finished debug menu, working on timing issues.

include/debug.h

@@ -12,6 +12,7 @@ typedef struct {
     u16 dissasembly_scroll;
     u16 dissasembly_target; 
     u16 dissasembly_pc;
+    u16 breakpoint;
 } debug_context;
 
 void debug_update();

lib/bus.c

@@ -76,6 +76,7 @@ void bus_write(u16 address, u8 value) {
         return;
     } else if (address < 0xFE00) {
         //reserved echo ram...
+        wram_write((address & 0x1FFF) | 0xC000, value);
         return;
     } else if (address < 0xFEA0) {
         //OAM

lib/cpu.c

@@ -6,6 +6,7 @@
 #include <dbg.h>
 #include <timer.h>
 #include <memory.h>
+#include <debug.h>
 
 static cpu_context ctx = {0};
 #define CPU_DEBUG 1
@@ -68,12 +69,17 @@ bool cpu_step() {
         );
 #endif
         fetch_data(&ctx);
+        if(debug_get_context()->breakpoint && pc == debug_get_context()->breakpoint) {
+            emu_get_context()->paused = true;
+            emu_get_context()->debug = true;
+            debug_get_context()->state = DS_DISASSEMBLE;
+        }
         while(emu_get_context()->paused && !emu_get_context()->step)
             delay(10);
         if(emu_get_context()->paused) {
             emu_get_context()->step--;
             if(emu_get_context()->step == 0) {
-                printf("debug!\n");
+                //printf("debug!\n");
                 emu_get_context()->debug = true;
             }
         }

lib/debug.c

@@ -51,16 +51,13 @@ void debug_update() {
             } else if(!strcmp(cmd, "da")) {
                 scanf("%d", &ctx.dissasembly_target);
                 ctx.state = DS_DISASSEMBLE;
-            } else if(!strcmp(cmd, "du")) {
-                ctx.dissasembly_target--;
-                ctx.state = DS_DISASSEMBLE;
-            } else if(!strcmp(cmd, "dd")) {
-                scanf("%d", &ctx.dissasembly_target);
-                ctx.state = DS_DISASSEMBLE;
+            } else if(cmd[0] == 'b' && cmd[1] == 'p') {
+                scanf("%X", &ctx.breakpoint);
+                //printf("Set breakpoint to %04X\n", ctx.breakpoint);
             } else if(cmd[0] == 's') {
                 int steps;
                 scanf("%d", &steps);
-                printf("adding %d steps\n", steps);
+                //printf("adding %d steps\n", steps);
                 emu_get_context()->step += steps;
                 emu_get_context()->debug = false;
             }
@@ -73,7 +70,7 @@ void debug_update() {
                 fetch_instruction(&cpu_ctx);
                 fetch_data(&cpu_ctx);
                 char inst[16];
-                inst_to_str(cpu_get_context(), inst);
+                inst_to_str(&cpu_ctx, inst);
                 sprintf(dissasembly[i], "%04X: %s", pc, inst);
                 if(pc == cpu_get_context()->inst_pc) {
                     ctx.dissasembly_scroll = i - 5;

lib/emu.c

@@ -132,6 +132,8 @@ int emu_run(int argc, char **argv) {
 }
 
 void emu_cycles(int cpu_cycles) {
+    if(emu_get_context()->paused && !emu_get_context()->step)
+        return;
     for (int i = 0; i < cpu_cycles; i++){
         for(int n = 0; n < 4; n++){
             ctx.ticks++;