From 4bf29638ca03b641015be0c5c99c7da34e454d20 Mon Sep 17 00:00:00 2001
From: Daniele Verducci <daniele.verducci@ichibi.eu>
Date: Thu, 30 Jan 2025 08:05:06 +0100
Subject: [PATCH] Emulator: load ROM into memory

---
 pat80-emulator/main.c | 50 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 37 insertions(+), 13 deletions(-)

diff --git a/pat80-emulator/main.c b/pat80-emulator/main.c
index 2674b04..828651c 100644
--- a/pat80-emulator/main.c
+++ b/pat80-emulator/main.c
@@ -1,12 +1,14 @@
 #include <Z/constants/pointer.h> /* Z_NULL */
 #include <Z80.h>
 #include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 #define CYCLES_PER_FRAME 69888
 #define CYCLES_AT_INT    24
 #define CYCLES_PER_INT   32
 #define ROM_SIZE         0x8000 /* 32 KiB */
-#define MEMORY_SIZE      0x8000 /* 32 KiB */
+#define MEMORY_SIZE      0xFFFF /* 64 KiB */
 
 typedef struct {
         void* context;
@@ -108,29 +110,50 @@ void machine_reset(Machine *self)
         z80_instant_reset(&self->cpu);
         }
 
+void machine_run(Machine *self) {
+        z80_run(&self->cpu, Z80_MAXIMUM_CYCLES);
+}
 
-void machine_run_frame(Machine *self)
-        {
-        /* CPU cycles before the INT signal */
-        self->cycles += z80_execute(&self->cpu, CYCLES_AT_INT - self->cycles);
 
-        /* CPU cycles during the INT signal */
-        z80_int(&self->cpu, Z_TRUE);
-        self->cycles += z80_run(&self->cpu, (CYCLES_AT_INT + CYCLES_PER_INT) - self->cycles);
-        z80_int(&self->cpu, Z_FALSE);
+// void machine_run_frame(Machine *self)
+//         {
+//         /* CPU cycles before the INT signal */
+//         self->cycles += z80_execute(&self->cpu, CYCLES_AT_INT - self->cycles);
 
-        /* CPU cycles after the INT signal */
-        self->cycles += z80_execute(&self->cpu, CYCLES_PER_FRAME - self->cycles);
+//         /* CPU cycles during the INT signal */
+//         z80_int(&self->cpu, Z_TRUE);
+//         self->cycles += z80_run(&self->cpu, (CYCLES_AT_INT + CYCLES_PER_INT) - self->cycles);
+//         z80_int(&self->cpu, Z_FALSE);
 
-        self->cycles -= CYCLES_PER_FRAME;
+//         /* CPU cycles after the INT signal */
+//         self->cycles += z80_execute(&self->cpu, CYCLES_PER_FRAME - self->cycles);
+
+//         self->cycles -= CYCLES_PER_FRAME;
+//         }
+
+int main(int argc, char *argv[]) {
+        // Parse arguments
+        if (argc < 2) {
+                printf("Usage: %s [romFile]\n", argv[0]);
+                exit(0);
         }
+        char* romFilePath = argv[1];
 
-int main() {
         // Setup virtual Pat80 computer
         Z80 pat80Cpu = {};
         Device pat80Devices[] = {};
         zuint8  pat80Memory[65536] = {0};
 
+        // Load ROM into memory
+        FILE *romFile;
+        romFile = fopen(romFilePath,"rb");
+        if (romFile == NULL) {
+                printf("Unable to open rom file at %s", romFilePath);
+                exit(1);
+        }
+        fread(pat80Memory,ROM_SIZE,1,romFile); // load rom from file into memory, up to ROM_SIZE
+        fclose(romFile);
+
         Machine pat80 = {
                 /*zusize*/  .cycles = 0,
                 /*zuint8*/  .memory = *pat80Memory,
@@ -142,4 +165,5 @@ int main() {
         machine_initialize(&pat80);
         machine_power(&pat80, Z_TRUE);
         machine_reset(&pat80);
+        machine_run(&pat80);
 }
\ No newline at end of file