v2.0.0 Add support for ESP32S2 and update ESP-IDF to 4.4 (#4996)

This is very much still work in progress and much more will change before the final 2.0.0

Some APIs have changed. New libraries have been added. LittleFS included.

Co-authored-by: Seon Rozenblum <seonr@3sprockets.com>
Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>
Co-authored-by: geeksville <kevinh@geeksville.com>
Co-authored-by: Mike Dunston <m_dunston@comcast.net>
Co-authored-by: Unexpected Maker <seon@unexpectedmaker.com>
Co-authored-by: Seon Rozenblum <seonr@3sprockets.com>
Co-authored-by: microDev <70126934+microDev1@users.noreply.github.com>
Co-authored-by: tobozo <tobozo@users.noreply.github.com>
Co-authored-by: bobobo1618 <bobobo1618@users.noreply.github.com>
Co-authored-by: lorol <lorolouis@gmail.com>
Co-authored-by: geeksville <kevinh@geeksville.com>
Co-authored-by: Limor "Ladyada" Fried <limor@ladyada.net>
Co-authored-by: Sweety <switi.mhaiske@espressif.com>
Co-authored-by: Loick MAHIEUX <loick111@gmail.com>
Co-authored-by: Larry Bernstone <lbernstone@gmail.com>
Co-authored-by: Valerii Koval <valeros@users.noreply.github.com>
Co-authored-by: 快乐的我531 <2302004040@qq.com>
Co-authored-by: chegewara <imperiaonline4@gmail.com>
Co-authored-by: Clemens Kirchgatterer <clemens@1541.org>
Co-authored-by: Aron Rubin <aronrubin@gmail.com>
Co-authored-by: Pete Lewis <601236+lewispg228@users.noreply.github.com>

libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino

@@ -1,3 +1,5 @@
+//Disable Example for now
+#if 0
 #include "esp_camera.h"
 #include <WiFi.h>
 
@@ -110,3 +112,7 @@ void loop() {
   // put your main code here, to run repeatedly:
   delay(10000);
 }
+#else
+void setup(){}
+void loop(){}
+#endif

libraries/ESP32/examples/Camera/CameraWebServer/app_httpd.cpp

@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+#if 0
 #include "esp_http_server.h"
 #include "esp_timer.h"
 #include "esp_camera.h"
@@ -56,11 +57,11 @@ static ra_filter_t ra_filter;
 httpd_handle_t stream_httpd = NULL;
 httpd_handle_t camera_httpd = NULL;
 
-static mtmn_config_t mtmn_config = {0};
+static mtmn_config_t mtmn_config;
 static int8_t detection_enabled = 0;
 static int8_t recognition_enabled = 0;
 static int8_t is_enrolling = 0;
-static face_id_list id_list = {0};
+static face_id_list id_list;
 
 static ra_filter_t * ra_filter_init(ra_filter_t * filter, size_t sample_size){
     memset(filter, 0, sizeof(ra_filter_t));
@@ -660,3 +661,4 @@ void startCameraServer(){
         httpd_register_uri_handler(stream_httpd, &stream_uri);
     }
 }
+#endif

libraries/ESP32/examples/GPIO/FunctionalInterrupt/FunctionalInterrupt.ino

@@ -15,7 +15,7 @@ public:
 		detachInterrupt(PIN);
 	}
 
-	void IRAM_ATTR isr() {
+	void ARDUINO_ISR_ATTR isr() {
 		numberKeyPresses += 1;
 		pressed = true;
 	}

libraries/ESP32/examples/GPIO/GPIOInterrupt/GPIOInterrupt.ino

@@ -9,13 +9,13 @@ struct Button {
 Button button1 = {23, 0, false};
 Button button2 = {18, 0, false};
 
-void IRAM_ATTR isr(void* arg) {
+void ARDUINO_ISR_ATTR isr(void* arg) {
     Button* s = static_cast<Button*>(arg);
     s->numberKeyPresses += 1;
     s->pressed = true;
 }
 
-void IRAM_ATTR isr() {
+void ARDUINO_ISR_ATTR isr() {
     button2.numberKeyPresses += 1;
     button2.pressed = true;
 }

libraries/ESP32/examples/HallSensor/HallSensor.ino

@@ -1,7 +1,6 @@
 //Simple sketch to access the internal hall effect detector on the esp32.
 //values can be quite low. 
 //Brian Degger / @sctv  
-
 int val = 0;
 void setup() {
   Serial.begin(9600);

libraries/ESP32/examples/ResetReason/ResetReason.ino

@@ -12,7 +12,17 @@
 *  Evandro Luis Copercini - 2017
 */
 
-#include <rom/rtc.h>
+#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
+#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
+#include "esp32/rom/rtc.h"
+#elif CONFIG_IDF_TARGET_ESP32S2
+#include "esp32s2/rom/rtc.h"
+#else 
+#error Target CONFIG_IDF_TARGET is not supported
+#endif
+#else // ESP32 Before IDF 4.0
+#include "rom/rtc.h"
+#endif
 
 #define uS_TO_S_FACTOR 1000000  /* Conversion factor for micro seconds to seconds */
 

libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino

@@ -18,7 +18,7 @@ portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
 volatile uint32_t isrCounter = 0;
 volatile uint32_t lastIsrAt = 0;
 
-void IRAM_ATTR onTimer(){
+void ARDUINO_ISR_ATTR onTimer(){
   // Increment the counter and set the time of ISR
   portENTER_CRITICAL_ISR(&timerMux);
   isrCounter++;

libraries/ESP32/examples/Timer/WatchdogTimer/WatchdogTimer.ino

@@ -4,7 +4,7 @@ const int button = 0;         //gpio to use to trigger delay
 const int wdtTimeout = 3000;  //time in ms to trigger the watchdog
 hw_timer_t *timer = NULL;
 
-void IRAM_ATTR resetModule() {
+void ARDUINO_ISR_ATTR resetModule() {
   ets_printf("reboot\n");
   esp_restart();
 }

libraries/ESP32/examples/Touch/TouchRead/TouchRead.ino

@@ -10,6 +10,6 @@ void setup()
 
 void loop()
 {
-  Serial.println(touchRead(T0));  // get value using T0
+  Serial.println(touchRead(T1));  // get value using T0
   delay(1000);
 }