Added additional Atomic Macros

Author: wizard97

RingBuf.h

@@ -1,7 +1,49 @@
 #ifndef RINGBUG_FIFO_H
 #define RINGBUF_FIFO_H
 
-#include <Arduino.h>
+#ifdef ARDUINO
+    #include <Arduino.h>
+#else
+    #include <stdint.h>
+#endif
+
+#ifdef ARDUINO
+
+    #if defined(ARDUINO_ARCH_AVR)
+        #include <util/atomic.h>
+        #define RB_ATOMIC_START ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+        #define RB_ATOMIC_END }
+
+
+    #elif defined(ARDUINO_ARCH_ESP8266)
+        #ifndef __STRINGIFY
+            #define __STRINGIFY(a) #a
+        #endif
+
+        #ifndef xt_rsil
+            #define xt_rsil(level) (__extension__({uint32_t state; __asm__ __volatile__("rsil %0," __STRINGIFY(level) : "=a" (state)); state;}))
+        #endif
+
+        #ifndef xt_wsr_ps
+            #define xt_wsr_ps(state)  __asm__ __volatile__("wsr %0,ps; isync" :: "a" (state) : "memory")
+        #endif
+
+        #define RB_ATOMIC_START do { uint32_t _savedIS = xt_rsil(15) ;
+        #define RB_ATOMIC_END xt_wsr_ps(_savedIS) ;} while(0);
+
+    #else
+        #define RB_ATOMIC_START {
+        #define RB_ATOMIC_END }
+        #warning “This library only fully supports AVR and ESP8266 Boards.”
+        #warning "Operations on the buffer in ISRs are not safe!"
+    #endif
+
+#else
+    #define RB_ATOMIC_START {
+    #define RB_ATOMIC_END }
+    #warning "Operations on the buffer in ISRs are not safe!"
+    #warning "Impliment RB_ATOMIC_START and RB_ATOMIC_END macros for safe ISR operation!"
+#endif
 
 template <typename Type, uint16_t MaxElements>