Added new Debugcommand: jc <cycle offset> (Cycle Jump).

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+## v.0.4.3 - 2020-11-17
+
+- Added new Debugcommand: jc <cycle offset n> (jump cycles)
+    - Fast forwarding simulation without the need for setting breakpoints
+    - Useful when waiting for an event in an endless loop, like EEPROM Ready or a Timer Overflow.
+
 - Bugfix: Timer increments now, even when executing illegal opcode.
 - Timer Interrupts are now handled in TIFR0 and TIMSK0, too.
 

include/parser/commands.h

@@ -4,9 +4,9 @@
 #define COMMANDS_H
 
 #define NCON 3
-#define NCOM 26
+#define NCOM 27
 
 extern const int ncmd[2];
 extern const char *commands[NCON][NCOM];
 
-#endif
+#endif

include/state/debug/debugcommands.h

@@ -7,6 +7,7 @@ typedef struct _debugwindow debugwindow_t;
 typedef struct _system system_t;
 
 extern void jump_forward(debugwindow_t *window, system_t *sys, const int delay);
+extern void jump_cycles(debugwindow_t *window, system_t *sys, const int n);
 extern void set_breakpoint(debugwindow_t *window, system_t *sys, const char *bp);
 extern void remove_breakpoint(debugwindow_t *window, system_t *sys, const char *bp);
 extern void examine_data(debugwindow_t *window, system_t *sys, const char *mem_cell);
@@ -20,4 +21,4 @@ extern void show_clock(debugwindow_t *window, system_t *sys);
 extern void show_time(debugwindow_t *window, system_t *sys);
 extern void examine_data_byte(debugwindow_t *window, system_t *sys, const char *mem_cell);
 
-#endif
+#endif

include/state/debug/stdmsg.h

@@ -13,6 +13,10 @@
 #define BREAK_REACHED "(mdx) <--- Breakpoint reached --->\n"
 #define DELAY_ERR "(mdx) Invalid delay. Usage: jb <delay in ms>\n"
 
+#define CYCLE_JUMP_START "(mdx) Jumping to desired Cycle...\n"
+#define CYCLE_REACHED "(mdx) <--- Cycle reached --->\n"
+#define CYCLE_ERR "(mdx) Invalid cycle. Usage: jc <cycle offset>\n"
+
 #define MEM_CELL_ERR "(mdx) Illegal memory cell.\n"
 #define MEM_RANGE_ERR "(mdx) Literal length must be > 0.\n"
 #define EEP_DECODE_ERR "(mdx) Could not decode EEPROM Hex File.\n"

src/parser/commands.c

@@ -18,5 +18,5 @@ const char *commands[NCON][NCOM] = {
     /* DEBUG CONTEXT */
     { "n", "b", "rn", "rp", "dn", "dp", "jb", "en", "ep", "xd", "xe", "xdc",
       "xec", "leep", "clear", "q", "?", "break", "unbreak", "def", "pn",               
-      "pp", "cycles", "clock", "time", "xdb" }                                                      
-};
+      "pp", "cycles", "clock", "time", "xdb", "jc" }                                                      
+};

src/parser/parser.c

@@ -132,7 +132,7 @@ static bool parser_parse_debug(const struct _parser *this, list_t *items) {
         break;
 
         case 6: case 9: case 10: case 13: case 17:
-        case 18: case 25:
+        case 18: case 25: case 26:
 
             if(argc != 1)
                 return false;

src/state/debug/debugcommands.c

@@ -47,6 +47,23 @@ void jump_forward(debugwindow_t *window, system_t *sys, const int delay) {
     dwin_write(window, OPNL, BREAK_REACHED, G);
 }
 
+void jump_cycles(debugwindow_t *window, system_t *sys, const int n) {
+
+    if(n < 0) {
+
+        dwin_write(window, OPNL, CYCLE_ERR, D);
+        return;
+    }
+
+    const uint64_t end = (sys->cycles + n);
+    dwin_write(window, OPNL, CYCLE_JUMP_START, D);
+
+    while(sys->cycles < end)
+        sys_step(sys);
+
+    dwin_write(window, OPNL, CYCLE_REACHED, G);
+}
+
 void set_breakpoint(debugwindow_t *window, system_t *sys, const char *bp) {
 
     if(sys_add_breakp(sys, bp) < 0) {

src/state/debug/debugstate.c

@@ -94,6 +94,7 @@ void debug(system_t *sys, const char *file) {
             case 23: show_clock(window, sys);                                     break;
             case 24: show_time(window, sys);                                      break;
             case 25: examine_data_byte(window, sys, at(com, 1));                  break;
+            case 26: jump_cycles(window, sys, get_int(at(com, 1)));               break;
 
             default: /* ignoring invalid input */                                 break;
         }