From db79c2ee95e709d5436101871824023fa0bcedca Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Mon, 18 Sep 2017 17:47:06 +0800
Subject: [PATCH] Add api to get CPU temperature

Fixes: https://github.com/espressif/arduino-esp32/issues/563
Fixes: https://github.com/espressif/arduino-esp32/issues/625
Source:
https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchb
ook/ESP32_int_temp_sensor/ESP32_int_temp_sensor.ino
---
 cores/esp32/esp32-hal-misc.c | 9 +++++++++
 cores/esp32/esp32-hal.h      | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/cores/esp32/esp32-hal-misc.c b/cores/esp32/esp32-hal-misc.c
index ea943b37..bf4ee06e 100644
--- a/cores/esp32/esp32-hal-misc.c
+++ b/cores/esp32/esp32-hal-misc.c
@@ -23,6 +23,15 @@
 #include "esp_log.h"
 #include <sys/time.h>
 
+//Undocumented!!! Get chip temperature in Farenheit
+//Source: https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_int_temp_sensor/ESP32_int_temp_sensor.ino
+uint8_t temprature_sens_read();
+
+float temperatureRead()
+{
+    return (temprature_sens_read() - 32) / 1.8;
+}
+
 void yield()
 {
     vPortYield();
diff --git a/cores/esp32/esp32-hal.h b/cores/esp32/esp32-hal.h
index f6a51427..d6e5ca8c 100644
--- a/cores/esp32/esp32-hal.h
+++ b/cores/esp32/esp32-hal.h
@@ -61,6 +61,9 @@ void yield(void);
 #include "esp32-hal-bt.h"
 #include "esp_system.h"
 
+//returns chip temperature in Celsius
+float temperatureRead();
+
 unsigned long micros();
 unsigned long millis();
 void delay(uint32_t);