From 27e93155f424a89e57f193ddaaae1745ac56a258 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Mon, 27 Sep 2021 14:47:01 +1000
Subject: [PATCH] HAL_ChibiOS: fixed build on boards with OTG2 and no CAN
 interfaces

---
 libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
index 78ac3e037a..9c1453dd2d 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py
@@ -1459,7 +1459,7 @@ def write_UART_config(f):
         f.write('#define HAL_HAVE_DUAL_USB_CDC 1\n')
         if env_vars.get('AP_PERIPH', 0) == 0:
             f.write('''
-#if HAL_NUM_CAN_IFACES
+#if defined(HAL_NUM_CAN_IFACES) && HAL_NUM_CAN_IFACES
 #ifndef HAL_OTG2_PROTOCOL
 #define HAL_OTG2_PROTOCOL SerialProtocol_SLCAN
 #endif