmission_empty register at the wrong time causing it to overwrite
the buffer.
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changes in usart:
- new functions to setup the serial comunication settings such as baudrate,
parity and stop bits
- init function with most common values
- transmit and receive functions each with a wrapper to send data blocks
changes in libc:
- new file stdio.c with basic implementation of putch, printf still a prototype
- new file string.c with memcpy() function
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other changes:
- change from main() to kmain() in crt0.s and kernel.c
- new file devices.h to define all address locations for devices
- new data type
- register_t as volatile uint8_t for registers in devices
- size_t from libc
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fix for the old makefile, because it could't compile more than one source file.
new libc directory with mem.c to start implementing the standard C library
(or at least the part we need).
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- update of the makefile to use sdcc, since it is more popular and
it's easier to insall on other computers
- fix of crt0.s (old loader.asm) for the new compiler
- change of the structure in the source code folder to separate
betweeen libc and kernel code
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