From f350338642b3cf71cc6f61ca5014dc36a7e72a4c Mon Sep 17 00:00:00 2001
From: rusefillc <sdfsdfqsf2334234234>
Date: Wed, 22 Dec 2021 20:43:08 -0500
Subject: [PATCH] Second CAN #3687

---
 firmware/hw_layer/ports/stm32/stm32_common.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/firmware/hw_layer/ports/stm32/stm32_common.cpp b/firmware/hw_layer/ports/stm32/stm32_common.cpp
index 3bb4557b12..d4ae72783a 100644
--- a/firmware/hw_layer/ports/stm32/stm32_common.cpp
+++ b/firmware/hw_layer/ports/stm32/stm32_common.cpp
@@ -779,6 +779,9 @@ bool isValidCanRxPin(brain_pin_e pin) {
 }
 
 CANDriver* detectCanDeviceImpl(brain_pin_e pinRx, brain_pin_e pinTx) {
+	if (pinRx == GPIO_UNASSIGNED && pinTx == GPIO_UNASSIGNED) {
+		return nullptr;
+	}
 #if STM32_CAN_USE_CAN1 || STM32_CAN_USE_FDCAN1
    if (isValidCan1RxPin(pinRx) && isValidCan1TxPin(pinTx))
       return &CAND1;