add memory debug buffer.. Fix FreeBSD by adding a delay..

main.c

@@ -190,6 +190,8 @@ int
 main(void)
 {
 
+	debug_printf("starting...\n");
+
 	BoardInitMcu();
 
 	Radio.Init(&revents);
@@ -200,6 +202,15 @@ main(void)
 #if 1
 	wait_for_vcp();
 
+	/*
+	 * This is required to use w/ FreeBSD.  Not sure why but if this
+	 * delay isn't here, the code will hang waiting for the output to
+	 * be sent, and it never does get sent.  I believe this is because
+	 * the packet to enable sending the data hasn't arrived yet, and
+	 * this code fails to handle that case, and drops the data on the
+	 * floor.
+	 */
+	DelayMs(50);
 	usb_printf("starting...\r\n");
 
 #endif

misc.c

@@ -26,13 +26,17 @@
 
 #include "misc.h"
 
+#include <stdarg.h>
+
 #include <usbd_cdc_if.h>
 #include <usb_device.h>
 
+static volatile uint32_t holding;
 void
 Error_Handler(void)
 {
-	/* XXX - handle error */
+	debug_printf("error_handler\n");
+	for (;;) holding++;
 }
 
 /*
@@ -48,3 +52,31 @@ wait_for_vcp(void)
 	}
 }
 
+#if MEM_DEBUG_BUF
+static char debugbuf[1024];
+static uint32_t debugpos;
+
+void
+debug_printf(const char *format, ...)
+{
+	char buf[128];
+	char *pos;
+	va_list args;
+	uint32_t length;
+	uint32_t cpy;
+
+	va_start(args, format);
+	length = vsnprintf(buf, sizeof buf, format, args);
+	va_end(args);
+
+	pos = &buf[0];
+	while (length) {
+		cpy = MIN(length, sizeof debugbuf - debugpos);
+		memcpy(&debugbuf[debugpos], pos, cpy);
+
+		debugpos += cpy;
+		pos += cpy;
+		length -= cpy;
+	}
+}
+#endif

misc.h

@@ -1,2 +1,13 @@
 void wait_for_vcp(void);
 void Error_Handler(void);
+
+#define MEM_DEBUG_BUF   0
+
+#if MEM_DEBUG_BUF
+void debug_printf(const char *format, ...);
+#else
+static inline void
+debug_printf(const char *format, ...)
+{
+}
+#endif