Keyboard

sample/test.s

@@ -1,49 +1,76 @@
-; head position
-ldx #$00
-stx $00             ; head position low
-ldx #$e0
-stx $01             ; head position high
+draw_addr = $e000
+key_addr = $f001
+draw_colour_addr = $10
 
-; colours
-ldx #$f0
-stx $04             ; paint colour
-ldx #$00
-stx $05             ; rubber colour
+loop
+    lda #$0
+    jsr read_key
+    cmp #$0
+    beq loop
 
-jsr one
-jsr two
-jsr three
-jsr four
+    cmp #$50
+    bne not_left
+    jsr move_left
+    clv
+    bvc loop
 
-clv
-bvc end
+    not_left
+        cmp #$4f
+        bne not_right
+        jsr move_right
+        clv
+        bvc loop
 
-one
-    lda #$50
-    ldx #$00
-    sta ($00, x)
-    inc $00
+        not_right
+            cmp #$52
+            bne not_up
+            jsr move_up
+            clv
+            bvc loop
+
+            not_up
+                cmp #$51
+                bne loop
+                jsr move_down
+                clv
+                bvc loop
+
+    clv
+    bvc loop
+
+read_key
+    lda key_addr
+    ldx #$0
+    stx key_addr
     rts
 
-two
-    lda #$F0
-    ldx #$00
-    sta ($00, x)
+move_right
     inc $00
+    jsr render_dot
     rts
 
-three
-    lda #$FF
-    ldx #$00
-    sta ($00, x)
-    inc $00
+move_left
+    dec $00
+    jsr render_dot
     rts
 
-four
-    lda #$af
-    ldx #$00
-    sta ($00, x)
-    inc $00
+move_up
+    lda $00
+    sbc #$40
+    sta $0
+    jsr render_dot
     rts
 
-end
+move_down
+    lda $00
+    adc #$3f
+    sta $0
+    jsr render_dot
+    rts
+
+render_dot
+    inc draw_colour_addr
+    lda draw_colour_addr
+    ldx $00
+    sta draw_addr, x
+    rts

src/machine/keyboard.cpp

@@ -0,0 +1,43 @@
+#include "keyboard.h"
+#include <SDL2/SDL.h>
+#include <iostream>
+
+using namespace std;
+
+namespace emu_6502 {
+    Keyboard::Keyboard(Memory& memory) : memory(memory) {
+        count = 0;
+    }
+
+    void Keyboard::read() {
+        SDL_PollEvent(&event);
+
+        switch (event.type) {
+            case SDL_KEYDOWN:
+
+                //if(event.key.keysym.scancode < 255)
+                    memory.set_at(LAST_KEY_PRESS_ADDR, event.key.keysym.scancode);
+
+                cout << "CODE: " << event.key.keysym.scancode << endl;
+//                switch (event.key.keysym.sym) {
+//                    case SDLK_LEFT:
+//                        cout << "LEFT " << (uint16_t) count++ << endl;
+//                        break;
+//                    case SDLK_RIGHT:
+//                        cout << "RIGHT" << (uint16_t) count++ << endl;
+//                        break;
+//                    case SDLK_UP:
+//                        cout << "UP" << (uint16_t) count++ << endl;
+//                        break;
+//                    case SDLK_DOWN:
+//                        cout << "DOWN" << (uint16_t) count++ << endl;
+//                        break;
+//                    default:
+//                        break;
+//                }
+                break;
+            default:
+                return;
+        }
+    }
+}

src/machine/keyboard.h

@@ -0,0 +1,26 @@
+#ifndef INC_6502_EMULATOR_KEYBOARD_H
+#define INC_6502_EMULATOR_KEYBOARD_H
+
+#include "memory.h"
+#include <SDL2/SDL.h>
+
+namespace emu_6502 {
+    class Keyboard {
+    private:
+        static const uint16_t LAST_KEY_PRESS_ADDR = 0xF001;
+
+        uint16_t count;
+
+        SDL_Event event;
+        Memory& memory;
+
+    public:
+        Keyboard(Memory& memory);
+        Keyboard(const Keyboard&) = delete;
+        Keyboard& operator=(const Keyboard&) = delete;
+
+        void read();
+    };
+}
+
+#endif //INC_6502_EMULATOR_KEYBOARD_H

src/machine/machine.cpp

@@ -1,5 +1,6 @@
 #include "machine.h"
 #include "terminal.h"
+#include "keyboard.h"
 #include "../opcode/opcode-handler-directory.h"
 
 #include <stdexcept>
@@ -7,25 +8,26 @@
 namespace emu_6502 {
     class MachineImpl {
     private:
-        bool terminal_initialised = false;
         uint16_t code_loaded_at;
         uint16_t code_size;
 
+        uint32_t instruction_iteration;
+
         unique_ptr<Cpu> cpu;
         unique_ptr<Memory> memory;
         unique_ptr<Stack> stack;
         unique_ptr<Terminal> terminal;
+        unique_ptr<Keyboard> keyboard;
         unique_ptr<OpcodeHandlerDirectory> opcode_handler_dir;
     public:
         MachineImpl(bool init_terminal) {
             cpu = make_unique<Cpu>();
             memory = make_unique<Memory>();
             stack = make_unique<Stack>(*memory, cpu->get_sp());
+            keyboard = make_unique<Keyboard>(*memory);
 
-            if (init_terminal) {
+            if (init_terminal)
                 terminal = make_unique<Terminal>(*memory);
-                terminal_initialised = true;
-            }
 
             opcode_handler_dir = make_unique<OpcodeHandlerDirectory>();
         }
@@ -77,8 +79,10 @@ namespace emu_6502 {
                 auto byte = read_program_byte();
                 opcode_handler_dir->execute(byte, machine);
 
-//                if (terminal_initialised)
-//                    terminal->refresh();
+                if (instruction_iteration++ >= 100) {
+                    keyboard->read();
+                    instruction_iteration = 0;
+                }
             }
         }
     };

src/machine/terminal.cpp

@@ -25,19 +25,6 @@ namespace emu_6502 {
         SDL_Quit();
     }
 
-//    void Terminal::refresh() {
-//        int x, y = 0;
-//        for (auto i = LOW_ADDR; i <= HIGH_ADDR; i++) {
-//            x = (i - LOW_ADDR) % WIDTH;
-//            y = (i - LOW_ADDR) / HEIGHT;
-//
-//            draw_pixel(x, y, memory.get_at(i));
-//        }
-//
-//        SDL_RenderPresent(renderer);
-//        SDL_Delay(150);
-//    }
-
     void Terminal::on_memory_written(pair<uint16_t, uint8_t> address_value) {
         uint16_t address = address_value.first;
 
@@ -49,7 +36,7 @@ namespace emu_6502 {
             draw_pixel(x, y, colour);
 
             SDL_RenderPresent(renderer);
-            SDL_Delay(5);
+            SDL_Delay(50);
         }
     }
 

src/machine/terminal.h

@@ -19,7 +19,6 @@ namespace emu_6502 {
 
         Memory& memory;
 
-        SDL_Event event;
         SDL_Renderer* renderer;
         SDL_Window* window;
 
@@ -31,8 +30,6 @@ namespace emu_6502 {
         Terminal(const Terminal&) = delete;
         Terminal& operator=(const Terminal&) = delete;
         ~Terminal();
-
-        //void refresh();
     };
 }