From bbeaeaad54c4295e8f94a7d61f866f910a95d3a2 Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Tue, 29 Dec 2015 15:56:53 +0100
Subject: [PATCH] add WiFi TX power control

---
 .../ESP8266WiFi/src/ESP8266WiFiGeneric.cpp      | 17 +++++++++++++++++
 libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h  |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
index 3b13549f7..78c55f76f 100644
--- a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
+++ b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp
@@ -124,6 +124,23 @@ WiFiPhyMode_t ESP8266WiFiGenericClass::getPhyMode() {
     return (WiFiPhyMode_t) wifi_get_phy_mode();
 }
 
+/**
+ * set the output power of WiFi
+ * @param dBm max: +20.5dBm  min: 0dBm
+ */
+void ESP8266WiFiGenericClass::setOutputPower(float_t dBm) {
+
+    if(dBm > 20.5) {
+        dBm = 20.5;
+    } else if(dBm < 0) {
+        dBm = 0;
+    }
+
+    uint8_t val = (dBm*4.0f);
+    system_phy_set_max_tpw(val);
+}
+
+
 /**
  * store WiFi config in SDK flash area
  * @param persistent
diff --git a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h
index 26381b43b..2232941c9 100644
--- a/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h
+++ b/libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h
@@ -46,6 +46,8 @@ class ESP8266WiFiGenericClass {
         bool setPhyMode(WiFiPhyMode_t mode);
         WiFiPhyMode_t getPhyMode();
 
+        void setOutputPower(float_t dBm);
+
         void persistent(bool persistent);
 
         bool mode(WiFiMode_t);