Merge pull request #39 from SummerGGift/2018_2_7

[修改] : 开启 uselect 模块。

port/mpconfigport.h

@@ -145,7 +145,7 @@
 #define MICROPY_PY_MACHINE_PIN_MAKE_NEW mp_pin_make_new
 #define MICROPY_PY_USOCKET          (1)
 #define MICROPY_PY_NETWORK          (0)
-#define MICROPY_PY_USELECT          (0)
+#define MICROPY_PY_USELECT          (1)
 #define MICROPY_PY_USSL             (0)
 #define MICROPY_SSL_MBEDTLS         (0)
 
@@ -165,13 +165,7 @@
 
 #define MICROPY_THREAD_YIELD() pyb_thread_yield()
 #else
-#define MICROPY_EVENT_POLL_HOOK \
-    do { \
-        extern void mp_handle_pending(void); \
-        mp_handle_pending(); \
-        __WFI(); \
-    } while (0);
-
+#define MICROPY_EVENT_POLL_HOOK
 #define MICROPY_THREAD_YIELD()
 #endif