From 462d865fc97c522303fe51485b9f198061e16475 Mon Sep 17 00:00:00 2001
From: proddy <paul@derbyshire.nl>
Date: Sat, 18 Jan 2025 16:08:26 +0100
Subject: [PATCH] implement CPU temp for ESP32

---
 src/core/system.cpp |  5 ++++-
 src/core/system.h   | 11 ++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/core/system.cpp b/src/core/system.cpp
index 44e51453f..18d00f245 100644
--- a/src/core/system.cpp
+++ b/src/core/system.cpp
@@ -789,7 +789,10 @@ void System::system_check() {
         last_system_check_ = uuid::get_uptime();
 
 #ifndef EMSESP_STANDALONE
-#if CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2
+#if defined(CONFIG_IDF_TARGET_ESP32)
+    uint8_t raw = temprature_sens_read();
+    temperature_ = (raw - 32) / 1.8f; // convert to Celsius
+#elif CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2
 #if ESP_IDF_VERSION_MAJOR < 5
         temp_sensor_read_celsius(&temperature_);
 #else
diff --git a/src/core/system.h b/src/core/system.h
index 35db0cd83..746803a35 100644
--- a/src/core/system.h
+++ b/src/core/system.h
@@ -39,7 +39,12 @@
 #include <uuid/log.h>
 #include <PButton.h>
 
-#if CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2
+#if defined(CONFIG_IDF_TARGET_ESP32)
+// there is no official API available on the original ESP32
+extern "C" {
+uint8_t temprature_sens_read();
+}
+#elif CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2
 #if ESP_IDF_VERSION_MAJOR < 5
 #include "driver/temp_sensor.h"
 #else
@@ -331,7 +336,7 @@ class System {
         test_set_all_active_ = n;
     }
 
-#if CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2
+#if CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32
     float temperature() {
         return temperature_;
     }
@@ -435,8 +440,8 @@ class System {
 #if ESP_IDF_VERSION_MAJOR >= 5
     temperature_sensor_handle_t temperature_handle_ = NULL;
 #endif
-    float temperature_ = 0;
 #endif
+    float temperature_ = 0;
 };
 
 } // namespace emsesp