Add an ESP32_CPU_FREQ build flag to lower freq

examples/companion_radio/main.cpp

@@ -1246,6 +1246,10 @@ void setup() {
   Serial.begin(115200);
 
   board.begin();
+#ifdef ESP32_CPU_FREQ
+  setCpuFrequencyMhz(ESP32_CPU_FREQ);
+#endif
+
 #ifdef SX126X_DIO3_TCXO_VOLTAGE
   float tcxo = SX126X_DIO3_TCXO_VOLTAGE;
 #else

examples/simple_repeater/main.cpp

@@ -664,6 +664,10 @@ void setup() {
   delay(1000);
 
   board.begin();
+
+#ifdef ESP32_CPU_FREQ
+  setCpuFrequencyMhz(ESP32_CPU_FREQ);
+#endif
 #ifdef ESP32
   fallback_clock.begin();
 #endif

examples/simple_room_server/main.cpp

@@ -726,6 +726,11 @@ void setup() {
   delay(1000);
 
   board.begin();
+
+#ifdef ESP32_CPU_FREQ
+  setCpuFrequencyMhz(ESP32_CPU_FREQ);
+#endif
+
 #ifdef ESP32
   fallback_clock.begin();
 #endif

examples/simple_secure_chat/main.cpp

@@ -566,6 +566,11 @@ void setup() {
   Serial.begin(115200);
 
   board.begin();
+
+#ifdef ESP32_CPU_FREQ
+  setCpuFrequencyMhz(ESP32_CPU_FREQ);
+#endif
+
 #ifdef SX126X_DIO3_TCXO_VOLTAGE
   float tcxo = SX126X_DIO3_TCXO_VOLTAGE;
 #else

platformio.ini

@@ -126,6 +126,7 @@ build_flags =
   -D SX126X_DIO3_TCXO_VOLTAGE=1.8
   -D SX126X_CURRENT_LIMIT=130.0f  ; for best TX power!
   -D SX126X_RX_BOOSTED_GAIN=true
+  -D ESP32_CPU_FREQ=240
 build_src_filter = ${esp32_base.build_src_filter}
 lib_deps =
   ${esp32_base.lib_deps}