3 files changed, 15 insertions, 7 deletions
diff --git a/ao-tools/lib/ccdbg-io.c b/ao-tools/lib/ccdbg-io.c
index 9c6693cd..d3f87274 100644
--- a/ao-tools/lib/ccdbg-io.c
+++ b/ao-tools/lib/ccdbg-io.c
@@ -22,25 +22,32 @@
 #include "cc-bitbang.h"
 
 struct ccdbg *
-ccdbg_open(void)
+ccdbg_open(char *tty)
 {
 	struct ccdbg *dbg;
-	char *tty;
 
 	dbg = calloc(sizeof (struct ccdbg), 1);
 	if (!dbg) {
 		perror("calloc");
 		return NULL;
 	}
-	tty = getenv("CCDBG_TTY");
-	if (!tty || tty[0] == '/')
-		dbg->usb = cc_usb_open(tty);
-	if (!dbg->usb) {
+	if (!tty)
+		tty = getenv("ALTOS_TTY");
+	if (!tty)
+		tty="/dev/ttyACM0";
+
+	if (!strcmp(tty, "BITBANG")) {
 		dbg->bb = cc_bitbang_open();
 		if (!dbg->bb) {
 			free(dbg);
 			return NULL;
 		}
+	} else {
+		dbg->usb = cc_usb_open(tty);
+		if (!dbg->usb) {
+			free(dbg);
+			return NULL;
+		}
 	}
 	return dbg;
 }
diff --git a/ao-tools/lib/ccdbg.h b/ao-tools/lib/ccdbg.h
index 4a2e3b9f..ca596143 100644
--- a/ao-tools/lib/ccdbg.h
+++ b/ao-tools/lib/ccdbg.h
@@ -258,7 +258,7 @@ ccdbg_hex_image_equal(struct hex_image *a, struct hex_image *b);
 
 /* ccdbg-io.c */
 struct ccdbg *
-ccdbg_open(void);
+ccdbg_open(char *tty);
 
 void
 ccdbg_close(struct ccdbg *dbg);
diff --git a/ao-tools/lib/cp-usb-async.c b/ao-tools/lib/cp-usb-async.c
index 6539394b..3e75b507 100644
--- a/ao-tools/lib/cp-usb-async.c
+++ b/ao-tools/lib/cp-usb-async.c
@@ -60,6 +60,7 @@ cp_usb_async_open(void)
 						     0x10c4, 0xea60);
 	cp->ack = -1;
 	if (!cp->handle) {
+		fprintf(stderr, "Cannot find USB device 10c4:ea60\n");
 		libusb_exit(cp->ctx);
 		free(cp);
 		return NULL;