use avr-libc atomic stuff instead of manual SREG manipulation

analog.c

@@ -1,6 +1,7 @@
 #include "analog.h"
 
 #include	<avr/interrupt.h>
+#include	<util/atomic.h>
 
 #ifndef	ANALOG_MASK
 	#warning	define ANALOG_MASK as a bitmask of all the analog channels you wish to use
@@ -54,16 +55,12 @@ ISR(ADC_vect) {
 }
 
 uint16_t	analog_read(uint8_t channel) {
-	uint8_t sreg;
 	uint16_t r;
-	// save interrupt flag
-	sreg = SREG;
-	// disable interrupts
-	cli();
-	// atomic 16-bit copy
-	r = adc_result[channel];
-	// restore interrupt flag
-	SREG = sreg;
+
+	ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+		// atomic 16-bit copy
+		r = adc_result[channel];
+	}
 
 	// re-enable analog read loop so we can get new values
 	ADCSRA |= MASK(ADIE);

dda_queue.c

@@ -1,8 +1,12 @@
 #include	"dda_queue.h"
 
 #include	<string.h>
-#ifndef SIMULATION
+
+#ifdef SIMULATION
+	#include	"simulation.h"
+#else
 	#include	<avr/interrupt.h>
+	#include	<util/atomic.h>
 #endif
 
 #include	"config.h"
@@ -110,16 +114,9 @@ void print_queue() {
 }
 
 void queue_flush() {
-	// save interrupt flag
-	uint8_t sreg = SREG;
-
-	// disable interrupts
-	cli();
-
-	// flush queue
-	mb_tail = mb_head;
-	movebuffer[mb_head].live = 0;
-
-	// restore interrupt flag
-	SREG = sreg;
+	ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+		// flush queue
+		mb_tail = mb_head;
+		movebuffer[mb_head].live = 0;
+	}
 }

gcode_process.c

@@ -13,6 +13,7 @@
 #include	"heater.h"
 #include	"timer.h"
 #include	"sersendf.h"
+#include	"debug.h"
 
 /****************************************************************************
 *                                                                           *

simulation.h

@@ -77,5 +77,8 @@ void sim_info(const char fmt[], ...);
 void sim_error(const char msg[]);
 void sim_assert(bool cond, const char msg[]);
 
+#define	ATOMIC_BLOCK(n)			if (n)
+#define	ATOMIC_RESTORESTATE	1
+
 #endif /* _SIMULATION_H */