Merge pull request #186 from grissiom/serial-fix

Serial fix

bsp/K60Fxxxx/drivers/drv_uart.c

@@ -218,7 +218,9 @@ static const struct rt_uart_ops _k60_ops =
 
 void UART5_RX_TX_IRQHandler(void)
 {
+    rt_interrupt_enter();
     rt_hw_serial_isr((struct rt_serial_device*)&_k60_serial);
+    rt_interrupt_leave();
 }
 
 

components/drivers/serial/serial.c

@@ -222,6 +222,10 @@ static rt_size_t rt_serial_read(struct rt_device *dev,
     struct rt_serial_device *serial;
 
     RT_ASSERT(dev != RT_NULL);
+
+    if (size == 0)
+        return 0;
+
     serial = (struct rt_serial_device *)dev;
 
     ptr = (rt_uint8_t *)buffer;
@@ -253,8 +257,8 @@ static rt_size_t rt_serial_read(struct rt_device *dev,
     }
 
     read_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
-    /* set error code */
-    if (read_nbytes == 0)
+    /* set error code if and only if in thread context */
+    if (read_nbytes == 0 && !rt_interrupt_get_nest())
     {
         rt_set_errno(-RT_EEMPTY);
     }
@@ -272,6 +276,10 @@ static rt_size_t rt_serial_write(struct rt_device *dev,
     struct rt_serial_device *serial;
 
     RT_ASSERT(dev != RT_NULL);
+
+    if (size == 0)
+        return 0;
+
     serial = (struct rt_serial_device *)dev;
 
     ptr = (rt_uint8_t*)buffer;
@@ -341,7 +349,8 @@ static rt_size_t rt_serial_write(struct rt_device *dev,
     }
 
     write_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
-    if (write_nbytes == 0)
+    /* set error code if and only if in thread context */
+    if (write_nbytes == 0 && !rt_interrupt_get_nest())
     {
         rt_set_errno(-RT_EFULL);
     }