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-rw-r--r--src/ao.h1
-rw-r--r--src/ao_usb.c2
2 files changed, 2 insertions, 1 deletions
diff --git a/src/ao.h b/src/ao.h
index 97cb75ae..a2dfadd0 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -110,6 +110,7 @@ ao_start_scheduler(void);
#define AO_PANIC_STDIO 7 /* Too many stdio handlers registered */
#define AO_PANIC_REBOOT 8 /* Reboot failed */
#define AO_PANIC_FLASH 9 /* Invalid flash part (or wrong blocksize) */
+#define AO_PANIC_USB 10 /* Trying to send USB packet while busy */
/* Stop the operating system, beeping and blinking the reason */
void
diff --git a/src/ao_usb.c b/src/ao_usb.c
index e4af8e45..d071fe6f 100644
--- a/src/ao_usb.c
+++ b/src/ao_usb.c
@@ -85,7 +85,7 @@ ao_usb_ep0_flush(void)
USBINDEX = 0;
cs0 = USBCS0;
if (cs0 & USBCS0_INPKT_RDY)
- ao_panic(0);
+ ao_panic(AO_PANIC_USB);
this_len = ao_usb_ep0_in_len;
if (this_len > AO_USB_CONTROL_SIZE)