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auto-plow / 00e5d64

A wheelchair motor-propelled battery-powered ESP32-driven remote control snow plow.

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630 Nov 2018 18:364a63c8cInclude Arduino core filesJoshua11790N

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1/*
2 wiring_digital.c - digital input and output functions
3 Part of Arduino - http://www.arduino.cc/
4
5 Copyright (c) 2005-2006 David A. Mellis
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General
18 Public License along with this library; if not, write to the
19 Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 Boston, MA 02111-1307 USA
21
22 Modified 28 September 2010 by Mark Sproul
23*/
24
25#define ARDUINO_MAIN
26#include "wiring_private.h"
27#include "pins_arduino.h"
28
29void pinMode(uint8_t pin, uint8_t mode)
30{
31 uint8_t bit = digitalPinToBitMask(pin);
32 uint8_t port = digitalPinToPort(pin);
33 volatile uint8_t *reg, *out;
34
35 if (port == NOT_A_PIN) return;
36
37 // JWS: can I let the optimizer do this?
38 reg = portModeRegister(port);
39 out = portOutputRegister(port);
40
41 if (mode == INPUT) {
42 uint8_t oldSREG = SREG;
43 cli();
44 *reg &= ~bit;
45 *out &= ~bit;
46 SREG = oldSREG;
47 } else if (mode == INPUT_PULLUP) {
48 uint8_t oldSREG = SREG;
49 cli();
50 *reg &= ~bit;
51 *out |= bit;
52 SREG = oldSREG;
53 } else {
54 uint8_t oldSREG = SREG;
55 cli();
56 *reg |= bit;
57 SREG = oldSREG;
58 }
59}
60
61// Forcing this inline keeps the callers from having to push their own stuff
62// on the stack. It is a good performance win and only takes 1 more byte per
63// user than calling. (It will take more bytes on the 168.)
64//
65// But shouldn't this be moved into pinMode? Seems silly to check and do on
66// each digitalread or write.
67//
68// Mark Sproul:
69// - Removed inline. Save 170 bytes on atmega1280
70// - changed to a switch statment; added 32 bytes but much easier to read and maintain.
71// - Added more #ifdefs, now compiles for atmega645
72//
73//static inline void turnOffPWM(uint8_t timer) __attribute__ ((always_inline));
74//static inline void turnOffPWM(uint8_t timer)
75static void turnOffPWM(uint8_t timer)
76{
77 switch (timer)
78 {
79 #if defined(TCCR1A) && defined(COM1A1)
80 case TIMER1A: cbi(TCCR1A, COM1A1); break;
81 #endif
82 #if defined(TCCR1A) && defined(COM1B1)
83 case TIMER1B: cbi(TCCR1A, COM1B1); break;
84 #endif
85 #if defined(TCCR1A) && defined(COM1C1)
86 case TIMER1C: cbi(TCCR1A, COM1C1); break;
87 #endif
88
89 #if defined(TCCR2) && defined(COM21)
90 case TIMER2: cbi(TCCR2, COM21); break;
91 #endif
92
93 #if defined(TCCR0A) && defined(COM0A1)
94 case TIMER0A: cbi(TCCR0A, COM0A1); break;
95 #endif
96
97 #if defined(TCCR0A) && defined(COM0B1)
98 case TIMER0B: cbi(TCCR0A, COM0B1); break;
99 #endif
100 #if defined(TCCR2A) && defined(COM2A1)
101 case TIMER2A: cbi(TCCR2A, COM2A1); break;
102 #endif
103 #if defined(TCCR2A) && defined(COM2B1)
104 case TIMER2B: cbi(TCCR2A, COM2B1); break;
105 #endif
106
107 #if defined(TCCR3A) && defined(COM3A1)
108 case TIMER3A: cbi(TCCR3A, COM3A1); break;
109 #endif
110 #if defined(TCCR3A) && defined(COM3B1)
111 case TIMER3B: cbi(TCCR3A, COM3B1); break;
112 #endif
113 #if defined(TCCR3A) && defined(COM3C1)
114 case TIMER3C: cbi(TCCR3A, COM3C1); break;
115 #endif
116
117 #if defined(TCCR4A) && defined(COM4A1)
118 case TIMER4A: cbi(TCCR4A, COM4A1); break;
119 #endif
120 #if defined(TCCR4A) && defined(COM4B1)
121 case TIMER4B: cbi(TCCR4A, COM4B1); break;
122 #endif
123 #if defined(TCCR4A) && defined(COM4C1)
124 case TIMER4C: cbi(TCCR4A, COM4C1); break;
125 #endif
126 #if defined(TCCR4C) && defined(COM4D1)
127 case TIMER4D: cbi(TCCR4C, COM4D1); break;
128 #endif
129
130 #if defined(TCCR5A)
131 case TIMER5A: cbi(TCCR5A, COM5A1); break;
132 case TIMER5B: cbi(TCCR5A, COM5B1); break;
133 case TIMER5C: cbi(TCCR5A, COM5C1); break;
134 #endif
135 }
136}
137
138void digitalWrite(uint8_t pin, uint8_t val)
139{
140 uint8_t timer = digitalPinToTimer(pin);
141 uint8_t bit = digitalPinToBitMask(pin);
142 uint8_t port = digitalPinToPort(pin);
143 volatile uint8_t *out;
144
145 if (port == NOT_A_PIN) return;
146
147 // If the pin that support PWM output, we need to turn it off
148 // before doing a digital write.
149 if (timer != NOT_ON_TIMER) turnOffPWM(timer);
150
151 out = portOutputRegister(port);
152
153 uint8_t oldSREG = SREG;
154 cli();
155
156 if (val == LOW) {
157 *out &= ~bit;
158 } else {
159 *out |= bit;
160 }
161
162 SREG = oldSREG;
163}
164
165int digitalRead(uint8_t pin)
166{
167 uint8_t timer = digitalPinToTimer(pin);
168 uint8_t bit = digitalPinToBitMask(pin);
169 uint8_t port = digitalPinToPort(pin);
170
171 if (port == NOT_A_PIN) return LOW;
172
173 // If the pin that support PWM output, we need to turn it off
174 // before getting a digital reading.
175 if (timer != NOT_ON_TIMER) turnOffPWM(timer);
176
177 if (*portInputRegister(port) & bit) return HIGH;
178 return LOW;
179}
180