From d07073f4e2f37d9614340f7544985dfee834532e Mon Sep 17 00:00:00 2001
From: iabdalkader <i.abdalkader@gmail.com>
Date: Tue, 30 Jun 2020 23:08:20 +0200
Subject: [PATCH] stm32/fdcan: Support maximum timeout of HAL_MAX_DELAY in
 can_receive.

---
 ports/stm32/fdcan.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/ports/stm32/fdcan.c b/ports/stm32/fdcan.c
index 3ab72cdace..2892572f40 100644
--- a/ports/stm32/fdcan.c
+++ b/ports/stm32/fdcan.c
@@ -215,10 +215,12 @@ int can_receive(FDCAN_HandleTypeDef *can, int fifo, FDCAN_RxHeaderTypeDef *hdr,
     // Wait for a message to become available, with timeout
     uint32_t start = HAL_GetTick();
     while ((*rxf & fl) == 0) {
-        MICROPY_EVENT_POLL_HOOK
-        if (HAL_GetTick() - start >= timeout_ms) {
-            return -MP_ETIMEDOUT;
+        if (timeout_ms != HAL_MAX_DELAY) {
+            if (HAL_GetTick() - start >= timeout_ms) {
+                return -MP_ETIMEDOUT;
+            }
         }
+        MICROPY_EVENT_POLL_HOOK
     }
 
     // Get pointer to incoming message