Revert "Changes to optimized digitalWrte(), etc."

This reverts commit aa1f1cbda9d6bb52785f98b40746920853d6579b.

1 files changed, 40 insertions, 108 deletions

diff --git a/cores/arduino/wiring.h b/cores/arduino/wiring.h
index 66ce2f7..433c87e 100755
--- a/cores/arduino/wiring.h
+++ b/cores/arduino/wiring.h
@@ -130,136 +130,68 @@ void detachInterrupt(uint8_t);
 void setup(void);
 void loop(void);
 
-INLINED uint8_t digitalPinToPort(uint8_t pin) {
-	if (__builtin_constant_p(pin))
-		return inlined_digitalPinToPort(pin);
-	else
-		return pgm_read_byte( digital_pin_to_port_PGM + pin );
-}
-
-INLINED uint8_t digitalPinToBitMask(uint8_t pin) {
-	if (__builtin_constant_p(pin))
-		return inlined_digitalPinToBitMask(pin);
-	else
-		return pgm_read_byte( digital_pin_to_bit_mask_PGM + pin );
-}
-
-INLINED uint8_t digitalPinToTimer(uint8_t pin) {
-	if (__builtin_constant_p(pin))
-		return inlined_digitalPinToTimer(pin);
-	else
-		return pgm_read_byte( digital_pin_to_timer_PGM + pin );
-}
-
-INLINED volatile uint8_t *portOutputRegister(uint8_t index) {
-	if (__builtin_constant_p(index))
-		return inlined_portOutputRegister(index);
-	else
-		return (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + index ) );
-}
-
-INLINED volatile uint8_t* portInputRegister(uint8_t index) {
-	if (__builtin_constant_p(index))
-		return inlined_portInputRegister(index);
-	else
-		return (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + index) );
-}
-
-INLINED volatile uint8_t* portModeRegister(uint8_t index) {
-	if (__builtin_constant_p(index))
-		return inlined_portModeRegister(index);
-	else
-		return (volatile uint8_t *)( pgm_read_word( port_to_mode_PGM + index) );
-}
-
 /*
  * Check if a given pin requires locking.
  * When accessing lower 32 IO ports we can use SBI/CBI instructions, which are atomic. However
  * other IO ports require load+modify+store and we need to make them atomic by disabling
  * interrupts.
  */
-INLINED int registerWriteNeedsLocking(volatile uint8_t *reg)
+INLINED int portWriteNeedsLocking(uint8_t pin)
 {
 	/* SBI/CBI instructions only work on lower 32 IO ports */
-	if (reg > (volatile uint8_t*)&_SFR_IO8(0x1F)) {
+	if (inlined_portOutputRegister(inlined_digitalPinToPort(pin)) > (volatile uint8_t*)&_SFR_IO8(0x1F)) {
 		return 1;
 	}
 	return 0;
 }
 
-#define digitalWrite_implementation(pin, value)\
-do {\
-	uint8_t oldSREG;\
-	uint8_t bit = digitalPinToBitMask(pin);\
-	uint8_t port = digitalPinToPort(pin);\
-	volatile uint8_t *reg = portOutputRegister(port);\
-\
-	if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\
-		oldSREG = SREG;\
-		cli();\
-	}\
-\
-	if (value == LOW) {\
-		*reg &= ~bit;\
-	} else {\
-		*reg |= bit;\
-	}\
-\
-	if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\
-		SREG = oldSREG;\
-	}\
-} while(0)
-	
+/*
+ * These functions will perform OR/AND on a given register, and are atomic.
+ */
+extern void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit);
+extern void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit);
+
 INLINED void digitalWrite(uint8_t pin, uint8_t value)
 {
-	if (__builtin_constant_p(pin)) digitalWrite_implementation(pin, value);
-	else digitalWrite_lookup(pin, value);
+	if (__builtin_constant_p(pin)) {
+		if (portWriteNeedsLocking(pin)) {
+			if (value==LOW) {
+				__digitalWriteAND_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),~inlined_digitalPinToBitMask(pin));
+			} else {
+				__digitalWriteOR_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),inlined_digitalPinToBitMask(pin));
+			}
+		} else {
+			if (value==LOW) {
+				*inlined_portOutputRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin));
+			} else {
+				*inlined_portOutputRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin);
+			}
+		}
+	} else {
+		digitalWrite_lookup(pin,value);
+	}
 }
 
-#define pinMode_implementation(pin, value)\
-do {\
-	uint8_t bit = digitalPinToBitMask(pin);\
-	uint8_t oldSREG;\
-	uint8_t port = digitalPinToPort(pin);\
-	volatile uint8_t *reg = portModeRegister(port);\
-\
-	if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\
-		oldSREG = SREG;\
-		cli();\
-	}\
-\
-	if (value == INPUT) { \
-		*reg &= ~bit;\
-	} else {\
-		*reg |= bit;\
-	}\
-\
-	if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\
-		SREG = oldSREG;\
-	}\
-} while(0)
-
-INLINED void pinMode(uint8_t pin, uint8_t value)
+INLINED void pinMode(uint8_t pin, uint8_t mode)
 {
-	if (__builtin_constant_p(pin)) pinMode_implementation(pin, value);
-	else pinMode_lookup(pin, value);
+	if (__builtin_constant_p(pin)) {
+		if (mode==INPUT) {
+			*inlined_portModeRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin));
+		} else {
+			*inlined_portModeRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin);
+		}
+	} else {
+		pinMode_lookup(pin,mode);
+	}
 }
 
-#define digitalRead_implementation(pin)\
-do {\
-	uint8_t bit = digitalPinToBitMask(pin);\
-	uint8_t port = digitalPinToPort(pin);\
-\
-	if (port == NOT_A_PIN) return LOW;\
-\
-	if (*portInputRegister(port) & bit) return HIGH;\
-	return LOW;\
-} while(0)
-
 INLINED int digitalRead(uint8_t pin)
 {
-	if (__builtin_constant_p(pin)) digitalRead_implementation(pin);
-	else return digitalRead_lookup(pin);
+	if (__builtin_constant_p(pin)) {
+		return !! *inlined_portInputRegister(inlined_digitalPinToPort(pin));
+	} else {
+		return digitalRead_lookup(pin);
+	}
 }