Support Update

Added support for ESP8266

Author: biomurph

src/PulseSensorPlayground.cpp

@@ -496,6 +496,12 @@ bool PulseSensorPlayground::setupInterrupt(){
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_ESP8266)
+        ESP8266Timer sampleTimer;
+    sampleTimer.setFrequency(500,onInterrupt);
+    sampleTimer.restartTimer();
+  #endif
+
   #if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_ARCH_SAMD)
     sampleTimer.attachInterrupt(SAMPLE_RATE_500HZ, onInterrupt);
     result = true;
@@ -575,6 +581,11 @@ bool PulseSensorPlayground::enableInterrupt(){
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_ESP8266)
+    sampleTimer.restartTimer();
+    result = true;
+  #endif
+
   #if defined(ARDUINO_ARCH_SAM)
     sampleTimer.start(2000);
     result = true;
@@ -652,6 +663,11 @@ bool PulseSensorPlayground::disableInterrupt(){
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_ESP8266)
+    sampleTimer.stopTimer();
+    result = true;
+  #endif
+
   #if defined(ARDUINO_ARCH_SAM)
     sampleTimer.stop();
     result = true;

src/utility/SelectTimer.h

@@ -38,7 +38,7 @@
 				Any board with RP2040
 
 		ARDUINO_NRF52_ADAFRUIT
-			nRF52840 Bluetooth
+			nRF52840 Bluetooth Family
 				Adafruit and Seeed nRF52 boards (non EMBED boards yet!)
 
 		ARDUINO_ARCH_ESP32
@@ -52,6 +52,10 @@
 			ATSAMD51 Core-M4
 				Adafruit Meather M4
 
+		ARDUINO_ARCH_ESP8266
+			ESP8266 Family
+			Adafruit Feather Huzzah
+
 
 */
 
@@ -61,7 +65,7 @@
 
 #if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_RENESAS) || defined(ARDUINO_ARCH_RP2040)\
 || defined(ARDUINO_SAM_DUE) || defined(ARDUINO_NRF52_ADAFRUIT) || defined(ARDUINO_ARCH_ESP32)\
-|| defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_ARCH_SAMD)
+|| defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_ARCH_SAMD) || defined(ARDUINO_ARCH_ESP8266)
 #define USE_HARDWARE_TIMER true
 			// #warning "Using hardware timer to sample PulseSensor."
 #else
@@ -70,12 +74,12 @@
 #endif
 
 // Macros to link to interrupt disable/enable only if they exist
-#ifndef ARDUINO_ARCH_AVR
-#define DISABLE_PULSE_SENSOR_INTERRUPTS
-#define ENABLE_PULSE_SENSOR_INTERRUPTS
-#else
+#if defined ARDUINO_ARCH_AVR
 #define DISABLE_PULSE_SENSOR_INTERRUPTS cli()
 #define ENABLE_PULSE_SENSOR_INTERRUPTS sei()
+#else
+#define DISABLE_PULSE_SENSOR_INTERRUPTS
+#define ENABLE_PULSE_SENSOR_INTERRUPTS
 #endif
 
 #endif // SELECT_TIMER include guard

src/utility/TimerHandler.h

@@ -181,6 +181,21 @@
         }
     #endif
 
+    #if defined(ARDUINO_ARCH_ESP8266)
+        /*
+            If you are using ESP8266, include the TimerInterrupt library
+            https://github.com/khoih-prog/ESP8266TimerInterrupt
+        */
+        #define USING_TIM_DIV16 true
+        #include "ESP8266TimerInterrupt.h"
+        
+        void IRAM_ATTR onInterrupt(){
+          PulseSensorPlayground::OurThis->onSampleTime();
+        }
+        ESP8266Timer sampleTimer;
+
+    #endif
+
     #if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_ARCH_SAMD)
         // These define's must be placed at the beginning before #include "SAMDTimerInterrupt.h"
         // _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4