From a706d905987a44ff1e6252ffc23f448a21e2a88a Mon Sep 17 00:00:00 2001
From: Florent <florent@frizoncorrea.fr>
Date: Sun, 9 Mar 2025 15:49:35 +0100
Subject: [PATCH] Add an ESP32_CPU_FREQ build flag to lower freq

---
 examples/companion_radio/main.cpp    | 4 ++++
 examples/simple_repeater/main.cpp    | 4 ++++
 examples/simple_room_server/main.cpp | 5 +++++
 examples/simple_secure_chat/main.cpp | 5 +++++
 platformio.ini                       | 1 +
 5 files changed, 19 insertions(+)

diff --git a/examples/companion_radio/main.cpp b/examples/companion_radio/main.cpp
index 833e41d8..ac0b3111 100644
--- a/examples/companion_radio/main.cpp
+++ b/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
diff --git a/examples/simple_repeater/main.cpp b/examples/simple_repeater/main.cpp
index 5743647b..e9f6d480 100644
--- a/examples/simple_repeater/main.cpp
+++ b/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
diff --git a/examples/simple_room_server/main.cpp b/examples/simple_room_server/main.cpp
index 285d59c6..5f7d577a 100644
--- a/examples/simple_room_server/main.cpp
+++ b/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
diff --git a/examples/simple_secure_chat/main.cpp b/examples/simple_secure_chat/main.cpp
index 951d51dc..f34f025f 100644
--- a/examples/simple_secure_chat/main.cpp
+++ b/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
diff --git a/platformio.ini b/platformio.ini
index 02ce189c..6cb473f3 100644
--- a/platformio.ini
+++ b/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}