update dm9000a driver

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@195 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/stm32_radio/dm9000.c

@@ -175,12 +175,11 @@ void rt_dm9000_isr()
     /* Received the coming packet */
     if (int_status & ISR_PRS)
     {
-        rt_err_t result;
+	    /* disable receive interrupt */
+	    dm9000_device.imr_all = IMR_PAR | IMR_PTM;
 
         /* a frame has been received */
-        result = eth_device_ready(&(dm9000_device.parent));
-        if (result != RT_EOK) rt_kprintf("eth notification failed\n");
-        RT_ASSERT(result == RT_EOK);
+        eth_device_ready(&(dm9000_device.parent));
     }
 
     /* Transmit Interrupt check */
@@ -560,8 +559,9 @@ struct pbuf *rt_dm9000_rx(rt_device_t dev)
     }
     else
     {
-        /* restore interrupt */
-        // dm9000_io_write(DM9000_IMR, dm9000_device.imr_all);
+        /* restore receive interrupt */
+	    dm9000_device.imr_all = IMR_PAR | IMR_PTM | IMR_PRM;
+        dm9000_io_write(DM9000_IMR, dm9000_device.imr_all);
     }
 
     /* unlock DM9000 device */