Touch Sensor IDF Refactoring

cores/esp32/esp32-hal-touch.h

@@ -24,8 +24,21 @@
 extern "C" {
 #endif
 
+#include "soc/soc_caps.h"
 #include "esp32-hal.h"
 
+#if SOC_TOUCH_SENSOR_NUM > 0
+
+#if !defined(SOC_TOUCH_VERSION_1) && !defined(SOC_TOUCH_VERSION_2)
+#error Touch IDF driver Not supported!
+#endif
+
+#if SOC_TOUCH_VERSION_1 // ESP32
+typedef uint16_t touch_value_t;
+#elif SOC_TOUCH_VERSION_2 // ESP32S2 ESP32S3
+typedef uint32_t touch_value_t;
+#endif
+
 /*
  * Set cycles that measurement operation takes
  * The result from touchRead, threshold and detection
@@ -40,17 +53,44 @@ void touchSetCycles(uint16_t measure, uint16_t sleep);
  * You can use this method to chose a good threshold value
  * to use as value for touchAttachInterrupt
  * */
-uint16_t touchRead(uint8_t pin);
+touch_value_t touchRead(uint8_t pin);
 
 /*
- * Set function to be called if touch pad value falls
- * below the given threshold. Use touchRead to determine
- * a proper threshold between touched and untouched state
+ * Set function to be called if touch pad value falls (ESP32)
+ * below the given threshold / rises (ESP32-S2/S3) by given increment (threshold). 
+ * Use touchRead to determine a proper threshold between touched and untouched state
  * */
-void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold);
+void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), touch_value_t threshold);
+void touchAttachInterruptArg(uint8_t pin, void (*userFunc)(void*), void *arg, touch_value_t threshold);
+void touchDetachInterrupt(uint8_t pin);
+
+/*
+ * Specific functions to ESP32 
+ * Tells the driver if it shall activate the ISR if the sensor is Lower or Higher than the Threshold
+ * Default if Lower.
+ **/
+
+#if SOC_TOUCH_VERSION_1     // Only for ESP32 SoC
+void touchInterruptSetThresholdDirection(bool mustbeLower);
+#endif
+
+
+/*
+ * Specific functions to ESP32-S2 and ESP32-S3
+ * Returns true when the latest ISR status for the Touchpad is that it is touched (Active)
+ * and false when the Touchpad is untoouched (Inactive)
+ * This function can be used in conjunction with ISR User callback in order to take action 
+ * as soon as the touchpad is touched and/or released
+ **/
+
+#if SOC_TOUCH_VERSION_2     // Only for ESP32S2 and ESP32S3
+// returns true if touch pad has been and continues pressed and false otherwise 
+bool touchInterruptGetLastStatus(uint8_t pin);
+#endif
+
+#endif // SOC_TOUCH_SENSOR_NUM > 0
 
 #ifdef __cplusplus
 }
 #endif
-
 #endif /* MAIN_ESP32_HAL_TOUCH_H_ */

libraries/ESP32/examples/Touch/TouchButton/TouchButton.ino

@@ -0,0 +1,46 @@
+/*
+
+This is an example how to use Touch Intrrerupts
+The sketh will tell when it is touched and then relesased as like a push-button
+
+This method based on touchInterruptSetThresholdDirection() is only available for ESP32
+*/
+
+#include "Arduino.h"
+
+int threshold = 40;
+bool touchActive = false;
+bool lastTouchActive = false;
+bool testingLower = true;
+
+void gotTouchEvent(){
+  if (lastTouchActive != testingLower) {
+    touchActive = !touchActive;
+    testingLower = !testingLower;
+    // Touch ISR will be inverted: Lower <--> Higher than the Threshold after ISR event is noticed
+    touchInterruptSetThresholdDirection(testingLower);
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000); // give me time to bring up serial monitor
+  Serial.println("ESP32 Touch Interrupt Test");
+  touchAttachInterrupt(T2, gotTouchEvent, threshold);
+
+  // Touch ISR will be activated when touchRead is lower than the Threshold
+  touchInterruptSetThresholdDirection(testingLower);
+}
+
+void loop(){
+  if(lastTouchActive != touchActive){
+    lastTouchActive = touchActive;
+    if (touchActive) {
+      Serial.println("  ---- Touch was Pressed");
+    } else {
+      Serial.println("  ---- Touch was Released");
+    }
+  }
+  Serial.printf("T2 pin2 = %d \n", touchRead(T2));
+  delay(125);
+}

libraries/ESP32/examples/Touch/TouchButtonV2/TouchButtonV2.ino

@@ -0,0 +1,53 @@
+/*
+
+This is an example how to use Touch Intrrerupts
+The sketh will tell when it is touched and then relesased as like a push-button
+
+This method based on touchInterruptGetLastStatus() is only available for ESP32 S2 and S3
+*/
+
+#include "Arduino.h"
+
+int threshold = 1500;   // ESP32S2 
+bool touch1detected = false;
+bool touch2detected = false;
+
+void gotTouch1() {
+  touch1detected = true;
+}
+
+void gotTouch2() {
+  touch2detected = true;
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000); // give me time to bring up serial monitor
+
+  Serial.println("\n ESP32 Touch Interrupt Test\n");
+  touchAttachInterrupt(T1, gotTouch1, threshold); 
+  touchAttachInterrupt(T2, gotTouch2, threshold);
+}
+
+void loop() {
+  static uint32_t count = 0;
+
+  if (touch1detected) {
+    touch1detected = false;
+    if (touchInterruptGetLastStatus(T1)) {
+        Serial.println(" --- T1 Touched");
+    } else {
+        Serial.println(" --- T1 Released");
+    }
+  }
+  if (touch2detected) {
+    touch2detected = false;
+    if (touchInterruptGetLastStatus(T2)) {
+        Serial.println(" --- T2 Touched");
+    } else {
+        Serial.println(" --- T2 Released");
+    }
+  }
+
+  delay(80);
+}