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auto-plow / 6681ab8

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

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1/*
2 wiring_analog.c - analog input and output
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#include "wiring_private.h"
26#include "pins_arduino.h"
27
28uint8_t analog_reference = DEFAULT;
29
30void analogReference(uint8_t mode)
31{
32 // can't actually set the register here because the default setting
33 // will connect AVCC and the AREF pin, which would cause a short if
34 // there's something connected to AREF.
35 analog_reference = mode;
36}
37
38int analogRead(uint8_t pin)
39{
40 uint8_t low, high;
41
42#if defined(analogPinToChannel)
43#if defined(__AVR_ATmega32U4__)
44 if (pin >= 18) pin -= 18; // allow for channel or pin numbers
45#endif
46 pin = analogPinToChannel(pin);
47#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
48 if (pin >= 54) pin -= 54; // allow for channel or pin numbers
49#elif defined(__AVR_ATmega32U4__)
50 if (pin >= 18) pin -= 18; // allow for channel or pin numbers
51#elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__)
52 if (pin >= 24) pin -= 24; // allow for channel or pin numbers
53#else
54 if (pin >= 14) pin -= 14; // allow for channel or pin numbers
55#endif
56
57#if defined(ADCSRB) && defined(MUX5)
58 // the MUX5 bit of ADCSRB selects whether we're reading from channels
59 // 0 to 7 (MUX5 low) or 8 to 15 (MUX5 high).
60 ADCSRB = (ADCSRB & ~(1 << MUX5)) | (((pin >> 3) & 0x01) << MUX5);
61#endif
62
63 // set the analog reference (high two bits of ADMUX) and select the
64 // channel (low 4 bits). this also sets ADLAR (left-adjust result)
65 // to 0 (the default).
66#if defined(ADMUX)
67#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
68 ADMUX = (analog_reference << 4) | (pin & 0x07);
69#else
70 ADMUX = (analog_reference << 6) | (pin & 0x07);
71#endif
72#endif
73
74 // without a delay, we seem to read from the wrong channel
75 //delay(1);
76
77#if defined(ADCSRA) && defined(ADCL)
78 // start the conversion
79 sbi(ADCSRA, ADSC);
80
81 // ADSC is cleared when the conversion finishes
82 while (bit_is_set(ADCSRA, ADSC));
83
84 // we have to read ADCL first; doing so locks both ADCL
85 // and ADCH until ADCH is read. reading ADCL second would
86 // cause the results of each conversion to be discarded,
87 // as ADCL and ADCH would be locked when it completed.
88 low = ADCL;
89 high = ADCH;
90#else
91 // we dont have an ADC, return 0
92 low = 0;
93 high = 0;
94#endif
95
96 // combine the two bytes
97 return (high << 8) | low;
98}
99
100// Right now, PWM output only works on the pins with
101// hardware support. These are defined in the appropriate
102// pins_*.c file. For the rest of the pins, we default
103// to digital output.
104void analogWrite(uint8_t pin, int val)
105{
106 // We need to make sure the PWM output is enabled for those pins
107 // that support it, as we turn it off when digitally reading or
108 // writing with them. Also, make sure the pin is in output mode
109 // for consistenty with Wiring, which doesn't require a pinMode
110 // call for the analog output pins.
111 pinMode(pin, OUTPUT);
112 if (val == 0)
113 {
114 digitalWrite(pin, LOW);
115 }
116 else if (val == 255)
117 {
118 digitalWrite(pin, HIGH);
119 }
120 else
121 {
122 switch(digitalPinToTimer(pin))
123 {
124 // XXX fix needed for atmega8
125 #if defined(TCCR0) && defined(COM00) && !defined(__AVR_ATmega8__)
126 case TIMER0A:
127 // connect pwm to pin on timer 0
128 sbi(TCCR0, COM00);
129 OCR0 = val; // set pwm duty
130 break;
131 #endif
132
133 #if defined(TCCR0A) && defined(COM0A1)
134 case TIMER0A:
135 // connect pwm to pin on timer 0, channel A
136 sbi(TCCR0A, COM0A1);
137 OCR0A = val; // set pwm duty
138 break;
139 #endif
140
141 #if defined(TCCR0A) && defined(COM0B1)
142 case TIMER0B:
143 // connect pwm to pin on timer 0, channel B
144 sbi(TCCR0A, COM0B1);
145 OCR0B = val; // set pwm duty
146 break;
147 #endif
148
149 #if defined(TCCR1A) && defined(COM1A1)
150 case TIMER1A:
151 // connect pwm to pin on timer 1, channel A
152 sbi(TCCR1A, COM1A1);
153 OCR1A = val; // set pwm duty
154 break;
155 #endif
156
157 #if defined(TCCR1A) && defined(COM1B1)
158 case TIMER1B:
159 // connect pwm to pin on timer 1, channel B
160 sbi(TCCR1A, COM1B1);
161 OCR1B = val; // set pwm duty
162 break;
163 #endif
164
165 #if defined(TCCR1A) && defined(COM1C1)
166 case TIMER1C:
167 // connect pwm to pin on timer 1, channel B
168 sbi(TCCR1A, COM1C1);
169 OCR1C = val; // set pwm duty
170 break;
171 #endif
172
173 #if defined(TCCR2) && defined(COM21)
174 case TIMER2:
175 // connect pwm to pin on timer 2
176 sbi(TCCR2, COM21);
177 OCR2 = val; // set pwm duty
178 break;
179 #endif
180
181 #if defined(TCCR2A) && defined(COM2A1)
182 case TIMER2A:
183 // connect pwm to pin on timer 2, channel A
184 sbi(TCCR2A, COM2A1);
185 OCR2A = val; // set pwm duty
186 break;
187 #endif
188
189 #if defined(TCCR2A) && defined(COM2B1)
190 case TIMER2B:
191 // connect pwm to pin on timer 2, channel B
192 sbi(TCCR2A, COM2B1);
193 OCR2B = val; // set pwm duty
194 break;
195 #endif
196
197 #if defined(TCCR3A) && defined(COM3A1)
198 case TIMER3A:
199 // connect pwm to pin on timer 3, channel A
200 sbi(TCCR3A, COM3A1);
201 OCR3A = val; // set pwm duty
202 break;
203 #endif
204
205 #if defined(TCCR3A) && defined(COM3B1)
206 case TIMER3B:
207 // connect pwm to pin on timer 3, channel B
208 sbi(TCCR3A, COM3B1);
209 OCR3B = val; // set pwm duty
210 break;
211 #endif
212
213 #if defined(TCCR3A) && defined(COM3C1)
214 case TIMER3C:
215 // connect pwm to pin on timer 3, channel C
216 sbi(TCCR3A, COM3C1);
217 OCR3C = val; // set pwm duty
218 break;
219 #endif
220
221 #if defined(TCCR4A)
222 case TIMER4A:
223 //connect pwm to pin on timer 4, channel A
224 sbi(TCCR4A, COM4A1);
225 #if defined(COM4A0) // only used on 32U4
226 cbi(TCCR4A, COM4A0);
227 #endif
228 OCR4A = val; // set pwm duty
229 break;
230 #endif
231
232 #if defined(TCCR4A) && defined(COM4B1)
233 case TIMER4B:
234 // connect pwm to pin on timer 4, channel B
235 sbi(TCCR4A, COM4B1);
236 OCR4B = val; // set pwm duty
237 break;
238 #endif
239
240 #if defined(TCCR4A) && defined(COM4C1)
241 case TIMER4C:
242 // connect pwm to pin on timer 4, channel C
243 sbi(TCCR4A, COM4C1);
244 OCR4C = val; // set pwm duty
245 break;
246 #endif
247
248 #if defined(TCCR4C) && defined(COM4D1)
249 case TIMER4D:
250 // connect pwm to pin on timer 4, channel D
251 sbi(TCCR4C, COM4D1);
252 #if defined(COM4D0) // only used on 32U4
253 cbi(TCCR4C, COM4D0);
254 #endif
255 OCR4D = val; // set pwm duty
256 break;
257 #endif
258
259
260 #if defined(TCCR5A) && defined(COM5A1)
261 case TIMER5A:
262 // connect pwm to pin on timer 5, channel A
263 sbi(TCCR5A, COM5A1);
264 OCR5A = val; // set pwm duty
265 break;
266 #endif
267
268 #if defined(TCCR5A) && defined(COM5B1)
269 case TIMER5B:
270 // connect pwm to pin on timer 5, channel B
271 sbi(TCCR5A, COM5B1);
272 OCR5B = val; // set pwm duty
273 break;
274 #endif
275
276 #if defined(TCCR5A) && defined(COM5C1)
277 case TIMER5C:
278 // connect pwm to pin on timer 5, channel C
279 sbi(TCCR5A, COM5C1);
280 OCR5C = val; // set pwm duty
281 break;
282 #endif
283
284 case NOT_ON_TIMER:
285 default:
286 if (val < 128) {
287 digitalWrite(pin, LOW);
288 } else {
289 digitalWrite(pin, HIGH);
290 }
291 }
292 }
293}
294
295