From 13d2e84595525408d8f8cd1cab492178ed817648 Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Mon, 1 Jun 2026 13:18:19 +0200
Subject: [PATCH] Harden cross-core shared completion state

---
 src/usb/usb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/usb/usb.h b/src/usb/usb.h
index f296370..f2b9ed4 100644
--- a/src/usb/usb.h
+++ b/src/usb/usb.h
@@ -92,7 +92,7 @@ extern void card_exit(void);
 extern int card_status(uint8_t itf);
 extern void usb_init(void);
 
-extern uint16_t finished_data_size;
+extern volatile uint16_t finished_data_size;
 extern void usb_set_timeout_counter(uint8_t itf, uint32_t v);
 extern void card_init_core1(void);