From 584dece7b0c982de8731f7400c94b5034aef89e7 Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Sat, 7 Nov 2009 17:05:21 +0000
Subject: Moving things around.

---
 core/wiring_digital.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100755 core/wiring_digital.c

(limited to 'core/wiring_digital.c')

diff --git a/core/wiring_digital.c b/core/wiring_digital.c
new file mode 100755
index 0000000..1cdbf6c
--- /dev/null
+++ b/core/wiring_digital.c
@@ -0,0 +1,111 @@
+/*
+  wiring_digital.c - digital input and output functions
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2005-2006 David A. Mellis
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+
+  $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
+*/
+
+#include "wiring_private.h"
+#include "pins_arduino.h"
+
+void pinMode(uint8_t pin, uint8_t mode)
+{
+	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) *reg &= ~bit;
+	else *reg |= bit;
+}
+
+// Forcing this inline keeps the callers from having to push their own stuff
+// on the stack. It is a good performance win and only takes 1 more byte per
+// user than calling. (It will take more bytes on the 168.)
+//
+// But shouldn't this be moved into pinMode? Seems silly to check and do on
+// each digitalread or write.
+//
+static inline void turnOffPWM(uint8_t timer) __attribute__ ((always_inline));
+static inline void turnOffPWM(uint8_t timer)
+{
+	if (timer == TIMER1A) cbi(TCCR1A, COM1A1);
+	if (timer == TIMER1B) cbi(TCCR1A, COM1B1);
+
+#if defined(__AVR_ATmega8__)
+	if (timer == TIMER2) cbi(TCCR2, COM21);
+#else
+	if (timer == TIMER0A) cbi(TCCR0A, COM0A1);
+	if (timer == TIMER0B) cbi(TCCR0A, COM0B1);
+	if (timer == TIMER2A) cbi(TCCR2A, COM2A1);
+	if (timer == TIMER2B) cbi(TCCR2A, COM2B1);
+#endif
+
+#if defined(__AVR_ATmega1280__)
+	if (timer == TIMER3A) cbi(TCCR3A, COM3A1);
+	if (timer == TIMER3B) cbi(TCCR3A, COM3B1);
+	if (timer == TIMER3C) cbi(TCCR3A, COM3C1);
+	if (timer == TIMER4A) cbi(TCCR4A, COM4A1);
+	if (timer == TIMER4B) cbi(TCCR4A, COM4B1);
+	if (timer == TIMER4C) cbi(TCCR4A, COM4C1);
+	if (timer == TIMER5A) cbi(TCCR5A, COM5A1);
+	if (timer == TIMER5B) cbi(TCCR5A, COM5B1);
+	if (timer == TIMER5C) cbi(TCCR5A, COM5C1);
+#endif
+}
+
+void digitalWrite(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);
+
+	if (val == LOW) *out &= ~bit;
+	else *out |= bit;
+}
+
+int digitalRead(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;
+}
-- 
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