Fix rtthread CAN driver issue.

xeonxu · xeonxu · commit 52729bb62d12 · 2019-01-13T23:37:15.000-08:00
Reset rx tx handler when closing CAN device, Or it will not work after
reopening.

Change-Id: I43482c21263a989322f8df2ac9349128f7cb630a
diff --git a/components/drivers/can/can.c b/components/drivers/can/can.c
@@ -405,6 +405,7 @@ static rt_err_t rt_can_close(struct rt_device *dev)
 
         rt_free(rx_fifo);
         dev->open_flag &= ~RT_DEVICE_FLAG_INT_RX;
+        can->can_rx = RT_NULL;
         /* configure low level device */
         can->ops->control(can, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_RX);
     }
@@ -418,6 +419,7 @@ static rt_err_t rt_can_close(struct rt_device *dev)
 
         rt_free(tx_fifo);
         dev->open_flag &= ~RT_DEVICE_FLAG_INT_TX;
+        can->can_tx = RT_NULL;
         /* configure low level device */
         can->ops->control(can, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_TX);
     }

Original file line number	Diff line number	Diff line change
`@@ -405,6 +405,7 @@ static rt_err_t rt_can_close(struct rt_device *dev)`
`405`	`405`
`406`	`406`	`rt_free(rx_fifo);`
`407`	`407`	`dev->open_flag &= ~RT_DEVICE_FLAG_INT_RX;`
	`408`	`+ can->can_rx = RT_NULL;`
`408`	`409`	`/* configure low level device */`
`409`	`410`	`can->ops->control(can, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_RX);`
`410`	`411`	`}`
`@@ -418,6 +419,7 @@ static rt_err_t rt_can_close(struct rt_device *dev)`
`418`	`419`
`419`	`420`	`rt_free(tx_fifo);`
`420`	`421`	`dev->open_flag &= ~RT_DEVICE_FLAG_INT_TX;`
	`422`	`+ can->can_tx = RT_NULL;`
`421`	`423`	`/* configure low level device */`
`422`	`424`	`can->ops->control(can, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_TX);`
`423`	`425`	`}`