fixed potential issue while set NRF pin to "off", added "default" behavior

tools/esp8266/html/setup.html

@@ -367,7 +367,7 @@
                     e.appendChild(lbl(p[1], p[0].toUpperCase()));
                     if("ESP8266" == type) {
                         e.appendChild(sel(p[1], [
-                            [255, "off"],
+                            [255, "off / default"],
                             [0, "D3 (GPIO0)"],
                             [1, "TX (GPIO1)"],
                             [2, "D4 (GPIO2)"],
@@ -389,7 +389,7 @@
                     }
                     else {
                         e.appendChild(sel(p[1], [
-                            [255, "off"],
+                            [255, "off / default"],
                             [0,  "GPIO0"],
                             [1,  "TX (GPIO1)"],
                             [2,  "GPIO2 (LED)"],

tools/esp8266/web.cpp

@@ -393,9 +393,9 @@ void web::showSave(AsyncWebServerRequest *request) {
         for(uint8_t i = 0; i < 5; i ++) {
             pin = request->arg(String(pinArgNames[i])).toInt();
             switch(i) {
-                default: mConfig->pinCs    = pin; break;
+                default: mConfig->pinCs    = ((pin != 0xff) ? pin : DEF_CS_PIN);  break;
-                case 1:  mConfig->pinCe    = pin; break;
+                case 1:  mConfig->pinCe    = ((pin != 0xff) ? pin : DEF_CE_PIN);  break;
-                case 2:  mConfig->pinIrq   = pin; break;
+                case 2:  mConfig->pinIrq   = ((pin != 0xff) ? pin : DEF_IRQ_PIN); break;
                 case 3:  mConfig->led.led0 = pin; break;
                 case 4:  mConfig->led.led1 = pin; break;
             }