Merge pull request #200 from Makuna/esp8266

true noInterrupts() interrupts() support

Author: igrr

cores/esp8266/Arduino.h

@@ -124,8 +124,17 @@ void timer1_write(uint32_t ticks); //maximum ticks 8388607
 void ets_intr_lock();
 void ets_intr_unlock();
 
-#define interrupts() ets_intr_unlock();
-#define noInterrupts() ets_intr_lock();
+// level (0-15), 
+// level 15 will disable ALL interrupts, 
+// level 0 will disable most software interrupts
+//
+#define xt_disable_interrupts(state, level) __asm__ __volatile__("rsil %0," __STRINGIFY(level) "; esync; isync; dsync" : "=a" (state))
+#define xt_enable_interrupts(state)  __asm__ __volatile__("wsr %0,ps; esync" :: "a" (state) : "memory")
+
+extern uint32_t interruptsState;
+
+#define interrupts() xt_enable_interrupts(interruptsState)
+#define noInterrupts() xt_disable_interrupts(interruptsState, 15)
 
 #define clockCyclesPerMicrosecond() ( F_CPU / 1000000L )
 #define clockCyclesToMicroseconds(a) ( (a) / clockCyclesPerMicrosecond() )

cores/esp8266/Esp.h

@@ -95,8 +95,16 @@ class EspClass {
         FlashMode_t getFlashChipMode(void);
         uint32_t getFlashChipSizeByChipId(void);
 
+        inline uint32_t getCycleCount(void);
 };
 
+uint32_t EspClass::getCycleCount(void)
+{
+    uint32_t ccount;
+    __asm__ __volatile__("rsr %0,ccount":"=a" (ccount));
+    return ccount;
+}
+
 extern EspClass ESP;
 
 #endif //ESP_H

cores/esp8266/core_esp8266_wiring_digital.c

@@ -139,6 +139,9 @@ extern void __detachInterrupt(uint8_t pin) {
   }
 }
 
+// stored state for the noInterrupts/interrupts methods
+uint32_t interruptsState = 0;
+
 void initPins() {
   //Disable UART interrupts
   system_set_os_print(0);