1 files changed, 3 insertions, 2 deletions
diff --git a/main.c b/main.c
index 462c2a8..fba678a 100644
--- a/main.c
+++ b/main.c
@@ -46,12 +46,13 @@ bool can_recv(CAN_FIFOMailBox_TypeDef *frame) {
 // This will get called when we get a new frame in FIFO1
 void canrx1_handler() {
 	// if the queue is full just drop the frame
-	if ((can_frame_queue.back + 1) % CAN_FRAME_QUEUE_DEPTH == can_frame_queue.front) {
+	int next_back = (can_frame_queue.back + 1) % CAN_FRAME_QUEUE_DEPTH;
+	if (next_back == can_frame_queue.front) {
 		CAN1->RF1R |= CAN_RF1R_RFOM1;
 		return;
 	}
 	can_frame_queue.data[can_frame_queue.back] = CAN1->sFIFOMailBox[1];
-	can_frame_queue.back = (can_frame_queue.back + 1) % CAN_FRAME_QUEUE_DEPTH;
+	can_frame_queue.back = next_back;
 	// tell the FIFO we are done with this frame
 	CAN1->RF1R |= CAN_RF1R_RFOM1;
 }