feat: implement CPU module for Chip8 emulator with main execution loop, WIP

2 files changed, 57 insertions, 2 deletions

diff --git a/src/cpu.effekt b/src/cpu.effekt
new file mode 100644
index 0000000..c3cb9aa
--- /dev/null
+++ b/src/cpu.effekt
@@ -0,0 +1,42 @@
+module src/cpu
+
+import bytearray
+import src/ram
+import src/renderer
+
+/*
+The CPU for the Chip8 emulator.
+CPU Cycle and Effects:
+1. Fetch Opcode
+2. Decode Opcode
+3. Execute Opcode
+4. Update Timers
+5. Update Display
+6. Wait for next cycle
+*/
+
+namespace cpu {
+  def run(rom: ByteArray) {r: Renderer}: Unit = {
+    // Initialize the RAM
+    var ram = makeRam()
+    // Load the predefined fontset into the RAM and load the ROM
+    ram.init(rom)
+    
+    // Initialize the CPU registers
+    var v: ByteArray = allocate(16) // 16 8-bit registers
+    var i: Int = 0 // 16-bit register treat as 12-bit !!!
+
+    var delay: Byte = 0.toByte // Delay timer
+    var sound: Byte = 0.toByte // Sound timer
+
+    var pc: Int = 512 // Program counter
+    var sp: Byte = 0.toByte // Stack pointer
+    var stack: ByteArray = allocate(32) // Stack with 16 levels. Each level is 16-bit that is 2 bytes, so 32 bytes
+
+    // Main loop
+    // Fetch, Decode, Execute, Update Timers, Update Display
+    r.log("Starting the CPU...")
+    ()
+  }
+}
+
diff --git a/src/main.effekt b/src/main.effekt
index 35e7955..446f2ed 100644
--- a/src/main.effekt
+++ b/src/main.effekt
@@ -1,5 +1,18 @@
 module main // must be named same as the file!
 
-import src/lib
+import src/cpu
+import src/renderer
+import src/renderers/js
+import bytearray
 
-def main(): Unit = println(helloWorld())
\ No newline at end of file
+def main(): Unit = {
+  // Using the JS backend
+  def r = JSRenderer::makeRenderer
+  try {
+    r.init()
+  } with start { rom =>
+    log("ROM loaded to the functionnn!")
+    resume(())
+  }
+  ()
+}
\ No newline at end of file