ESP8266: Add configuration for reset pin polarity

Author: ccli8

components/wifi/esp8266-driver/ESP8266Interface.cpp

@@ -143,7 +143,7 @@ ESP8266Interface::ResetPin::ResetPin(PinName rst_pin) : _rst_pin(mbed::DigitalOu
 void ESP8266Interface::ResetPin::rst_assert()
 {
     if (_rst_pin.is_connected()) {
-        _rst_pin = 0;
+        _rst_pin = MBED_CONF_ESP8266_RST_PIN_POLARITY;
         tr_debug("HW reset asserted");
     }
 }
@@ -152,7 +152,7 @@ void ESP8266Interface::ResetPin::rst_deassert()
 {
     if (_rst_pin.is_connected()) {
         // Notice that Pin7 CH_EN cannot be left floating if used as reset
-        _rst_pin = 1;
+        _rst_pin = !MBED_CONF_ESP8266_RST_PIN_POLARITY;
         tr_debug("HW reset deasserted");
     }
 }

components/wifi/esp8266-driver/mbed_lib.json

@@ -21,6 +21,10 @@
             "help": "RESET pin for the modem, defaults to Not Connected",
             "value": null
         },
+        "rst-pin-polarity": {
+            "help": "Polarity of RESET pin for the modem. [0/1]",
+            "value": 0
+        },
         "debug": {
             "help": "Enable debug logs. [true/false]",
             "value": false