fixed avr warning

Author: glutio

examples/TaskBlink/TaskBlink.ino

@@ -1,4 +1,4 @@
-#include <Taskfun.h>
+#include "Taskfun.h"
 
 // synchronize access to this shared global variable
 SyncVar<bool> _on;
@@ -18,7 +18,7 @@ void Off(int) {
   while (1) {
     if (!_on) {
       digitalWrite(LED_BUILTIN, LOW);
-      delay(1000);
+      delay(1000);  
       _on = true;
     }
   } 

src/BTaskSwitcherAVR.cpp

@@ -51,7 +51,9 @@ bool BTaskSwitcher::disable() {
   return sreg & _BV(SREG_I);
 }
 
-void __attribute__((naked)) BTaskSwitcher::switch_context() {
+// not a static class function to avoid compiler warning
+void __attribute__((naked)) avr_switch_context()
+{
   asm volatile("push r0");
   asm volatile("in r0, __SREG__");
   asm volatile("push r0");
@@ -90,7 +92,7 @@ void __attribute__((naked)) BTaskSwitcher::switch_context() {
   asm volatile("in r25, __SP_H__");
   asm volatile("call %x0"
                :
-               : "i"(swap_stack));
+               : "i"(BTaskSwitcher::swap_stack));
   asm volatile("out __SP_L__, r24");
   asm volatile("out __SP_H__, r25");
   asm volatile("pop r31");
@@ -127,7 +129,11 @@ void __attribute__((naked)) BTaskSwitcher::switch_context() {
   asm volatile("pop r0");
   asm volatile("out __SREG__, r0");
   asm volatile("pop r0");
-  asm volatile("ret");
+  asm volatile("ret");  
+}
+
+void BTaskSwitcher::switch_context() {
+  avr_switch_context();
 }
 
 void BTaskSwitcher::init_task(BTaskInfoBase* taskInfo, BTaskWrapper wrapper) {

src/BTaskSwitcherAVR.h

@@ -4,6 +4,7 @@
   extern "C" void TIMER0_COMPA_vect();
 
 #define __BTASKSWITCHER_ARCH_CLASS__ \
+  friend void avr_switch_context(); \
   friend void ::TIMER0_COMPA_vect();
 
 #endif