From cbc83d68cdb5b4697269dd43ef39d2c7e6496c4b Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Thu, 25 Jul 2019 19:13:00 +1000
Subject: [PATCH] HAL_ChibiOS: allow for CAN enable override on F4

---
 libraries/AP_HAL_ChibiOS/hwdef/common/stm32f47_mcuconf.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/stm32f47_mcuconf.h b/libraries/AP_HAL_ChibiOS/hwdef/common/stm32f47_mcuconf.h
index e3627924d9..41cab6f73f 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/stm32f47_mcuconf.h
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/stm32f47_mcuconf.h
@@ -128,8 +128,12 @@
 /*
  * CAN driver system settings.
  */
+#ifndef STM32_CAN_USE_CAN1
 #define STM32_CAN_USE_CAN1                  FALSE
+#endif
+#ifndef STM32_CAN_USE_CAN2
 #define STM32_CAN_USE_CAN2                  FALSE
+#endif
 #define STM32_CAN_CAN1_IRQ_PRIORITY         11
 #define STM32_CAN_CAN2_IRQ_PRIORITY         11