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2017-06-02add serial interface and a few std library functionsNao Pross11-90/+336
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
2017-05-03new file coding_rules.txt to have a consistent coding styleNao Pross1-0/+120
2017-05-02add serial device structNao Pross6-14/+104
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
2017-05-02sysio.h libc interfaceleleraffa97@hotmail.it1-0/+0
2017-05-02Basic sys io setupleleraffa97@hotmail.it1-0/+55
2017-05-02fix for sdcc makefileNao Pross4-32/+122
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).
2017-05-02switch to sdccNao Pross9-101/+62
- 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
2017-03-25added missing makefile for z80 and fixed gitignoreNao Pross1-0/+27
2017-03-25added missing makefile for z80 and fixed gitignoreNao Pross1-0/+27
2017-03-23created bios/kernel source code structureNao Pross6-0/+98