Fixed CHR RAM write

NesKitSwift/NesSystemSwift.swift

@@ -0,0 +1,23 @@
+//
+//  NesSystemSwift.swift
+//  NesKit
+//
+//  Created by Selim Mustafaev on 08.08.2025.
+//
+
+import Foundation
+import NesKitCpp
+
+class NesSystemSwift {
+    
+    var nesSystem: nes.System?
+    
+    init() {
+        
+        let frameBufferSize = nes.Ppu.SCREEN_WIDTH * nes.Ppu.SCREEN_HEIGHT * MemoryLayout<nes.Pixel>.stride
+        
+        nesSystem?.setNewFrameCallback({ frameBuffer in
+            
+        })
+    }
+}

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.8
+// swift-tools-version: 6.1
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -6,21 +6,32 @@ import PackageDescription
 let package = Package(
     name: "NesKit",
     platforms: [
-        .macOS(.v13),
-        .iOS(.v16)
+        .macOS(.v15),
+        .iOS(.v18)
     ],
     products: [
         .library(name: "NesKit", targets: ["NesKit"]),
+        .library(name: "NesKitSwift", targets: ["NesKitSwift"])
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
         // Targets can depend on other targets in this package and products from dependencies.
-        .target(name: "NesKitCpp",
+        .target(
+            name: "NesKitCpp",
             path: "src",
-                exclude: ["Logger.cpp", "Logger.h"]),
-        .target(name: "NesKit",
+            exclude: ["Logger.cpp", "Logger.h"]
+        ),
+        .target(
+            name: "NesKit",
             dependencies: [.target(name: "NesKitCpp")],
-                path: "NesKit")
+            path: "NesKit"
+        ),
+        .target(
+            name: "NesKitSwift",
+            dependencies: [.target(name: "NesKitCpp")],
+            path: "NesKitSwift",
+            swiftSettings: [.interoperabilityMode(.Cxx)]
+        )
     ],
     cxxLanguageStandard: .cxx20
 )

examples/sdl/main.cpp

@@ -22,7 +22,8 @@ int main() {
     });
     device.connect(std::make_shared<SdlKeyboardController>());
     //device.insertCartridge("/home/selim/Downloads/dk.nes");
-    device.insertCartridge("/Users/selim/Documents/drm.nes");
+    device.insertCartridge("/Users/selim/Documents/nes/ppu_tests/power_up_palette.nes");
+    device.insertCartridge("/Users/selim/Documents/nes/ff.nes");
     //device.insertCartridge("C:\\Users\\selim\\Documents\\nestest.nes");
 
     auto frameStart = std::chrono::steady_clock::now();

src/Bus.cpp

@@ -5,8 +5,6 @@
 #include "Bus.h"
 #include <iostream>
 
-#include "../../../../../../opt/homebrew/Cellar/fmt/11.2.0/include/fmt/format.h"
-
 namespace nes {
 
     Bus::Bus(uint8_t *ram,
@@ -48,6 +46,10 @@ namespace nes {
         return _cartridge->readChr(address);
     }
 
+    void Bus::writeChr(uint16_t address, uint8_t value) const {
+        _cartridge->writeChr(address, value);
+    }
+
     uint8_t Bus::read(uint16_t address) const {
         if(address < 0x2000) {
             return _ram[address & 0x07FF];

src/Bus.h

@@ -30,6 +30,7 @@ namespace nes {
 
         [[nodiscard]] Cartridge::Mirroring cartridgeMirroring() const;
         uint8_t readChr(uint16_t address) const;
+        void writeChr(uint16_t address, uint8_t value) const;
 
         uint8_t read(uint16_t address) const;
         void write(uint16_t address, uint8_t value);

src/Ppu.cpp

@@ -4,12 +4,12 @@
 
 #include "Ppu.h"
 
-#include "../../../../../../opt/homebrew/Cellar/fmt/11.2.0/include/fmt/base.h"
-
 #ifdef NES_LOGGING
 #include <fmt/format.h>
 #endif
 
+#include <print>
+
 namespace nes {
 
     Ppu::Ppu(): _column{}, _scanline{}, _status{}, _control{}, _mask{} {
@@ -230,7 +230,7 @@ namespace nes {
                 _oam->write(value);
                 break;
             default:
-                fmt::println("unknown ppu write");
+                //fmt::println("unknown ppu write");
                 break;
         }
     }
@@ -304,7 +304,7 @@ namespace nes {
         address &= 0x3FFF;
 
         if(address < 0x2000) {
-            // Can't write to CHR ROM
+            _bus->writeChr(address, value);
         }
         else if(address >= 0x2000 && address < 0x3F00) {
             address &= 0x0FFF;

src/Ppu.h

@@ -28,8 +28,8 @@ namespace nes {
 
     class Ppu {
     public:
-        static constexpr uint16_t SCREEN_WIDTH = 256;
-        static constexpr uint16_t SCREEN_HEIGHT = 240;
+        static const size_t SCREEN_WIDTH = 256;
+        static const size_t SCREEN_HEIGHT = 240;
 
         enum ControlAddress: uint16_t {
             Control     = 0x0000,

src/include/module.modulemap

@@ -0,0 +1,4 @@
+module NesKitCpp {
+    header "NesKitCpp.h"
+    export *
+}