- [NEW] MBC3 implementat

mem.cpp

@@ -7,6 +7,7 @@
 
 #include "mbc_none.h"
 #include "mbc1.h"
+#include "mbc3.h"
 
 #define DIV hram[0x104]  // 0xff04 - 0xfe00
 #define TIMA hram[0x105]  // 0xff05 - 0xfe00
@@ -19,6 +20,7 @@ namespace mem
     void (*writeRom)(uint16_t, uint8_t);
     uint8_t (*readRam)(uint16_t);
     void (*writeRam)(uint16_t, uint8_t);
+    void (*tick)(void) = nullptr;;
 
     uint8_t bootrom[256];
     uint8_t *rom;
@@ -29,8 +31,10 @@ namespace mem
     uint8_t tags[65536];
 
     char *title = nullptr;
+    uint8_t mapper_type = 0;
     uint32_t rom_size = 0;
     uint32_t ram_size = 0;
+    uint16_t timer = 0;
 
     uint16_t dma_address = 0;
     uint8_t dma_pos = 160;
@@ -42,7 +46,7 @@ namespace mem
     void init(uint8_t* rom, const int size)
     {
         title = (char*)&rom[0x134];
-        uint8_t mapper_type = rom[0x147];
+        mapper_type = rom[0x147];
         rom_size = 32768 * (1 << rom[0x148]);
         int sizes[] = { 0, 0, 8, 32, 128, 64};
         ram_size = sizes[rom[0x149]] * 1024;
@@ -67,6 +71,19 @@ namespace mem
                 mem::readRam = mbc1::readRam;
                 mem::writeRam = mbc1::writeRam;
                 break;
+            case 0x0f:
+            case 0x10:
+            case 0x11:
+            case 0x12:
+            case 0x13:
+                mbc3::init(rom, rom_size, ram_size);
+                mem::resetMbc = mbc3::reset;
+                mem::readRom = mbc3::readRom;
+                mem::writeRom = mbc3::writeRom;
+                mem::readRam = mbc3::readRam;
+                mem::writeRam = mbc3::writeRam;
+                mem::tick = mbc3::tick;
+                break;
         };
 
         APU::init();
@@ -207,6 +224,11 @@ namespace mem
     uint16_t timer_frequencies[4] { 256*4, 4*4, 16*4, 64*4 };
     void update_mapped(const uint32_t dt)
     {
+        timer+=dt;
+        if (timer >= 4194304 ) {
+            timer -= 4194304;
+            if (mem::tick) mem::tick();
+        }
         // DIV Divider register (0xFF04)  (val com a timer bàsic)
         div_counter += dt;
         if (div_counter>=256) {