stm32/modnwwiznet5k: Implement WIZNET5K.isconnected() method.

docs/library/network.rst

@@ -268,6 +268,11 @@ parameter should be `id`.
     Methods
     -------
     
+    .. method:: wiznet5k.isconnected()
+
+       Returns ``True`` if the physical Ethernet link is connected and up.
+       Returns ``False`` otherwise.
+
     .. method:: wiznet5k.ifconfig([(ip, subnet, gateway, dns)])
     
        Get/set IP address, subnet mask, gateway and DNS.

ports/stm32/modnwwiznet5k.c

@@ -414,6 +414,12 @@ STATIC mp_obj_t wiznet5k_regs(mp_obj_t self_in) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(wiznet5k_regs_obj, wiznet5k_regs);
 
+STATIC mp_obj_t wiznet5k_isconnected(mp_obj_t self_in) {
+    (void)self_in;
+    return mp_obj_new_bool(wizphy_getphylink() == PHY_LINK_ON);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(wiznet5k_isconnected_obj, wiznet5k_isconnected);
+
 /// \method ifconfig([(ip, subnet, gateway, dns)])
 /// Get/set IP address, subnet mask, gateway and DNS.
 STATIC mp_obj_t wiznet5k_ifconfig(size_t n_args, const mp_obj_t *args) {
@@ -445,6 +451,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(wiznet5k_ifconfig_obj, 1, 2, wiznet5k
 STATIC const mp_rom_map_elem_t wiznet5k_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_regs), MP_ROM_PTR(&wiznet5k_regs_obj) },
     { MP_ROM_QSTR(MP_QSTR_ifconfig), MP_ROM_PTR(&wiznet5k_ifconfig_obj) },
+    { MP_ROM_QSTR(MP_QSTR_isconnected), MP_ROM_PTR(&wiznet5k_isconnected_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(wiznet5k_locals_dict, wiznet5k_locals_dict_table);