Fix compile, and tweak wait for debugger work.

ch32v003fun/ch32v003fun.c

@@ -764,7 +764,7 @@ void DefaultIRQHandler( void )
 #if FUNCONF_DEBUG_HARDFAULT
 	// Wait indefinitely for a debugger to attach.
 	while( !DidDebuggerAttach() );
-	printf( "DefaultIRQHandler MSTATUS:%08x MTVAL:%08x MCAUSE:%08x MEPC:%08x\n", (int)__get_MSTATUS(), (int)__get_MTVAL(), (int)__get_MCAUSE(), (int)__get_MEPC() );
+	printf( "DEAD MSTATUS:%08x MTVAL:%08x MCAUSE:%08x MEPC:%08x\n", (int)__get_MSTATUS(), (int)__get_MTVAL(), (int)__get_MCAUSE(), (int)__get_MEPC() );
 #endif
 	// Infinite Loop
 	asm volatile( "1: j 1b" );
@@ -1682,7 +1682,7 @@ WEAK int putchar(int c)
 void SetupDebugPrintf( void )
 {
 	// Clear out the sending flag.
-	*DMDATA1 = 0x0;
+	*DMDATA1 = 0x00;
 	*DMDATA0 = 0x80;
 }
 
@@ -1706,7 +1706,7 @@ int WaitForDebuggerToAttach( int timeout_ms )
 
 	// Wait for the sentinel to become zero.
 	while( !DidDebuggerAttach() ) {
-		if( (SYSTICKCNT - start) > timeout ) return 1;
+		if( timeout_ms && (SYSTICKCNT - start) > timeout ) return 1;
 	}
 
 	return 0;

ch32v003fun/ch32v003fun.h

@@ -46,6 +46,17 @@
 	7. Hardware MMIO structs, i.e.
 		SysTick->CNT = current system tick counter (can be Hclk or Hclk/8)
 		TIM2->CH1CVR = direct control over a PWM output
+
+    8. Default debug behavior, when semihosting:
+        a. You get access to DidDebuggerAttach() - so you can see if a debugger has attached.
+        b. WaitForDebuggerToAttach( int timeout_ms ) - if timeout_ms == 0, will wait for forever.
+        c. If a debugger has attached, printf will wait 120ms (configurable) to make sure it
+           doesn't drop data.  Otherwise, printf fast-path's to exit.  It will still do the string
+           formatting, but will not wait on output. Timeout is configured with
+           FUNCONF_DEBUGPRINTF_TIMEOUT
+        d. If you hard fault, it will wait indefinitely for a debugger to attach, once attached,
+           will printf the fault cause, and the memory address of the fault. Space can be saved
+           by setting FUNCONF_DEBUG_HARDFAULT to 0.
 */
 
 
@@ -13991,10 +14002,14 @@ void SystemInit(void);
 void SetupUART( int uartBRR );
 
 // Returns 1 if timeout reached, 0 otherwise.
+// If timeout_ms == 0, wait indefinitely.
+// Use DidDebuggerAttach() For a zero-wait way of seeing if it attached.
 int WaitForDebuggerToAttach( int timeout_ms );
 
 // Returns 1 if a debugger has activated the debug module.
-static int DidDebuggerAttach() { return !*DMSTATUS_SENTINEL; }
+#if defined(__riscv) || defined(__riscv__)
+inline static int DidDebuggerAttach() { return !*DMSTATUS_SENTINEL; }
+#endif
 
 // Just a definition to the internal _write function.
 int _write(int fd, const char *buf, int size);