Mercurial > repos > simple16
view src/main.c @ 0:7e44f7d5810b
Initial commit. CPU working well enough for simple hello world program.
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 22 Mar 2016 22:44:02 -0700 |
parents | |
children | 5176efdda5ae |
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#include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "cpu.h" #define CYCLES_PER_FRAME ((48000*25)/60) uint8_t rom[48 * 1024]; uint8_t ram[16 * 1024]; enum { PORT_CONTROLLER_1, PORT_CONTROLLER_2, PORT_CONTROLLER_3, PORT_CONTROLLER_4, PORT_FREQUENCY_A, PORT_FREQUENCY_B, PORT_FREQUENCY_C, PORT_FREQUENCY_D, PORT_VOLUME_AB, PORT_VOLUME_CD, PORT_TIMER, PORT_SERIAL, }; void debug_port_write(cpu *context, uint8_t port, uint16_t value) { putchar(value); } uint16_t debug_port_read(cpu *context, uint8_t port) { return getchar(); } memory_region regions[] = { {rom, 0, sizeof(rom)-1, MEM_READ}, {ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ}, }; void run_console(cpu *context) { for(;;) { run_cpu(context, CYCLES_PER_FRAME); context->cycles -= CYCLES_PER_FRAME; } } int main(int argc, char **argv) { if (argc < 2) { fputs("usage: s16 FILE\n", stderr); return 1; } FILE *f = fopen(argv[1], "rb"); if (!f) { fprintf(stderr, "Failed to open %s for reading\n", argv[1]); return 1; } size_t read; if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom)) { memset(rom + read, 0xFF, sizeof(rom)-read); } cpu *context = alloc_cpu(1, sizeof(regions)/sizeof(memory_region), regions); context->port_handlers[PORT_SERIAL].write = debug_port_write; context->port_handlers[PORT_SERIAL].read = debug_port_read; run_console(context); return 0; }