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
|
/*
* Copyright (c) 2019 Analog Devices Inc.
*
* This file is part of libm2k
* (see http://www.github.com/analogdevicesinc/libm2k).
*
* This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <libm2k/m2k.hpp>
#include <libm2k/contextbuilder.hpp>
#include <libm2k/analog/m2kanalogin.hpp>
#include <libm2k/analog/m2kpowersupply.hpp>
#include <libm2k/tools/i2c.hpp>
#include <libm2k/tools/i2c_extra.hpp>
#include <iostream>
/*
* This example uses EVAL-ADT7420-PMDZ as a slave
* Hardware configuration:
* (ADALM2000) DIO_0 <---> Pin 1 (ADT7420) <---> 10 kilohms resistor <--- V+ (ADALM2000)
* (ADALM2000) DIO_1 <---> Pin 3 (ADT7420) <---> 10 kilohms resistor <--- V+ (ADALM2000)
* (ADALM2000) GND <---> Pin 5 (ADT7420)
* (ADALM2000) V+ ---> Pin 7 (ADT7420)
*/
float convertTemperature(uint8_t *data)
{
uint8_t msb_temp = data[0];
uint8_t lsb_temp = data[1];
uint16_t temp = 0;
float temperature = 0;
temp = ((uint16_t)msb_temp << 8u) + lsb_temp;
if(temp & 0x8000) {
/*! Negative temperature */
temperature = (float) ((int32_t) temp - 65536) / 128;
}
else {
/*! Positive temperature */
temperature = (float) temp / 128;
}
return temperature;
}
int main()
{
libm2k::context::M2k *context = libm2k::context::m2kOpen("ip:192.168.2.1");
if (!context) {
std::cout << "Connection Error: No ADALM2000 device available/connected to your PC.\n";
return -1;
}
std::cout << "Calibrating ADC . . .\n";
context->calibrateADC();
libm2k::analog::M2kPowerSupply *powerSupply = context->getPowerSupply();
powerSupply->enableChannel(0, true);
powerSupply->pushChannel(0, 3.3);
//m2k initial struct (included from i2c_extra header)
m2k_i2c_init m2KI2CInit;
m2KI2CInit.scl = 0;
m2KI2CInit.sda = 1;
m2KI2CInit.context = context;
i2c_init_param i2CInitParam;
i2CInitParam.max_speed_hz = 100000;
i2CInitParam.slave_address = 0x48;
i2CInitParam.extra = (void*)&m2KI2CInit;
i2c_desc *desc = nullptr;
i2c_init(&desc, &i2CInitParam);
std::cout << "Initiating I2C transfer . . .\n";
uint8_t data_write_config[] = {0x0B};
uint8_t data_read_config[] = {0};
//7-bit addressing and repeated start
i2c_write(desc, data_write_config, sizeof(data_write_config), i2c_general_call | i2c_repeated_start);
//only 7-bit addressing
i2c_read(desc, data_read_config, sizeof(data_read_config), i2c_general_call);
std::cout << "Reading the temperature . . .\n";
uint8_t data_write_temperature[] = {0};
uint8_t data_read_temperature[] = {0, 0};
//7-bit addressing and repeated start
i2c_write(desc, data_write_temperature, sizeof(data_write_temperature), i2c_general_call | i2c_repeated_start);
//only 7-bit addressing
i2c_read(desc, data_read_temperature, sizeof(data_read_temperature), i2c_general_call);
float temperature = convertTemperature(data_read_temperature);
std::cout << "Temperature: " << temperature << "\u2103\n";
i2c_remove(desc);
libm2k::context::contextClose(context, true);
return 0;
}
|
