1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright (c) 2007 empronix (http://www.empronix.com)
* Author: Benedikt Sauter <sauter@empronix.com>
* All rights reserved.
*
* Short descripton of file:
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the FH Augsburg nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES{} LOSS OF USE,
* DATA, OR PROFITS{} OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "common.h"
#include "protocol.h"
#include "adc.h"
void adc_parser(char *buf)
{
switch(buf[0])
{
case CMD_ADC_INIT_PIN:
adc_init_usb((int)buf[2]);
break;
case CMD_ADC_GET:
adc_get_usb((int)buf[2]);
break;
case CMD_ADC_REF:
adc_ref_usb((int)buf[2]);
break;
default:
answer[0]=buf[0];
answer[1]=RSP_UNKOWN_CMD;
answer[2]=0;
CommandAnswer(3);
}
}
int adc_init(int pin)
{
if (pin >= 33 && pin <= 40)
{
octopus.ports[pin] = PIN_AD;
switch(pin)
{
case 40: break;
case 39: break;
case 38: break;
case 37: break;
case 36: break;
case 35: break;
case 34: break;
case 33: break;
default:
return RSP_IMPOSSIBLE_PIN_CONFIG;
}
return RSP_OK;
}
return RSP_UNKOWN_PIN;
}
void adc_init_usb(int pin)
{
answer[0]=CMD_ADC_INIT_PIN;
answer[1]= (unsigned char)adc_init(pin);
answer[2]=0;
CommandAnswer(3);
}
void adc_get_usb(int pin)
{
uint16_t result;
//uint8_t result[2];
answer[0]=CMD_ADC_GET;
answer[1]=adc_get(pin,&result);
//result[0] = 0x77;
//result[1] = 0x88;
//answer[2]=(char)result[1]; //high
//answer[3]=(char)result[0]; //low
answer[2]=(char)(result>>8); //high
answer[3]=(char)(result); //low
CommandAnswer(4);
}
int adc_get(int pin, uint16_t *value)
{
*value = 0;
if (octopus.ports[pin] == PIN_AD)
{
switch (pin)
{
case 40: *value =_adc_read_channel(0); break;
case 39: *value =_adc_read_channel(1); break;
case 38: *value =_adc_read_channel(2); break;
case 37: *value =_adc_read_channel(3); break;
case 36: *value =_adc_read_channel(4); break;
case 35: *value =_adc_read_channel(5); break;
case 34: *value =_adc_read_channel(6); break;
case 33: *value =_adc_read_channel(7); break;
default:
return RSP_IMPOSSIBLE_PIN_CONFIG;
}
return RSP_OK;
}
else
{
return RSP_WRONG_PIN_CONFIG;
}
}
void adc_ref_usb(int ref)
{
answer[0]=CMD_ADC_REF;
answer[1]=adc_ref(ref);
CommandAnswer(2);
}
int adc_ref(int ref)
{
ADMUX = 0x00;
switch(ref){
case PARAM_ADC_AREF: break;
case PARAM_ADC_AVCC: ADMUX |= (1<<REFS0); break;
case PARAM_ADC_INTERNAL: ADMUX |= (1<<REFS1) | (1<<REFS0); break;
default:
return RSP_ERROR;
}
return RSP_OK;
}
uint16_t _adc_read_channel(int mux)
{
int i;
uint16_t result;
ADCSRA = (1<<ADEN) | (1<<ADPS1) | (1<<ADPS0); // Frequenzvorteiler
// setzen auf 8 (1) und ADC aktivieren (1)
//ADMUX |= (unsigned char)mux; // Kanal waehlen
ADMUX = (ADMUX & 0xF0) | (unsigned char) mux; // select channel
//ADMUX |= (1<<REFS1) | (1<<REFS0); // interne Referenzspannung nutzen
/* nach Aktivieren des ADC wird ein "Dummy-Readout" empfohlen, man liest
also einen Wert und verwirft diesen, um den ADC "warmlaufen zu lassen" */
ADCSRA |= (1<<ADSC); // eine ADC-Wandlung
while ( ADCSRA & (1<<ADSC) ) {
; // auf Abschluss der Konvertierung warten
}
result = ADCW; // ADCW muss einmal gelesen werden,
// sonst wird Ergebnis der n�chsten Wandlung
// nicht �bernommen.
/* Eigentliche Messung - Mittelwert aus 4 aufeinanderfolgenden Wandlungen */
result = 0;
for( i=0; i<4; i++ )
{
ADCSRA |= (1<<ADSC); // eine Wandlung "single conversion"
while ( ADCSRA & (1<<ADSC) ) {
; // auf Abschluss der Konvertierung warten
}
result += ADCW; // Wandlungsergebnisse aufaddieren
}
ADCSRA &= ~(1<<ADEN); // ADC deaktivieren (2)
result /= 4; // Summe durch vier teilen = arithm. Mittelwert
return result;
}
|
