From 34d55c304253fde0fc113f384f619171e3cf3167 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Tue, 7 Aug 2018 17:30:37 +0200
Subject: AVR GPIO: Add pullup support

---
 include/arch/arduino-nano/driver/gpio.h | 46 +++++++++++++++++++++++++++++++++
 src/arch/arduino-nano/driver/gpio.cc    | 13 ++++++++++
 2 files changed, 59 insertions(+)

diff --git a/include/arch/arduino-nano/driver/gpio.h b/include/arch/arduino-nano/driver/gpio.h
index 6acf977..1a2fbe0 100644
--- a/include/arch/arduino-nano/driver/gpio.h
+++ b/include/arch/arduino-nano/driver/gpio.h
@@ -58,6 +58,19 @@ class GPIO {
 				DDRD &= ~_BV(pin - 24);
 			}
 		}
+		inline void input(unsigned char const pin, unsigned char const pull) {
+			if (pin < 8) {
+			} else if (pin < 16) {
+				DDRB &= ~_BV(pin - 8);
+				PORTB |= _BV(pin - 8);
+			} else if (pin < 24) {
+				DDRC &= ~_BV(pin - 16);
+				PORTC |= _BV(pin - 16);
+			} else if (pin < 32) {
+				DDRD &= ~_BV(pin - 24);
+				PORTD |= _BV(pin - 24);
+			}
+		}
 		inline void output(unsigned char const pin) {
 			if (pin < 8) {
 			} else if (pin < 16) {
@@ -68,6 +81,19 @@ class GPIO {
 				DDRD |= _BV(pin - 24);
 			}
 		}
+		inline void output(unsigned char const pin, unsigned char const value) {
+			if (pin < 8) {
+			} else if (pin < 16) {
+				PORTB = value ? (PORTB | _BV(pin - 8)) : (PORTB & ~_BV(pin - 8));
+				DDRB |= _BV(pin - 8);
+			} else if (pin < 24) {
+				PORTC = value ? (PORTC | _BV(pin - 16)) : (PORTC & ~_BV(pin - 16));
+				DDRC |= _BV(pin - 16);
+			} else if (pin < 32) {
+				PORTD = value ? (PORTD | _BV(pin - 24)) : (PORTD & ~_BV(pin - 24));
+				DDRD |= _BV(pin - 24);
+			}
+		}
 		inline unsigned char read(unsigned char const pin) {
 			if (pin < 8) {
 			}
@@ -104,6 +130,26 @@ class GPIO {
 				}
 			}
 		}
+		inline void enable_int(unsigned char const pin) {
+			if (pin < 8) {
+			} else if (pin < 16) {
+				PCMSK0 |= _BV(pin - 8);
+			} else if (pin < 24) {
+				PCMSK1 |= _BV(pin - 16);
+			} else if (pin < 32) {
+				PCMSK2 |= _BV(pin - 24);
+			}
+		}
+		inline void disable_int(unsigned char const pin) {
+			if (pin < 8) {
+			} else if (pin < 16) {
+				PCMSK0 &= ~_BV(pin - 8);
+			} else if (pin < 24) {
+				PCMSK1 &= ~_BV(pin - 16);
+			} else if (pin < 32) {
+				PCMSK2 &= ~_BV(pin - 24);
+			}
+		}
 };
 
 extern GPIO gpio;
diff --git a/src/arch/arduino-nano/driver/gpio.cc b/src/arch/arduino-nano/driver/gpio.cc
index b1f9c63..707f2bd 100644
--- a/src/arch/arduino-nano/driver/gpio.cc
+++ b/src/arch/arduino-nano/driver/gpio.cc
@@ -1,4 +1,17 @@
 #include "driver/gpio.h"
 #include <avr/io.h>
+#include <avr/interrupt.h>
 
 GPIO gpio;
+
+ISR(PCINT0_vect)
+{
+}
+
+ISR(PCINT1_vect)
+{
+}
+
+ISR(PCINT2_vect)
+{
+}
-- 
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