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* add serial interface and a few std library functionsNao Pross2017-06-0211-90/+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
* new file coding_rules.txt to have a consistent coding styleNao Pross2017-05-031-0/+120
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* add serial device structNao Pross2017-05-026-14/+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
* sysio.h libc interfaceleleraffa97@hotmail.it2017-05-021-0/+0
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* Merge remote-tracking branch 'origin/naopross' into atlasleleraffa97@hotmail.it2017-05-0210-101/+152
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| * fix for sdcc makefileNao Pross2017-05-024-32/+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).
| * switch to sdccNao Pross2017-05-029-101/+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
| * added missing makefile for z80 and fixed gitignoreNao Pross2017-03-251-0/+27
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* | Basic sys io setupleleraffa97@hotmail.it2017-05-021-0/+55
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* | added missing makefile for z80 and fixed gitignoreNao Pross2017-03-251-0/+27
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* created bios/kernel source code structureNao Pross2017-03-236-0/+98