esp8266: Expose simple pin API at C level.
diff --git a/esp8266/modpyb.h b/esp8266/modpyb.h
index 56159de..e4eaacb 100644
--- a/esp8266/modpyb.h
+++ b/esp8266/modpyb.h
@@ -1,3 +1,7 @@
 extern const mp_obj_type_t pyb_pin_type;
 extern const mp_obj_type_t pyb_adc_type;
 extern const mp_obj_type_t pyb_rtc_type;
+
+uint mp_obj_get_pin(mp_obj_t pin_in);
+int pin_get(uint pin);
+void pin_set(uint pin, int value);