From eed15e48d68d10426e015515ec4143849739f2de Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Fri, 11 Feb 2011 19:29:46 -0500
Subject: Changes to optimized digitalWrte(), etc.

Factoring out the implementation of digitalWrite(), digitalRead(), and pinMode() into macros that can either be inlined (for constant pin numbers) or executed within a function (non-constant pins).  Removing testing for timers on pins in digitalWrite(), digitalRead(), and pinMode().  Moving pin to port macros from pins_arduino.h to wiring.h.
---
 cores/arduino/wiring_digital.c | 76 +++---------------------------------------
 1 file changed, 4 insertions(+), 72 deletions(-)

(limited to 'cores/arduino/wiring_digital.c')

diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c
index 95666b1..9671045 100755
--- a/cores/arduino/wiring_digital.c
+++ b/cores/arduino/wiring_digital.c
@@ -27,28 +27,9 @@
 #include "wiring_private.h"
 #include "pins_arduino.h"
 
-void pinMode_lookup(uint8_t pin, uint8_t mode)
+void pinMode_lookup(uint8_t pin, uint8_t val)
 {
-	uint8_t bit = digitalPinToBitMask(pin);
-	uint8_t port = digitalPinToPort(pin);
-	volatile uint8_t *reg;
-
-	if (port == NOT_A_PIN) return;
-
-	// JWS: can I let the optimizer do this?
-	reg = portModeRegister(port);
-
-	if (mode == INPUT) { 
-		uint8_t oldSREG = SREG;
-                cli();
-		*reg &= ~bit;
-		SREG = oldSREG;
-	} else {
-		uint8_t oldSREG = SREG;
-                cli();
-		*reg |= bit;
-		SREG = oldSREG;
-	}
+	pinMode_implementation(pin, val);
 }
 
 // Forcing this inline keeps the callers from having to push their own stuff
@@ -121,61 +102,12 @@ static void turnOffPWM(uint8_t timer)
 	}
 }
 
-void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit)
-{
-	uint8_t oldSREG = SREG;
-	cli();
-	*out |= bit;
-	SREG=oldSREG;
-}
-
-void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit)
-{
-	uint8_t oldSREG = SREG;
-	cli();
-	*out &= bit; // NOTE - no inversion here, invert before calling!!!
-	SREG=oldSREG;
-}
-
 void digitalWrite_lookup(uint8_t pin, uint8_t val)
 {
-	uint8_t timer = digitalPinToTimer(pin);
-	uint8_t bit = digitalPinToBitMask(pin);
-	uint8_t port = digitalPinToPort(pin);
-	volatile uint8_t *out;
-
-	if (port == NOT_A_PIN) return;
-
-	// If the pin that support PWM output, we need to turn it off
-	// before doing a digital write.
-	if (timer != NOT_ON_TIMER) turnOffPWM(timer);
-
-	out = portOutputRegister(port);
-
-	uint8_t oldSREG = SREG;
-	cli();
-
-	if (val == LOW) {
-		*out &= ~bit;
-	} else {
-		*out |= bit;
-	}
-
-	SREG = oldSREG;
+	digitalWrite_implementation(pin, val);
 }
 
 int digitalRead_lookup(uint8_t pin)
 {
-	uint8_t timer = digitalPinToTimer(pin);
-	uint8_t bit = digitalPinToBitMask(pin);
-	uint8_t port = digitalPinToPort(pin);
-
-	if (port == NOT_A_PIN) return LOW;
-
-	// If the pin that support PWM output, we need to turn it off
-	// before getting a digital reading.
-	if (timer != NOT_ON_TIMER) turnOffPWM(timer);
-
-	if (*portInputRegister(port) & bit) return HIGH;
-	return LOW;
+	digitalRead_implementation(pin);
 }
-- 
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