57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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//
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// Created by william on 12/23/23.
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//
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#include "include/cpu.h"
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#include "include/system.h"
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#include "memory.h"
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#include <unistd.h>
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#include <assert.h>
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#include <log.h>
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void system_init(System *system) {
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byte *registers_base_addr = &system->ram[PPU_REGISTERS_BASE_ADDR];
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byte *oam_dma_register = &system->ram[PPU_REGISTER_OAM_DMA_ADDR];
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cpu_init(&system->cpu);
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ppu_init(&system->ppu, registers_base_addr, oam_dma_register);
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system->mapper = get_mapper(MAPPER_TYPE_SIMPLE);
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system->cycle_count = 7;
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}
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void system_start(System *system) {
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address pc = mem_get_word(system, 0xfffc);
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system->cpu.program_counter = pc;
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}
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void system_loop(System *system) {
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assert(CPU_CLOCK_DIVISOR > PPU_CLOCK_DIVISOR);
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unsigned int master_cycle_per_frame = MASTER_CLOCK / FRAME_RATE;
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unsigned int cpu_cycle_per_frame = master_cycle_per_frame / CPU_CLOCK_DIVISOR;
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unsigned int ppu_cycle_per_cpu_cycle = CPU_CLOCK_DIVISOR / PPU_CLOCK_DIVISOR;
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long frame = 1;
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long cpu_cycle_count = 0;
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while (true) {
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log_info("Frame %d", frame);
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while (system->cycle_count < cpu_cycle_per_frame * frame) {
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if (cpu_cycle_count == system->cycle_count) {
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cpu_cycle(system);
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}
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cpu_cycle_count++;
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for (int ppu_c = 0; ppu_c < ppu_cycle_per_cpu_cycle; ppu_c++) {
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ppu_cycle(&system->ppu);
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}
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}
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frame++;
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usleep(17000); // Wait 16.6666ms
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}
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}
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void system_uninit(System *system) {
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}
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