From 363c9b1460cef3b6fedda34211e6651ac032196f Mon Sep 17 00:00:00 2001
From: tyustli <1225613647@qq.com>
Date: Fri, 23 Aug 2019 20:32:15 +0800
Subject: [PATCH] [bsp] [stm32] fix drv_can.c and can.c bug

---
 bsp/stm32/libraries/HAL_Drivers/drv_can.c |  4 ++++
 components/drivers/can/can.c              | 10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_can.c b/bsp/stm32/libraries/HAL_Drivers/drv_can.c
index d0221b9623..9c91ab0b48 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_can.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_can.c
@@ -515,7 +515,11 @@ static int _can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t fifo)
     /* get len */
     pmsg->len = rxheader.DLC;
     /* get hdr */
+#ifdef BSP_USING_CAN2
     pmsg->hdr = rxheader.FilterMatchIndex;
+#else
+    pmsg->hdr = (rxheader.FilterMatchIndex + 1) >> 1;
+#endif
 
     return RT_EOK;
 }
diff --git a/components/drivers/can/can.c b/components/drivers/can/can.c
index 48604993b9..3d60dbaa55 100644
--- a/components/drivers/can/can.c
+++ b/components/drivers/can/can.c
@@ -853,7 +853,10 @@ void rt_hw_can_isr(struct rt_can_device *can, int event)
             level = rt_hw_interrupt_disable();
             rx_length = can->hdr[hdr].msgs * sizeof(struct rt_can_msg);
             rt_hw_interrupt_enable(level);
-            can->hdr[hdr].filter.ind(&can->parent, can->hdr[hdr].filter.args, hdr, rx_length);
+            if (rx_length)
+            {
+                can->hdr[hdr].filter.ind(&can->parent, can->hdr[hdr].filter.args, hdr, rx_length);
+            }
         }
         else
 #endif
@@ -867,7 +870,10 @@ void rt_hw_can_isr(struct rt_can_device *can, int event)
                 rx_length = rt_list_len(&rx_fifo->uselist)* sizeof(struct rt_can_msg);
                 rt_hw_interrupt_enable(level);
 
-                can->parent.rx_indicate(&can->parent, rx_length);
+                if (rx_length)
+                {
+                    can->parent.rx_indicate(&can->parent, rx_length);
+                }
             }
         }
         break;