Adapted PIA code to allow dropping to the debugger via the back tick key

git-svn-id: svn+ssh://svn.phoenixbox.net/svn/apple1/trunk@34 64f78de7-aa59-e511-a0e8-0002a5492df0

apple1/main.c

@@ -24,7 +24,6 @@
 #define ROM_SIZE		0x00FF
 #define RESET_VECTOR	0xFF00
 
-static int faulted = 0;
 static v6502_cpu *cpu;
 static a1pia *pia;
 
@@ -37,9 +36,13 @@ static void fault(void *ctx, const char *e) {
 //}
 
 static void run(v6502_cpu *cpu) {
+	int faulted = 0;
+	cpu->fault_callback = fault;
+	cpu->fault_context = &faulted;
+
 	FILE *asmfile = fopen("runtime.s", "w");
 	pia_start(pia);
-	while (!faulted) {
+	while (!faulted && !pia->signalled) {
 		dis6502_printAnnotatedInstruction(asmfile, cpu, cpu->pc);
 		v6502_step(cpu);
 		v6502_printCpuState(asmfile, cpu);
@@ -58,8 +61,6 @@ int main(int argc, const char * argv[])
 {
 	cpu = v6502_createCPU();
 	cpu->memory = v6502_createMemory(v6502_memoryStartCeiling + 1);
-	cpu->fault_callback = fault;
-	cpu->fault_context = &faulted;
 	
 	v6502_breakpoint_list *breakpoint_list = v6502_createBreakpointList();
 

apple1/pia.c

@@ -88,6 +88,11 @@ uint8_t keyboardReadReadyCallback(struct _v6502_memory *memory, uint16_t offset,
 	saveFreeze(memory, "freeze.ram");
 	int c = getch();
 	
+	if (c == '`') {
+		context->signalled++;
+		return KEYBOARD_NOTREADY;
+	}
+	
 	if (c != ERR) {
 		context->buf = asciiCharFromCursesKey(c);
 		return KEYBOARD_READY;
@@ -145,8 +150,11 @@ void pia_start(a1pia *pia) {
 	crmode();
 	noecho();
 	nonl();
+	pia->signalled = 0;
+	wrefresh(pia->screen);
 }
 
 void pia_stop(a1pia *pia) {
-	
+	pia->screen = NULL;
+	endwin();
 }

apple1/pia.h

@@ -23,6 +23,7 @@ typedef struct {
 	/** @brief Hardwired memory used to trap video activity and report keyboard input */
 	v6502_memory *memory;
 	char buf;
+	int signalled;
 } a1pia;
 
 a1pia *pia_create(v6502_memory *mem);